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Lepton-Photon 2025
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Monona Terrace
Monona Terrace
Madison, WI
Sridhara Dasu
(University of Wisconsin Madison (US))
Description
32nd International Symposium on Lepton Photon Interactions at High Energies
To be held at the Frank Lloyd Wright designed Monona Terrace Convention Center in the heart of Madison, Wisconsin, USA.
For Registration, Visas, etc., please access: Conference Home
The LP-2025 symposium will feature a broad range of topics of interest to the particle physics, cosmology and particle astro-physics communities. Presentations will include latest experimental results from current experiments, R&D towards future facilities and theoretical developments. There will be plenary talks providing summaries of the state of the field, typically in the morning, detailed reports in the parallel talks and topical results in poster sessions.
Zoom Room for Plenary: Lecture Hall
The roofTOP celebration: Photographs
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09:00
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10:30
Plenary: Opening Session Lecture Hall
Lecture Hall
Monona Terrace
Convener: Sridhara Dasu (University of Wisconsin Madison (US))-
09:00
Welcome to Madison 10mSpeaker: Gloria Mari Beffa (UW-Madison)
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09:10
Sponsor Welcome & IUPAP Report 20mSpeaker: Marcelo Gameiro Munhoz (Universidade de Sao Paulo (USP) (BR))
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09:30
LHC Status and HL-LHC Readiness 30m
- The present LHC operation of Run 3, both for protons/ions and special
physics runs - Remaining LHC program in Run 3, until the start of long shutdown 3 in
June 2026 - Timeline of HL-LHC installation and re-start of operation
- Readiness of key components for installation during LS3 (magnets, sc
links, crab-cavities, …) - Progress of installation of technical infrastructure
- Commissioning plans and performance predictions in the HL era (as of
2030)
Speaker: Markus Zerlauth (CERN) - The present LHC operation of Run 3, both for protons/ions and special
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10:00
Precision and rare electroweak processes 30mSpeaker: Jeffrey Berryhill (Fermi National Accelerator Lab. (US))
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11:00
Morning Break 30m
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12:40
Parallel: Accelerator Technologies 1 Room I
Room I
Monona Terrace
Convener: Stephen Gourlay-
11:00
A path towards at 10 TeV Muon Collider 20m
Muons are elementary particles and all their energy is available in a collision, with far cleaner events relative to those produced by the smash of a composite particle like the proton. Muons are also heavy, meaning that they are less prone to synchrotron radiation that effectively limits the energies of circular electron-positron colliders. This raises the prospect that a Muon Collider could exceed the direct energy reach of the Large Hadron Collider, while achieving unprecedented precision measurements of Standard Model processes. In this article we summarize the work and progress achieved so far towards such a machine. We also identify a set of further studies needed and describe a plan to bring these ideas to maturity so that to make a Muon Collider a reality on the timescale of approximately two decades.
Speaker: Sergo Jindariani (Fermilab and UW-Madison) -
11:20
The 10 TeV Wakefield Collider Design Study 20m
The 10 TeV Wakefield Collider Design Study responds to the P5 Report's call for the ``delivery of an end-to-end design concept, including cost scales, with self-consistent parameters throughout." The Design Study leverages recent experimental and theoretical progress that are the result of a vigorous R\&D program. Wakefield Accelerators provide ultra-high accelerating gradients which enables an upgrade path to extend the reach of Linear Collider Higgs Factories from the electroweak scale to the energy frontier. Here, we describe the organization of the Design Study including timeline and deliverables, and we detail the requirements and challenges on the path to a 10 TeV Wakefield Collider.
Speaker: Jens Osterhoff (Berkeley Lab) -
11:40
The Cool Copper Collider: An Advanced Concept for a Future e+e- Higgs Factory 20m
A lepton-collider Higgs factory, to precisely measure the couplings of the Higgs boson to other particles, followed by a higher energy run to measure the Higgs self-coupling, is widely recognized as a primary focus of modern particle physics. In this talk, we will present the study of a new concept for a high gradient, high power accelerator with beam characteristics suitable to study the Higgs boson, the Cool Copper Collider (C3), with the goal of minimizing the capital and operating costs. C3 is based on the latest advances in rf accelerator technology and utilizes optimized cavity geometries, novel rf distribution, and operation at cryogenic temperatures to allow the linear accelerator to achieve high accelerating gradients while maintaining the overall system efficiency. We will present the latest demonstrated performance of prototype accelerators and highlight the future development path for C3.
Speaker: Emilio Nanni -
12:00
Recent Progress on Cold Copper Technology 20m
Cold copper accelerating technology represents one of the new frontiers in normal-conducting RF research. It has enabled accelerating structures to reach record high accelerating gradients while providing overall better efficiency. In this talk we will present the latest results on cold-copper high gradient R&D activities including recent results on single-cell and meter-scale structure testing. On going work developing the integrated cryomodules for supporting and aligning structures in linear accelerators will also be presented. Efforts to utilize cold-copper technology for injectors and future colliders will also be summarized.
Speaker: Ankur Dhar (SLAC National Accelerator Lab) -
12:20
Precise luminosity measurement at CMS 20m
Precise luminosity measurement is essential for the success of the CMS physics program. In this talk, we present the latest results for luminosity measurements from the CMS experiment, including data from Run 2 and Run 3 for both pp and heavy ion collisions. We focus on recent methods to reduce systematic uncertainties that affect the absolute luminosity scale obtained from van der Meer scans, as well as techniques to correct instrumental effects influencing the stability and linearity of luminometers. Additionally, we discuss the use of dimuon event counts as a standard candle for comparing luminosity measurements.
Speaker: Chris Palmer (University of Maryland (US))
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Parallel: BSM Higgses Room F
Room F
Monona Terrace
Convener: Abdollah Mohammadi (University of Wisconsin Madison (US))-
11:00
Search for rare decay of SM Higgs to light scalars in the CMS experiment [Zoom] 20m
An overview of selected searches where the SM Higgs boson decays to a pair of light scalars performed with p-p collisions data recorded during Run 2 by the CMS detector at √s = 13 TeV. Analyses with b quarks and/or leptons in the final state are highlighted.
Speaker: Anagha Aravind (University of Wisconsin Madison (US)) -
11:20
Search for a doubly charged Higgs boson produced via vector-boson fusion using the ATLAS detector 20m
A new search is presented for the production of a doubly charged Higgs boson via vector-boson fusion (VBF) with the ATLAS detector at the Large Hadron Collider. The doubly charged Higgs decays into same-sign W boson pairs, where only fully leptonic (electrons and muons) decays of the W bosons are considered. Events are required to contain two forward jets, two same-sign leptons, and missing energy. This search utilizes the full proton-proton collision dataset collected during Run 2 at center-of-mass energy 13 TeV and a partial dataset collected during Run 3 in 2022-2023 at center-of-mass energy 13.6 TeV. These correspond to integrated luminosities of 140 fb^−1 and 56.3 fb^−1, respectively. The search follows up on a Run 2 search that had an intriguing excess around 450 GeV. Both a selection-based and a boosted decision tree analysis approach are described, with each optimized to provide enhanced sensitivity over the parameter space of the Georgi-Machacek (GM) model. Results are interpreted in the context of the GM model
Speaker: Thomas Gosart (University of Pennsylvania (US)) -
11:40
Searches for additional Higgs bosons (high & low mass) at CMS 20m
We present searches from the CMS experiment, performed with data collected during LHC Run 2 at a centre-of-mass energy of 13 TeV, for additional Higgs bosons. A variety of states are searched for, at masses both above and below 125 GeV.
FilesSpeaker: Axel Newton Buchot Perraguin (University of Alabama (US)) -
12:00
Searches for Beyond Standard Model Higgs boson decays (including low mass resonances) 20m
The discovery of the Higgs boson with the mass of about 125 GeV completed the particle content predicted by the Standard Model. Even though this model is well established and consistent with many measurements, it is not capable of explaining some observations by itself. Many extensions of the Standard Model addressing such shortcomings introduce beyond-the-Standard-Model couplings to the Higgs boson. In this talk, the latest searches in the Higgs sector are reported, with emphasis on the results obtained with the full LHC Run 2 dataset at 13 TeV and including a series of searches for low-mass resonances in merged or boosted topologies.
Speaker: Sijing Zhang (L2IT/Université de Toulouse, CNRS/IN2P3 (FR)) -
12:20
Recent results on searches with boosted Higgs at CMS 20m
A core part of the LHC program is the study of the Higgs boson. Since its discovery, extensive effort in CMS has been devoted to precision measurements of its properties and couplings. At high transverse momentum, the Higgs boson can help probe beyond the standard model (BSM) theories.
This talk will cover the recent results on searches with boosted Higgs at CMS made by the CMS Collaboration: 1. HIG-21-020: boosted H->bb produced via VBF or ggF 2. HIG-21-017: boosted H->tau tau 3. HIG-21-016: boosted H->aa->4photons (very low mass) 4. HIG-23-011: boosted H(ZZ/bb)+gamma production 5. HIG-23-012: boosted HH(bbWW) hadronic 6. HIG-24-008: boosted H(WW) semi-leptonic and fully-hadronic final states + differential cross section measurement 7. HIG-24-017: boosted VH production in the H to bb decay mode (The last two entries are not yet published but are targeting Moriond EWK/QCD 2025)
Speaker: Raghav Kansal (Caltech / Fermilab)
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Parallel: Charged Lepton Flavor Violation 1 Room J
Room J
Monona Terrace
Convener: Jure Zupan (University of Cincinnati)-
11:00
The Mu2e experiment: Overview and current status 20m
The Mu2e experiment is a charged lepton flavor violation experiment located at Fermilab, and will search for neutrinoless muon-to-electron conversion in the presence of an aluminum nuclear field. If found, muon-to-electron conversion would unequivocally become evidence of new physics beyond the Standard Model. Mu2e aims to constrain the current signal experimental limits by four orders of magnitude. This presentation will provide an overview of the Mu2e experiment as well as a report of the current status, including the completion of the detector construction prior to the first experimental run, scheduled for 2027.
Speaker: Gonzalo Diaz (Fermi National Accelerator Laboratory) -
11:20
LFV decays of bosons at CMS 20m
Lepton flavor number violating decays are forbidden by the Standard Model, but may be possible in several of its extensions. We present the current searches of electroweak and Higgs boson decays characterized by a signature that violates the conservation of the lepton flavor number. These signature involve electron, muons and hadronically decaying taus in the final state, and are performed using the run-2 dataset collected by CMS at the center-of-mass energy of 13 TeV.
Speaker: Colin Jessop (Notre Dame) -
11:40
Charged lepton flavor violation searches at BESIII 20mSpeaker: Tianzi Song (Sun Yat-Sen University (CN))
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12:00
Search for the Lepton Flavour Violating decays $\Upsilon(2{\mathrm{S}}) \to e^{\pm}\mu^{\mp}$ and $\Upsilon(3{\mathrm{S}}) \to e^{\pm}\mu^{\mp}$ 20m
Charged lepton flavour violating processes are unobservable in the standard model, but they are predicted to be enhanced in several new physics extensions. We present the results of a search for $\Upsilon(2{\mathrm{S}})$ and $\Upsilon(3{\mathrm{S}})$ decays to $e^{\pm}\mu^{\mp}$ decays.
The search was conducted using data samples consisting of 99 million $\Upsilon(2{\mathrm{S}})$ and 122 million $\Upsilon(3{\mathrm{S}})$ mesons, collected at center-of-mass energies of 10.23 and 10.36~GeV, respectively, by the BABAR detector at the SLAC PEP-II $e^+e^-$ colliderSpeaker: Prof. Hossain Ahmed (St. Francis Xavier University) -
12:20
Probing Lepton Flavor Violation at Future Electron-Positron Colliders 20m
The production of τμ pairs in electron-positron collisions offers a powerful probe of lepton flavor violation. In this work, we calculate the e+e−→τμ cross section within the framework of the Standard Model Effective Field Theory, allowing for arbitrary e+e− beam polarizations. We then estimate the sensitivities of proposed future linear colliders, ILC and CLIC, to effective lepton flavor-violating interactions. The high center-of-mass energies achievable at these machines provide particularly strong sensitivity to four-fermion operators. Furthermore, the polarization of the e+e− beams enables novel tests of the chirality structure of these interactions. We find that our projected sensitivities not only complement but in certain scenarios surpass those achievable with low-energy tau decay measurements at Belle~II.
Speaker: Pankaj Munbodh (University of California Santa Cruz)
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Parallel: Dark Sectors (Direct/Indirect) 1 Room KLOP
Room KLOP
Monona Terrace
Convener: Theresa Fruth (University of Sydney)-
11:00
Probing benchmark models of hidden-sector dark matter with DAMIC-M 20m
The DAMIC-M (DArk Matter In CCDs at Modane) experiment searches for sub-GeV dark matter particles using electron-counting ''skipper'' charge-coupled devices (CCDs). Recent results from two prototype detector modules deployed in a test stand at the Modane Underground Laboratory (LSM) in France already demonstrate world-leading sensitivity, probing benchmark models of hidden-sector dark matter over a wide range of masses for the first time. We report on the latest progress in the construction of the DAMIC-M detector, scheduled for commissioning in LSM later in 2025. With its 208-CCD array, for a target mass of 700 grams of silicon, DAMIC-M will further advance the search for sub-GeV dark matter by several orders of magnitude in sensitivity.
Speaker: Heng Lin (Johns Hopkins University) -
11:20
Searching for Dark Matter Annihilation in the Sun with the IceCube Upgrade 20m
The upcoming IceCube Upgrade will provide unprecedented sensitivity to dark matter particles that accumulate and annihilate in the core of the Sun. In this talk, I will present our recent study showing that the upgrade will enable tests of parameter space beyond the reach of existing direct detection experiments. This improvement applies in particular to dark matter candidates with spin-dependent couplings to nuclei that annihilate significantly to tau leptons or neutrinos. After discussing the expected sensitivity of the IceCube Upgrade, I will introduce two classes of dark matter models that could be targeted by this experiment.
Speaker: Fabrizio Vassallo (University of Wisconsin–Madison) -
11:40
A Dual to Ordinary Matter Yielding Composite Flavored Scalar Dark Matter 20m
We discuss a Dual to ordinary matter that yields composite self-interacting dark matter. For each elementary particle inn the SM, the Dual:
1. Changes spin by ½, i.e. a SUSY-lite;
2. U(1): Changes electric charge e to magnetic charge g with g=e/; to avoid non-integer magnetic charge the up and down squark sectors have g=+3g and -6g, the charged sleptons and Wino are charged 2g;
3. SU(2)L => SU(2)R – L/R handedness is interchanged along with weak charges. The Z cannot decay to pairs of dual particles, like sneutrinos, by handedness constraints.
4. SU(3): Changes chromoelectric charge to chromomagnetic charge, with chromocharges reciprocal, similar to electric/magnetic duality– no triple-gluino vertex, and an effectives for chromomagnetic squarks is weak and runs oppositely; pseudoscalar squarks interact by exchange of gluino-loops yielding a weak Yukawa interaction.
5. Flavors remain the same in the Dual.
6. Up to tree level and field energy corrections, the dual masses are the same as the SM; in effect, flavor and mass describe the same property with respect to the Higgs.
7. The masses of the Higgs and Higgsino are stabilized, as the top and magnetic scalar stop have the same masses. Similarly, there is no need for R-parity, as there are no diagrams where magnetically charged squarks can lead to proton decay.
Consequences: the charged dual particles are confined as magnetically and chromomagnetically stable neutral shadrons, or slepton-pair monopoliums with long lifetimes. When pair-produced from the SM, monopoles dress themselves to neutral monopolium in analogous ways to chromoelectric confinement and escape, enabled by the low mass squarks and sleptons, like the low mass squarks. We discuss how present limits on monopoles evade detection when pair-produced, and the consequences of CP violation on pair-production of magnetic scalars. Because the down/up sector squarks charges are -6g/+3g and Wino charge 2g, the weak magnetic current is shut off as 2g cannot change +3g to -6g, leading to 6 stable neutral flavored smesons and to 27 stable neutral flavored sbaryons, with hundreds of other multiple component neutral dual sector configurations, resulting in a surprisingly large spectrum of dark matter composite light neutral flavored particles. It is reasonable that the strength of magnetic forces would create much more dark magnetic matter than electric matter in the early epoch. The photon is in effect divided into 2 classes: photons emitted from electric particles couple to magnetic particles as g, whereas photons emitted from magnetic particles couple as e, which interact with SM matter weakly for photon energies less than ~10 MeV in the lab frame, effectively dark photons. Such photons with ~few eV energies would be largely invisible in cameras, for example from dim galaxies, and at 10’s MeV’s in calorimeters or satellite x-ray detetectors. Considering the magnetic binding energies ~ TeV, resolving the charges in stable neutral flavored monopoliums requires very large energies, such as associated with cosmic rays. Production cross-sections for stable neutral monopoliums from electric matter is discussed as is magnetic matter in the cosmos. Hints of this dual in existing accelerator, cosmic ray data, in present anomalies and neutrino oscillations, and consequences for massless photinos are presented.Speaker: Prof. David Winn (Fairfield University) -
12:00
Searches for physics beyond the Standard Model with the Short-Baseline Near Detector 20m
The Short-Baseline Near Detector (SBND) is a 112-ton liquid argon time projection chamber 110 m away from the Booster Neutrino Beam (BNB) target at Fermilab (Illinois, USA). The close location to the BNB origin makes the experiment sensitive to physics beyond the Standard Model (BSM) produced in the beam. Thanks to its advanced scintillation light detection system, a timing resolution at the nanosecond level further boosts the experiment capabilities. In this talk, we present the status and expected sensitivity to new BSM particles produced in the decay of mesons and in proton-target interactions in the BNB.
Speaker: Keng Lin -
12:20
Recent Progress of DarkSHINE R&D 20m
Sci. China-Phys. Mech. Astron., 66(1): 211062 (2023)
arXiv:2411.09345 [Conceptual Design Report]
Nucl. Sci. Tech.35,148(2024)
Nucl. Sci. Tech.35,201(2024)
Nucl. Sci. Tech. 36,41(2025)
arXiv:2407.20723 [JINST peer-reviewing]
arXiv:2401.15477 [10.1007/978-981-97-0065-3_19]
PoS ICHEP2024 (2025) 728 [DOI:10.22323/1.476.0728]
DOI:10.5281/zenodo.8373963
DOI:10.1016/j.nuclphysbps.2024.06.019
DOI:10.1016/j.nuclphysbps.2024.07.008
DOI:10.1016/j.nuclphysbps.2024.06.014
DOI:10.1016/j.nuclphysbps.2024.07.003DarkSHINE is a fixed-target experiment initiative to search for light Dark Matter and mediators at SHINE (Shanghai high repetition rate XFEL and extreme light facility, being the 1$^{st}$ hard X-ray FEL in China) under construction targeting completion in 2025/2026. DarkSHINE aims to search for the new mediator, Dark Photon, bridging the Dark sector and the ordinary matter. In this work and presentation, we present the idea of this new project and 1st prospective study in search for Dark Photon decaying into light dark matter as well as the very recent technical R&D progresses. It also provides the opportunity to incorporate broader scope of BSM search ideas such as ALP / Anomalous Muonium / LLP / etc. and electron/photon/neutrino-nuclear interaction product measurements, utilizing the fixed-target experiment of this type. Also in the future, DarkSHINE experiment has the great potential to be upgraded into positron beam mode and search for Dark Photon via more production channels through s/t-channel annihilations. Last but not least, DarkSHINE will likely provide cross-reference experimental DATA together with future LDMX experiment, the continued NA64 experiment, etc. to become part of the global efforts for accelerator based Dark Matter searches.
Speaker: Haijun Yang (Shanghai Jiao Tong University (CN))
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Parallel: Neutrino Physics 1 Room H
Room H
Monona Terrace
Convener: Prof. Brian James Rebel (University of Wisconsin-Madison)-
11:00
Beyond Standard Model Neutrino Oscillation Results from NOvA Experiment 20m
NOvA is long-baseline neutrino oscillation experiment with functionally identical liquid scintillator detectors separated by a long-baseline, in the NuMI neutrino beam at Fermilab. NOvA probes not only the standard three flavor scenario, but also exotic oscillations scenarios including sterile neutrinos and non-standard interactions. The 3+1 sterile oscillation model is an extension of the standard three flavor oscillation paradigm which includes an extra neutrino mass and flavor eigenstate, where the new flavor state does not interact with the weak force. NSI are an extension of the neutrino matter effect, including off-diagonal terms, which augment the phenomenology of the three flavor oscillation paradigm. This talk summarizes recent beyond-the-Standard-Model neutrino oscillation results from NOvA, including a search 3+1 sterile oscillations that utilizes charged current muon neutrino and neutral current selections in a two-detector fit procedure to place robust limits on multiple sterile mixing parameters, and a search for NSI utilizing charged current muon and electron neutrino samples in both neutrino and antineutrino beam modes.
Speaker: Dr ADAM LISTER -
11:20
Searches for physics beyond the Standard Model with the MicroBooNE experiment 20m
MicroBooNE is an 85 tonne active mass liquid argon time projection chamber (LArTPC) at Fermilab. The detector, which has an excellent calorimetric, spatial and energy resolution, has collected beam data from two different beamlines between 2015 and 2020, as well as cosmic ray data when no neutrino beam was running. These characteristics make MicroBooNE a powerful detector not just to explore neutrino physics, but also for Beyond the Standard Model (BSM) physics. Additionally, MicroBooNE is investigating the observed low energy excess (LEE) of single electromagnetic shower events reported by the MiniBooNE experiment with various searches across a number of channels the anomalous excess may originate in. This talk will discuss various newly published BSM and LEE search results as well as explore future MicroBooNE searches.
Speaker: Diego Andrade (Illinois Institute of Technology) -
11:40
Reconstruction of Tau Neutrinos in LArTPC Detectors 20m
Our understanding of three-flavor neutrino oscillations has undergone significant improvement. However, most progress has come from studying $\nu_e$ and $\nu_\mu$ while the $\nu_\tau$ remains the least explored particle in the Standard Model. The Deep Underground Neutrino Experiment (DUNE), a next-generation long-baseline neutrino experiment under construction, is designed to address this gap.
DUNE will deploy two high-resolution detectors exposed to the world's most intense neutrino beam: the Near Detector (ND) at Fermilab and the Far Detector (FD), 1,300 km away at the Sanford Underground Research Facility in South Dakota. With liquid argon time projection chamber (LArTPC) technology, DUNE's LArTPC detector will provide high statistics and excellent resolution capabilities, allowing us to make precision studies of oscillation parameters, search for CP violation in the lepton sector, test interaction models, and study phenomena that have, until now, seemed too complex to measure, like $\nu_\tau$ detection and therefore, provide the completion of the 3-flavor neutrino paradigm. $\nu_\tau$ data can impact a broad spectrum of open questions; among these include searching for non-standard neutrino interactions, constraining the unitarity of the PMNS matrix, and the unmeasured F₄ and F₅ structure functions for neutrino interactions.
The DUNE FD, is also ideally suited to collect atmospheric $\nu_\tau$ . These events predominantly occur near the first atmospheric oscillation maximum and at a rate of ~1 CC-$\nu_\tau$ per kton-year. This atmospheric sample will provide a valuable complement to the beam data, enhancing sensitivity to three-flavor parameters and beyond the Standard Model scenarios.
To address all these questions, a key factor is to get a reliable event reconstruction, which is challenging. For this, we apply machine learning techniques. In the context of the DUNE FD, I will present NuGraph, a graph neural network (GNN) that models detector hits as nodes linked by spatial and temporal edges for classification and event reconstruction for LArTPC detectors. I will also present a review of the significance of $\nu_\tau$ physics.
Speaker: Barbara Yaeggy Alvarez -
12:00
First Measurement of Neutrino Interaction Cross Sections with FASER 20m
The FASER experiment at the LHC is designed to search for light, weakly-coupled new particles, and to study high-energy neutrinos. The experiment has been running since 2022, and has collected nearly 200/fb of pp collision data. FASER has released several neutrino results including the first observation of electron and muon neutrinos at a particle collider, the first measurement of the muon and electron neutrino interaction cross sections in the TeV energy range, and the first differential measurement with muon neutrinos and anti-neutrinos. This talk will summarise the FASER experiment, the neutrino results, and discuss future prospects for FASER neutrino results.
Speaker: Yuxiao Wang (Tsinghua University (CN)) -
12:20
Correlating Neutrino magnetic moment and inert doublet dark matter in a radiative seesaw scenario 20m
We illustrate neutrino mass and magnetic moment along with dark matter phenomenology in a Type-III radiative seesaw scenario. To achieve this, we extend the Standard Model with three vector-like fermion triplets and two inert scalar doublets, which can provide a suitable framework for studying the above phenomenological aspects. The inert scalars contribute to the total relic density of dark matter in the universe. The neutrino aspects are realized at one-loop level with magnetic moment obtained through charged scalars, while neutrino mass gets contribution from charged and neutral scalars. Taking inert scalar upto 2 TeV and triplet fermion mass in a few TeV range, we obtain a common parameter space, compatible with experimental limits associated with both neutrino and dark matter sectors. Finally, we demonstrate that the model is able to provide neutrino magnetic moments in a wide range from $10^{-12}\mu_B$ to $10^{-10}\mu_B$, meeting the bounds of various experiments such as Super-K, TEXONO, Borexino and XENONnT.
Speaker: Rukmani Mohanta
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Parallel: Theory 1 Room E
Room E
Monona Terrace
Convener: Peisi Huang-
11:00
Thermal corrections to dark matter annihilation cross sections [Zoom] 20m
Infra-red corrections are known to be more acute in thermal field theories than at zero temperature. We use the generalised approach of Grammer and Yennie to show that the cancellation of IR divergences occurs, as in the case of zero temperature field theory, between real and virtual contributions to the cross section, order by order, to all orders in perturbation theory. We use this technique to calculate the NLO thermal cross sections to dark matter annhilation cross sections in a simple manner. While computing the ${\cal{O}(T^2)$ corrections at NLO, we find that the soft IR divergences cancel straightforwardly, but the case of the collinear divergences is more subtle.
Speaker: D Indumathi (The Institute of Mathematical Sciences, Chennai) -
11:20
A theory of quark and lepton compositeness 20m
Are the electron, the neutrinos or the quarks elementary particles, or do they have some substructure? Particle physics experiments have shown that if such substructure exists, its scale must be smaller than about 10^{-18} cm. I will present a theoretical model in which the leptons and the quarks are bound states of a new strongly-coupled interaction, and then I will discuss some tests of the model in future experiments.
Speaker: Bogdan Dobrescu -
11:40
Towards AI-assisted Neutrino Flavor Theory Design 20m
Particle physics theories, such as those which explain neutrino flavor mixing, arise from a vast landscape of model-building possibilities. A model's construction typically relies on the intuition of theorists. It also requires considerable effort to identify appropriate symmetry groups, assign field representations, and extract predictions for comparison with experimental data. In this talk, I will discuss a new strategy ro construct a model. We developed an Autonomous Model Builder (AMBer), a framework in which a reinforcement learning agent interacts with a streamlined physics software pipeline to search these spaces efficiently. AMBer selects symmetry groups, particle content, and group representation assignments to construct viable models while minimizing the number of free parameters introduced. We validate our approach in well-studied regions of theory space and extend the exploration to a novel, previously unexamined symmetry group. While demonstrated in the context of neutrino flavor theories, this approach of reinforcement learning with physics software feedback may be extended to other theoretical model-building problems in the future.
Speaker: Max Fieg (University of California Irvine (US)) -
12:00
On-shell recursion relation for massive higher-spin Compton amplitudes 20m
We recursively construct tree-level electromagnetic and gravitational Compton amplitudes of higher-spin massive particles by the all-line transverse momentum shift. With three-point amplitude as input, we demonstrate that higher-point electromagnetic and gravitational Compton amplitudes are on-shell constructible up to spin $s = 3/2$ and $s = 5/2$, respectively, under the all-line transverse shift after imposing the current constraint condition. We unambiguously derive the four-point electromagnetic and gravitational Compton amplitudes for $s \leq 3/2$ and $s \leq 5/2$, which are uniquely determined by the on-shell recursion relation and are free from unphysical spurious poles. In addition, we explore amplitudes of spin-$3/2$ particles with non-minimal three-point interactions with photon, as well as $s > 3/2$ particles, and comment on their notable features. Our work furthers the understanding of on-shell methods for massive amplitudes, with hopes to shed light on physical observables in particle physics and higher-spin amplitudes relevant for Kerr black-hole scattering.
Speaker: Ishmam Mahbub (University of Minnesota Twin Cities) -
12:20
Uncertainty-Aware Discrimination of BSM Signatures in Embedding Spaces 20m
Representing hadronic parton distribution functions (PDFs) through flexible, high-fidelity parameterizations remains a long-standing goal of particle physics phenomenology. One crucial goal is to quantitatively connect experiments’ sensitivity to underlying theory assumptions, including a broad array of BSM and SMEFT scenarios, to the properties of the PDFs’ flavor and x-dependence. We explore this problem by encoding many SMEFT scenarios in contrastive embedding spaces generated from simulated QCD events. Within this space we apply evidence-based uncertainty quantification techniques to disentangle data (aleatoric) and knowledge (epistemic) uncertainty while identifying out of distribution samples. Equivalently important is the ability to exclude particular classes of theories, such as standard model-only physics scenarios, which we do through the identification of theory “superclasses.” I will present the latest progress in building these embedding spaces unifying dozens of SMEFT variants, demonstrating how model discrimination and anomaly detection naturally emerge alongside generation and classification tasks with uncertainty quantification.
Speaker: Brandon Kriesten
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Parallel: Top Physics 1 Room G
Room G
Monona Terrace
Convener: Didar Dobur (Ghent University (BE))-
11:00
ATLAS results on top quark properties 20m
The exceptionally large dataset collected by the ATLAS detector at the highest proton-proton collision energies provided by the LHC enables precision testing of theoretical predictions using an extensive sample of top quark events. New results on top-quark properties are shown. This includes the first observation of quantum entanglement in top-quark pair events and tests of lepton-flavour universality.
Speaker: Katharina Voss (Universitaet Siegen (DE)) -
11:20
Measurements of the top quark properties and its production at its kinematic threshold 20m
Precision measurements of the top quark properties are of paramount importance for our understanding of the SM. We present several measurements of asymmetries in top quark production and of its spin correlations. These measurements allow us to test the fundamentals of quantum mechanics at the highest energies achieved so far and also serve as an excellent probe for physics beyond the Standard Model. In addition, we study these correlations in top quarks pairs produced at their kinematic threshold, a region which is predicted to receive enhancements from non-relativistic QCD effects that are so far unexplored.
Speaker: Andreas Werner Jung (Purdue University (US)) -
11:40
ATLAS results on ttbar+heavy flavour measurements 20m
The top-quark pair production in association with heavy-flavour jets (b/c) is a difficult process to calculate and model and is one of the leading sources of background to ttH and 4tops in 1l/2LOS channel. To improve our understanding of this process, new measurements of this process have been performed.
Speaker: Alexander Khanov (Oklahoma State University (US)) -
12:00
Top quark production at the ttbar threshold 20m
Near the threshold of top quark pair production, non-relativistic QCD predicts an enhancement of ttbar production in pseudoscalar states. Color-singlet contributions are expected to produce a distinct resonance just below the tt threshold, offering a unique testable signature at the LHC. In this talk, we present the first observation of such a contribution in the dileptonic final state. In addition, we will discuss first results in the lepton+jets channel, providing further evidence. These findings mark the beginning of a new chapter in top quark physics and open up a novel avenue for studying bound-state effects involving top quarks.
Speaker: Tae Jeong Kim (Hanyang University (KR)) -
12:20
Toponium at the LHC 20m
We study the signature of toponium at the LHC.
Speaker: Ya-Juan Zheng
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Special Events: Top Personal Stories Grand Terrace
Grand Terrace
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Parallel: Accelerator Technologies 2 Room I
Room I
Monona Terrace
Convener: Emilio Nanni-
14:00
The US Magnet Development Program (MDP) Roadmap for future particle physics colliders. 20m
The Particle Physics Project Prioritization Panel (P5), a decadal strategic planning exercise of the Particle Physics Community, has released their final report. The report is based on input from “Snowmass,” a scientific study to define the most important questions for the field of particle physics and identify promising opportunities to address them. Taking input from Snowmass, P5 lays out a strategic plan and sets priorities for the field. A broad range of proposals for future facilities were put forward, with a few targeting 10 TeV pCM energy. All of these require beyond state-of-the-art superconducting materials and magnets and the US Magnet Development Program has created an updated R&D Roadmap to align with the P5 priorities. Enabling such facilities will involve tackling a variety of challenges that will be described in this talk.
Speaker: Stephen Gourlay -
14:20
800 MHz SRF R&D for FCC 20m
800 MHz bulk niobium superconducting RF cavities are a fundamental, and sizeable, component of the FCC machine at all operating points. In the Booster, for Z, W, and H operating points, there are 112 cavities in 28 cryomodules. For TTbar operation, there will be a total of 448 cavities in the booster in 112 cryomodules, The FCC cavity performance specifications currently sit at the upper limit of what present-day techniques can achieve, and still incur a high RF power budget, in addition to generating substantial static and dynamic heat loads per cavity, driving up cryogenic costs. In order to deliver the most cost-effective and feasible version of the FCC, R&D efforts on 800 MHz SRF cavities and cryomodules have begun, focusing on advanced surface treatments for bulk niobium on 5-cell and single-cell 800 MHz prototypes. We report the first cold test results of these prototypes, and propose a course for future development. In addition, FNAL is collaborating with CERN on the mechanical design of the 6-cell 800 MHz cavities and cryomodules, based on experience with PIP-II designs and production. We thus also present updates and future plans for 800 MHz SRF CM R&D for FCC.
Speaker: Kellen McGee (Fermi National Accelerator Laboratory) -
14:40
Rapidly Pulsed Synchrotron Acceleration Chain for a Fermilab Sited Muon Collider 20m
We present a preliminary lattice based on a bottom up design for a rapidly cycling synchrotron (RCS) accelerator chain for a multi-TeV muon collider based at Fermilab. The RCS rings range in circumference from 6.28 km (that of the Tevatron) to 15.5 km (the current estimate for the maximum that can be accommodated at the Fermilab site). Each ring is either a conventional RCS (consisting of iron dominated, ramped field magnets) or a hybrid RCS (consisting of interleaved ramped field and superconducting, coil dominated, fixed field magnets, which enable such rings to achieve higher average fields while retaining rapid ramping capabilities over their energy range). An injection energy of 63 GeV is used for the first ring (RCS 1). The tradeoff between the ultimate energy and the survival rate of the muons for different variants of the synchrotron chain is examined.
Speaker: Kyle Capobianco-Hogan -
15:00
Modification of Generating Functions For Dynamic Aperture Enlargement 20m
Particle accelerators are typically constrained in intensity of a beam due to a phenomenon known as the dynamic aperture (DA). This DA is typically determined by the elemental components of the lattice under consideration and is often constricted by the presence of nonlinear elements, such as sextupole magnets. However, the lattice may often be represented by an order $n$ Taylor map, which in turn may be used to find a corresponding generating function. We examine the possibility of modifying the generating function that describes the map for a given lattice in such a way as to adjust only the nonlinear contributions to the map, while keeping the linear structure of the lattice the same, thereby increase the possible DA of the lattice.
Speaker: Mr Kevin Hamilton (Northern Illinois University)
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Parallel: Dark Sectors (Direct/Indirect) Room KLOP
Room KLOP
Monona Terrace
Convener: Theresa Fruth (University of Sydney)-
14:00
Status of LUX-ZEPLIN (LZ) Experiment 20m
Ann M Wang, SLAC, for the LZ Collaboration
The LUX-ZEPLIN (LZ) experiment has been collecting data since 2021 to search for evidence of dark matter interactions and other rare physics phenomena using a dual-phase time projection chamber (TPC) filled with 7 tonnes of active xenon. The TPC is surrounded by a veto system designed to reject radioactive and muon backgrounds. The experiment is located at the Sanford Underground Research Facility in South Dakota, USA, and will collect 1000 days of live time in the search for dark matter. LZ has set the most stringent WIMP limits to-date, excluding spin-independent WIMP-nucleon cross sections down to a minimum of 2.2 x 10^{-48} cm^2 for a 43 GeV/cm^2 WIMP mass. In this talk, I will describe the experiment and report on the status and latest results.
Speaker: Ann Wang (SLAC) -
14:20
The SABRE South Experiment at the Stawell Underground Physics Laboratory 20m
SABRE is an international collaboration that will operate similar particle detectors in the Northern (SABRE North) and Southern Hemispheres (SABRE South). This innovative approach distinguishes possible dark matter signals from seasonal backgrounds, a pioneering strategy only possible with a southern hemisphere experiment. SABRE South is located at the Stawell Underground Physics Laboratory (SUPL), in regional Victoria, Australia.
SUPL is a newly built facility located 1024 m underground (∼2900 m water equivalent) within the Stawell Gold Mine and its construction has been completed in 2023.
SABRE South employs ultra-high purity NaI(Tl) crystals immersed in a Linear Alkyl Benzene (LAB) based liquid scintillator veto, enveloped by passive steel and polyethylene shielding alongside a plastic scintillator muon veto. Significant progress has been made in the procurement, testing, and preparation of equipment for installation of SABRE South. The SABRE South muon detector and the data acquisition systems are actively collecting data at SUPL and the SABRE South’s commissioning is planned to be completed by the end of 2025.
This presentation will provide an update on the overall progress of the SABRE South construction, its anticipated performance, and its potential physics reach.Speaker: Theresa Fruth (University of Sydney) -
14:40
First Physics Results from milliQan 20m
We will report the status of the milliQan experiment at CERN. The milliQan "bar" detector was completed in June 2023 and has been taking physics data since then. The milliQan "slab" detector was completed in Fall of 2024 and is being commissioned. We will give an update on the readiness of the slab detectorfor physics data taking. Finally, we will present first physics results on the search for millicharged particles using 127 fb$^{-1}$ Run 3 pp collision data recorded by the bar detector.
Speaker: Sai Neha Santpur (Univ. of California Santa Barbara (US)) -
15:00
SUB-Millicharge ExperimenT (SUBMET) at J-PARC 20m
The SUB-Millicharge ExperimenT (SUBMET) is designed to search for sub-millicharged particles produced in proton fixed-target collisions at J-PARC. The detector, positioned 280 meters downstream of the target, consists of two layers of stacked scintillator bars coupled to photomultiplier tubes (PMTs). The dominant background arises from random coincidences between the two detector layers, primarily due to PMT dark counts and environmental radiation. This background can be significantly mitigated using the precise timing structure of the proton beam. With a projected exposure of $N_{POT}=5\times10^{21}$, SUBMET aims to probe charges as low as $8\times 10^{−5}e$ for $m_\chi<0.2~\rm{GeV}/\rm{c}^2$, and down to $10^{−3}e$ for $m_\chi<1.6 ~\rm{GeV}/\rm{c}^2$—a parameter space largely inaccessible to previous experiments. The detector was installed in the spring of 2024, and beam data were collected in June and December of the same year. This presentation will provide an overview of the detector operation, studies conducted to characterize the detector response and background sources, and the prospects of the experiment.
Speaker: Jae Hyeok Yoo (Korea University (KR))
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Parallel: Hadron Physics 1 Room J
Room J
Monona Terrace
Convener: Rukmani Mohanta-
14:00
$D-\bar{D}$ mixing theory: new results 30m
The theoretical predictions for the $D-\bar{D}$ mixing parameters fall significantly short of experimental measurements, with discrepancies spanning several orders of magnitude. This divergence is largely attributed to the Glashow–Iliopoulos–Maiani (GIM) mechanism, which suppresses leading-order contributions. However, higher-order corrections and nonperturbative effects have the potential to mitigate this suppression, particularly through flavor SU(3) symmetry breaking. In this work, we explore the long-distance contributions arising from nonlocal QCD condensates, incorporating for the first time the impact of mixed condensates within multiple models. Our results demonstrate an improvement in the predicted values of $D-\bar{D}$ mixing parameters by an order of magnitude, providing insights into the role of nonperturbative QCD dynamics. While the theoretical estimates remain below experimental values, this study represents a crucial step toward bridging the gap between theory and observation, highlighting the importance of nonlocal QCD effects in understanding $D-\bar{D}$ mixing.
Speaker: Alexey Petrov (University of South Carolina) -
14:30
Quantum Tomography in Neutral Meson and Anti-meson System 20m
The flavor space of particles produced in collider environments provides informative quantum correlations. However, generally there is no first-principle calculation of the flavor state of the meson pair produced at colliders. In this work we construct a complementary set of measurements on the flavor state ultilizing the oscillation and decay of the meson pair, providing a systematic way to reconstruct the complete flavor density matrix of meson pairs.
Speaker: Kun Cheng (University of Pittsburgh) -
14:50
Analysis of B ->VV decays under $\text{SU}(3)_{\text{F}} \otimes \text{SU}(2)_{\text{spin}}$ 20m
The non-leptonic $B$-meson decays serve as excellent ground to test the Standard Model for example, how well are flavor symmetries such as isospin and flavor SU(3) realised in data, and their study is also important for new physics searches. As it has been observed, the analysis of $B \to PP$ decays where $B = \{B^0, B^+, B_s^0\}$ and $P = \{ \pi, K \}$ under the flavor SU(3) symmetry (SU(3)$_F$) exhibits disagreement with the SU(3)$_F$ limit of the standard model at the level of 3.6 $\sigma$. The individual fits to (strangeness conserving) $\Delta S$ = 0 and (strangeness changing) $\Delta S$ = 1 decay modes are good, whereas the combined fit assuming same theoretical parameters for $\Delta S$ = 0 and $\Delta S$ = 1 modes is poor. This suggests that SU(3)$_F$ symmetry is broken in the $B \to PP$ decays. An obvious extension is to test the SU(3)$_F$ breaking elsewhere, for eg. in the $B \to VV$ (V = {$\rho,K^*$}) decays. Also, there has been a long standing hadronic anomaly in the $B \to K \pi$ sector known as the $B \to K \pi$ puzzle where the measurements of the observables in these decays show
inconsistency with one another at $\sim$ 3 $\sigma$. In this talk, I will discuss about the theoretical formalism for studying the $B \to VV$ modes under $\text{SU}(3)_F$ $\times$ $\text{SU}(2)_{\text{spin}}$, with a particular focus on the $B \to \rho K^*$ sector for any similar puzzle.Speaker: Ms Ipsita Ray - 15:10
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Parallel: Leptoquarks, VLQs and other BSM Room F
Room F
Monona Terrace
Convener: David Sperka (Boston University (US))-
14:00
Searches for hadronically-decaying heavy vector bosons from the ATLAS Experiment 18m
Many new physics models predict the existence of heavy vector bosons which can decay hadronically, making these important signatures in the search for new physics. Searches for such resonances have been performed in various final states. This talk summarises the latest ATLAS searches for this topic.
Speaker: Zackary Lee Alegria (Oklahoma State University (US)) -
14:18
Measurement of the high-mass $\tau \bar{\tau}$ production cross-section and constraints on leptoquarks, Z’ bosons and effective couplings. 18m
The production of high-mass 𝜏-lepton pairs constitutes a very effective process to probe the Standard Model flavour sector and to search for new physics. The first measurement of the high-mass $\tau \bar{\tau}$ production cross section is presented, performed by the ATLAS Collaboration with the dataset of 140 fb-1 of pp collisions at $\sqrt{s} = 13$ TeV. New physics models are constrained through a fit to the di-tau invariant mass distribution as a function of b-jet multiplicity. Exclusion contours are presented, constraining the leptoquark models proposed to interpret the flavour anomalies in B hadron decays, as well as the production of Z’ bosons that couple preferentially to third-generation fermions. Additionally, constraints on effective field theory operators describing new particles are presented, including those affecting g-2 of the 𝜏 lepton.
Speaker: Simon Florian Koch (University of Oxford (GB)) -
14:36
Recent results on Vector Like Quarks/Excited Fermions at CMS 18m
Recent results on Vector Like Quarks/Excited Fermions at CMS
Speaker: Xiaohe Shen (Brown University (US)) -
14:54
Searches for VLQs and LQs from the ATLAS Experiment 18m
The Standard Model of Particle Physics explains many natural phenomena yet remains incomplete. Vectorlike quarks (VLQs) and leptoquarks (LQs) lie at the heart of many extensions to the Standard Model seeking to address the Hierarchy Problem, or the flavour sector anomalies. This talk will present the new results from searches with the ATLAS detector.
Speaker: Elin Bergeaas Kuutmann (Uppsala University (SE)) -
15:12
Recent results on heavy resonances at CMS 18mSpeaker: Yihui Lai (Princeton University (US))
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Parallel: Neutrino Physics 2 Room H
Room H
Monona Terrace
Convener: Minerba Betancourt-
14:00
Neutrino-nucleus interactions and the quest for new and precision physics searches in neutrino experiments 20m
Current and future accelerator-based neutrino facilities, leveraging intense neutrino beams and advanced detectors, aim to precisely determine neutrino properties and probe signals of weakly interacting beyond the Standard Model physics. Achieving discovery-level precision and fully exploring the physics potential of these experiments critically depends on the accuracy of our understanding of fundamental underlying neutrino-nucleus interaction processes. This talk will focus on neutrino interactions spanning energies from tens of MeV to a few GeV—a complex, multi-scale and multi-process domain spanning from low-energy nuclear physics to perturbative QCD, with no unified underlying framework currently known. In this talk, I will provide an overview of the field, discuss recent advancements, and share examples of ongoing cross-community efforts addressing these challenges.
Speaker: Dr Vishvas Pandey -
14:20
Neutrino Interaction Measurements with the SBND Experiment 20m
The Short-Baseline Near Detector (SBND) is a 112-ton scale Liquid Argon Time Projection Chamber (LArTPC) neutrino detector positioned in the Booster Neutrino Beam at Fermilab, as part of the Short-Baseline Neutrino (SBN) program. The detector is currently collecting neutrino beam data. Located only 110 m from the neutrino production target, SBND is exposed to a very high flux of neutrinos and will collect millions of neutrino interactions each year. This huge number of neutrino interactions, with the precise tracking and calorimetric capabilities of LArTPC, enables a wealth of cross section measurements to be made with unprecedented precision. In addition, SBND has the unique characteristic of being remarkably close to the neutrino source and not perfectly aligned with the neutrino beamline, in such a way that allows sampling of multiple neutrino fluxes using the same detector, a feature known as SBND-PRISM. SBND-PRISM can be utilized to study distinctive neutrino-nucleus interactions channels. This talk will motivate the SBND cross-section physics program, present ongoing measurement efforts, and discuss prospects for the rich program ahead.
Speaker: Francisco Javier Nicolás-Arnaldos (UT-Arlington) -
14:40
Neutrino cross-section results from T2K 20m
The T2K experiment's primary off-axis near detector, ND280, has the essential role of constraining the main systematic uncertainties that affect neutrino oscillation measurements. Among the leading sources of these uncertainties are neutrino-nucleon interaction cross sections, which must be more precisely understood to fully exploit the potential of current and future long-baseline neutrino experiments. ND280 is a multi-layered magnetised tracking detector with an variety of different target nuclei; it is capable of making precise measurements of cross-section topologies which form the main signal and background channels in T2K's oscillation analysis and is particularly well suited for studying rare interaction channels relevant to the $\nu_\mu \rightarrow \nu_e$ appearance signal. The cross-section measurements obtained at ND280 directly inform the theoretical models of neutrino interactions, helping to refine our understanding of this field and enabling more accurate determinations of oscillation parameters. This talk will present several novel cross-section results from T2K, including new measurements in muon neutrino charged current interactions with and without pions and world-first measurements of neutral-current single pion production and electron neutrino charged-current pion production on carbon.
Speaker: Martin Mihaylov Tzanov (Louisiana State University (US)) -
15:00
Understanding Cross Section Model Uncertainties in Neutrino Experiments 20m
A deep understanding of neutrino-target interactions is crucial to reduce the systematic uncertainties for oscillation parameter measurements. We investigate the effect of final-state interactions (FSI) in the charge current quasi-elastic (CCQE) channel by reconstructing the neutrino energy using the calorimetric method. A selection of events with 1 proton, 0 pion, and any number of neutrons in the final state reduces the discrepancy between reconstructed and true neutrino energy for the CCQE process analyzed for DUNE and MicroBooNE using Monte-Carlo simulations. Since the reconstruction of neutrino energy is important for improving cross-section measurements, the Kaon-Decays-At-Rest (KDAR) neutrinos provide an opportunity to study the neutrino interactions in the low-energy regime with a known neutrino energy of 235.5 MeV. We explore the missing energy in KDAR νμ CC scattering on Carbon in JSNS2 using MC generators. In addition to FSI, the initial state of nucleon also affects the cross-section measurements. We study the reconstruction of the Fermi motion of the target nucleon in MC generators using the MINERvA π0 measurement. The MC predictions describe the data more accurately in the higher momentum tail however, discrepancies with data below the Fermi peak highlight the limitations in current models used in the Monte Carlo generators. Moreover, a thorough understanding of resonance states and their properties is required for the measurements of RES cross-section. We also analyse the contribution of the second resonance region to the total neutrino-Argon cross-section in the DUNE near detector.
Speaker: Anjan Giri (IIT Hyderabad)
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Parallel: Theory 2 Room E
Room E
Monona Terrace
Conveners: Jakob Moritz (University of Wisconsin Madison (US)), Yuta Hamada (KEK)-
14:00
Decomposing Tensor Product of Two-dimensional Rational Conformal Field Theories with the Transformer Model 20m
We apply the Transformer architecture to explore the vast theory space of two-dimensional Rational Conformal Field Theories (RCFTs) spanned by their tensor products. Our data features the primary conformal dimension and the central charge of the RCFTs from different families, most of which come from the affine Kac-Moody algebra. Constructing the tensor product models based on RCFTs is often controllable due to their exact-solvability but the reverse-engineering task is not. We thus tackle the following inverse problem: given limited information about the spectra of a theory, can we decompose the theory in terms of RCFTs. The problem can be formulated in a standard sequence-to-sequence task suitable for the Transformer model. We design several experiments that work on different families of RCFTs and their tensor products at arbitrary values of central charge. In most cases, we obtain a high accuracy (>90%) using Transformers with small parameters. Our work shows that the Transformer model is able to work on RCFT data and potentially extends our knowledge about the theory space of two-dimensional RCFTs that can be infinitely large.
Speaker: Mr Haotian Cao (University of Wisconsin-Madison) -
14:20
The Weak Gravity Conjecture and Quantum Gravity 20m
The Weak Gravity Conjecture (WGC), an important proposal for consistency of quantum gravity, states a relation between gravity and Abelian gauge interactions of a consistent EFT. In flat space, the WGC necessitates existence of a charged particle with charge-to-mass ratio larger than that of the extremal black holes. However, the statement needs revision in general spacetimes. In this talk, I will discuss the formulation of the WGC that applies to theories with a cosmological constant and dilaton field. Adhering to the original motivation for WGC of extremal black hole decay, we analyze the dynamics of black hole charged emission and a repulsive force condition between extremal black holes and charged particles, providing a general prescription of obtaining the WGC bound. Further, the differences and relations between WGC and other bounds including the black hole extremality condition will be explained.
Speaker: Mr Puxin Lin (University of Wisconsin-Madison) -
14:40
Learning New Constructions of Toric Calabi-Yau Manifolds with Transformers 20m
Fine, regular, and star triangulations (FRSTs) of 4-dimensional reflexive polytopes generate toric varieties, within which Calabi-Yau threefolds can be embedded as hypersurfaces. We use transformers---deep learning models originally developed for language modeling---to generate FRSTs of polytopes of varying sizes. Our method shows promising scalability with polytope size and can be continuously improved through self-improvement and priming strategies, laying the groundwork for a self-updating online database of Calabi-Yau manifolds.
Speaker: Jacky Hoi Tung Yip (University of Wisconsin-Madison) -
15:00
GSO Defects, IIA/IIB Walls, and a Surprisingly Stable R7-Brane 20m
The recently proposed Swampland Cobordism Conjecture predicts the existence of new non-supersymmetric objects in string theory. We argue that the asymptotic profile of a conjectured target space domain wall separating the type IIA and type IIB string theories can be characterized in terms of a string worldsheet interface with different GSO projections on each side. Similar considerations hold for GSO defects in the Spin(32)/Z2 heterotic theory where the strong coupling dual of such a domain wall is the (known) non-BPS D8 brane in type I string theory. Furthermore, we find evidence that the endpoint of collapse for a bubble configuration of the IIA/IIB wall is a non-supersymmetric R7 brane of Type II string theory, providing evidence for its stability.
Speaker: Ethan Martin Torres (CERN)
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Parallel: Top Physics 2 Room G
Room G
Monona Terrace
Convener: Ian Lewis (The University of Kansas)-
14:00
Quantum Entanglement and Bell Inequality Violation in Semi-Leptonic Top Decays 20m
Quantum entanglement is a fundamental property of quantum mechanics. Recently, studies have explored entanglement in the $t\bar{t}$ system at the Large Hadron Collider. In this talk, I will first introduce the search for evidence of quantum entanglement in the semi-leptonic decay channel of $t\bar{t}$. We find that this channel is both easier to reconstruct
and has a larger effective quantity of data than the fully leptonic channel, which is 60% more sensitive to quantum entanglement and a factor of 3 more sensitive to Bell inequality violation. Beyond the collider search, I will discuss the physics meaning of such entangled states, and some recent progress.Speaker: Arthur Wu -
14:20
ATLAS results on top, ttbar and associated cross sections [Zoom] 20m
The exceptionally large dataset collected by the ATLAS detector at the highest proton-proton collision energies provided by the LHC enables precision testing of theoretical predictions using an extensive sample of top quark events. Recent measurements include total and differential top quark cross sections, as well as measurements of associated top quark production. This contribution presents the latest highlights from the ATLAS top quark physics program, including key measurements from Run II, and new results using Run III data.
Speaker: Peter Berta (Charles University, Prague (CZ)) -
14:40
Cross section measurements of top quark production 20m
The unprecedented size of the dataset collected by the CMS detector at the LHC allows us to explore increasingly rare top quark production modes and high precision measurements of the more copious ones. We present various measurements of the top quark production in different production modes, including those in which the top quarks are produced in association with electroweak bosons. The measurements improve in precision with respect to previous measurements, and give further insight on the properties of the top quark, including its interactions with other SM particles, allowing us to test the theoretical predictions with unprecedented precision.
Speaker: Luka Lambrecht (Brown University (US)) -
15:00
ATLAS results on top quark mass 20m
The top-quark mass is one of the key fundamental parameters of the Standard Model that must be determined experimentally. Its value has an important effect on many precision measurements and tests of the Standard Model. The Tevatron and LHC experiments have developed an extensive program to determine the top quark mass using a variety of methods. In this contribution, the top quark mass measurements by the ATLAS experiment are reviewed. These include measurements in two broad categories, the direct measurements, where the mass is determined from a comparison with Monte Carlo templates, and determinations that compare differential cross-section measurements to first-principle calculations.
Speaker: Makoto Tomoto (KEK High Energy Accelerator Research Organization (JP))
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Afternoon Break 30m
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Plenary: Monday Afternoon Plenary Lecture Hall
Lecture Hall
Monona Terrace
Convener: Sergo Jindariani (Fermi National Accelerator Lab. (US))-
16:00
ICFA report 15mSpeakers: Pierluigi Campana (Frascati), Pierluigi Campana (Laboratori Nazionali di Frascati (LNF))
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Top measurements and rare ttX processes 30m
Common ATLAS and CMS presentation
Speaker: Frederic Deliot (Université Paris-Saclay (FR)) -
16:45
Above the top: Panel on future of particle physics 45mSpeakers: Dmitri Denisov (Brookhaven National Laboratiry), Heidi Marie Schellman (Oregon State University (US)), Karri DiPetrillo (University of Chicago), Mark Thomson (CERN), Pierluigi Campana (Laboratori Nazionali di Frascati (LNF)), Tulika Bose (University of Wisconsin Madison (US)), Wang Yifang (IHEP,CAS), Young-Kee Kim (University of Chicago (US))
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Special Events: RoofTOP - Celebrating Top (30y) and nuTau (25y) Anniversaries Roof TOP
Roof TOP
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Get to the top! 10m
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Group Picture 5m
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Celebratory cake cutting 5mSpeakers: Mark Thomson (CERN), Young-Kee Kim (University of Chicago (US))
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Plenary: Tuesday Lecture Hall
Lecture Hall
Monona Terrace
Convener: Christoph Paus (Massachusetts Inst. of Technology (US))-
09:00
Higgs couplings and properties 30m
Common ATLAS and CMS presentation
Speaker: Haider Abidi (Brookhaven National Laboratory (US)) -
09:30
Di-Higgs Searches 30m
Common ATLAS and CMS presentation
Speakers: SHIN-SHAN YU (FERMILAB), Shin-Shan Yu (Catholic University of America (US)) - 10:00
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Morning Break 30m
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Parallel: Charged Lepton Flavor Violation 2 Room J
Room J
Monona Terrace
Convener: Prof. Toshinori Mori (University of Tokyo (JP))-
11:00
Latest results of $\mu \to e \gamma$ search with the MEG II experiment 20m
The MEG II experiment searches for the lepton-flavor-violating muon decay, $\mu^+ \to e^+ \gamma$, utilizing the most intense continuous muon beam at Paul Scherrer Institut and innovative high-resolution detectors, with a target sensitivity of $6 \times 10^{-14}$. The experiment started collecting physics data in 2021 and has been accumulating statistics. The latest result, based on the data collected in 2021 and 2022, has achieved the most sensitive search to date. No signal excess was found, and the most stringent upper limit on the branching ratio was set to $1.5 \times 10^{-13}$ at the 90% confidence level. We will reach the sensitivity goal with further data acquisition anticipated by 2026 and analysis improvements. This presentation will provide the latest results and the prospects of the $\mu^+ \to e^+\gamma$ search with the MEG II experiment.
Speaker: Kensuke Yamamoto (The University of Tokyo) -
11:20
The COMET Experiment for the Search of Muon-to-Electron Conversion 20m
The COMET experiment aims to search for the process of muon-to-electron conversion in a muonic atom, with a ultimate goal of achieving a sensitivity on the order of 10$^{-17}$. This process violates the charged lepton flavor conservation and is forbidden in the Standard Model of the particle physics. Therefore, its discovery would be a clear evidence of the new physics. After the first engineering run for beam commissioning in 2023, the construction of the experimental facility and the detectors is now underway toward the physics run of the COMET Phase-I, which aims for a sensitivity of 3$\times$10$^{-15}$. The pion capture solenoid magnet, the largest experimental equipment, has already been installed, and delivery of the remaining detector solenoid is scheduled for this year. Following the magnets, the installation of the detector system will be carried out. This talk will provide an update on the current status of the COMET experiment construction.
Speaker: Yoshinori Fukao (High Energy Accelerator Research Organization) -
11:40
Long-lived Axion-Like Particles from Tau Decays 20m
Axion-like particles (ALPs) are well-motivated examples of light, weakly coupled particles in theories beyond the Standard Model. We study constraints on long-lived ALPs with mass between the electron and the tau mass, coupled exclusively to leptons. For anarchic flavor structure the leptophilic ALP production in tau decays or from ALP-tau bremsstrahlung is enhanced thanks to derivative couplings of the ALP and can surpass production from electron and muon channels, especially for ALPs heavier than the muon. Using past data from high-energy fixed-target experiments such as CHARM and BEBC we place new constraints on the ALP decay constant , reaching scales as high as $\mathcal{O}(10^8)$ GeV in lepton-flavor-violating channels and $f_a \sim \mathcal{O}(10^2)$ GeV in lepton-flavor-conserving ones. We also study projections for the event-rate sensitivity of current and future detectors to ALPs produced at the Fermilab Main Injector, the CERN SPS, and in the forward direction of the LHC. SHiP will be sensitive to $f_a$ values that are over an order of magnitude above the existing constraints.
Speaker: Patrick Fox -
12:00
Direct Detection of Ultralight Dark Matter via Charged Lepton Flavor Violation 20m
I will discuss a proposed dark matter direct-detection strategy using charged particle decays at accelerator-based experiments. If ultralight $(m_\phi \ll \text{eV})$ dark matter has a misalignment abundance, its local field oscillates in time at a frequency set by its mass. If it also couples to flavor-changing neutral currents, rare exotic decays such as $\mu \to e \phi'$ and $\tau\to e(\mu)\phi'$ inherit this modulation. Focusing on such charged lepton flavor-violating decays, we show that sufficient event samples can enable detection of ultralight dark matter candidates at Mu3e, Belle-II, and FCC-ee.
Speaker: Dr Innes Bigaran (Fermilab and Northwestern University)
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11:00
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12:30
Parallel: Dark Sectors at Colliders 1 Room KLOP
Room KLOP
Convener: Tulika Bose (University of Wisconsin Madison (US))-
11:00
Introduction to Searches in the Dark Sectors at Colliders [Zoom] 30mSpeaker: Suchita Kulkarni (University of Graz)
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11:30
Exploring new physics in the Dark Sector at CMS 20m
Exploring new physics in the Dark Sector at CMS
Among the intriguing scenarios of new physics that provide explanation to several shortcomings of the Standard Model (SM), hidden valley scenarios include a Dark Sector that extends the SM with a non-Abelian gauge group, similar to quantum chromodynamics with new matter and gauge fields analogous to the SM quark and gluon fields. This may result in a rich phenomenology which we can access through portal interactions. In this talk we present the most recent results from CMS that explore such Dark Sectors by exploiting dedicated data streams and innovative usage of the CMS detector. We focus on the recent results obtained using the full Run-II data-set collected at the LHC.
Speaker: Kai Hong Law (Imperial College (GB)) -
11:50
Searches for unusual signatures from dark sectors from the ATLAS Experiment 20m
Various theories beyond the Standard Model predict unusual signatures or new, long-lived particles decaying at a significant distance from the collision point. These unique signatures are difficult to reconstruct and face unusual and challenging backgrounds. The talk will focus on the most recent results using pp collision data collected by the ATLAS detector.
Speaker: Danielle Joan Wilson-Edwards (The University of Manchester (GB)) -
12:10
Searches for dark sector particles at Belle and Belle II 20m
The Belle and Belle II experiment have collected samples of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. These data have constrained kinematics and low multiplicity, which allow searches for dark sector particles in the mass range from a few MeV to 10 GeV. Using a 365 fb$^{-1}$ sample collected by Belle II, we search for inelastic dark matter and an $Z^{\prime}$ that decays to invisible particles. Using a 711 fb$^{-1}$ sample collected by Belle, we search for $B\to h + \mathrm{invisible}$ decays, where $h$ is a $\pi$, $K$, $D$, $D_{s}$ or $p$, and $B\to Ka$, where $a$ is an axion-like particle.
Speaker: Prof. Youngjoon Kwon (Yonsei University)
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11:00
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11:00
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12:40
Parallel: EWK Physics 1 Room F
Room F
Convener: Matthew Herndon (University of Wisconsin Madison (US))-
11:00
Measurement of rare electroweak processes including vector boson scattering and triboson in ATLAS 20m
Measurement of rare processes in the electroweak sector poses unprecedented stringent test of the SM theory, and in particular offers unique sensitivity to study the electroweak symmetry breaking (VBS processes) and the quartic boson self-couplings (VBS and triboson processes). In addition to cross-section measurements, systematic study of boson polarization states in VBS processes is being actively pursued to hopefully bring further sensitivity and uncover deeper insights. This talk will summarize recent achievements from ATLAS on this topic.
Speaker: Diego Baron (The University of Manchester (GB)) -
11:20
Vector Boson Scattering measurements at CMS 20m
Vector boson scattering is a key production process to probe the electroweak symmetry breaking of the standard model, since it involves both self-couplings of vector bosons and coupling with the Higgs boson. If the Higgs mechanism is not the sole source of electroweak symmetry breaking, the scattering amplitude deviates from the standard model prediction at high scattering energy. Moreover, deviations may be detectable even if a new physics scale is higher than the reach of direct searches. Latest measurements of production cross sections of vector boson pairs in association with two jets in proton-proton collisions at sqrt(s) = 13 and 13.6 TeV at the LHC are reported using a data set recorded by the CMS detector. Differential fiducial cross sections as functions of several quantities are also measured.
Speaker: Irene Zoi (Fermi National Accelerator Lab. (US)) -
11:40
Measurement of diboson production and precision EFT constraints in ATLAS [Zoom] 20m
Measurement of diboson events is a unique venue at the LHC, offering precision test of SM QCD and EW predictions at unprecedented accuracies relevant to this sector, and sensitive probe of the non-Abelian structure of SM EW theory, leading to stringent constraints on Effective Field Theory wilson coefficients. This talk will summarize recent achievements from ATLAS on this topic.
Speaker: Shu Li (Tsung-Dao Lee Institute, Shanghai Jiao Tong Univ. (CN)) -
12:00
Measurements of Triboson production at CMS 20m
Measurements of Triboson production at CMS
Speaker: Keegan Everett Downham (Univ. of California Santa Barbara (US)) -
12:20
Testing the lepton content of the proton at HERA and EIC 20m
Although protons are baryons with an overall vanishing lepton number, they possess a non-trivial leptonic content arising from quantum fluctuations which can be described by lepton parton distribution functions (PDFs) of the proton. These PDFs have been recently computed and can be used to define lepton-induced processes at high-energy colliders. In this article, we propose a novel way to test the computation of lepton PDFs of the proton by analyzing both non-resonant di-lepton and resonant Z gauge boson production processes induced by leptons within the proton at proton-electron colliders like HERA and EIC. Despite the fact that lepton PDFs of the proton are known to be small, this work demonstrates that both processes imply a measurable yield of events at HERA and EIC, which could be used to test these PDFs.
Speaker: Dr Subhojit Roy (Argonne National Laboratory)
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11:00
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11:00
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12:40
Parallel: Future Colliders 1 Lecture Hall
Lecture Hall
Convener: Ankur Dhar (SLAC National Accelerator Lab)-
11:00
A Linear Collider Vision for the Future of Particle Physics 20m
We review linear e+e− colliders with a special focus on high centre-of-mass energies and beam polarisation, take a fresh look at the various accelerator technologies available or under development and, for the first time, discuss how a facility first equipped with a technology mature today could be upgraded with technologies of tomorrow to reach much higher energies and/or luminosities. In addition, we will discuss alternative collider modes, as well as opportunities for beyond-collider experiments and R&D facilities as part of a linear collider facility (LCF). The material of this presentation will support all plans for e+e− linear colliders and additional opportunities they offer, independently of technology choice or proposed site, as well as R&D for advanced accelerator technologies. This joint perspective on the physics goals, early technologies and upgrade strategies has been developed by the LCVision team. It heavily builds on decades of achievements of the global linear collider community, in particular in the context of ILC, CLIC and C3, and recent highlights of the projects will also be presented.
Speaker: Juergen Reuter (DESY Hamburg, Germany) -
11:20
Progress of the Super Tau Charm Facility in China 20m
The Super Tau Charm Facility (STCF), a planned symmetric electron-positron collider in China, aims to facilitate $e^+e^−$ collisions across a center-of-mass energy range of 2 to 7 GeV, targeting a peak luminosity of $0.5×10^{35}\mathrm{cm}^{−2}\mathrm{s}^{−1}$. With an anticipated annual integrated luminosity exceeding $1~ab^{−1}$, the STCF is poised to generate vast datasets. These will enable precision measurements of XYZ particles' properties, exploration of new CP violation sources within strange-hyperon and tau-lepton sectors, and accurate Cabibbo angle ($\theta_c$) measurements to test the unitarity of the CKM matrix; search for anomalous decays with sensitivities extending down to the level of SM-model expectations, among other objectives. This talk will cover the STCF's physics goals and outline the latest advancements in the project’s R&D.
Speaker: Qipeng Hu (University of Science and Technology of China (CN)) -
11:40
A muon system with drift tubes and scintillator strips for FCC-e 20m
Gaseous detectors play a critical role in the design of the inner tracker and muon detector systems for the Future Circular Collider electron-positron (FCC-ee) experiment. The muon detector is essential for muon identification and triggering. Precise measurements of charged particle segment directions and arrival times enable searches for exotic phenomena, such as long-lived particles and charged massive stable particles. To meet these demands, a design incorporating drift tubes and scintillator strips has been proposed, offering high spatial and temporal resolution, cost efficiency, and reliable performance. This presentation will discuss the development of a muon detector combining drift tubes and scintillator strips for FCC-ee experiments.
Speaker: Linnuo Zhang (University of Science and Technology of China (CN)) -
12:00
R&D Studies on the ALLEGRO Noble Liquid Calorimeter for FCC-ee 20m
The Future Circular Collider in its first stage, an electron-positron collider (FCC-ee), presents a broad physics program with multiple challenges for detector design. It aims to enable precision measurements of the electroweak sector at an unprecedented level and facilitate searches for new particles weakly coupled to the Standard Model. ALLEGRO is one of the proposed detector concepts suitable for FCC-ee.
The electromagnetic calorimeter (ECAL) in ALLEGRO will utilize noble liquid technology, developed as a part of the Detector R&D Collaboration for Calorimeters (DRD6). The ECAL design has been optimized for FCC-ee, featuring a multilayer structure with straight readout electrodes that enable fine segmentation. This high granularity is crucial for advanced reconstruction techniques, including machine learning algorithms and particle flow methods. The performance of the readout electrodes will be discussed based on experimental measurements and compared with simulation results.
Additionally, intensive R&D efforts on the mechanical structure of the calorimeter (including absorber plates, support structures, and spacers) will be presented, along with progress toward a beam test prototype. The integration of the ALLEGRO detector geometry and reconstruction algorithms within the key4hep software framework will also be covered, highlighting expected performance.
Speakers: Chris Rasmussen, Chris Rasmussen (Brookhaven National Laboratory (US)) -
12:20
A Straw Tracker for FCC-ee Experiments 20m
We propose to build a straw tracker as an inner tracking system for FCC-ee experiments. The straw tracker offers the advantage of a low material, a crucial factor in minimizing overall inner detector material budget. With the capability to achieve a single-hit resolution of approximately 100 microns per layer, and the potential for up to 100 layers, the straw tracker will play a pivotal role in pattern recognition and particle identification. Each individual straw serves as a standalone unit, facilitating easy removal of a channel in case of a broken sense wire. The electric field is radial symmetric and the hit position resolution is thus independent of the particle's incident angle. We will present performance studies based on GEANT simulations and cosmic ray data, along with preliminary results on particle identification using the primary cluster counting method (dN/dX).
Speaker: Jessaly Zhu
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11:00
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12:40
Parallel: Instrumentation 1 Room I
Room I
Convener: ALBRECHT KARLE-
11:00
Development of the New Optical Sensor for IceCube-Gen2 20m
A new digital optical module (DOM) has been developed for the proposed expansion to the IceCube detector at the South Pole, IceCube-Gen2. The “Gen2-DOM” has 4 times the integrated photon sensitivity of the current IceCube DOMs and has built off the design features of the IceCube Upgrade modules. The Gen2-DOM has up to 18 4" photomultiplier tubes (PMTs) in a borosilicate glass pressure vessel, arranged in a uniform 4π angular distribution. The mechanical design has been optimized to fit into a reduced borehole diameter which, in turn, will reduce drilling costs during installation. Each PMT has a fully digitized readout, designed to increase sensitivity to high energy events aligned with the science goals of IceCube-Gen2. Internal storage enables multi-level triggering schemes with reduced overall flow of data on the long cables. Twelve prototypes of the Gen2-DOM will be deployed in the IceCube Upgrade in the 2025/2026 Austral summer. This poster will focus on the current status of design development and initial performance testing results.
Speaker: Delaney Butterfield (University of Wisconsin-Madison) -
11:20
Status of the ATLAS Tile Calorimeter 20m
The Tile Calorimeter (TileCal) is a sampling hadronic calorimeter covering the central region of the ATLAS experiment, with steel as absorber and plastic scintillators as active medium. The scintillators are read-out by the wavelength shifting fibers coupled to the photomultiplier tubes (PMTs). The analogue signals from the PMTs are amplified, shaped, digitised by sampling the signal every 25 ns and stored on detector until a trigger decision is received. The TileCal front-end electronics reads out the signals produced by about 10000 channels measuring energies ranging from about 30MeV to about 2 TeV. Each stage of the signal production from scintillation light to the signal reconstruction is monitored and calibrated. A summary of recent performance results and its High Luminosity LHC upgrade project will be presented.
Speaker: Haleh Hadavand (University of Texas at Arlington (US)) -
11:40
Performance of the CMS ECAL and of electron and photon reconstruction in Run 3 20m
The Electromagnetic Calorimeter (ECAL) of the CMS experiment at the LHC plays a vital role in various physics analyses, including Higgs boson studies and searches for new phenomena. Achieving accurate calibration of the detector and its individual channels is critical for optimizing the energy resolution of electrons and photons, as well as for measuring the electromagnetic components of jets and contributing to energy sums used to detect particles that do not generate a signal in the detector. To maintain consistent energy response over time, a laser monitoring system is utilized to track radiation-induced changes and compensate for them during data reconstruction. Additionally, each channel undergoes calibration using physics events. This presentation will review the methods employed for ECAL energy and time calibration and introduce a novel system developed to automate the calibration processes. The performance of the ECAL in 2024 and 2025 will also be highlighted. In addition, the performance and some recent developments in the reconstruction and identification of electrons and photons using early Run 3 data will be discussed. Advances include improved calibration techniques, better identification algorithms, and novel reconstruction strategies.
Speaker: Riccardo Salvatico (CERN) -
12:00
The CMS ECAL upgrade for the High-Luminosity LHC 20m
The High Luminosity upgrade of the CERN LHC (HL-LHC) will deliver unprecedented instantaneous and integrated luminosities to the detectors and an average of up to 200 simultaneous interactions per bunch crossing is expected. The CMS detector is undergoing an extensive Phase-2 upgrade program to prepare for these severe conditions and a major upgrade of the electromagnetic calorimeter (ECAL) is foreseen. While a new detector will be installed in the endcap regions, the ECAL barrel crystals and photodetectors are expected to sustain the new conditions. However, the entire readout and trigger electronics system will be replaced to cope with the challenging HL-LHC environment and increased trigger latency requirements. This talk will present the design and status of the individual components of the upgraded ECAL barrel detector, and the results of energy and time resolution measurements with a full readout chain prototype system in recent test beam campaigns.
Speaker: Colin Jessop (University of Notre Dame (US)) -
12:20
The High-Granularity Timing Detector for the ATLAS experiment at the HL-LHC 20m
The increased particle flux at the HL-LHC poses a significant challenge to the
ATLAS detector’s performance, particularly in the forward region which has reduced
detector granularities. To address this challenge, ATLAS is adding the High-
Granularity Timing Detector (HGTD), utilizing novel Low-Gain Avalanche Detector
(LGAD) silicon technology. The HGTD will provide capabilities for pileup mitigation
and precise luminosity measurements, complementing the new all-silicon Inner
Tracker in the pseudo-rapidity range of 2.4 to 4.0. Two double-sided layers of the
HGTD, with a total of 3.7 million 1.3×1.3 mm² pixels, will provide a timing resolution
of better than 50 ps/track throughout the HL-LHC operational period. This allows
improving the assignment of tracks to their correct vertices based on timing
information, by discerning the pp interactions happening in each bunch crossing in
the temporal dimension. A comprehensive overview will be provided, outlining the
requirements, technical designs, recent results from preproduction sensors and
readout electronics modules, and the project’s status.Speaker: Lei Zhang (Nanjing University (CN))
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11:00
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11:00
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12:40
Parallel: Quark Flavor 1 Room G
Room G
Convener: Alexey Petrov (University of South Carolina)-
11:00
Baryonic CP violation at LHCb 20m
The LHCb detector is optimized for performing precision flavour measurements. Thanks to its particle-identification capabilities it is able to fully exploit the potential of the Large Hadron Collider. In this talk, recent results regarding the study of $C\!P$ violation in beauty-baryon decays at LHCb will be presented. The study of these decays is particularly interesting because, prior to the analyses discussed in the talk, $C\!P$ violation in the baryon sector had never been observed. Moreover, the decays of beauty baryons receive contributions from the same diagrams responsible for the decay of $B$ mesons, where $C\!P$ violation is indeed well established.
Speaker: Marco Caporale (Universita e INFN, Bologna (IT)) -
11:20
Measurements $C\!P$ violation and hadronic $B$ decay at Belle and Belle II 20m
The Belle and Belle II experiment have collected a 1.2 ab$^{-1}$ sample of $e^+e^-\to B\bar{B}$ decays at a centre-of-mass energy corresponding to the $\Upsilon(4S)$ resonance. The SuperKEKB collider is asymmetric, providing a boost to the $B$ mesons in the laboratory frame, so we can perform measurements of time-dependent $C\!P$ violation. Among the new results, we measure $CP$-violating parameters related to the determination of the least well-known angle of the unitarity triangle $\alpha$ using the decay $B^0\to\rho^+\rho^-$. In addition, we present a measurement of $B^0\to K^{0}_{\rm S}\pi^+\pi^-\gamma$, which is sensitive to beyond-the-standard-model physics. In addition, the study of hadronic $B$ decays in these data allow the precise measurement of absolute branching fractions and angular distributions of the decay products. These measurements provide tests of QCD and allow the generation of more realistic simulation samples. We present several measurements including that of the decay $\bar{B}^0\to D^+\pi^-\pi^0$ and $B$ decays to baryons.
Speakers: Luka Santelj (IPHC Strasbourg), Luka Santelj, Luka Santelj (Jozef Stefan Institute) -
11:40
Measurements of electroweak penguin and lepton-flavour violating $B$ decays to final states with missing energy at Belle and Belle II 20m
The Belle and Belle II experiments have collected a 1.2 ab$^{-1}$ sample of $e^+ e^-\to B\bar{B}$ collisions at a centre-of-mass energy corresponding to the $\Upsilon(4S)$ resonance. These data, with low particle multiplicity and constrained initial state kinematics, are an ideal environment to search for rare electroweak penguin $B$ decays and lepton-flavour-violating $B$ decays to final states with missing energy from neutrinos.
Results from $b\to s\nu\bar{\nu}$ processes and their interpretation are presented. In addition, we present searches for the processes $B\to K^{(*)}\tau^+\tau^-$. Finally, we present our searches for the lepton-flavour violating decays $B\to K^{(*)}\tau^{\pm}\ell^{\mp}$, where $\ell$ is an electron or muon.Speaker: Gaetano de Marino (Jožef Stefan Institute) -
12:00
Quantum-correlation of neutral charmed mesons at BESIII 20m
BESIII has recently accumulated a large data sample at the $\psi(3770)$ energy point corresponding to an integrated luminosity of 20 $fb^{-1}$. The neutral $D\bar{D}$ pairs produced at the $\psi(3370)$ are in a C-odd correlated state, providing a unique laboratory to measure the strong-phase differences between $D^0$ and $\bar{D}^0$ decays. These parameters are essential inputs to CP violation studies in heavy flavour physics, especially the determination of the CKM angle gamma and charm mixing parameters, and the search for indirect CP violation in the charm sector. In this presentation, we will report recent new and improved measurements of the strong-phase differences in different neutral D decays at BESIII, along with the CP-even fraction of $D^0 \to \pi^+\pi^-\pi^0$, $K^+K^-\pi^0$, $K^+K^-\pi^+\pi^-$, and $\pi^+\pi^+\pi^-\pi^-$. We will also discuss the uncertainties contributed by the strong-phase inputs to the angle $\gamma$ determination.
Speakers: Alex Gilman, Alex Gilman -
12:20
Measurements of the CKM angle $\gamma$ at LHCb 20m
A precise measurement of the CKM angle $\gamma$ is a standard candle test of CP violation in the Standard Model and a central goal of the LHCb experiment. The latest LHCb results from measurements of CP violation using beauty to open charm decays are presented. These include novel measurements using the full LHCb Run 1+2 data sample and the latest LHCb combination of $\gamma$ and charm mixing measurements.
Speaker: Aidan Richard Wiederhold (The University of Manchester (GB))
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11:00
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11:00
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12:40
Parallel: Theory 3 Room E
Room E
Convener: Yang Bai-
11:00
BSM theory review 20m
In this talk, I am going to review recent development of BSM theories.
Speaker: Peisi Huang -
11:20
Bubble wall velocity calculation and implications for baryogenesis and gravitational waves 20m
A precise determination of the bubble wall velocity $v_w$ is crucial for making accurate predictions of the baryon asymmetry and gravitational wave (GW) signals in models of electroweak baryogenesis (EWBG).
Working in the local thermal equilibrium approximation, we exploit entropy conservation to present efficient algorithms for computing $v_w$, significantly streamlining the calculation.
We then explore the parameter dependencies of $v_w$, focusing on two sample models capable of enabling a strong first-order electroweak phase transition: a $\mathbb{Z}_2$-symmetric singlet extension of the SM, and a model for baryogenesis with CP violation in the dark sector.
We study correlations among $v_w$ and the two common measures of phase transition strength, $\alpha_n$ and $v_n/T_n$.
Interestingly, we find a relatively model-insensitive relationship between $v_n/T_n$ and $\alpha_n$.
We also observe an upper bound on $\alpha_n$ for the deflagration/hybrid wall profiles naturally compatible with EWBG, the exact value for which varies between models, significantly impacting the strength of the GW signals.
In summary, our work provides a framework for exploring the feasibility of EWBG models in light of future GW signals.Speakers: Isaac Wang, Isaac Wang -
11:40
On-shell Recursion in Massive QED and Electroweak Theories 20m
We study the All-Line Transverse (ALT) shift which we developed for on-shell recursion of amplitudes for particles of any mass. We apply the shift to unambiguously derive massive QED and electroweak theory amplitudes using on-shell methods. We discuss the validity of the shift for general theories of spin $\leq$ 1, and illustrate the connection between Ward identity and constructibility for massive spin-1 amplitude under the ALT shift. We show explicitly that the four-point gauge boson contact terms in massive electroweak theory automatically arise after recursive construction, independent of UV completion, and they automatically cancel the terms growing as (energy)$^4$ at high energy. We explore UV completion of the electroweak theory that cancels the remaining (energy)$^2$ terms and impose unitarity requirements to constrain additional couplings. The ALT shift framework allows consistent treatment in dealing with contact term ambiguities for renormalizable massive and massless theories, which we show can be useful in studying real-world amplitudes with massive spinors.
Speaker: Ishmam Mahbub (University of Minnesota Twin Cities) -
12:00
Neutron Stars Shining Neutrinos from a Muonic Fifth Force 20m
Neutron stars typically contain a percent-level population of muons and therefore act as macroscopic sources of the long-range U(1){μ-τ} gauge field linked to a possible muonic fifth force. In the proto-neutron-star phase, muon antineutrinos produced via charged-current weak processes escape the star, leaving behind a net L{μ-τ} charge that builds up a “dark Coulomb” potential. Once the resulting quasi-static electric field becomes strong enough, Schwinger production of neutrino-antineutrino pairs is triggered, gradually neutralizing the charge. By solving the coupled Tolman–Oppenheimer–Volkoff, Poisson, and transport equations, we show that this dynamical screening can significantly reduce the potential depth relative to the no-neutralization case for strong couplings. Nevertheless, the residual field remains strong enough to power a persistent, flavor-specific neutrino afterglow. Such a flux may be within reach of current 10 MeV-neutrino observations, providing a novel probe of a muonic fifth force.
Speaker: Yuxin Liu -
12:20
Charged Lepton Flavor Violation in a Lepton Flavor Portal Matter Model 20m
Increasing attention has been given recently to the theory and phenomenology of portal matter (PM) models — a BSM framework in which the Standard Model (SM) local gauge symmetry group is augmented by a local dark group $U(1)_D$, of which the mediator is the dark photon, and kinetic mixing between $U(1)_D$ and the SM hypercharge is generated at one loop by the PM fields. The case in which the PM are vector-like leptons (VLL) is of particular interest for the study of precision measurements of the leptonic sector. Here we study models with leptonic PM and additional SM vector-like leptons that are neutral under the dark gauge group. We analyze simple models that are consistent with direct and indirect limits on such new states, Moreover, given the current stringent charged lepton flavor violation (CLFV) constraints, and the prospects for further limits or discovery at forthcoming experiments, we examine the bounds on general couplings of the leptonic PM and VLL to the three SM lepton generations within this framework.
Speaker: Ricardo Ximenes (University of Wisconsin-Madison)
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Special Events: Outreach Ideas Brainstorming Grand Terrace
Grand Terrace
Conveners: Lu Lu (University of Wisconsin-Madison), Sarah Perdue (UW-Madison) -
14:00
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15:30
Parallel: Neutrino Physics 3 Room H
Room H
Convener: Dr ADAM LISTER-
14:00
Neutrino-argon cross-section measurements from the MicroBooNE experiment 20m
MicroBooNE is a liquid argon time projection chamber (LArTPC) neutrino detector located along the Fermilab Booster Neutrino Beam and 8 degrees off-axis to the Neutrinos at the Main Injector beam. MicroBooNE collected data from both beams accumulating a large neutrino-argon scattering dataset with a mean neutrino energy of approximately 0.8 GeV. Understanding neutrino-argon interactions is crucial for the next generation of neutrino oscillation experiments including DUNE. MicroBooNE has developed pioneering methodologies and novel reconstruction tools in order to benchmark models at very high sensitivity across the interaction phase space, including for ultra-rare channels. This talk will give an overview of the most recent MicroBooNE neutrino interaction results. These measurements provide invaluable datasets for constraining backgrounds and improving the modelling of neutrino scattering critical for the broader LArTPC neutrino physics program.
Speaker: Liang Liu (Fermi National Accelerator Laboratory) -
14:20
Status and Plans for Measurements of 𝞶-Ar Interactions at ICARUS 20m
The ICARUS experiment, utilizing Liquid Argon Time Projection Chamber (LAr TPC) technology, has been installed at Fermilab in Chicago, Illinois, following its initial operation in Italy and subsequent refurbishment at CERN. ICARUS has successfully been taking physics data at Fermilab since June 2022. While the experiment's primary objective is to function as the far detector of the Short Baseline Neutrino program (SBN), searching for hints of physics beyond three-flavour PMNS neutrino oscillations, ICARUS also offers other diverse physics capabilities, including searches beyond the standard model and measurements of cross-sections. In addition to being exposed to the common Booster Neutrino (BNB) beamline of the SBN experiment, ICARUS receives neutrinos from the Main Injector (NuMI) beam. Due to the off-axis angle between NuMI and ICARUS, coupled with contributions from both pion and kaon decays to neutrino fluxes, interactions of NuMI neutrinos within ICARUS can be detected over a range of several GeV in energy. Measurements of these interactions present unqiue opportunities to infer neutrino interaction cross sections on an argon nuclear target within an energy range that overlaps both the SBN oscillation search and a significnat portion of the DUNE spectrum. This presentation will summarise the current status of ICARUS' muon-neutrino cross-section measurements, highlighting our first analysis where the signal is defined by events with no pions produced in the final state of the interaction and correlations between an outgoing lepton and proton are measured. The ICARUS experiment, utilizing Liquid Argon Time Projection Chamber (LAr TPC) technology, has been installed at Fermilab in Chicago, Illinois, following its initial operation in Italy and subsequent refurbishment at CERN. ICARUS has successfully been taking physics data at Fermilab since June 2022. While the experiment's primary objective is to function as the far detector of the Short Baseline Neutrino program (SBN), searching for hints of physics beyond three-flavour PMNS neutrino oscillations, ICARUS also offers other diverse physics capabilities, including searches beyond the standard model and measurements of cross-sections. In addition to being exposed to the common Booster Neutrino (BNB) beamline of the SBN experiment, ICARUS receives neutrinos from the Main Injector (NuMI) beam. Due to the off-axis angle between NuMI and ICARUS, coupled with contributions from both pion and kaon decays to neutrino fluxes, interactions of NuMI neutrinos within ICARUS can be detected over a range of several GeV in energy. Measurements of these interactions present unqiue opportunities to infer neutrino interaction cross sections on an argon nuclear target within an energy range that overlaps both the SBN oscillation search and a significnat portion of the DUNE spectrum. This presentation will summarise the current status of ICARUS' muon-neutrino cross-section measurements, highlighting our first analysis where the signal is defined by events with no pions produced in the final state of the interaction and correlations between an outgoing lepton and proton are measured.
Speaker: Minerba Betancourt -
14:40
Hadron production measurements for neutrino experiments at NA61/SHINE 20m
Current and future accelerator-based neutrino experiments require precise estimations of their (anti)neutrino fluxes. The (anti)neutrino flux uncertainty primarily arises from insufficient precision in understanding primary and secondary hadron-nucleus interactions in the target and beamline materials. The SPS Heavy Ion and Neutrino Experiment (NA61/SHINE) at CERN has developed a dedicated program to measure hadron production in various hadron-nucleus interactions using thin and replica targets for many neutrino experiments. Previous measurements from NA61/SHINE have greatly reduced the (anti)neutrino flux uncertainty in the T2K experiment. This contribution will present the recent results and ongoing hadron production measurements in NA61/SHINE, the impact of recent NA61/SHINE results on reducing flux uncertainty in the DUNE experiment, as well as our plans following the Long Shutdown 3 of the accelerator complex at CERN.
Speaker: Lu Ren (University of Colorado Boulder (US)) -
15:00
DeepCore sensitivity to Non Standard neutrino Interactions in the Earth 20m
The discovery of non-zero neutrino masses guarantees the existence of particles and interactions beyond the Standard Model of particle physics. Possible observational signatures of new neutrino physics include deviations in oscillation probabilities predicted by the PMNS framework; neutrino interactions with undiscovered heavy gauge bosons—Non-Standard Interactions (NSI)—coupling to lepton numbers could modify these probabilities. IceCube DeepCore's sensitivity to atmospheric neutrinos, with oscillation baselines spanning the Earth's diameter, makes it an ideal detector to search for NSI effects in the Earth. We adopt a model-independent parameterization that allows for multiple NSI modes simultaneously and present DeepCore's sensitivity to NSI using 9.28 years of data.
Speaker: SAMYAK JAIN
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Parallel: Searches with Jets Room E
Room E
Convener: Robert Harris (Fermi National Accelerator Lab. (US))-
14:00
Multi-jet probes of new particles at the LHC: theory input 30m
New particles with masses in the TeV range, including vectorlike quarks, diquark scalars, colorons, and others, may produce signals at the LHC with high transverse momentum jets. I will discuss various predictions for such signals in theories beyond the Standard Model. Depending on the couplings of the heavy particles, additional signals involving highly-boosted top quarks would appear as jets with multi-prong substructure.
Speaker: Bogdan Dobrescu -
14:30
Searches in CMS for new physics in final states with jets 20m
Searches in CMS for new physics in final states with jets
Many new physics models such as compositeness, extra dimensions, extended Higgs sectors, supersymmetric theories, and dark sector extensions, are expected to manifest themselves in the final states with hadronic jets. This talk presents searches in CMS for new phenomena in the final states that include jets, focusing on the recent results obtained using the full Run-2 and partial Run-3 data-set collected at the LHC.
Speaker: Divya Gadkari (Rutgers State Univ. of New Jersey (US)) -
14:50
Searches for dijet resonances with the ATLAS detector 20m
Many theories beyond the Standard Model (SM) predict new physics phenomena that decay hadronically to dijet or multijet final states. This talk summarises the latest results from the ATLAS detector using the Run-2 dataset, involving these final states.
Speaker: Wasikul Islam (University of Wisconsin-Madison (US)) -
15:10
Searches for new particles using jets, photons or missing energy using the ATLAS detector 20m
Many theories beyond the Standard Model (SM) predict new physics phenomena that decay to photons, jets or missing energy. This talk summarises the latest results from the ATLAS detector using the Run-2 dataset, involving these final states. A number of sensitive kinematics are explored, including the invariant mass and angular distributions.
Speaker: Hector De La Torre Perez (Northern Illinois University (US))
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Parallel: Exotic Searches 1 Room KLOP
Room KLOP
Convener: Matthew Daniel Citron (University of California Davis (US))-
14:00
Anomaly triggers for exotic searches 20mSpeaker: Jannicke Pearkes (University of Colorado Boulder (US))
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14:20
Stealth and RPV SUSY searches with CMS 20m
Since the classic searches for supersymmetry under R-parity conserving scenarios have not given any strong indication for new physics yet, more and more supersymmetry searches are carried out on a wider range of supersymmetric scenarios. This talk focuses on searches looking for signatures of stealth and R-parity-violating supersymmetry.
Speaker: Nadja Strobbe (University of Minnesota (US)) -
14:40
Searches in CMS for long-lived particles and other non-conventional signatures 20m
Searches in CMS for long-lived particles and other non-conventional signatures
Speaker: Jingyu Luo (Brown University (US)) -
15:00
Physics results with the CMS Precision Proton Spectrometer and projections for the HL-LHC with PPS2 20m
Physics results with the CMS Precision Proton Spectrometer and projections for the HL-LHC with PPS2
Speaker: Gustavo Gil Da Silveira (Universidade do Estado do Rio de Janeiro (BR))
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Parallel: Hadron Physics 2 Room J
Room J
Convener: Matthew Herndon (University of Wisconsin Madison (US))-
14:00
Charmonium(-like) states at BESIII 20m
In recent years, a number of charmonium-like states have been observed
above the open-charm threshold in various experiments. Their properties often go
against our expectations for regular charmonium states, making their
interpretation difficult. With BESIII, we are a leading contributor to the
experimental studies of the so-called XYZ states – studying Y-states directly in
e+e- annihilation, while producing X and Z states in hadronic and radiative
transitions. In this talk, recent highlights from the BESIII program on
charmonium(-like) states above the open-charm threshold will be discussed.Speakers: Ben Moses, Benjamin Moses -
14:20
Hadron spectroscopy at Belle and Belle II 20m
The Belle and Belle II experiments have collected a $1.6 ~\mathrm{ab}^{-1}$ sample of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. In particular, the Belle II experiment collected a 19.2 fb$^{-1}$ sample of data at centre-of-mass energies near the $\Upsilon(10753)$ resonance. We present several results related to the following processes: $e^+e-\to \Upsilon(nS)\eta$, $e^+e-\to \gamma X_b(\chi_{bJ}\pi^+\pi^-)$, and $e^{+}e^{-}\to\chi_{bJ}(1P) \gamma$. These results provide additional information about the nature of the $\Upsilon(10753)$ resonance and nearby structures. In addition, we present a measurement of the $B^{0}$ and $B^+$ meson mass difference and a measurement of $\sigma\left(e^+ e^-\to J/\psi p\bar{p}\right)$ over a range of centre-of-mass energies accessed via initial-state radiation.
Speakers: Martin Bartl, Martin Frederik Bartl (Max Planck Institute for Physics) -
14:40
Recent results on (semi)-leptonic D decays and Charm baryons at BESIII 30mSpeakers: Alex Gilman, Alex Gilman
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Parallel: Higgs 1 Room F
Room F
Convener: Maria Cepeda (CIEMAT)-
14:00
Non-resonant HH and higgs-self couplings measurements by ATLAS 20m
In the Standard Model, the ground state of the Higgs field is not found at zero but instead corresponds to one of the degenerate solutions minimising the Higgs potential. In turn, this spontaneous electroweak symmetry breaking provides a mechanism for the mass generation of nearly all fundamental particles. The Standard Model makes a definite prediction for the Higgs boson self-coupling and thereby the shape of the Higgs potential. Experimentally, both can be probed through the production of Higgs boson pairs (HH), a rare process that presently receives a lot of attention at the LHC. In this talk, the latest HH searches by the ATLAS experiment are reported, with emphasis on the results obtained with the full LHC Run 2 dataset at 13 TeV. Non-resonant HH search results are interpreted both in terms of sensitivity to the Standard Model and as limits on the Higgs boson self-coupling and the quartic VVHH coupling. The Higgs boson self-coupling can be also constrained by exploiting higher-order electroweak corrections to single Higgs boson production. A combined measurement of both results yields the overall highest precision, and reduces model dependence by allowing for the simultaneous determination of the single Higgs boson couplings. Additionally, extrapolations of recent HH results towards the High Luminosity LHC upgrade are also discussed. Many new physics models predict the existence of resonances decaying into two bosons, including the Higgs boson or new scalar S bosons making these important signatures in the search for new physics. Searches for HH or SH resonances have been performed in various final states. In some of these searches, jet substructure techniques are used to disentangle the hadronic decay products in highly boosted configurations.Recent ATLAS searches with Run 2 data collected at the LHC and explains the experimental methods used, including vector- and Higgs-boson-tagging techniques are presented.
Speaker: Luis Falda Coelho (Laboratory of Instrumentation and Experimental Particle Physics (PT)) -
14:20
Di-Higgs searches at CMS 20m
The measurement of the production of Higgs boson pairs (HH) at the LHC allows the exploration of the Higgs boson interaction with itself and is thus a fundamental test of the Standard Model theory and has a key role in the determination of the Higgs boson nature. The most recent results from the CMS collaboration on measurements of non-resonant HH production using different final states and their combination using the data set collected by the CMS experiment will be presented.
Speaker: Dr Rui Zou (Cornell University (US)) -
14:40
Recent results on measurements of the Higgs boson in ATLAS 20m
The event rates and kinematics of Higgs boson production and decay processes at the LHC are sensitive probes of possible new phenomena beyond the Standard Model (BSM). This talk presents the most recent results in the measurements of Higgs boson production and decay rates, obtained using the full Run 2 and partial Run 3 pp collision dataset collected by the ATLAS experiment at 13 TeV and 13.6 TeV. These include total and fiducial cross-sections for the main Higgs boson processes as well as branching ratios into final states with bosons and fermions. Additionally, several rare Higgs boson processes predicted in the SM, such as decays to a Z boson and a photon, and decays to a pair of muons will be discussed. The observation of one of these processes could open new windows for the study of Higgs boson couplings, or provide evidence for physics beyond the Standard Model.
Speaker: Brendon Bullard (SLAC National Accelerator Laboratory (US)) -
15:00
Self Consistent Thermal Resummation: A Case Study of the Phase Transition in 2HDM 20m
An accurate description of the scalar potential at finite temperature is crucial for studying cosmological first-order phase transitions (FOPT) in the early Universe. At finite temperatures, a precise treatment of thermal resummations is essential, as bosonic fields encounter significant infrared issues that can compromise standard perturbative approaches. The Partial Dressing (or the tadpole resummation) method provides a self consistent resummation of higher order corrections, allowing the computation of thermal masses and the effective potential including the proper Boltzmann suppression factors and without relying on any high-temperature approximation. We systematically compare the Partial dressing resummation scheme results with the Parwani and Arnold Espinosa (AE) ones to investigate the thermal phase transition dynamics in the Two-Higgs-Doublet Model (2HDM). Our findings reveal that different resummation prescriptions can significantly alter the nature of the phase transition within the same region of parameter space, confirming the differences that have already been noticed between the Parwani and AE schemes. Notably, the more refined resummation prescription, the Partial Dressing scheme, does not support symmetry non-restoration in 2HDM at high temperatures observed using the AE prescription. Furthermore, we quantify the uncertainties in the stochastic gravitational wave (GW) spectrum from an FOPT due to variations in resummation methods, illustrating their role in shaping theoretical predictions for upcoming GW experiments. Finally, we discuss the capability of the High-Luminosity LHC and proposed GW experiments to probe the FOEWPT-favored region of the parameter space.
Speaker: Dr Subhojit Roy (Argonne National Laboratory)
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Parallel: Instrumentation 2 Room I
Room I
Convener: Tae Jeong Kim (Hanyang University (KR))-
14:00
Operational Experience and Performance with the ATLAS Pixel detector at the Large Hadron Collider at CERN 20m
The tracking performance of the ATLAS detector relies critically on its 4-layer Pixel
Detector, with a sensitive area of ~1.9 m2 and 92 million pixels. Its original part,
consisting in 3 layers of planar pixel sensor is continuously operating since the start
of LHC collisions in 2008, while Its innermost layer, the Insertable B Layer (IBL) at
about 3 cm from the beam line, was installed in 2015 before the start of LHC Run2
and consists of both planar and 3D pixel sensors, with FE-I4 readout frontends at
130nm CMOS technology.
As the closest detector component to the interaction point, this detector is subjected
to a significant amount of radiation over its lifetime. At present, before the start of
2025 Run3 LHC collisions, ATLAS Pixel Detector on innermost layers is operating
after integrating fluence of O(10**15) 1 MeV n_eq cm-2.
In this talk the key status and performance metrics of the ATLAS Pixel Detector are
summarised, putting focus on performance and operating conditions at a over
performing LHC, with special emphasis to radiation damage and mitigation
techniques adopted, with prediction of their evolution until the end of LHC Run3 in
2026.
These results provide useful indications for the optimisation of the operating
conditions for the new generation of pixel trackers under construction for HI-LHC
upgrades.Speaker: Jack Lindon (CERN) -
14:20
Phase-2 Upgrade of the ATLAS Inner Tracker 20m
The ATLAS experiment is currently preparing for an upgrade of the Inner Tracking for High-Luminosity LHC operation, scheduled to start in 2030. The radiation damage at the maximum integrated luminosity of 4000/fb implies integrated hadron fluencies over 2x1016neq/cm2 and tracking in a very dense environment call for a replacement of the existing Inner Detector. An all-silicon Inner Tracker (ITk) is proposed with a pixel detector surrounded by a strip detector. After an extensive prototyping phase, all the institutes involved in the ITk are currently in pre-production phase, moving toward production mode. In this contribution we present the design of the ITk Detector and its expected performance. An overview of the current status of the various detector components, both pixel, strip and the other common items, focusing on the preparation for production, with its more challenging aspects, will be summarized.
Speaker: Angira Rastogi (Lawrence Berkeley National Lab. (US)) -
14:40
The ePIC Silicon Vertex Tracker: Design and Status 20m
The Electron-Ion Collider (EIC), the future facility at Brookhaven National Laboratory (Upton, NY, USA), will enable precision studies of the partonic structure of nucleons and nuclei across a broad range of Bjorken-x and four-momentum transfer squared Q2, with center-of-mass energies from 20 to 140 GeV. Leveraging high luminosity (1034 cm−2s−1) and polarized beams (electrons, protons, and deuterons up to ~70%), the ePIC detector is designed to fully exploit the EIC's physics potential.
A crucial component of the ePIC detector is the Silicon Vertex Tracker (SVT), responsible for high-precision tracking and vertex reconstruction, particularly important for measuring the electron momentum, and, for example, identifying short-lived particles such as charmed mesons with decay lengths on the order of 100 µm. The SVT consists of three sub-detectors: the Inner Barrel (IB), the Outer Barrel (OB), and Forward/Backward Discs. All rely on Monolithic Active Pixel Sensor (MAPS) which combine high granularity, low power consumption, and minimal material budget.
The IB comprises three innermost layers (L0–L2), utilizing the MOSAIX sensor developed by ALICE for the ITS3 upgrade in a commercial 65 nm CMOS technology with stitching to cover an area close to the whole wafer, and thinned down to 50 um to allow the bending in a cylindrical shape around the beam pipe. The OB, forming layers L3–L4, employs a version of the same sensor (EIC-LAS) with modified size and data interface, integrated into a classical stave structure. In the forward regions, EIC-LAS based lightweight discs have been developed to cover the forward/backward region of detection while minimizing material.
This presentation will provide an overview of the SVT development and design.Speaker: Rosario Turrisi (Universita e INFN, Padova (IT)) -
15:00
Precision timing at the HL-LHC with the CMS MIP Timing Detector: current progress on validation and production 20m
During the High Luminosity phase of LHC, up to 200 proton-proton collisions per bunch crossing will bring severe challenges for event reconstruction. To mitigate pileup effects, an extended upgrade program of the CMS experiment is expected. A new timing layer, the MIP Timing Detector (MTD), will be integrated between the tracker and the calorimeters. With a time resolution of 30-60 ps, the MTD will enable 4D vertexing and it will bring significant improvements in track-to-vertex association and object identification. The MTD is composed of two subsystems based on different technologies: the Barrel Timing Layer (BTL) consists of LYSO:Ce scintillating crystals readout by SiPMs and the Endcap Timing Layer (ETL) is made of Low Gain Avalanche Detectors. The BTL is currently under production, while ETL sensor prototyping and validation are ongoing. Recent system tests have confirmed the performance of the full acquisition chain. This talk will provide an overview of the MTD design, along with the physics motivation and the current status of BTL construction and ETL development.
Speaker: Simona Palluotto (Università degli Studi & INFN Milano-Bicocca (IT))
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Parallel: Quark Flavor 2 Room G
Room G
Convener: Alexey Petrov (University of South Carolina)-
14:00
Heavy flavour hadron production and decays at ATLAS 20m
This talk will present recent results from the ATLAS experiment on measurement of beauty and charm hadron production and decay properties. Measurements of D meson production and of associated production of $J/psi$ with other objects at $\sqrt{s} = 13$ TeV will be reported, as well as measurements of $B^0$ meson lifetime and of properties of $B^0_{(s)}\to\mu^+\mu^-$ rare decays. Parallel session: Quark Flavor Measurements of $J/\psi$, $\psi(2S)$, $D_s$, and $B^+$ differential production cross sections at 13 TeV will be reported. Results on the associated production of the $J/\psi$ with other particles will be shown. Measurements of the $B^0$ lifetime and the $B_s \to \mu \mu$ effective lifetime will be presented.
Speaker: Ioannis Michail Maniatis (Weizmann Institute of Science (IL)) -
14:20
Measurement of B meson production fractions in proton-proton collisions at 13 TeV using hadronic open-charm and charmonium decays 20m
This talk presents the first CMS measurements of the production fractions of B⁺, B⁰, and B⁰ₛ mesons in proton-proton collisions at 13 TeV. The analysis is based on a dedicated 2018 data set collected with high-rate triggers, which enables the reconstruction of hadronic open-charm decays of B mesons (e.g., B → πD), where the D mesons decay fully hadronically. These channels allow precise measurements of the production fraction ratios as functions of B meson kinematics within the CMS acceptance.
In addition to the measurement of the ratio of production fractions, we report differential measurements based on exclusive charmonium decays (B → XJ/ψ, with X = K, K*(892)⁰, or ϕ(1020)), which provide new insight toward understanding the pT dependence of B meson production, as indicated by recent results from LHCb and CMS. We also present a measurement of the fd/fu ratio to test isospin symmetry in B production, finding results consistent with isospin invariance within experimental uncertainties.
Speaker: Taeun Kwon (Brown University (US)) -
14:40
Measurements of semileptonic and leptonic $B$ decays at Belle and Belle II 20m
The Belle and Belle II experiments have collected a combined sample of 1.2 ab$^{-1}$ of $e^+ e^-\to B\bar{B}$ collisions at a centre-of-mass energy corresponding to the $\Upsilon(4S)$ resonance. These data, with low particle multiplicity and constrained initial state kinematics, are an ideal environment for studying semileptonic and leptonic decays of the $B$ meson. Combined with theoretical inputs, measurements of both inclusive and exclusive semileptonic decays yield information about the Cabibbo-Kobayashi-Maskawa matrix elements $V_{cb}$ and $V_{ub}$. Our latest results based on the Belle II data set are reviewed. We also present the first measurement of $B^{+}\to \tau^{+}\nu$ from Belle II and a search for $B^+\to \mu^+\nu$ using the combined Belle and Belle~II samples. These decays provide constraints on beyond-the-standard model physics and provide alternative measurements of $V_{ub}$ that complement those from semileptonic decay.
Speaker: Boyang Zhang -
15:00
Recent results from LHCb on charged-current decays of b-hadrons 20m
Semileptonic b-hadron decays proceed via charged-current interactions and provide powerful probes for testing the Standard Model and searching for New Physics effects. The advantages of studying such decays include the large branching fractions and reliable calculations of the hadron matrix elements. Several SM features may be studied, such as the ratios of branching fractions, CKM parameters, properties of b−hadron production, form factor parameters and Wilson coefficients. In this contribution, recent LHCb results on this topic are presented.
Speaker: Ching-Hua Li (Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France)
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Afternoon Break 30m
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Plenary: Tuesday Lecture Hall
Lecture Hall
Convener: Bogdan Dobrescu- 16:00
- 16:30
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Electron Ion Collider 30mSpeakers: Abhay Deshpande (Stony Brook University), Abhay Deshpande
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Special Events: Walk to Campus
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Community Events: Mark Thomson's Public Lecture: Particle Physics: Uncovering the Secrets of the Universe Memorial Union, UW-Madison (Great Hall)
Memorial Union, UW-Madison
Great Hall
800 Langdon St, Madison, WI 53706Convener: Prof. Eric Wilcots (UW-Madison)-
18:30
Particle Physics: Uncovering the Secrets of the Universe 1h
The lecture will explore the cutting-edge frontier of particle physics and our understanding of the universe at its most fundamental level – ranging from understanding dark matter to exploring the early universe. It will focus on the world’s largest and most ambitious particle physics collider – the Large Hadron Collider at CERN – discussing what we have discovered at some of the remaining “big questions”. The lecture will also explore the plans for the next large particle physics projects in Europe and the US and will highlight the broader socio-economic impacts of large-scale scientific investments such as large collider projects.
Speaker: Mark Thomson (CERN)
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Plenary: Wednesday Lecture Hall
Lecture Hall
Convener: Prof. Gary Shiu (University of Wisconsin-Madison)-
09:00
Status of string theory 30m
In the past decades, String Theory has emerged as the prime candidate for the unification of particle physics with quantum gravity. It has shed light on important fundamental questions of theoretical physics, such as the microscopic structure of black holes and the geometric origin of particle physics. We focus on the important geometric role that branes, extended objects in String Theory play in deriving the Standard Model of particle physics. We further highlight developments in deriving particle physics from F-theory, a geometric domain of String Theory at finite string coupling, and systematic exploration of the landscape of the (quadrillion) Standard Models with three families of quarks and leptons. Time permitting, we also point out recent insights into geometric origin of higher symmetry structures for quantum field theories derived from String Theory.
Speaker: Mirjam Cvetic (University of Pennsylvania) -
09:30
Latest Cosmological Results from the Dark Energy Spectroscopic Instrument 30m
The Dark Energy Spectroscopic Instrument (DESI) is a groundbreaking cosmology experiment measuring the spectra of tens of millions of extragalactic galaxies and quasars. Its unprecedented capabilities enable the creation of the most detailed three-dimensional maps of the Universe produced to date. In March 2025, DESI released its latest major cosmological analysis, focusing on the measurement of Baryon Acoustic Oscillations (BAO), a so-called cosmological standard ruler. By measuring the BAO scale over cosmic time, DESI can put stringent constraints on the expansion history of the Universe. This, in turn, provides new insights into the properties of dark energy, spatial curvature, and neutrino properties. Intriguingly, DESI's first BAO analysis in 2024 hinted at potential deviations of dark energy from a cosmological constant and a surprisingly low upper limit on the sum of the neutrino masses. In this talk, I will give an overview of the most recent results, how to interpret them, and discuss what to expect from DESI in the future.
Speaker: Prof. Johannes Lange (American University) -
10:00
CMB measurements and prospects 30m
The next frontier for measurements of the cosmic microwave background (CMB) will be to characterize is polarization, which will give several new windows into the physics of the early Universe. On degree angular scales, the amplitude of the B-mode polarization gives a constraint on the energy scale of cosmic Inflation, with measurements in the next several years improving constraints by an order of magnitude. On intermediate angular scales, the CMB polarization anisotropy gives constraints on a range of physics, including the abundance of light relic particle species and the mass of the neutrino. Comparing the allowed volume of likelihood space for cosmological parameters, these same CMB measurements will reduce this volume by over a factor of 100 over the next few years. I will describe the experimental landscape pushing these new frontiers of CMB measurements, focusing on the South Pole Telescope (SPT-3G, SPT-3G+) and the BICEP Array (BA) experiment, which combined form the South Pole Observatory (SPO), and also describe recent and upcoming results.
Speaker: Bradford Benson (Fermi National Accelerator Laboratory)
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Morning Break 30m
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Parallel: Astrophysics 1 Room J
Room J
Convener: Marco Ajello (Clemson University)-
11:00
Connecting the Dots: Neutrino Emission in TXS 0506+056 and NGC 1068 20m
In this talk, we propose an alternative explanation for the neutrino emission observed by IceCube from the active galactic nucleus TXS 0506+056. We argue that these neutrinos could originate near the core of TXS 0506+056 instead of the blazar jet, akin to the mechanism behind the neutrino flux from NGC 1068 and NGC 4151.
Speaker: Arifa Khatee Zathul (University of Wisconsin-Madison) -
11:20
Latest results on the photon searches at the Pierre Auger Observatory [Zoom] 20m
The Pierre Auger Observatory is the world’s largest air-shower detector, providing unmatched exposure to photons with energies above $5\times10^{16}$ eV.
Since the beginning of data collection nearly two decades ago, numerous photon searches have been carried out using the detection systems of the Observatory.
These efforts have resulted in the most stringent upper limits on the diffuse photon flux, placing strong constraints on current models of the origin of ultra-high-energy cosmic rays.
They also highlight the significant role in multi-messenger astronomy at the highest energies of the Observatory.
In this contribution, we present an overview of the ongoing efforts to identify high-energy photons in the data collected by the Pierre Auger Observatory.
The latest results from diffuse photon flux searches will be shown, along with follow-up analyses of photons potentially associated with transient events, such as gravitational wave detections.Speaker: Pierpaolo Savina (Gran Sasso Science Institute) -
11:40
Multimessenger Physics at the Pierre Auger Observatory: Probing the Universe and Fundamental Interactions [Zoom] 20m
Multimessenger observations provide a powerful tool to explore the most energetic and extreme phenomena in the Universe. The Pierre Auger Observatory contributes to this effort through the detection of cosmic rays, photons, and neutrinos, using extensive air showers to identify the nature and origin of the primary particles. Among these messengers, ultra-high-energy photons play a privileged role due to their sensitivity to both astrophysical source models and possible new physics.
Analyses conducted during Phase I of the Observatory have set the most stringent upper limits to date on diffuse photon fluxes over a wide energy range. These results disfavor top-down scenarios, constrain the properties of super-heavy dark matter candidates, and provide important tests of fundamental physics, including scenarios that involve violations of Lorentz invariance.
Complementary searches have been performed in directional and temporal coincidence with gravitational wave events, establishing the first ever limits on ultra-high-energy photons associated with compact binary mergers. These efforts are now being expanded within the Phase II configuration of the Observatory, following the completion of the AugerPrime upgrade. The enhanced instrumentation, including surface and underground detectors, radio antennas, and scintillator arrays, improves the capability to separate photon and hadron primaries and opens new avenues for investigating the most energetic processes in the cosmos.Speaker: Francesco Salamida -
12:00
Multi-wavelength Analysis of Unassociated 1LHAASO Sources using HAWC Observatory 20m
Ultra-High-Energy gamma-ray sources can be potentially classified as Galactic PeVatrons, that accelerate cosmic-rays up to PeV energies. These accelerated cosmic-rays can interact via hadronic processes with a nearby ambient molecular cloud, resulting in the production of gamma-rays and neutrinos. The Large High Altitude Air Shower Observatory (LHAASO) collaboration published a catalog of sources in which they categorized 14 sources as "unassociated/associated only with a GeV counterpart". These sources are not extensively observed at other wavelengths, and some are opaque indicating a potential obscuration by a molecular gas cloud. In this work, we will present a preliminary analysis of the 4 dark sources using 2860 days of HAWC data and 16 years of Fermi-LAT data. We show that this analysis could advance our understanding of such obscured sources and provide a direct probe of cosmic-ray acceleration in the galaxy.
Speaker: Dr Rishi Babu (Michigan State University) -
12:20
Constraining Galactic Cosmic Ray Models with a Multi-Messenger Analysis of the Diffuse Emission 20m
The origin of Galactic Cosmic Rays (GCRs) up to the PeV energy scales remains a significant question in astrophysics. As charged particles, GCRs are deflected by galactic magnetic fields, obscuring their sources. However, the interactions of GCRs with interstellar gas produce a diffuse flux of high-energy gamma rays and neutrinos. This talk will investigate the origins of GCRs by performing a comprehensive multi-messenger analysis. We will employ a range of theoretical models (~80 in total) that describe neutral pion decay to predict the diffuse gamma-ray emission from the Milky Way. For each model, a corresponding neutrino flux will be derived. These predictions will be tailored to specific regions of the sky, including the inner (25°< l < 100°, ∣b∣ < 5°) and outer (50°< l < 200°, ∣b∣ < 5°) galaxy.
The resulting gamma-ray and neutrino spectra will be compared with the latest observational data from LHAASO and IceCube. This comparative study aims to constrain GCR propagation models and to search for potential unresolved source populations, such as TeV Halos. We will present the status of this comparison and discuss the implications for the future of GCR physics.Speaker: Alisha Roberts (University of Wisconsin-Madison)
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Parallel: Dark Sectors at Colliders 2 Room KLOP
Room KLOP
Convener: Lisa Everett-
11:00
Search for $B$ Mesogenesis and Dark matter at $BABAR$. 20m
We present the most recent $BABAR$ searches for reactions that could simultaneously explain the presence of dark matter and the matter-antimatter asymmetry in the Universe. This scenario predicts exotic $B$-meson decays into an ordinary-matter baryon and a dark-sector anti-baryon $\psi_D$ with branching fractions accessible at the $B$ factories.
The results are based on the full data set of about 430 $\text{fb}^{-1}$ collected at the $\Upsilon(4S)$ resonance by the $BABAR$ detector at the PEP-II collider.
We search, in particular, for decays like $B\to\psi_{D} {\cal B}$ where $\cal{B}$ is a baryon (proton, $\Lambda$, or $\Lambda_c$). The hadronic recoil method has been applied with one of the $B$ mesons from $\Upsilon(4S)$ decay fully reconstructed, while only one baryon is present in the signal $B$-meson side. The missing mass of signal $B$ meson is considered as the mass of the dark particle $\psi_{D}$. Stringent upper limits on the decay branching fraction are derived for $\psi_D$ masses between 0.5 and 4.3 GeV/c$^2$.Speaker: Sophie Middleton (Caltech) -
11:20
Long lived particle searches with FASER 20m
The FASER experiment at the LHC is designed to search for light, weakly-coupled new particles, and to study high-energy neutrinos. The experiment has been running since 2022, and has collected nearly 200/fb of pp collision data. FASER has released a search for long-lived dark photons, and long lived axion-like-particles (also interpreted in several other scenarios). This talk will summarize the long-lived BSM particle search program and discuss future prospects.
Speaker: Ansh Desai (University of Oregon (US)) -
11:40
FORMOSA: looking forward to millicharged particles at the LHC 20m
The FORMOSA detector at the proposed Forward Physics Facility is a scintillator-based experiment designed to search for signatures of "millicharged particles" produced in the forward region of the LHC. This talk will cover the challenges and impressive sensitivity of the FORMOSA detector, expected to extend current limits by over an order of magnitude. A pathfinder experiment, the FORMOSA demonstrator, was installed in the FASER cavern at the LHC in early 2024 and has been collecting collisional data. Results from this demonstrator and important implications for the full detector design will be shown
Speaker: Jacob Henry Steenis (University of California Davis (US)) -
12:00
Heavy QCD axion at Muon Collider 20m
We study the physics potentials of heavy QCD axions at 3/10 TeV muon colliders (MuC). These heavy QCD axions differ from typical ALPs as they solve the Strong CP puzzle, and their phenomenology is driven by the aGG couplings. Different realizations of heavy QCD axions have different implications, and we show comprehensively how muon colliders can uniquely probe them with a huge parameter space.
Speaker: Peiran Li (University of Minnesota) -
12:20
Search for the X17 particle with the PADME experiment 20m
The PADME experiment at the Frascati National Laboratory of INFN has performed a
search for the hypothetical X17 particle, by observing the product of the collisions
of the positron beam from the DAΦNE LINAC on a diamond fixed target.
The beam energy has been varied in the range
265–300 MeV, corresponding to values of √s between 16.4 and 17.5 MeV,
completely covering the the CoM region identified by the
ATOMKI collaboration as significant for observing the postulated X17 particle.
The result of the analysis shows an about 2-sigma excess corresponding to the mass indicated by
the ATOMKI experiment. A new data taking campaign, with an improved detector is
planned to start in the summer of 2025, with the aim of pushing forward the
sensitivity of the search.Speaker: Elisa Di Meco (INFN e Laboratori Nazionali di Frascati (IT))
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Parallel: EWK Physics 2 Room F
Room F
Convener: Juergen Reuter (DESY Hamburg, Germany)-
11:00
Polarization in VV production in CMS 20m
The study of vector boson (V = W, Z) polarization in diboson production serves as an important test of electroweak symmetry breaking mechanism and can be used as a tool to search for new physics effects. This is also a first step to studying longitudinal polarization in the rare process of vector boson scattering. In this talk, we present recent measurements of polarization observables in VV production using data collected by the CMS detector at the LHC. The analyses explore angular distributions and polarization fractions of the W and Z bosons in final states with leptons and missing transverse energy. We discuss the techniques used to extract polarization information and compare the results with theoretical predictions from the Standard Model.
Speaker: Susmita Mondal (University of Wisconsin Madison (US)) -
11:20
Recent results on EWK physics at the LHCb 20m
The Electroweak sector of the Standard Model is currently being scrutinized with a extraordinary level of detail. Many of the Electroweak and QCD processes can be computed nowadays at several orders in perturbation theory, reaching an unprecedented precision. Thanks to the increasing sizes of the data samples collected at LHCb, together with the developments on the theory side, it is possible to perform high precision measurements that push the boundaries of our understanding of fundamental interactions. The LHCb detector offers unique capabilities in order to perform high precision measurements of QCD and EW observables in the high pseudorapidity region at the LHC. In this environment, certain quantities, like the weak-mixing angle, are less affected by uncertainties from the parton distribution functions, and the more simple geometry of the detector facilitates the evaluation of experimental biases. The LHCb coverage also provides the opportunity to constrain theory uncertainties when combining the measurements with the other experiments at the LHC, allowing to obtain an almost full coverage of the proton-proton interactions.
In this talk, the most recent results of EW measurements performed at LHCb will be covered, with a special dedication to the latest Z boson mass result, the study of the effective weak-mixing angle and the measurement of the W boson mass.Speaker: Federico Leo Redi (Università degli Studi e INFN Milano (IT)) -
11:40
Precision measurements of Drell-Yan processes in ATLAS 20m
Precision measurements of Drell-Yan processes (both on-shell and off-shell W and Z bosons) offer key input to improve on the understanding of QCD and the accuracy of PDFs. In addition, these measurements are deeply linked with the achievements in electroweak parameter precision tests (such as W boson mass measurement). This talk will summarize recent achievements from ATLAS on this topic.
Speaker: Daniel Lewis (Centre National de la Recherche Scientifique (FR)) -
12:00
Diboson production in CMS 20m
This talk covers recent CMS results on multiboson production processes, including WZ and WW cross sections at 13.6 TeV and Run 2 measurements 13 TeV of ZZ+jets, WWss, and Wγ. These channels test the structure of the electroweak sector beyond inclusive measurements and probe new physics via anomalous gauge couplings and effective field theory.
Speaker: Isaac Telford Ehle (Centre National de la Recherche Scientifique (FR)) -
12:20
W and Z boson measurements at CMS 20m
This talk presents the latest precision measurements of W and Z boson production and decay at CMS using data from Run 2 and Run 3. These include the most recent determinations of the W boson mass, the weak mixing angle, and W and Z cross sections. These results provide stringent constraints on Standard Model parameters and are sensitive probes for potential new physics.
Speaker: David Walter (Massachusetts Inst. of Technology (US))
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Parallel: Future Colliders 2 Lecture Hall
Lecture Hall
Convener: Prof. Kevin Black (University of Wisconsin-Madison)-
11:00
The IDEA detector concept for FCC-ee 20m
The electron-positron stage of the Future Circular Collider (FCC-ee) provides exciting opportunities that are enabled by next generation particle physics detectors. We present IDEA, a detector concept optimized for FCC-ee and composed of a vertex detector based on DMAPS, a very light drift chamber, a silicon wrapper, a high resolution dual-readout crystal electromagnetic calorimeter, an HTS based superconducting solenoid, a dual-readout fiber calorimeter, and three layers of muon chambers embedded in the magnet flux return yoke. In particular, we discuss the physics requirements and the technical solutions chosen to address them. We describe the detector R&D currently in progress, test-beam results, and show the expected performance on a selection of key physics benchmarks.
Speaker: Wonyong Chung (Princeton University (US)) -
11:20
MUSIC: a detector concept for 10 TeV $\mu^+\mu^-$ collisions 20m
The full exploitation of the physics potential of a multi-TeV muon collider will ultimately lie in the detector's ability to cope with unprecedented levels of machine-induced backgrounds. This contribution introduces the MUSIC (MUon System for Interesting Collisions) detector concept and presents its performance in the context of $\sqrt{s}$ = 10 TeV muon-antimuon collisions. The MUSIC detector is designed to mitigate machine-induced background effects while maintaining high efficiency and accuracy in the reconstruction of physics events, in particular in the Higgs boson sector and in the search for new physics. It features an advanced all-silicon tracking system, a semi-homogeneous lead-fluorite crystal electromagnetic calorimeter, a iron-scintillator sampling hadronic calorimeter, and a superconducting magnet providing a 5 T magnetic field.
The contribution presents the results of detailed detector simulations including the dominant machine-induced backgrounds. The results demonstrate promising tracking efficiency, photon, electron and jet reconstruction capabilities, and jet flavor identification performance, highlighting the strong potential of the detector for high-energy muon collider experiments.Speaker: Massimo Casarsa (INFN, Trieste (IT)) -
11:40
CyberPFA: Particle Flow Algorithm for Crystal Bar ECAL [Zoom] 20m
Precision measurements of Higgs, W, and Z bosons at future lepton colliders demand jet energy reconstruction with unprecedented accuracy. The particle flow (PFA) approach has proven to be highly effective in achieving the required jet energy resolution. CyberPFA is a novel particle flow algorithm specifically designed for the crystal bar electromagnetic
calorimeter (ECAL) in the CEPC reference detector. This innovative calorimeter design combines superior intrinsic energy resolution with cost efficiency but introduces two critical reconstruction challenges: (1). Severe shower overlaps due to the material's large Molière radius ($R_M$) and large ratio of radiation length (X0) to nuclear interaction length ($\lambda_I$). (2) Ambbiguity problem caused by the perpendicular arrangement of crystal bars.To overcome these challenges, CyberPFA introduces a breakthrough energy-core-based pattern recognition method, followed by an energy-splitting process to resolve overlapping showers. Additionally, multiple optimized pattern recognition techniques are implemented to address the ambiguity problem. Integrated with full detector simulation, CyberPFA achieves a 3.8% boson mass resolution for hadronic decays, surpassing the critical 4% threshold required for $W/Z$ separation.
These results demonstrate that: The long crystal bar ECAL is a viable and high-performance option for future colliders. CyberPFA’s energy-core-based reconstruction paradigm provides a novel and effective solution to imaging calorimeter reconstruction, specifically overcoming the critical challenges of shower overlaps in high-density environments. The algorithm’s innovative shower recognition approach is not only optimized for the current design but also adaptable to other imaging calorimeters, potentially enhancing their performance.
Speaker: Yang Zhang (Institute of High Energy Physics, Chinese Academy of Science) -
12:00
Smart Pixels at a Muon Collider 20m
A muon collider offers a means for reaching higher energies by combining the advantages of electron-positron and proton-proton colliders. Beam induced background (BIB), which results from muon decays in the beam, poses a significant challenge for detector design and readout. The pixel detector sits at the heart of the detector and is subjected to the largest rate of BIB. The bandwidth required to send all of the resulting signals off-detector is prohibitive. To overcome this challenge, we propose to develop “smart” pixels with a neural network implemented in front-end electronics to differentiate between clusters of hits produced by BIB and collision particles. We investigate properties of pixel clusters in simulation, and present a neural network that can selectively read out clusters of interest.
Speaker: Eliza Claire Howard (University of Chicago (US)) -
12:20
Light Axion-Like Particles at Future Lepton Colliders 20m
Axion-like particles (ALPs) are well-motivated extensions of the Standard Model (SM) that appear in many new physics scenarios, with masses spanning a broad range. In this work, we systematically study the production and detection prospects of light ALPs at future lepton colliders, including electron-positron and multi-TeV muon colliders. At lepton colliders, light ALPs can be produced in association with a photon or a Z boson. For very light ALPs (ma < 1 MeV), the ALPs are typically long-lived and escape detection, leading to a mono-V (V = γ, Z) signature. In the long-lived limit, we find that the mono-photon channel at the Tera-Z stage of future electron-positron colliders provides the strongest constraints on ALP couplings to SM gauge bosons, gaVV, thanks to the high luminosity, low background, and resonant enhancement from on-shell Z bosons. At higher energies, the mono-photon cross section becomes nearly energy-independent, and the sensitivity is governed by luminosity and background. At multi-TeV muon colliders, the mono-Z channel can yield complementary constraints. For heavier ALPs (ma > 100 MeV) that decay promptly, mono-V signatures are no longer valid. In this case, ALPs can be probed via non-resonant vector boson scattering (VBS) processes, where the ALP is exchanged off-shell, leading to kinematic deviations from SM expectations. We analyze constraints from both light-by-light scattering and electroweak VBS, the latter only accessible at TeV-scale colliders. While generally weaker, these constraints are robust and model-independent. Our combined analysis shows that mono-V and non-resonant VBS channels provide powerful and complementary probes of ALP-gauge
boson interactions.Speaker: Keping Xie (Michigan State University)
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Parallel: Neutrino Physics 4 Room H
Room H
Convener: Sophie Berkman-
11:00
Latest Results from the ICARUS Experiment at the Short-Baseline Neutrino Program 20m
The ICARUS Collaboration is now entering its fifth year of continuing
operations of the 760-ton liquid argon T600 detector. The T600 was
overhauled at CERN after operations at the LNGS underground
laboratory in Italy and moved to its present location at FNAL - as part of
the Short-Baseline Neutrino (SBN) program - where it successfully
completed its commissioning phase in June 2022. At FNAL ICARUS
collects neutrino interactions from both the Booster Neutrino Beam
(BNB) and off-axis from the Main Injector Neutrino beam (NuMI). To
date, ICARUS has accumulated approximately 5.2·1020 protons on target
(POT) with the BNB and about 6.2·1020 POT with NuMI. Within the SBN
program ICARUS will search for evidence of short-baseline oscillations,
potentially explained by eV-scale sterile neutrinos, jointly with the
Short-Baseline Near Detector (SBND). In addition, ICARUS is performing
stand-along oscillation searches in disappearance mode and measuring
neutrino cross sections on argon with both the BNB and NuMI beams. It
is also performing searches for additional Beyond the Standard Model
signatures. Preliminary results from the ICARUS experiment, using data
from the BNB and NuMI neutrino beams, will be presented.Speaker: Dr Promita Roy (Centre for Neutrino Physics, Virginia Tech) -
11:20
Sterile Neutrino Analyses at IceCube using Matter Enhanced Resonance 20m
The IceCube Neutrino Observatory has provided world-leading limits on sterile neutrino parameters by looking for a sterile signal caused by matter enhanced resonance in the Earth. IceCube can search for a matter-enhanced sterile neutrino signal using its large and high purity sample of upgoing muon neutrino tracks, with modern reconstruction techniques and a sophisticated systematics treatment. In this contribution, ongoing work to improve the IceCube sterile neutrino search over the 2023 results will be described. New ML reconstructions and classifiers will enable a redesigned event selection with better statistics and more event topologies, and a wide variety of systematics have been updated. These changes, as well as the range of sterile analyses they will enable, will be discussed.
Speaker: Miles Garcia (University of Delaware) -
11:40
DUNE liquid argon near detector and its prototypes 20m
To control the systematic uncertainties in its neutrino oscillation analyses, the Deep Underground Neutrino Experiment (DUNE) incorporates a near detector complex, which notably comprises ND-LAr, a 150-ton liquid argon time projection chamber. It is designed as a 7-by-5 array of optically segmented modules equipped with a novel pixelated charge readout system and a high-coverage light detection system to be able to cope with the high neutrino interaction rates from the unprecedentedly high DUNE beam power. To accomplish this and demonstrate the viability of this technology, several ton-scale prototypes have been constructed including the 2x2 demonstrator, situated in the NuMI beamline at Fermilab, and the full-scale demonstrator that collected cosmic ray data. In this talk, I will present the ND-LAr design and discuss the operations and results from its various prototypes.
Speaker: Jaafar Chakrani (Lawrence Berkeley National Lab. (US)) -
12:00
Results from the LEGEND-200 experiment in the search for neutrinoless double beta decay 20m
The discovery of Neutrinoless double beta decay (0νββ) would provide unambiguous evidence for the Majorana nature of neutrinos, lepton number non-conservation and a measurement of the absolute neutrino mass scale. The Large Enriched Germanium Experiment for Neutrinoless ββ decay (LEGEND) is a phased search for 0νββ in the 76Ge isotope with enriched high-purity germanium (HPGe) detectors. The LEGEND experiment brings together the innovation and expertise from its very successful, 76Ge-based predecessors, GERDA and MAJORANA DEMONSTRATOR. The first phase, LEGEND-200, located at LNGS, Italy, is presently acquiring physics data with close to 100 kg of HPGe detectors. With an exposure of 1 ton-year and a background index in the region of interest of less than 2 ´ 10-4 cts/(keV kg yr), LEGEND-200 will reach a discovery sensitivity of a half-life of 1027 years.
This talk will provide an overview of the LEGEND experiment, including the latest results from the LEGEND-200 and the prospects for the upcoming LEGEND-1000 phase.
This work is supported by the U.S. DOE and the NSF, the LANL, ORNL and LBNL LDRD programs; the European ERC and Horizon programs; the German DFG, BMBF, and MPG; the Italian INFN; the Polish NCN and MNiSW; the Czech MEYS; the Slovak SRDA; the Swiss SNF; the UK STFC; the Canadian NSERC and CFI; the LNGS, SNOLAB, and SURF facilities.
Speaker: Harisree Krishnamoorthy (Postdoc) -
12:20
Directly determine the electron-neutrino mass with sub-eV sensitivity by the decay of 159Dy 20m
The measurement of neutrino mass represents a long-standing major scientific challenge, carrying profound significance for both particle physics and astrophysics. The energy spectra of β-decay or electron capture (EC) in radioactive nuclides can be employed to directly measure neutrino mass. Isotopes with low decay energy are particularly advantageous for enhancing the sensitivity of neutrino mass measurements due to the significantly enhanced decay rate in the endpoint region of the decay energy spectrum. The EC decay process of 159Dy to 159Tb exhibits an ultra low decay energy. This paper proposes using superconducting detectors to study the decay energy spectrum of this process， expecting to achieve a direct measurement of the electron-neutrino mass with sub-eV sensitivity at a 90% confidence level.
Speaker: Prof. Yuekun Heng (Institute of High Energy Physics, Chinese Academy of Sciences)
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Parallel: Triggers AI/ML Room I
Room I
Convener: Maria Cepeda (CIEMAT)-
11:00
Online track reconstruction with graph neural networks on FPGAs for the ATLAS experiment 20m
The High-Luminosity Large Hadron Collider (HL-LHC) at CERN marks a
new era for high-energy particle physics, demanding significant
upgrades to the ATLAS Trigger and Data Acquisition (TDAQ) system.
Central to these upgrades is the enhancement of online software
tracking capabilities to meet the unprecedented data rates and
complexity of HL-LHC operations. This study investigates the
deployment of Graph Neural Networks (GNNs) on Field-Programmable
Gate Arrays (FPGAs) within the Event Filter system of the ATLAS
experiment. Focusing on the reconstruction of tracks in the new
all-silicon ATLAS Inner Tracker, we detail a GNN-based tracking
pipeline comprising graph construction, edge classification via
interaction networks, and segmentation into track candidates. Key
optimizations, including model hyperparameter tuning, pruning,
quantization-aware training, and sequential processing of detector
regions, are explored to reduce FPGA resource utilization and
maximize throughput. Our results demonstrate the potential of this
approach to achieve high tracking efficiency and low fake rates,
aligning with the stringent requirements of the ATLAS Event Filter
system for HL-LHC operations.Speaker: Mark Neubauer (Univ. Illinois at Urbana Champaign (US)) -
11:20
Run 3 CMS Trigger Developments for New Physics Exploration 20m
During the Run 3 LHC phase, the CMS trigger system has undergone significant advancements, enabling the exploration of new regions of phase space in fundamental physics. These improvements have been crucial in overcoming challenges such as the high-luminosity environment of the LHC and the effects of detector aging due to radiation damage. This talk will showcase performances and key physics results made possible by recent innovations in the CMS trigger system, including enhanced object reconstruction, the ability to trigger on novel signatures such as long-lived particles, and the integration of machine learning. Additionally, advanced techniques like data scouting and data parking have expanded the system’s capabilities, paving the way for new discoveries at very low mass.
Speaker: Elisa Fontanesi (CERN) -
11:40
Strategies and Performances of the CMS Trigger in Run 3 [ZOOM] 20m
The CMS trigger system plays a critical role in selecting the most interesting events for physics analyses from the vast amount of data produced by proton-proton collisions at the LHC. With the start of Run 3, operating at a center-of-mass energy of 13.6 TeV and under increasing instantaneous luminosity conditions, significant upgrades and strategy refinements have been implemented in both the Level-1 (L1T) hardware trigger and the High-Level Trigger (HLT) software system. This talk presents an overview of the CMS trigger strategies during Run 3, highlighting key algorithmic developments, improved use of detector information, and novel techniques for rate control and event selection. Performance metrics including efficiencies, resolutions, and trigger rates are discussed across a broad range of physics signatures, from electroweak and top quark processes to searches for new physics.
Speaker: Vinaya Krishnan Nair (Universita & INFN Pisa (IT)) -
12:00
GELATO: A Generic Event-Level Anomalous Trigger Option for ATLAS in LHC Run 3 20m
Search for physics beyond the Standard Model has been a long-standing subject at the LHC. The absence of such signatures indicates that new physics may elude standard triggers; conventional triggers at the ATLAS experiment are constructed by setting thresholds on variables such as the particle momentum, targeting event topologies exclusive to specific models. Anomaly detection, a form of unsupervised machine learning, enables searches for signatures which deviate from the Standard Model without relying on particular model assumptions. We present the first anomaly detection trigger at ATLAS, newly developed and integrated for data-taking in LHC Run 3. In addition to its design and expected performance, we discuss its commissioning, validation, and operational robustness, along with some look in the newly collected data. The first anomaly detection trigger in ATLAS marks a milestone for machine learning-based, next-generation triggers and model-agnostic searches for new physics.
Speaker: Kaito Sugizaki (University of Pennsylvania (US)) -
12:20
CICADA: Real-Time Anomaly Detection with Calorimeter Images at the CMS Level-1 Trigger 20m
In the search for new physics, real-time detection of anomalous events is critical for maximizing the discovery potential at the LHC. CICADA (Calorimeter Image Convolutional Anomaly Detection Algorithm) is a novel CMS trigger algorithm operating at the 40 MHz collision rate. By leveraging unsupervised deep learning techniques, CICADA aims to enable physics-model-independent trigger decisions, enhancing sensitivity to unanticipated signals. One of the key challenges is deploying such a system on resource-constrained hardware without compromising performance. This is addressed by utilizing knowledge distillation to replicate the performance of an unsupervised anomaly detection model (teacher) in the smaller supervised model (student) that maintains high detection sensitivity while significantly reducing the memory footprint and computational demands. The final compressed model is deployed on FPGAs, allowing CICADA to perform real-time decision-making while operating within the stringent constraints of the CMS trigger system. This talk will focus on the architecture, training procedure, deployment, evaluation, and performance of CICADA in LHC Run 3.
Speaker: Isobel Ojalvo (Princeton University (US))
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Parallel: Theory 4 Room E
Room E
Conveners: Anjan Giri, Zhen Liu (University of Minnesota (US))-
11:00
Correlating flavor anomalies and dark matter in the light of scalar leptoquark 20m
In recent times, several anomalies have been observed in the semileptonic decays of $B$ meson mediated by FCNC transitions $b \to s \mu^+ \mu^-$. These tantalizing signals point towards the possible existence of New Physics beyond the Standard Model. We explore $U(1)_{L_e-L_\mu}$ gauge extension of the Standard Model with particle content enlarged by three neutral fermions, of which the lightest one contributes to dark matter content of the Universe. The scalar sector is enriched with a $\tilde{R}_2$ scalar leptoquark doublet to investigate flavor anomalies in $B$-meson sector alongwith an additional scalar singlet to spontaneously break the new $U(1)$ symmetry. New physics contribution for $b \to s$ transition comes from penguin diagrams with $Z^\prime$, leptoquark and new fermions. We analyze the constraints on the model parameters from the established observables of $B \to K^{(*)} \mu^+ \mu^-$ and $B_s\to \phi \mu^+ \mu^-$ decay channels. We further discuss dark matter relic density and direct detection cross section in scalar and gauge portals. Utilizing the permissible parameter space consistent with both flavor and dark sectors, we illustrate the impact on various observables such as branching ratio, forward-backward asymmetry, longitudinal polarisation asymmetry, and also lepton non-universality of $\Lambda_b \to \Lambda ^* (1520) (\to pK) \ell ^+\ell ^-$ decay channel.
Speaker: Rukmani Mohanta -
11:20
Cosmology in an extended parameter space: new constraints on dark energy and neutrino masses with DESI BAO [Zoom] 20m
Based on arXiv: 2409.13022 (published in ApJ Letters). We update constraints on cosmological parameters in a 12-parameter model, which extends the standard 6-parameter ΛCDM to include dynamical dark energy and massive neutrinos, along with other new parameters. We use the latest Planck PR4 (2020) likelihoods, DESI DR1 BAO, and the latest uncalibrated type Ia Supernovae (SNe) datasets. In this talk, I will discuss the implications for dynamical dark energy in such an extended model, and at the same time, provide robust bounds on neutrino masses which will be useful for the astro- and particle physics communities. I will also discuss the current status of the weak lensing tension and the Hubble tension in this extended cosmology.
Speaker: Shouvik Roychoudhury (Academia Sinica Institute of Astronomy and Astrophysics) -
11:40
Entanglement and beyond: Quantum information properties of on-shell scattering 20m
Recently it has been noticed that many familiar quantum field theories (QFTs) may minimize or maximize the amount of entanglement in a scattering process. Studying the quantum information (QI) properties of final states for on-shell scattering will help establish whether fundamental physics can be formulated in terms of QI principles. We first present a universal relation between final state entanglement entropy and (semi)-inclusive cross sections. This implies a growing behavior of the entanglement entropy in the very high energy limit, which hints at a connection between micro- and macroscopic physics. We then go beyond the concept of entanglement and consider the notion of magic, which quantifies the computational advantage of quantum states over classical algorithms. A novel bound for magic in 2-qubit systems is derived, which suggests new connections between magic and entanglement as well as other principles in QFTs.
Speakers: Zhewei Yin, Zhewei Yin (Northwestern University), Zhewei Yin -
12:00
Controlling flavour in the Inverse Seesaw 20m
In order to facilitate a connection between the Lagrangian
parameters of the Inverse Seesaw mechanism and low-energy data, we systematically develop new parametrisations of the Yukawa
couplings. Relying on these new parametrisations to explore the parameter space, we discuss the
complementary role of charged lepton flavour violation searches in dedicated facilities, as well as
in lepton colliders (FCC-ee and µTRISTAN). Our results reveal the strong synergy of the different
indirect searches in probing the distinct flavour sectors of the model. In particular, we show that
in the absence of radiative decays $\ell_\alpha\to\ell_\beta\gamma$, sizeable rates for $Z$-penguin dominated observables
could hint at a non-trivially mixed and non-degenerate heavy spectrum.Speaker: Jonathan Kriewald (Jožef Stefan Institute) -
12:20
Natural Top Quark Condensation: HIggs Boson as a top-antitop Atom 20m
The original top condensation theory of the 1990's deployed the renormalization group improved Nambu-Jona-Lasinio model, which lacked an internal wave-function. When close to critical coupling the NJL model breaks down. We then require a UV completion leading to an internal wave-function phi(r). phi(r), near criticality, expands and dilutes phi(0) which significantly modifies the predictions of the theory which becomes concordant with experiment. The fine tuning is doubly reduced by the dilution effect to a few % and the compositeness scale (the mass of colorons in a topcolor UV completion) is predicted to be M_0 = 6 TeV, potentially accessible at the LHC. Quantum loop effects multiplicatively enhance the binding interaction, which becomes critical, even though the topcolor theory remains subcritical.
Speaker: Christopher Hill (Fermilab (emeritus), UW-Madison)
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Special Events: Young-Senior Mingling Grand Terrace
Grand Terrace
Conveners: Fabrizio Vassallo (University of Wisconsin–Madison), Mitanshu Thakore (University of Wisconsin Madison (US)) -
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Parallel: Heavy Ion Physics Room H
Room H
Convener: Qipeng Hu (University of Science and Technology of China (CN))-
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An overview of recent heavy ion results at CMS 30mSpeaker: Austin Alan Baty (University of Illinois Chicago)
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14:30
Overview of recent UPC measurements with the ATLAS Detector 20m
Relativistic heavy-ion collisions at the LHC generate intense electromagnetic fields, enabling a rich program of photon-induced processes in ultra-peripheral collisions (UPCs). This talk presents an overview of recent UPC measurements by the ATLAS Collaboration, spanning precision tests of quantum electrodynamics, probes of nuclear structure, and searches for physics beyond the Standard Model. Exclusive dilepton production provides stringent constraints on nuclear photon fluxes, their impact parameter dependence, and photon energy spectra. Measurements with forward neutron tagging further refine the impact parameter sensitivity, while tau-pair production offers a unique probe of the tau lepton’s anomalous magnetic moment. Beyond QED and QCD studies, UPCs provide a unique environment for exotic searches. A dedicated search for magnetic monopoles via the Schwinger mechanism is presented with comparisons to semiclassical predictions and MoEDAL’s results. The large photon flux in UPCs also enables the first observation of coincident production of $\gamma\gamma \rightarrow \mu^{+}\mu^{-}$ and a $\rho$ meson in UPC. These results can provide tighter constraints on photon fluxes and nuclear charge form factors, as well as insights into nuclear gluon PDFs, beyond those from inclusive $\rho$ meson photoproduction. Diffractive photonuclear processes, including exclusive J/ψ production, offer insights into nuclear gluon structure and spatial fluctuations. Additionally, jet production in UPCs is explored as a new probe of nuclear PDF modifications, with measurements disentangling photo-nuclear, diffractive, and two-photon processes. These data constrain nuclear PDFs in poorly explored kinematic regimes and may reveal the radial dependence of nuclear modifications. Together, these results demonstrate the versatility of UPCs in probing fundamental physics—from precision QED and nuclear structure to exotic particle searches—highlighting the LHC’s role as a photon-photon and photon-nucleus collider.
Speaker: Kartik Deepak Bhide (University of Freiburg (DE)) -
14:50
Electromagnetic probes in small to large collision systems with ALICE 20m
Electromagnetic probes are an exceptional tool for studying the space-time evolution of the hot and dense matter created in ultra-relativistic heavy-ion collisions. Photons and $e^+e^-$ pairs (dielectrons) are produced at all stages of the collision with negligible final-state interactions, thereby retaining the information of their production and providing access to the thermal radiation from the early hot stages of the collision.
Measurements in minimum-bias proton--proton (pp) collisions serve as a crucial baseline for the studies in heavy-ion collisions by constraining the contribution of hadronic decays, whereas pp collisions with high charged-particle multiplicities allow the search for an onset of thermal radiation in small systems.This talk will present the final ALICE results from the LHC Run 2 on the photon and dielectron production in pp and Pb--Pb collisions. These results will be compared to theoretical models that include a contribution from a thermalised source. Additionally, first results of LHC Run 3 are presented which follow a substantial upgrade to the ALICE detector allowing a higher data aquisition rates and a better rejection of the hadronic background due to an improvement in the pointing resolution.
Speaker: Jerome Jung (Goethe University Frankfurt (DE)) -
15:10
Top-Quark Pair Production in Heavy-Ion Collisions in the ATLAS Experiment 20m
Top-quark pair production in heavy-ion collisions provides a unique opportunity to probe nuclear parton distribution functions and study the time evolution of strongly interacting matter, including the quark-gluon plasma. This work presents the observation and measurement of top-quark pair production in both proton-lead (p+Pb) and lead-lead (Pb+Pb) collisions using the ATLAS experiment at the Large Hadron Collider (LHC). In p+Pb collisions at a centre-of-mass energy of 8.16 TeV, top-quark pair production is observed in the lepton+jets and dilepton channels, with significances exceeding 5 standard deviations in each channel. The nuclear modification factor, ( R_{pA} ), is measured for the first time in this process, providing new insights into nuclear parton distribution functions. In Pb+Pb collisions at a centre-of-mass energy of 5.02 TeV, top-quark pair production is studied in the ( e\mu ) final state, using datasets recorded in 2015 and 2018 with an integrated luminosity of 1.9 nb(^{-1}). The measurement achieves a significance of 5.0 standard deviations and is compared to theoretical predictions based on various nuclear PDF sets. These measurements establish top-quark pairs as valuable tools for investigating heavy-ion collisions, offering novel insights into the dynamics of the quark-gluon plasma and nuclear matter.
Speaker: Patrycja Anna Potepa (AGH University of Krakow (PL))
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Parallel: QCD with Jets Room E
Room E
Convener: Robert Harris (Fermi National Accelerator Lab. (US))-
14:00
Overview of QCD Measurements with the CMS experiment [Zoom] 40m
An overview of QCD measurements with the CMS experiment will be presented, including status and prospects on the strong coupling constant, on soft, diffractive and exclusive processes examining events with large rapidity gaps, on event shape variables used to characterize the geometric structure of events with jets, on measurements of the Lund jet plane density in CMS providing insights into the phase space of emissions within jets, and quark-gluon saturation related topics from heavy ion collisions.
Speaker: Christophe Royon (The University of Kansas (US)) -
14:40
Measurement of multi-jets and vector boson plus jets production in ATLAS 20m
Production of multiple jets or vector bosons plus jets at the LHC offers the main, and unprecedented opportunity to study QCD at the high-energy regime. As precision advances, attention has been brought up to study further topics sensitive to understanding of QCD: different topological configurations between vector bosons and jets, the jet substructure information, and the heavy-flavor components. In addition, these measurements are key ingredients to give precise determination of the strong coupling constants. This talk will summarize recent achievements from ATLAS on this topic.
Speaker: Giulia Manco (Pavia University and INFN (IT)) -
15:00
Study of soft QCD phenomena and double parton interaction in ATLAS 20m
Despite the success of perturbative QCD predictions at the high-energy regime, QCD itself remains mysterious at its nominal scale (QCD scale). The LHC offers rich opportunities to probe the core of QCD related questions, by studying minibias events, double parton interactions, small-x and diffractive processes, as well as correlations in hadronization processes. This talk will summarize recent achievements from ATLAS on this topic.
Speaker: Fares Djama (CNRS/IN2P3 CPPM - Aix-Marseille Univ.)
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Parallel: Astrophysics 2 Room J
Room J
Convener: Lu Lu (University of Wisconsin-Madison)-
14:00
The Radio Neutrino Observatory in Greenland (RNO-G): Experiment Status and Overview; 20m
The Radio Neutrino Observatory in Greenland (RNO-G) is currently under construction near Summit Station atop the Greenland ice sheet. Its goal is to detect ultra-high-energy neutrinos (E > 100 PeV) by capturing short radio pulses—signatures of neutrino interactions with the ice. Once complete, the array will consist of 35 independent stations spread across ~50 km². Eight stations have already been deployed and are operational, each featuring a sparse array of antennas embedded in the glacier.
In this talk, I will present an overview of the detection technique and discuss recent results and ongoing work at the RNO-G.
Speaker: Alisa Nozdrina (CCAPP OSU) -
14:20
Searches for ultra-high-energy neutrinos and upward-going showers at the Pierre Auger Observatory [Zoom] 20m
The Pierre Auger Observatory plays a crucial role in detecting the most energetic particles in the Universe, including cosmic rays and neutrinos, to unravel their origins and contribute to multi-messenger astronomy. For the past two decades, during its Phase I, the Observatory has been actively searching for ultra-high-energy (UHE) neutrinos with energies above 0.1 EeV. These neutrinos can travel horizontally through the atmosphere or skim the Earth's crust, producing young air showers that can be detected by the Surface Detector Array, comprising 1,660 water-Cherenkov stations spread over an area of 3,000 km$^2$. Searches have been conducted for both point sources and diffuse flux. In addition, the Fluorescence Detector, consisting of 27 telescopes, has been used to search for upward-going air showers, motivated by the detection of ‘anomalous’ events by the ANITA instrument. In this contribution, we summarize the scientific results of these searches and discuss their astrophysical implications.
Speaker: Baobiao Yue -
14:40
Widen the Resonance: Probing a New Regime of Neutrino Self-Interactions with Astrophysical Neutrinos 20m
Neutrino self-interactions beyond the standard model have profound implications in astrophysics and cosmology. In this work, we study an uncharted scenario in which one of the three neutrino species has a mass much smaller than the temperature of the cosmic neutrino background. This results in a relativistic component that significantly broadens the absorption feature on the astrophysical neutrino spectra, in contrast to the sharply peaked absorption expected in the extensively studied scenarios assuming a fully nonrelativistic cosmic neutrino background. By solving the Boltzmann equations for neutrino absorption and regeneration, we demonstrate that this mechanism provides novel sensitivity to sub-keV mediator masses, well below the traditional $\sim 1$--100 MeV range. Future observations of the diffuse supernova neutrino background with Hyper-Kamiokande could probe coupling strengths down to $g \sim 10^{-8}$, surpassing existing constraints by orders of magnitude. These findings open new directions for discoveries and offer crucial insights into the interplay between neutrinos and the dark sector. (arXiv: 2501.07624)
Speaker: Bei Zhou (Fermilab) -
15:00
Prospects for All-Flavor PeV–EeV Neutrino Detection with IceCube 20m
While IceCube's current dataset has established an astrophysical neutrino flux up to ∼10 PeV, many theoretical models predict continued emission into the ultra-high-energy (UHE) regime—PeV to EeV—that would directly trace the sources of the highest-energy cosmic rays. To extend sensitivity beyond 10 PeV and complement the recent UHE neutrino candidate reported by KM3NeT, we combine through-going muon tracks from the northern sky with high-energy starting tracks and both contained and uncontained cascade events across the full sky. We present progress towards achieving superior resolution at extreme energies through advanced modeling of atmospheric backgrounds, refined ice systematics, and improved energy resolution in event reconstructions enabled by a combination of machine learning and likelihood-based techniques.
Speaker: EMRE YILDIZCI (University of Wisconsin-Madison)
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Parallel: Exotic Searches 2 Room KLOP
Room KLOP
Convener: Matthew Daniel Citron (University of California Davis (US))-
14:00
Searches for Supersymmetry with compressed scenarios 15m
Searches for Supersymmetry with compressed scenarios
Speaker: Justin Anguiano (The University of Kansas (US)) -
14:15
Searches for strong production of supersymmetric particles with the ATLAS detector 15m
Supersymmetry (SUSY) provides elegant solutions to several problems in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. Naturalness arguments favour supersymmetric partners of the gluons and third-generation quarks with masses light enough to be produced at the LHC. With increasing mass bounds on more classical MSSM scenarios other variations of supersymmetry, including non-minimal particle content, become increasingly interesting. This talk will present the latest results of searches conducted by the ATLAS experiment which target gluino and squark production, including stop, in a variety of decay modes.
Speaker: Matteo Greco (Max Planck Society (DE)) -
14:30
Recent searches for SUSY particles with CMS with MET 15m
Recent searches for SUSY particles with CMS with MET
Speaker: Jesus Manuel Vizan Garcia (Universidad de Cantabria and CSIC (ES)) -
14:45
Searches for electroweak production of supersymmetric particles with the ATLAS detector 15m
The direct production of electroweak SUSY particles, including sleptons, charginos, and neutralinos, is a particularly interesting area with connections to dark matter and the naturalness of the Higgs mass. The small production cross-sections and challenging experimental signatures, often involving compressed spectra, lead to difficult searches. This talk will highlight the most recent results of searches performed by the ATLAS experiment for supersymmetric particles produced via electroweak processes, including analyses targeting small mass splittings between SUSY particles, and including both in R-parity-conserving and R-parity-violating scenarios. Recent results involving the combination of searches are also presented.
Speaker: Bobby McGovern (University of Pennsylvania (US)) -
15:00
SUSY prospects at the HL-LHC 20m
Weak scale supersymmetry (SUSY) is highly motivated in that it provides a natural solution to the gauge hierarchy problem. However, recent strong limits from superparticle searches at LHC Run 2 may exacerbate a so-called Little Hierarchy problem (LHP): why is m_{weak}<< m_{soft}?
We review recent LHC search bounds as well as their impact on a variety of proposed SUSY models. We address the naturalness question. We also address the emergence of the string landscape and its impact on expectations for the SUSY spectrum. In the context of the string landscape, large SUSY-breaking scales are statistically favored, but only in those vacua that still yield a weak scale consistent with conditions for electroweak symmetry breaking and complex nuclei. This framework—sometimes called stringy naturalness—predicts a Higgs boson mass near 125~GeV and some superpartners that may lie just beyond the current LHC reach.
We highlight future SUSY search prospects at the High-Luminosity LHC (HL-LHC), focusing on non-universal Higgs mass models that emerge naturally from the above consideration. Such SUSY models offer distinct collider signatures that are promising to be probed in the forthcoming collider experiments. We argue that the current LHC has only begun to explore the most theoretically motivated regions of SUSY parameter space.
Speaker: Dr Kairui Zhang (University of Oklahoma)
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Parallel: Higgs 2 Room F
Room F
Convener: Abdollah Mohammadi (University of Wisconsin Madison (US))-
14:00
Measurements of the Higgs boson properties from diboson final states 20m
An important aspect of the Higgs boson physics programme at the LHC is to determine all the properties of this particle, including its mass, which is a free parameter in the SM, its width, CP properties and polarization states of the decay products. This presentation will discuss the latest developments in measurements of the Higgs boson properties, with the data collected by the CMS experiment.
Speaker: Jahid Hossain (University of Nebraska-Lincoln) -
14:20
Higgs CP properties and EFT measurements from ATLAS 20m
This talk presents precise measurement of the CP properties of the Higgs boson using the full dataset collected in pp collisions at 13 TeV during Run 2 and at 13.6 TeV during Run 3 of the LHC. The measurements are performed in various Higgs boson production and decay modes, as well as their combinations. Observation of deviations between these measurements and Standard Model (SM) predictions would be a sign of possible new phenomena beyond the SM.
Speaker: Haijun Yang (Shanghai Jiao Tong University (CN)) -
14:40
Measurements of Higgs Bosons Decaying to Bottom and Charm Quarks from Vector Boson Fusion Production with the ATLAS Experiment 20m
Using 126 fb-1 of Run 2 data collected with the ATLAS detector, a measurement of the $b\bar b$ decay of the Standard Model Higgs boson produced through vector boson fusion yielded a signal strength corresponding to an observed (expected) significance of 2.6 (2.8) standard deviations from the background only hypothesis. This talk will focus on improving the previous measurement by utilizing new developments such as: (1) a new trigger strategy implemented at the end of Run 2 to target inclusive VBF final state, (2) improvements in flavor tagging using newly developed tagger GN2, (3) as well as improvements of the adversarial neural network used for multivariate analysis for the signal extraction. Using 52 fb-1 of Run 3 data, this analysis is combined with the previous Run 2 analysis and adds additional sensitivity to $b\bar b$ decay of the Standard Model VBF Higgs production. Additionally, the inclusive VBF trigger with 90fb-1 of data is used to measure the limit of $c\bar c$ decay of the Standard Model Higgs produced through vector boson fusion.
Speaker: Luke Martin Vaughan (Oklahoma State University (US)) -
15:00
Constraints on Higgs light Yukawa couplings 20m
Constraints on Higgs light Yukawa couplings
Speaker: Alberto Zucchetta (Universita e INFN, Padova (IT))
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Parallel: Instrumentation 3 Room I
Room I
Convener: Georg Steinbrueck (Hamburg University (DE))-
14:00
Detector challenges at future higgs factories 20m
The LHC and the HL-LHC demand detectors that can withstand the hostile radiation and high occupancy environment of hadron colliders. On the surface, Higgs factory detectors are without challenges, but they merely are without these specific challenges – that does not make them easy to build. From the complex machine-detector interface to the varied role of muon systems, detectors at Higgs factories challenge our perception of what general purpose collider detectors need. Higgs factories are precision machines and open a realm of precision instrumentation at energy frontier colliders. This talk will cover the unique capabilities and general challenges of detectors at Higgs factories, and will offer a few forward-looking technologies preparing for this era.
Speaker: Grace Cummings (Fermi National Accelerator Lab. (US)) -
14:20
The upgrade of the ATLAS Trigger and Data Acquisition system for the High Luminosity LHC 20m
The ATLAS experiment at CERN is constructing upgraded system for the "High Luminosity LHC", with collisions due to start in 2030. In order to deliver an order of magnitude more data than previous LHC runs, 14 TeV protons will collide with an instantaneous luminosity of up to 7.5 x 10e34 cm^-2s^-1, resulting in much higher pileup and data rates than the current experiment was designed to handle. While this is essential to realise the physics programme, it presents a huge challenge for the detector, trigger, data acquisition and computing. The detector upgrades themselves also present new requirements and opportunities for the trigger and data acquisition system.
The design of the TDAQ upgrade comprises: a hardware-based low-latency real-time Trigger operating at 40 MHz, Data Acquisition which combines custom readout with commodity hardware and networking to deal with 4.6 TB/s input, and an Event Filter running at 1 MHz which combines offline-like algorithms on a large commodity compute service with the potential to be augmented by commercial accelerators. Commodity servers and networks are used as far as possible, with custom ATCA boards, high speed links and powerful FPGAs deployed in the low-latency parts of the system. Offline-style clustering and jet-finding in FPGAs, and accelerated track reconstruction are designed to combat pileup in the Trigger and Event Filter respectively.
This contribution will report recent progress on the design, technology and construction of the system. The physics motivation and expected performance will be shown for key physics processes.
Speaker: Thorsten Wengler (CERN) -
14:40
The CMS ME0 Upgrade: Enhancing Forward Muon Reconstruction at the HL-LHC 20m
The CMS muon system is undergoing substantial upgrades to meet the challenges of the High-Luminosity LHC (HL-LHC), including the installation of the new Muon Endcap 0 (ME0) detector. Large-scale production started in 2024. ME0 is a six-layer station designed to extend pseudo-rapidity coverage to |\eta| = 2.8 from the previous maximum of |\eta| = 2.4, enhancing sensitivity to forward physics processes. Each endcap will host 18 ME0 stacks, with each stack comprising six triple-layer gas electron multiplier (GEM) chambers. The system adds up to six additional hits per track, which significantly improves muon identification, spatial resolution, and robust track reconstruction at the first trigger level. Chamber production and quality control across multiple international sites ensures scalability and timely delivery. The ME0 design incorporates lessons learned from earlier GEM deployments, with improvements in electronics robustness, grounding, and segmentation to withstand high background rates and minimize damage from discharges. This contribution provides a comprehensive overview of the ME0 detector concept, assembly strategy, quality assurance procedures, current production status, and its pivotal role in strengthening CMS muon reconstruction during HL-LHC operations.
Speaker: Anureet Kaur Anureet Kaur (Panjab University, Chandigarh)
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Parallel: Quark Flavor 3 Room G
Room G
Convener: Matthew Herndon (University of Wisconsin Madison (US))-
14:00
Charm physics at Belle and Belle II 20m
The Belle and Belle II experiments have collected a $1.6 ~\mathrm{ab}^{-1}$ sample of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. These samples contain a large number of $e^+e^-\to c\bar{c}$ events that produce charmed mesons. We present measurements of charm-mixing parameters from flavour-tagged $D^0\to K^0_{\rm S}\pi^+\pi^-$ decays. Direct $C\!P$ violation is searched for in $D^0\to K^0_{\rm S}K^0_{\rm S}$ decays and $D$ meson decays to two or three pions. In addition, we present searches for rare flavour-changing neutral current processes and measure several radiative decays of the $D_{(s)}$ meson. Further, we study several decays of the $\Xi_c$ baryon to determine branching fractions, $C\!P$ asymmetries and decay asymmetries.
Speakers: Giulia Casarosa, Giulia Casarosa -
14:20
Measurement of the relative phase between strong and EM decays 20m
The strong and electromagnetic interactions are the two main decay mechanisms in charmonium decays.
The relative phase between them is a basic parameter in understanding the decay dynamics, especially for precision measurements. In this talk, we present a direct measurement with resonance scan method. By introducing the EM amplitude from continuum decay, the interference between EM and strong mechanism is measured in $J/\psi$ decays to several final states.Speakers: Giulio Mezzadri, Giulio Mezzadri (Universita e INFN, Ferrara (IT)) -
14:40
A search for baryon-number violation in $B$-meson decays to two baryons. 20m
Searches for processes in which baryon number is violated by 2, as would be observed in neutron-antineutron oscillation, have so far come up empty. Many of these searches involve first-generation quarks leaving open the possibility that these processes preferentially couple to initial or final states involving second- and third-generation quarks. We present the results of a search for $B^+\to p\, \Lambda$ decays, which violates baryon-number by 2. The analysis uses the full data set of about 430 $\text{fb}^{-1}$ collected at the $\Upsilon(4{\mathrm{S}})$ resonance by the $BABAR$ experiment, at the $e^+e^-$ collider PEP-II
Speaker: Matthew Bellis (Cornell University/Siena College (US)) -
15:00
New precise measurement of the $e^+e^- \to \pi^+\pi^-(\gamma)$ with the $BABAR$ detector. 20m
We present a new precise measurement of the ratio of the $e^+e^- \to \pi^+\pi^-(\gamma)$ and $e^+e^- \to \mu^+\mu^-(\gamma)$ cross sections, using the initial-state radiation method. The analysis is based on the entire $BABAR$ data set, corresponding to 469 fb$^{-1}$, recorded at and near the $\Upsilon(4{\mathrm{S}})$ resonance.
The presented analysis does not rely on particle identification (PID) to separate the pion and muon channels which was the source of the largest systematic uncertainty in the 2009 $BABAR$ results. The use of the full $BABAR$ data set, together with releasing the strong cuts that were necessary for PID, provides an overall factor 7 in statistics.
The $\pi^+\pi^- / \mu^+\mu^-$ separation is achieved by fitting the angular distribution in the 2-particle system with templates built from the individual distributions essentially known from first principles. The Monte Carlo detector simulation is corrected for differences measured in data on the relevant efficiencies (trigger, tracking, kinematic selection and analysis cuts). In a 2023 $BABAR$ publication, it was demonstrated that the $BABAR$ method is insensitive to radiative corrections and their description in event generators. Blinding procedures on the efficiency measurements and in the cross-section fits are applied. After unblinding, muon results are compared to QED and the pion cross section is obtained, from which the muon $g-2$ hadronic-vacuum-polarization contribution is calculated.Speaker: Léonard POLAT
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Afternoon Break 30m
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Plenary: Wednesday Lecture Hall
Lecture Hall
Convener: FRANCIS HALZEN-
16:00
Cosmological implications for particle physics 30m
The synergy between cosmology and particle physics is remarkable, and I will discuss some of the more interesting recent results. First, regarding DESI claims of time-varying dark energy: I will report on my recent paper that obtains the dark energy density directly from DESI data and finds only 1.5 sigma discrepancy from LCDM; we argue that the w0/wa parametrization is a poor choice in extracting information from data. We conclude there is as yet no evidence for time-varying dark energy. Secondly, regarding dark matter, the bulk of matter (DM) in the Universe: I will discuss the latest from underground direct detection experiments, especially the status of results from multiple NaI detectors designed to test DAMA (as they are made of the same material). I will describe our new proposal of paleodetectors, looking for DM tracks in ancient O(Byr) old minerals from deep underground, an initiative that now has substantial federal and foundation funding ($4M). Thirdly regarding neutrinos: although they (sadly) cannot make up the dark matter of the universe, cosmology continues to provide among the strongest bounds on the sum of neutrino masses, which at this point clearly add up to about 0.1 eV. Finally, if I have time, I will give a status report on tensions in cosmology: will any of them break standard cosmology?
Speakers: Katherine Freese, Katherine Freese -
16:30
Multi-messenger astrophysics 30m
Multi-messenger astrophysics combines the information from multiple messengers from the Universe, such as electromagnetic radiation (across wide energy ranges), cosmic rays, neutrinos and gravitational waves. I will briefly introduce the messengers, and then focus on several examples for the multi-messenger connection. One example is the transport of Ultra-High-Energy Cosmic Rays (UHECRs) and the accompanying production of cosmogenic neutrinos and photons. Another example involves source models for active galactic nuclei (AGN), used to estimate the neutrino flux from UHECR-accelerating AGN blazars and to predict the multi-wavelength signature of an accretion flare linked to the most energetic neutrino detected to date — KM3-230213A. Finally, I will discuss how the messengers can be used for physics BSM tests.
Speaker: Walter Winter -
17:00
Cherenkov Neutrino Telescopes: Recent Progress and Next Steps 30m
High-energy neutrino astronomy began in the 1970s with the concept of water Cherenkov detectors, envisioning instrumented cubic-kilometer volumes. This vision was first realized with an ice Cherenkov detector: IceCube. IceCube utilizes the glacial ice at the South Pole as a Cherenkov medium, employing an array of photon sensors to measure the distribution of Cherenkov light and thereby determine the energy, direction, and flavor of incoming neutrinos.
Today, ocean- and lake-based Cherenkov neutrino telescopes such as KM3NeT and Baikal-GVD are partially constructed and operational, while additional projects like P-ONE, TRIDENT, HUNT, and NEON are deploying R&D optical sensors and pathfinder strings to demonstrate system feasibility. IceCube itself is advancing with the construction of the IceCube Upgrade, which will enable precise calibration of sensors and detailed characterization of the glacial ice, thereby improving event reconstruction precision. This construction, scheduled for completion during the 2025–2026 austral summer season, will pave the way for IceCube-Gen2, which aims to instrument approximately 8 km³ of glacial ice with around 10,000 optical sensors, significantly enhancing sensitivity to astrophysical neutrino sources.
This talk will outline the current achievements of Cherenkov neutrino telescopes, their present limitations, and the exciting future that lies ahead, including recent results from the IceCube experiment—the pioneer of neutrino astrophysics and multimessenger astronomy.
Speaker: Aya Ishihara (ICEHAP, Chiba University)
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Community Events: Explore Downtown Madison!
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Banquet 2h
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Plenary: Thursday Lecture Hall
Lecture Hall
Convener: Didar Dobur (Ghent University (BE))-
09:00
B physics phenemenology 30mSpeakers: Matthias Neubert, Matthias Neubert (Johannes Gutenberg Universitat Mainz), Matthias Neubert (Johannes Gutenberg University Mainz), Matthias Neubert (Unknown)
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09:30
Non-resonant searches at the TeV scale 30m
Common ATLAS and CMS presentation
Speaker: Amandeep Kaur (Rutgers State Univ. of New Jersey (US)) -
10:00
Early career issues in particle physics 30m
20m presentation + 10m discussion
Speaker: Saptaparna Bhattacharya (Southern Methodist University (US))
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Morning Break 30m
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Parallel: Astrophysics 3 Room J
Room J
Convener: Antoine KOUCHNER-
11:00
The KM3NeT neutrino detectors: technology, scientific results, and future perspectives 20m
KM3NeT is a next-generation neutrino observatory under construction in the Mediterranean Sea, designed to explore fundamental questions in neutrino physics and astrophysics. It consists of two deep-sea Cherenkov detectors: ARCA, located off Sicily and optimized for high-energy cosmic neutrinos (TeV–PeV), and ORCA, near the French coast, designed for atmospheric neutrinos (2–100 GeV) and neutrino oscillation studies.
ARCA and ORCA are currently operated in partial configurations, actively taking data and producing competitive results. Recent high-impact results include the observation by KM3NeT/ARCA of the ultra-high-energy neutrino event KM3230213A, demonstrating the experiment's capability for probing extreme-energy astrophysical phenomena.
KM3NeT also plays a pivotal role in the field of multi-messenger astronomy, providing real-time neutrino data streams that facilitate coordinated observations with other cosmic messengers.
This presentation will provide an overview of the current status of the KM3NeT infrastructure, highlight recent physics and astrophysics results, and discuss the prospects for future scientific exploration with the full detector configuration.Speaker: Daniele Vivolo -
11:20
Results from multi-flavor neutrino searches for galactic diffuse emission with IceCube 20m
In 2023, the IceCube Neutrino Observatory reported on the strong evidence of neutrinos from the galactic plane at a significance of 4.5 sigma. Since then, additional years of data, along with improvements in ice modeling, calibration and reconstruction have allowed for an updated selection of contained and partially contained cascades, which are signatures arising from neutrino-induced in-ice particle showers. In this talk, we report on a multi-flavor search of galactic neutrinos, by combining the cascade sample with through-going and starting tracks that arise primarily from muon secondaries produced in muon-neutrino charged current interactions. Results from tests of four galactic diffuse emission models will be presented.
Speaker: Tianlu Yuan (University of Wisconsin Madison) -
11:40
Search for neutrino counterparts of Galactic PeVatrons with IceCube’s 12.3-year multi‐flavour sample 20m
Galactic PeVatrons - the accelerators of PeV cosmic rays - remain unidentified. Observations by LHAASO, HAWC and HESS of >100 TeV γ-ray emission have revealed promising candidates, but γ-rays alone can't distinguish hadronic from leptonic processes. We report a search for neutrino counterparts to the extended Cygnus Cocoon region and to PeVatron candidates using ICEMAN, the 12.3-year IceCube Multi-Flavor Astrophysical Neutrino sample - an all-sky dataset that combines starting tracks, through-going muons and cascade events.
Speaker: Leo Seen (University of Wisconsin - Madison) -
12:00
P-ONE: first string developments, status, and outlook 20m
The Pacific Ocean Neutrino Experiment will be located in the Cascadia Basin off the coast of Victoria, BC. This new experiment is a water-based Cherenkov neutrino telescope that will be rolled out in 3 stages to ultimately cover a cubic kilometer of deep-ocean water. The goal of this experiment is to capture ultra-high-energy astrophysical neutrinos and identify and collect data of bioluminescent organisms. Digital optical modules will populate moored lines anchored on Ocean Network Canada's deep-sea infrastructure. The detector will require a firmware-level trigger and data acquisition system for physics and bioluminescent events, as well as a sophisticated on-shore system to further remove background and cluster event signatures. The first line will be deployed in the Fall of 2025, followed by a single cluster deployment (P-ONE-Demonstrator), and then the full array (P-ONE). This talk will give an overview of the pathfinder mission, STRAW-b, the current status of the first string, and an outlook to the Demonstrator and Array.
Speaker: Dr Victoria Parrish (Michigan State University) -
12:20
TAMBO - A Novel Neutrino Telescope for High-Energy Astrophysical Neutrino Detection 20m
The detection of high-energy astrophysical neutrinos remains challenging due to overwhelming atmospheric backgrounds obscuring potential cosmic signals. The Tau Air-shower Mountain-Based Observatory (TAMBO) is a purpose-designed neutrino telescope that achieves unprecedented signal-to-background discrimination in the 1-1000 PeV energy range. Leveraging its unique deep valley geometry, TAMBO will generate an exceptionally pure neutrino sample, enabling precise investigations of neutrino sources and neutrino flavor composition. Preliminary sensitivity studies demonstrate TAMBO's potential to map diffuse and point-source neutrino emissions and resolve neutrino flavor ratios at the PeV scale, representing a significant advancement in high-energy neutrino astronomy.
Speaker: Pavel Zhelnin
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Parallel: BSM Di-Higgs / Di-scalars Room E
Room E
Convener: Flavia de Almeida Dias (Nikhef National institute for subatomic physics (NL))-
11:00
Search for new heavy resonances decaying to higgs boson pairs in boosted bbtautau final states 20m
This talk presents a search for beyond-the-standard-model heavy resonances decaying into Higgs boson pairs in the bbtautau final state, using the full Run 2 dataset collected by the CMS experiment, corresponding to 138 fb^-1 of proton-proton collisions at a center of mass energy of 13 TeV. The analysis targets events where one tau lepton decays hadronically and the other either hadronically or leptonically. In the TeV mass range, the decay products of the Higgs bosons become highly collimated, requiring dedicated reconstruction techniques. The search leverages advanced machine learning algorithms for identifying boosted hadronic tau decays and substructure-based methods for tagging Higgs->bb candidates.
Speaker: Ganesh Parida (University of Wisconsin Madison (US)) -
11:20
Recent Heavy resonances searches (including new scalars & BSM Higgs decays) 20m
Though the Standard Model (SM) of particle physics has been a very successful theory in explaining a wide range of measurements, there are still many questions left unanswered such as incorporation of gravity into SM, neutrino masses, matter-antimatter asymmetry, supersymmetry, or existence of dark matter candidates. One of the possible solutions to address these challenges is the extension of the SM with the presence of additional, heavy BSM particles; including scalar (H/S), pseudoscalar (A), or charged (H+-/H++--) BSM Higgs bosons. This is accounted for in multiple possible new physics models predicting the existence of these new, heavy particles. This talk summarises recent ATLAS searches for Beyond-the-Standard-Model heavy resonances, using the full Run 2 dataset.
Speaker: Liza Brost (Brookhaven National Laboratory (US)) -
11:40
Search for Higgs boson decays into a pair of pseudoscalar particles in the $\gamma\gamma\tau\tau$ final state using $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector 20m
Many well-motivated extensions of the Standard Model predict light (pseudo)scalars, referred to as 𝑎 bosons, that couple to the 125 GeV Higgs boson, enabling new exotic decay modes. This study presents a search for Higgs boson decays into a pair of such particles, $H\rightarrow bb$, where one 𝑎-boson decays into a photon pair and the other into a $\tau$-lepton pair, performed for the first time at the Large Hadron Collider. Both $\tau$-leptons are reconstructed in their hadronic decay modes using a novel dedicated tagger for collimated $\tau$-lepton pairs. The search uses 140/fb of proton–proton collision data at a centre-of-mass energy of $\sqrt{s} = 13$ TeV recorded between 2015 and 2018 by the ATLAS experiment. The search is performed in the mass range of the $a$ boson between 10 GeV and 60 GeV.
Speaker: Arya Aikot (Univ. of Valencia and CSIC (ES)) -
12:00
HH and Scalar+H resonant searches and their combination at CMS 20m
HH and Scalar+H resonant searches and their combination at CMS
Speaker: Muhammad Ahmad (Texas A & M University (US)) -
12:20
HH and Scalar+H resonant searches at the HL-LHC 20m
HH and Scalar+H resonant searches at the HL-LHC based on projections in the CMS HH/HY review paper and the ESU document
Speaker: Devin Michael Aebi (Texas A & M University (US))
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Parallel: Computing AI/ML 1 Room I
Room I
Convener: Kelci Ann Mohrman (University of Florida (US))-
11:00
Efficient bin by bin profile likelihood minimization for precision measurements 20m
The High-Luminosity LHC era will deliver unprecedented data volumes, enabling measurements on fine-grained multidimensional histograms containing millions of bins with thousands of events each. Achieving ultimate precision requires modeling thousands of systematic uncertainty sources, creating computational challenges for likelihood minimization and parameter extraction. Fast minimization is crucial for efficient analysis development.
We present a novel tensorflow-based tool that leverages optimized parallelization on CPUs and GPUs for this task. Our implementation interfaces with boost histograms, supporting flexible likelihood configurations with symmetrization options to establish Gaussian approximations. The minimization utilizes automatic differentiation to compute (quasi) second-order derivatives, yielding robust and efficient results. We further provide analytic proof of deterministic solutions within linear approximation limits.
Our tool distinctly focuses on measuring physical observables rather than intrinsic parameters, disentangling likelihood parameterization from quantities of interest and creating a more intuitive, less error prone user experience. Comprehensive benchmarking demonstrates excellent scaling with increased threading and reveals significant efficiency gaps when compared to commonly used frameworks in the field. These performance differences highlight the need for continued development of optimized statistical tools for high-energy physics analyses.
Speaker: David Walter (Massachusetts Inst. of Technology (US)) -
11:20
Inclusive flavour tagging at LHCb 20m
We present a new algorithm for tagging the production flavour of neutral 𝐵0 and 𝐵0𝑠 mesons in proton-proton collisions. It is based on a deep neural network, DeepSets, and exploits a comprehensive set of tracks associated with the hadronization process. The algorithm is calibrated on data collected by the LHCb experiment at a centre-of-mass energy of 13TeV. This inclusive approach enhances the flavour tagging performance beyond the established same-side and opposite-side tagging methods. The gains
in tagging power offer significant benefits for precision measurements
of 𝐶𝑃 violation and mixing in the neutral 𝐵 meson systems.Speaker: Jonah Evan Blank (Technical University Dortmund) -
11:40
Self-Supervised Learning Strategies for Jet Physics 20m
We extend the re-simulation-based self-supervised learning approach to learning representations of hadronic jets in colliders by exploiting the Markov property of the standard simulation chain. Instead of masking, cropping, or other forms of data augmentation, this approach simulates pairs of events where the initial portion of the simulation is shared, but the subsequent stages of the simulation evolve independently. When paired with a contrastive loss function, this naturally leads to representations that capture the physics in the initial stages of the simulation. In particular, we force the hard scattering and parton shower to be shared and let the hadronization and interaction with the detector evolve independently. We then evaluate the utility of these representations on downstream tasks.
Speaker: Garrett Merz (UWisconsin-Madison) -
12:00
Automatizing the search for mass resonances using BumpNet 20m
The search for resonant mass bumps in invariant-mass histograms is a fundamental approach for uncovering Beyond the Standard Model (BSM) physics at the LHC. Traditional, model-dependent analyses that utilize this technique, such as those conducted using data from the ATLAS detector, often require substantial resources, which prevent many final states from being explored. Modern machine learning techniques, such as normalizing flows and autoencoders, have facilitated such analyses by providing various model-agnostic approaches; however many methods still depend on background and signal assumptions, thus decreasing their generalizability.
We present BumpNet, a convolutional neural network (CNN) that predicts log-likelihood significance values in each bin of smoothly falling invariant-mass histograms, enhancing the search for resonant mass bumps. This technique enables a model-independent search of many final states without the need for traditional background estimation, making BumpNet a powerful tool for exploring the many unsearched areas of the phase space while saving analysis time. Trained on a dataset consisting of realistic smoothly-falling data and analytical functions, the network has produced encouraging results, such as predicting the correct significance of the Higgs boson discovery, agreement with a previous ATLAS dilepton resonance search, and success in realistic Beyond the SM (BSM) scenarios. We are now training and optimizing BumpNet using ATLAS Run 2 Monte Carlo data, with the ultimate goal of performing general searches on real ATLAS data. These encouraging results highlight the potential for BumpNet to accelerate the discovery of new physics.
Related work at https://link.springer.com/article/10.1007/JHEP02(2025)122.
Speaker: Ethan James Meszaros (Université de Montréal (CA)) -
12:20
An AI Agent for Particle Physics Documentation 20m
We present a Retrieval-Augmented Generation (RAG) system designed to assist particle physics analysts by enabling efficient querying of information from a collection of technical documents. The system can process and extract relevant content from PDF files, provide accurate answers to user queries, and include direct reference links to the original sources. We demonstrate the capabilities of the tool using CMS analysis documentation and provide a user-friendly interface to facilitate interaction.
The workflow is experiment-agnostic and can be adapted for use in other collaborations. Importantly, it operates entirely on local infrastructure using self-hosted language models, ensuring that sensitive documents remain private and data is not transferred outside of approved servers. Preliminary use of the tool indicates a potential reduction of over 40% in the time analysts typically spend searching through documentation manually. We also discuss future development directions, including planned features to enhance functionality and usability in subsequent versions.
Speaker: Abhishikth Mallampalli (University of Wisconsin Madison (US))
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Parallel: EWK Physics 3 Room F
Room F
Convener: Junjie Zhu (University of Michigan (US))-
11:00
Electroweak vector boson processes at the highest energies 20m
Applying electroweak factorization for the quantum field theory of the Standard Model at its highest energies (when it is in its unbroken phase) speeds up calculations considerably for EW vector-boson fusion (VBF) processes which constitute the bulk of the cross section at parton collisions beyond a TeV. Furthermore, this formalism is very important for the conceptual understanding of the EW interactions at these energies and paves the way for resumming large logarithms necessary for precision predictions. We study the so-called effective vector boson approximation (EVA) for W and Z bosons inside leptons and quarks, mostly for future multi-TeV muon colliders, but also for FCC-hh at 100 TeV. Using our simulation framework inside the Whizard event generator, we study VBF processes using EW PDFs which are solution of DGLAP evolution equations containing the full chiral SM. We compare EVA with EWPDF simulations and the full partonic matrix elements, investigating where resummation effects are important.
Speaker: Juergen Reuter (DESY Hamburg, Germany) -
11:20
EW gauge boson 3/4-body rare decay at the LHC 20m
We investigate the $W$ boson's exotic decay channel, $W \rightarrow \ell\ell\ell \nu$, at the LHC. Although the four-body final states suppress the decay branching ratio, the large production of $W$ bosons makes detecting and precisely measuring this decay probability entirely feasible. Our simulation study indicates that this tiny branching ratio can be measured with sub-percent precision at the HL-LHC. This decay channel can also constrain Standard Model extensions. Using the $ L_\mu-L_\tau$ model as a benchmark, we find that the current bound on the gauge coupling for $Z'$ mass in the range of $[4,75]$ GeV can be significantly improved.
Additionally, the branching ratio of the radiative $Z$ decay, $Z \to \mu^+ \mu^- \gamma$, has not been revisited since its initial measurement at LEP (only an upper bound). This simple 3-body decay channel can be measured within subpercentage level at the LHC and can uniquely constrain on axion-like particles (couple to muon) within $[5,85]$ GeV.
Speaker: Peiran Li (University of Minnesota) -
11:40
Reducing the PDF uncertainty in the extraction of $\sin^2 \theta_{eff}$ from the CMS measurements of the forward -backward asymmetry in Drell-Yan dileptons events at 13 TeV 20m
Presented by Hyon-San Seo
Recently, the CMS collaboration published measurements of the forward-backward asymmetry (angular coefficient $A_4(M)$)) in Drell–Yan dilepton production in proton-proton collisions at $\sqrt{s}=$ 13 TeV, and $\sin^2 \theta_{eff}$ was extracted from $A_4$ using a several parton distribution functions (PDFs). The PDF errors, as well as the differences between $\sin^2 \theta_{eff}$ values extracted using different PDF sets, are reduced by using PDF profiling which relies on the dilepton mass dependence of $A_4$. None-the-less even after profiling there is still a difference of one standard deviation between the values extracted with the CT18Z, NNPDF4.0 and MSHT20 PDF’s indicating that there is a residual difference in some of the parton distributions after $A_4$ profiling. In this presentation we report on the extraction of the EW mixing angle from the CMS measurement of $A_4$ with XFITTER using a large number of PDF sets , and investigate which PDF distributions are responsible for the residual difference, and if the difference can be reduced by including additional new data in the profiling including W+charm production at 13 TeV (which further constrains the $s-\bar s$ quark distribution) and charged lepton asymmetry in W decays at 13 TeV (which further constrains the $u-\bar u$ and $d-\bar d$ quark distributions).
Speaker: Dr Hyon-San Seo (University of Rochester) -
12:00
Electroweak Precision Measurements at the FCC-ee 20m
The FCC-ee program uniquely combines ultra–clean experimental conditions with precise center-of-mass energy calibration—from the Z pole through the top-quark pair threshold—and extraordinarily large event samples of Z and WW bosons. This combination unlocks both direct and indirect probes of physics beyond the standard model through:
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High-precision electroweak measurements in neutral and charged currents, yielding unprecedented determinations of observables such as the effective weak mixing angle, W- and Z-boson masses, and the top-quark mass.
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Direct extractions of fundamental couplings, including the strong coupling constant (αₛ) and the fine-structure constant (α), to levels of precision never before achieved.
To fully exploit the statistical precision, a concerted effort is underway to enhance detector performance, refine analysis strategies, and advance
theoretical calculations—thereby driving systematic uncertainties down to meet the tiny statistical uncertainties anticipated.Speaker: Christoph Paus (Massachusetts Inst. of Technology (US)) -
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Parallel: Future Colliders 3 Lecture Hall
Lecture Hall
Convener: Isobel Ojalvo (Princeton University (US))-
11:00
Overview of the FCC Program 20m
The Future Circular Collider (FCC) is a visionary international endeavor aimed at pushing the frontiers of particle physics beyond the capabilities of the LHC. This talk provides an overview of the FCC program, including its scientific goals, technological challenges, and implementation strategy. From precision studies of the Higgs boson to the exploration of new physics at unprecedented energies, the FCC represents a long-term roadmap for the next generation of high-energy colliders.
Speaker: Sarah Eno (University of Maryland (US)) -
11:20
BSM physics opportunities at the FCC-ee [Zoom] 20m
The electron-positron stage of the Future Circular Collider (FCC-ee) is a precision frontier factory for Higgs, electroweak, flavour, top quark, and QCD physics. It is designed to operate in a 91-km circular tunnel built at CERN, and will serve as the first step towards O(100 TeV) proton-proton collisions. In addition to an essential Higgs program, the FCC-ee offers unique and powerful opportunities to answer fundamental open questions and explore unknown physics beyond the Standard Model. Direct searches for long-lived particles, and indirect probes of new physics sensitive to several tens of TeV scale, will be particularly fertile in the high-luminosity Z run, where $8×10^{12}$ Z bosons are expected. The large data samples of Higgs bosons, W bosons, and top quarks in very clean experimental conditions will offer additional opportunities for discoveries at other collision energies. Three concrete physics cases with promising signatures at FCC-ee will be discussed: heavy neutral leptons (HNLs), axion-like particles (ALPs), and exotic decays of the Higgs boson. These three well-motivated cases motivate out-of-the-box optimization of experimental conditions and analysis techniques that could lead to improvements in other searches for new physics.
Speaker: Rhitaja Sengupta (BCTP and Physikalisches Institut der Universität Bonn, Germany) -
11:40
The Physics Potential of FCC-hh 20m
The Future Circular Collider in hadron-hadron mode (FCC-hh) represents the next major step in energy-frontier particle physics, targeting proton-proton collisions at a center-of-mass energy of 85 TeV. Building on the legacy of the LHC, FCC-hh would enable a vast extension of the discovery and precision frontier, offering an unparalleled opportunity to deepen our understanding of the fundamental constituents and forces of nature. At the heart of its physics program is the exploration of the Higgs sector, including precision measurements of the Higgs self-coupling and rare decay modes, as well as searches for deviations from Standard Model expectations. FCC-hh will dramatically expand the mass reach for new particles with sensitivities extending well beyond the capabilities of current and other planned facilities.
Speaker: gregorio bernardi (LPNHE University of Paris 6 & 7) -
12:00
Detector Challenges at a Muon Collider 20m
Detector Challenges at a Muon Collider
Speaker: Karri Folan Di Petrillo (University of Chicago) -
12:20
Pixel-based BIB suppression and DAQ impact at a multi-TeV Muon Collider 20m
The muon collider stands out as a compelling option for future high-energy physics experiments, combining unique physics potential with significant technical challenges. One of the most critical issues is the intense beam-induced background (BIB) from muon decays, which produces low-momentum particles that lead to high detector occupancies, complicating vertexing, tracking, and overwhelming simulation resources and readout systems. This talk presents recent advances in BIB mitigation through a detailed pixel-level analysis within the official Muon Collider software framework. A central strategy is the development of a novel cluster shape analysis, leveraging correlations among pixel cluster size, charge, incidence angle, and timing to distinguish signal from background. In parallel, we investigate the impact of increased active sensor thickness - trading some precise timing resolution for improved charge deposition from minimum-ionizing muons, which enhances separation between signal and soft BIB secondaries. This enables more effective rejection of background hits through optimized thresholds and refined shape-based filtering. We demonstrate the combined impact of these techniques in reducing BIB hit rates and data bandwidth, while preserving high signal efficiency in track reconstruction. Preliminary results from high-statistics simulation will be presented, along with insights into expected readout rates, dead time, power budgets, and the potential for a simplified trigger scheme.
Speaker: Angira Rastogi (Lawrence Berkeley National Lab. (US))
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Parallel: Neutrino Physics 5 Room H
Room H
Convener: Dr Mark Patrick Hartz (TRIUMF & Kavli IPMU, University of Tokyo)-
11:00
Measuring long-baseline neutrino oscillations with NOvA experiment 20m
The NOvA experiment is a long-baseline accelerator neutrino experiment designed to study neutrino oscillations and interactions with high precision. Utilizing an intense beam of muon neutrinos and antineutrinos produced at Fermilab, NOvA employs two functionally identical detectors: a Near Detector (ND) located close to the beam source and a Far Detector (FD) situated 810 kilometers away in northern Minnesota. This configuration enables the measurement of oscillation parameters by comparing the energy spectra and flavor composition of neutrinos observed at both sites. The Near Detector plays a critical role in characterizing the unoscillated beam and provides detailed data on neutrino interactions, essential for reducing systematic uncertainties in oscillation analyses. In this talk, we will present NOvA results on oscillation parameters as well as new insights from interaction studies in the Near Detector.
Speaker: Gregory Pawloski (University of Minnesota) -
11:20
Neutrino oscillation measurements from T2K 20m
T2K is a long-baseline neutrino oscillation experiment, measuring the oscillation of neutrinos and antineutrinos produced at J-PARC facility which then travel 295 km across Japan to its far detector, SuperKamiokande. T2K has been taking data since 2009 and sets world-leading constraints on many neutrino oscillation parameters within the standard PMNS three-flavour mixing paradigm, including offering hints that the CP-violating phase (dcp) favours non CP-conserving values. In this talk, T2K’s latest analysis of neutrino oscillations will be presented. This analysis includes the presence of new and improved event samples at the near and far detectors as well as a significant update to the treatment of systematic uncertainties on neutrino interactions and the near detector response. Prospects for future analyses with significantly improved statistics, thanks to an increasing beam power, and the use of T2K’s newly installed near detector upgrade will also be shown.
Speaker: Jaafar Chakrani (Lawrence Berkeley National Lab. (US)) -
11:40
The ESSnuSBplus project: Status and progress 20m
ESSnuSB is a design study for a long-baseline neutrino experiment to precisely measure the CP violation in the leptonic sector, at the second neutrino oscillation maximum, using a beam driven by the uniquely powerful ESS linear accelerator. The ESSnuSBplus design study programme, which is an extension phase of the ESSnuSB project, aims in designing two new facilities, a Low Energy nuSTORM and a Low Energy Monitored Neutrino Beam to use them to precisely measure the neutrino-nucleus cross-section in the energy range of 0.2 – 0.6 GeV, where the experimental data is very scarce. In addition, a new target station and a new water Cherenkov near-near detector will be designed to measure cross sections and serve to explore the sterile neutrino physics.
An overall status of the project will be presented together with the ESSnuSB+ additions.Speaker: Georgios Fanourakis (Nat. Cent. for Sci. Res. Demokritos (GR)) -
12:00
Recent results from SND@LHC 20m
SND@LHC is a recent, stand-alone experiment operating at the LHC to perform neutrino measurements. It is located 480m from IP1 in the TI18 tunnel, spanning the unexplored forward region 7.2<𝜂<8.6. Its hybrid detector is composed of 800kg tungsten target-plates, interleaved with emulsion and electronic trackers, followed by a calorimeter and a muon system. This allows to identify all three neutrino flavors, and in turn to perform unique tests of lepton universality, and to probe heavy flavor production in a pseudo-rapidity region not accessible to ATLAS, CMS and LHCb. This region is of particular interest also for future circular colliders and for studies of very high-energy atmospheric neutrinos. The detector is also well suited to search for Feebly Interacting Particles in scattering signatures. The experiment has been running successfully since the start of LHC Run3 in 2022 and has published several results. This talk will present recent results obtained with the collected dataset, along with the physics prospects with full Run3 and for the HL-LHC phase.
Speaker: Federico Ronchetti (EPFL - Ecole Polytechnique Federale Lausanne (CH)) -
12:20
The PTOLEMY experiment: Direct Detection of the Cosmic Neutrino Background 20m
The PTOLEMY collaboration's ultimate goal is the first direct observation of the Cosmic Neutrino Background (CNB). As an essential milestone, we present the status and physics reach of the PTOLEMY-LNGS demonstrator now under construction at the Gran Sasso. The experiment utilizes a solid-state atomic tritium target, CRES-based background reduction, a new type of compact and scalable EM spectrometer, and transition edge sensor (TES) microcalorimetry to deliver 50 meV resolution in a room-sized space. A three-year demonstrator run will reach a neutrino-mass sensitivity of 150 meV (90% CL), more than a factor of two beyond current limits, and will establish the technique needed to scale to a 100g CNB target. We outline the project timeline, the strategy for sub-eV systematic control, and the complementarity of PTOLEMY's approach with KATRIN's MAC-E filter. By uniting novel materials, cryogenic calorimetry, and magnetic-drift optics, PTOLEMY opens a realistic path from precision beta-decay spectroscopy to the first glimpse of relic neutrinos from the Big Bang.
Speaker: Wonyong Chung (Princeton University (US))
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Parallel: Hadron Physics 3 Room KLOP
Room KLOP
Convener: Rukmani Mohanta-
11:00
Spin and symmetry properties of all-charm tetraquarks 20m
The traditional quark model accounts for the existence of baryons, like protons and neutrons, which consist of three quarks, as well as mesons, composed of a quark and antiquark pair. Only recently has substantial evidence started to accumulate for exotic states composed of four or five quarks or antiquarks. In this study, the CMS Collaboration investigates the recently discovered family of three tetraquark candidates composed of four charm quarks and antiquarks. The exact nature of their internal structure remains uncertain. They could either be tightly bound states of true tetraquarks, similar to quarks bound within protons and neutrons, or molecules composed of two familiar mesons, loosely bound like protons and neutrons in a nucleus, with other potential configurations still being considered. Angular analysis techniques for decay products, developed for the discovery and characterization of the Higgs boson, are now being applied to the new exotic states. The quantum numbers for parity P and charge conjugation C symmetries are found to be +1. The spin J of these exotic states is most consistent with J = 2h, a value that is uncommon for such particles, while the J = 0h and 1h are excluded at 95% and 99% confidence level, respectively. The J^PC = 2++ quantum numbers match the expected values for tetraquarks with specific configurations of spin and angular momenta of its components, which helps in narrowing down the tetraquark’s internal structure.
Speaker: Zhiyuan Huang (Johns Hopkins University (US)) -
11:20
Search for charm rare decays at BESIII 20m
The BESIII experiment has collected 2.6 billion $\psi(3686)$ events, 10 billion $J/\psi$ events, 20 $fb^{-1}$ of D meson pairs at 3.773 GeV, and 7.33 $fb^{-1}$ of $D_sD_s^*$ events from 4.128 to 4.226 GeV. These huge data samples allow us to search for rare processes in charm hadron decays.
In this talk, we report the search of the FCNC decays $J/\psi \to D^0 \mu^+ \mu^-$ and $D_s^+ \to h(h')e^+ e^-$. The searches for $J/\psi$ weak decays containing a D meson and for $J/\psi \to \gamma D^0$ will also be presented.
In addition, we will introduce the search for baryon number violation via $\Lambda-\bar{\Lambda}$ oscillation in $J/\psi \to \Lambda \bar{\Lambda}$ decay, and the search for lepton number violation processes $D_s^+ \to h^-h^0e^+e^+$ and $\phi \to \pi^+\pi^+e^-e^-$.Speaker: Tianzi Song (Sun Yat-Sen University (CN)) -
11:40
Spectroscopy of Strange Mesons with COMPASS 20m
While the excitation spectrum of light mesons, which are composed of up and down quarks, is already mapped out fairly well, the spectrum of strange mesons is still to be mapped out in detail, potentially holding many surprise.
At the COMPASS experiment at CERN, we study the strange-meson spectrum in the diffractive scattering of a high-energy kaon beam.
In this talk we will focus on the $K^-\pi^-\pi^+$ final state, for which COMPASS has acquired the world's largest data set to date.
Based on this data set, we have performed a partial-wave analysis to disentangle the produced mesons by their spin-parity quantum numbers and to measure their masses and widths.
We will report on recent results from this analysis, including the first candidate for a crypto-exotic strange meson with $J^P=0^-$.Speaker: Stefan Wallner (MPP (Munich)) -
12:00
Exotic hadronic states at LHCb [Zoom] 20m
Thanks to the exellent detector performance and the unprecedented yield of all sorts of heavy flavour hadrons, LHCb have discovered a plethora of new hadronic states, many of which cannot fall into the conventional picture of quark model. This talk will report on the latest highlights of exotic states at LHCb, including pentaquark and tetraquark candidates.
Speaker: Liming Zhang (Tsinghua University (CHINA))
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Special Events: Early Career Discussion Grand Terrace
Grand Terrace
Conveners: Jakob Moritz (University of Wisconsin Madison (US)), Prof. Mariel Pettee (University of Wisconsin--Madison) -
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Parallel: Future Colliders 4 Lecture Hall
Lecture Hall
Convener: Sergo Jindariani (Fermi National Accelerator Lab. (US))-
14:00
Higgs physics at a 10 TeV Muon Collider 20m
This contribution discusses the physics potential of a future muon collider operating at a center-of-mass energy of $\sqrt{s}$ = 10 TeV for precision studies in the Higgs sector. Using a detailed detector simulation that incorporates the dominant sources of machine-induced background, the expected sensitivity to key Higgs processes is evaluated. These include the measurement of production cross sections for $H \to b\bar{b}$, $H \to WW^\ast$, and double-Higgs production $HH \to b\bar{b}b\bar{b}$. A central focus of the study is the determination of the Higgs boson trilinear self-coupling, a critical parameter for understanding the structure of the Higgs potential and electroweak symmetry breaking. The analysis is based on the MUSIC (MUon System for Interesting Collisions) detector concept, specifically optimized for the muon collider environment, and assumes an integrated luminosity of 10 ab$^{-1}$ collected over five years. The results presented highlight the exceptional prospects of a multi-TeV muon collider for exploring the Higgs potential with a level of precision unattainable by any other proposed future collider within a comparable timeframe.
Speaker: Leonardo Palombini (INFN-Padova, Italy) -
14:20
Absolute Higgs boson cross section, mass, and width at FCC-ee 20m
The FCC-ee programme is uniquely positioned to provide unprecedented precision on the fundamental properties of the Higgs boson. At the center-of-mass energies 240 and 365 GeV, the FCC-ee will produce millions of Higgs bosons via Higgs-strahlung and vector boson fusion. The clean experimental environment allows a model-independent measurement of the absolute ZH cross-section to better than per-mil accuracy, directly determining the Higgs coupling to Z bosons. Utilizing the recoil-mass technique in leptonic and hadronic Z decays, the Higgs boson mass will be measured with a precision of a few MeV. Combining these measurements with precise determinations of exclusive branching ratios will yield the total Higgs width at percent-level precision. These measurements will significantly advance our understanding of the Standard Model and guide the search for new physics.
Speaker: Ang Li (Brookhaven National Laboratory (US)) -
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Discussion about Future Colliders 40mSpeakers: Grace Cummings (Fermi National Accelerator Lab. (US)), Dr Innes Bigaran (Fermilab and Northwestern University)
- Everyone generally is excited, but there are concerns:
- setting limits indefinitely
- With only one collider with the higgs as a driver, limited other analysis opps are scary
- funding
- People come to future colliders from different places
- some folks motivated by instrumentation, others physics
- Folks want room for exploration and play
- LHC experiments corporate
- Folks need the time to ponder future colliders
- Existential threats (being able to eat, pay rent, buy houses) are effecting young people -- physics less important than these things
- all physics need airtime (b-physics at FCC specifically)
- Science needs to remain open, and international coop important and needed
- Everyone generally is excited, but there are concerns:
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Parallel: Jets and Taus Room E
Room E
Convener: Robert Harris (Fermi National Accelerator Lab. (US))-
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Advancements in Tau Reconstruction and Identification at the CMS Detector 20m
Tau leptons play a crucial role in studying electroweak processes, both in the Standard Model of particle physics and in searches for new physics. Accurate reconstruction and identification of tau leptons are essential in a high energy physics experiment. This talk presents DeepTau, the tau identification algorithm based on convolutional neural network (CNN), designed to reduce the misidentification probability of jets, muons and electrons while precisely tagging the hadronically decaying tau leptons reconstructed by the Hadron-plus-strip algorithm. The recently deployed version of DeepTau significantly enhances the performance in both efficiency and purity of tau identification as well as the robustness against mismodeling in simulation, w.r.t the previous version, by applying domain adaptation techniques through adversarial machine learning. Alternative approaches to identify hadronically decaying tau leptons as a jet flavor using universal jet taggers relying on Graph Neural Networks or Particle Transformers are also addressed. Additionally, dedicated reconstruction and identification techniques for displaced tau leptons coming from the decay of long-lived stau particles, using Graph Convolutional Neural Networks, are discussed.
Speaker: Pritam Palit (Carnegie-Mellon University (US)) -
14:20
New techniques for reconstructing and calibrating hadronic objects with ATLAS 20m
The precision and reach of physics analyses at the LHC is often tied to the performance of hadronic object reconstruction & calibration, with any incremental gains in understanding & reduced uncertainties being impactful on ATLAS results. Recent refinements to the reconstruction and calibration procedures for jets & missing energy by the ATLAS collaboration has resulted in reduced uncertainties, improved pileup stability and overall performance gains. In this contribution, highlights of these developments will be presented.
Speaker: Benjamin Sterling Lunday -
14:40
Classifying hadronic objects in ATLAS with ML/AI algorithms 20m
Hadronic object reconstruction & classification is one of the most promising settings for cutting-edge machine learning and artificial intelligence algorithms at the LHC. In this contribution, highlights of ML/AI applications by ATLAS to QCD and boosted-object identification, MET reconstruction and other tasks will be presented.
Speaker: Leonardo Toffolin (Universita e INFN Trieste (IT))
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Parallel: Astrophysics 4 Room J
Room J
Convener: Walter Winter-
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A Comprehensive Diffuse Neutrino Search Using the Full Askaryan Radio Array 20m
The Askaryan Radio Array (ARA) is a neutrino experiment at the South Pole, designed to detect radio-frequency emissions produced by interactions of ultra-high energy (UHE) neutrinos with the Antarctic ice. The array consists of five autonomous stations, each equipped with deep in-ice antennas sensitive to both vertically and horizontally polarized radio signals. With nearly 30 station-years of livetime accumulated, ARA is now conducting its first comprehensive array-wide search for diffuse UHE neutrinos. This analysis is expected to deliver the most stringent constraints from any in-ice radio-based detector up to 1000 EeV and is capable of probing flux levels suggested by KM3NeT around 220 PeV. The results from this analysis mark a critical step toward establishing scalable techniques for next-generation detectors.
Speaker: Pawan Giri -
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Observation of the multi‐flavour extragalactic diffuse high‐energy neutrino flux with IceCube 20m
Over the past decade, neutrino astronomy has evolved into a precision tool for probing the high-energy universe. Here we present an updated characterization of the extragalactic diffuse neutrino flux measured by the IceCube Neutrino Observatory, spanning energies from a few TeV to beyond 10 PeV. Using ten years of full-sky data, we identify the first Glashow-resonance candidate — an electron antineutrino interacting via on-shell W- decay. We also report IceCube’s most precise flavour ratio measurements to date, including the identification of high-energy tau neutrino candidates. In addition, we observe a possible deviation from a single power-law in the diffuse flux, suggesting curvature or a spectral break near a few tens of TeV.
Speaker: Lu Lu (University of Wisconsin-Madison) -
14:40
HUNT : An ultra-large-scale neutrino astronomy telescope 20m
In 2021, LHAASO observed a large number of cosmic ray candidates in the Milky Way. We proposed to build a huge telescope with at least 30 times the sensitive volume of the IceCube detector, so as to observe the LHAAASO sources. In order to realize this project, we innovatively put forward a photosensitive detector unit based on a photomultiplier tube with a maximum photosensitive area of 20 inches. We have deployed some prototypes in Lake Baikal and South China Sea respectively. It is estimated that within three years, we will complete the R&D work of the project.
Speaker: Mingjun Chen -
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Selecting Hadronic Supernova Remnants for Targeted Galactic Neutrino Searches 20m
Neutrinos provide unambiguous evidence of cosmic-ray (CR) acceleration in supernova remnants (SNRs), as they are produced exclusively in hadronic interactions. Detecting neutrinos from a SNR would offer direct confirmation of CR proton interactions and energy distributions. In this work, we conduct a comprehensive survey of Galactic SNRs to identify the most promising hadronic candidates. For this subset, we model the expected neutrino spectra and compile a prioritized source list for a future IceCube stacking analysis. Excluding leptonic-dominated SNRs from IceCube analyses is crucial for improving the signal-to-noise ratio and has the potential to enable the first detection of Galactic SNRs in neutrinos.
Speaker: Emily Simon
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Parallel: Computing AI/ML 2 Room I
Room I
Convener: Garrett Merz (UWisconsin-Madison)-
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Development of LLMs for DUNE 20m
The Deep Underground Neutrino Experiment (DUNE) is a long-baseline neutrino experiment aimed at addressing fundamental questions such as the matter-antimatter asymmetry in the universe. Currently, DUNE relies on multiple platforms to store internal documentation, including DocDB, Indico (hosted by Fermilab), and EDMS (hosted by CERN). Retrieving relevant historical information—especially from Indico, which requires navigation through multiple subpages and events—can be particularly challenging. In this talk, I will present efforts to develop a dedicated Large Language Model (LLM) tailored for the DUNE collaboration. This LLM integrates content from various DUNE databases into a unified system. When queried, it not only provides relevant responses but also includes accurate reference links to original sources. The tool is designed to streamline access to DUNE-specific information and has the potential to be extended for efficient data analysis in the future.
Speaker: Aleena Rafique (Argonne National Laboratory) -
14:20
HGPflow: Hypergraph learning for full event reconstruction at pp and e+e- colliders 20m
Particle flow reconstruction algorithms are fundamental for physics analysis at collider experiments. Improving these algorithms with deep learning presents a unique chance to enhance experimental sensitivity at the LHC and future facilities. This talk presents HGPflow, a deep learning method using hypergraphs that offers a physics-motivated framework for the energy assignment task in particle reconstruction. We show that HGPflow can reconstruct full proton-proton and electron-positron collisions, yielding benefits in both precision and interpretability over current methods. We also underscore the importance of maintaining locality when training with full collision events and suggest a technique to ensure the model avoids learning global event topologies.
Speakers: Etienne Dreyer (Weizmann Institute of Science (IL)), Francesco Armando Di Bello (INFN e Universita Genova (IT)), Nilotpal Kakati (Weizmann Institute of Science (IL)) -
14:40
Synthetic Training and Representation Bridging in Reconstruction Domains 20m
Reconstructing low-dimensional truth labels from high-dimensional detector data is a central challenge in any experiment that relies on robust mappings across this so-called domain gap, from multi-particle final states in high-energy physics to large-scale early-universe structure in cosmological surveys. We introduce a new method to bridge this domain gap with an intermediate, synthetic representation of truth that differs from methods operating purely in latent space, such as normalizing flows or invertible approaches, in that the synthetic data is specifically engineered to represent intrinsic detector hardware capabilities of the system at hand. By encoding physical properties of the detector response available only in full simulation, such synthetic representations result in a less lossy compression and recovery than a direct mapping from truth to experimental data. We demonstrate this concept with full simulation of a dual-readout crystal electromagnetic calorimeter for future colliders, in which the synthetic data is constructed to be the simulated detector hits corresponding to photon tracks of scintillation and Cerenkov photons. We refer to these signals as simulated observables as they would not be physical observables in a real detector, but are nonetheless representations of a real physical process. We show that the synthetic representation naturally anchors the neural network architecture to a known physical method, in this case the dual-readout correction, opening new avenues for machinistic interpretability and explainability of ML methods in physics.
Speaker: Wonyong Chung (Princeton University (US)) -
15:00
New Physics Searches at the LHC through Event based Anomaly Detection and Development of ADFilter Web-tool 20m
This work presents advancements in model-agnostic searches for new physics at the Large Hadron Collider (LHC) through the application of event-based anomaly detection techniques utilizing unsupervised machine learning. We discuss the advantages of Anomaly detection approach, as demonstrated in a recent ATLAS analysis, and introduce ADFilter, a web-based tool designed to process collision events using autoencoders based on deep unsupervised neural networks. ADFilter calculates loss distributions for input events, aiding in determining the degree to which events can be considered anomalous. Real-life examples are provided to demonstrate how the tool can be used to reinterpret existing LHC results, with the goal of significantly improving exclusion limits. Furthermore, we present a comparative study between anomaly detection and supervised machine learning techniques, using the search for heavy resonances decaying into two or more Higgs bosons as a representative case to demonstrate the application and effectiveness of these methods.
Speaker: Wasikul Islam (University of Wisconsin-Madison (US))
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Parallel: Dark Sectors at Colliders 3 Room H
Room H
Convener: Tulika Bose (University of Wisconsin Madison (US))-
14:00
Hunting the dark-Higgs: A search for a dark-Higgs boson in the 4b+MET final state at $\sqrt(s)=13$ TeV with the ATLAS detector 16m
The Standard Model of particle physics, while remarkably successful in describing most phenomena related to the fundamental interactions and particles, notably lacks a mechanism to account for dark matter, prompting a wealth of beyond the Standard Model (BSM) theories that propose various candidates and interactions. One such theory is the dark Higgs boson model. This model introduces three additional states: the dark matter candidate; a dark Higgs boson responsible for giving mass to the dark matter candidate; and a heavy spin-1 mediator ($Z'$). It is able to reproduce the observed relic density naturally. A search for a di-Higgs resonance will be presented, with each Higgs decaying to two b-jets, paired with significant missing transverse momentum (MET), in 140/fb of $pp$ collision data recorded by the ATLAS experiment at $\sqrt(s)=13$ TeV. This signature provides the first sensitivity for the process where the $Z'$ radiates a dark Higgs, the $Z'$ decays to two dark matter particles, and the dark Higgs into two Higgs bosons, likely for a sufficient dark Higgs mass. A specialised neural network approach is used, decorrelated with the di-Higgs mass (a proxy for the dark Higgs mass), to enhance the sensitivity of our search, enabling the analysis to probe the previously unexplored parameter space of high $Z'$ and dark-Higgs masses.
Speaker: Tom Dingley (University of Oxford (GB)) -
14:16
Probing new physics with dedicated data streams at CMS 16m
Signatures of new physics at the LHC are varied and by nature often very different from those of Standard Model processes. Novel experimental techniques, including dedicated datastreams are exploited to boost the sensitivity of the CMS Experiment to search for such signatures. In this talk we highlight the most recent CMS results, obtained using the data collected at the LHC Run-II through the so-called “Data Scouting” and “Data Parking” strategies. These approaches have allowed to set some of the strongest constraints to date for low mass resonances in prompt and long-lived signatures.
Speaker: Jacopo Pazzini (Università e INFN, Padova (IT)) -
14:32
Search for new physics in final states with semi-visible jets or anomalous signatures using the ATLAS detector 16m
A search is presented for hadronic signatures of beyond the Standard Model (BSM) physics, with an emphasis on signatures of a strongly-coupled hidden dark sector accessed via resonant production of a Z' mediator using 140/fb of Run 2 pp collision data at 13 TeV. The Z' mediator is considered to decay to two dark quarks, which each hadronize and decay to showers containing both dark and Standard Model particles, producing a topology of interacting and non-interacting particles within a jet known as ``semi-visible". Machine learning methods are used to select these dark showers and reject the dominant background of mismeasured multijet events, including an anomaly detection approach to preserve broad sensitivity to a variety of BSM topologies
Speaker: Ki Ryeong Park (Columbia University (US)) -
14:48
Searching solo for the invisible at CMS 16m
Determination of the nature of dark matter is one of the most fundamental problems of particle physics and cosmology. This talk presents recent searches for dark matter particles from the CMS experiment at the Large Hadron Collider in mono-X signatures. This talk will discuss the first search using the low-multiplicity jet signature at the LHC and supervised machine learning and data augmentation techniques used to enhance signal sensitivity and other searches targetting the collider dark matter signatures.
Speaker: Abhishikth Mallampalli (University of Wisconsin Madison (US)) -
15:04
Shedding Light on Dark Matter via the Higgs Portal 16m
Searches for particles that account for the Dark Matter in the Universe, which interact only through their couplings with the Higgs sector of the theory, the so-called Higgs-portal models, will be discussed. The analysis is performed using singly produced b-jet pairs, consistent with Higgs mass, recoiling from missing transverse momentum.
Speaker: SHIVANI LOMTE
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Parallel: Exotic Searches 3 Room KLOP
Room KLOP
Convener: Federico Leo Redi (Università degli Studi e INFN Milano (IT))- 14:00
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14:25
Searches in CMS for new physics in final states with leptons 15m
Many new physics models, such as the Sequential Standard Model, Grand Unified Theories, models of extra dimensions, or models with eg. leptoquarks or vector-like leptons, predict heavy mediators at the TeV energy scale. We present recent results of such searches in leptonic final states obtained using data recorded by the CMS experiment during Run-II of the LHC.
Speaker: Anureet Kaur Anureet Kaur (Panjab University, Chandigarh) -
14:40
Searches for new physics using leptons with the ATLAS detector 15m
The Standard Model of Particle Physics explains many natural phenomena yet remains incomplete. Many new physics models (such as leptoquarks, W'/Z', or heavy neutral leptons) could manifest in final states involving multiple leptons. This talk will summarise the latest results from ATLAS in searches involving final states with leptons.
Speaker: Jack Harrison (Institut de Física d’Altes Energies (IFAE)) -
14:55
Search for proton decay into a single charged antilepton and a massless invisible particle using the full pure water data set of Super-Kamiokande 20m
Grand Unified Theories (GUTs) viewed as the extension of Standard Model (SM) are proposed and unify the strong, weak, and electromagnetic interactions at the order of $10^{15}$-$10^{16}$ GeV which is unreachable by accelerators. Since the three interactions are described by a single coupling constant in the GUTs, the violation of baryon number is allowed, and rare processes such as proton decay are predicted as one of the most important signatures. To probe the processes, Super-Kamiokande (SK) is a large water Cherenkov detector which is designed for precise observation of neutrinos and search for proton decay.
In order to search for the direct evidence of GUTs, two simplest general 2-body decays are considered. We search for $p→l^{+}+X$ (where $l^{+}$ is a positron or an antimuon, and $X$ is a neutral massless and invisible particle) using the entire pure water detector phase of SK (0.401 Mton∙year). By performing a spectral fit technique, new results are set for $p→e^{+}+X$ and $p→μ^{+}+X$, respectively.
Speaker: Yu-Ming Liu
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14:00
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Parallel: Top Physics 3 Room G
Room G
Convener: Prof. Kevin Black (University of Wisconsin-Madison)-
14:00
ATLAS results at the ttbar threshold 20m
The exceptionally large dataset collected by the ATLAS detector at the highest proton-proton collision energies provided by the LHC enables precision testing of theoretical predictions using an extensive sample of top quark events. This wealth of data has opened the door to new measurements of top quark properties including those particularly sensitive to the ttbar threshold region, such as quantum entanglement, which were previously beyond reach. This contribution presents the latest highlights in this area from the ATLAS top quark physics
Speaker: Yoav Afik (University of Chicago (US)) -
14:20
EFT based searches in the top quark sector 20m
Effective Field Theory (EFT) provides a universal framework for probing beyond the Standard Model physics at LHC scales. Recent advances in analysis techniques and increased dataset complexity have significantly enhanced the sensitivity of EFT studies, allowing for the exploration of previously untested couplings, including CP violation and the SM flavor structure. This talk will present the latest searches for anomalous couplings in the top quark sector and their combinations. These results mark a substantial improvement in precision compared to earlier measurements and pave the way for fully harnessing the potential of LHC data in the quest for new physics.
Speaker: Mr Santosh Bhandari (Purdue University (US)) -
14:40
ATLAS EFT results in the top sector [Zoom] 20m
Many-parameter fits to precise measurements in the framework of the Standard Model Effective Field Theory are becoming a standard interpretation of LHC and other collider data. In this contribution an overview is given of state-of-the-art EFT interpretations in ATLAS with particular emphasis on results in the top quark sector.
Speaker: Rui Zhang (Nanjing University (CN)) -
15:00
Measurements of rare top production and their BSM interpretations 20m
The study of rare top quark production modes opens the gate to a number of new physics models that introduce large contributions to them. As an example, the production of four top quarks could be affected by the direct or indirect production of top-philic heavy resonances or be modified by anomalous Yukawa interactions between the top quark and the Higgs boson. A set of measurements is presented searching for rare top quark production and for new physics effects enhancing rare top quark processes.
Speaker: Ricardo Escobar Franco (University of Illinois Chicago (US))
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Afternoon Break 30m
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17:50
Plenary: Thursday Lecture Hall
Lecture Hall
Monona Terrace
Convener: Dmitri Denisov (Brookhaven National Laboratiry)-
15:50
CKM and CP violation at the LHC 30m
I am presenting the recent status of CKM element measurements and of CP violation searches in meson studies of the Beauty and Charm sectors and in the Top sector. The results are from the ATLAS, CMS and LHCb experiments of the LHC. Prospects for the years ahead will be also discussed.
Speakers: Vaia Papadimitriou, Dr Vaia Papadimitriou (Fermi National Accelerator Lab. (US)) -
16:20
Time-independent CP asymmetries 30mSpeaker: Alexander Leon Gilman (University of Cincinnati (US))
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16:50
Semi-leptonic decays 30mSpeakers: Guglielmo De Nardo, Guglielmo De Nardo (University Federico II and INFN, Naples (IT))
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17:20
Invisible Cities: Imagining the next era of AI-enabled fundamental physics research 30m
Some of the most exciting fundamental physics discoveries in recent years emerged thanks to large-scale experimental collaborations that radically differed from conventional scientific practices a century ago. The recent success of large-scale AI models trained on highly diverse data sources begs the question: could our scientific conventions yet again be restricting our access to major discoveries? In this talk, I propose that broadening our analyses across datasets, detectors, and even scientific disciplines could be critical to finally answering the grand mysteries of our Universe that have thus far eluded our usual strategies. To achieve this vision, AI methods can help us publish detector-agnostic datasets, construct richer embeddings of our data, and highlight connections across varied domains -- but we also need to take care to ensure that we design these tools to uphold our highest priorities as scientists.
Speaker: Mariel Pettee (Lawrence Berkeley National Lab. (US))
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Poster: Beer-battered Posters Room MNQR
Room MNQR
Monona Terrace
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18:00
How Matter Matters: The Story of Time Invariance Violation in Neutrino Oscillations 5m
While neutrino oscillations provide a well motivated probe for CP violation, non-trivial matter effects and our inability to build experiments in an anti-Earth limits our studies to improper tests of its effects. These limitations in turn motivate (from CPT theorem) time invariance studies, as under certain matter potential profiles, proper time invariance and improper time invariance are the same. With this in mind, the following talk will focus on revisiting the pedagogical study of time invariance in matter-based neutrino oscillations, providing potential consequences in the case where we have a new beam source (i.e. muon storage rings) which would allow for an experiment to make time invariance channel comparisons. We discuss the above for different types of matter potential profiles, in an effort to distinguish between intrinsic and matted-induced time invariance violation, if at all, in neutrino oscillation probabilities.
Speaker: Olivia Bitter -
18:00
Topological aspects of particle production, and it's applications to early universe cosmology 5m
We study topological aspects of particle production using Stokes phenomenon. An explicit map between the standard $\beta$-coefficient computation, and Stokes constants from the perspective of the F-matrix formalism is presented. In scenarios where the particle dispersion relation reduces, in the long wavelength limit $(k\rightarrow 0)$, to the form $z^n$ $(n \in \mathbb{Z}_{>0})$ in complexified time coordinate $z$, the corresponding mode equation satisfies a $\mathbb{Z}_{n+2}$ symmetry. This symmetry, combined with the F-matrix formalism fixes the Stokes constants and the $\beta$ coefficient as a simple trigonometric function of $n$. In our on-going work we attempt to extend the above computation to small non-zero values of k by computing the lowest order correction to the Stokes constant for scenarios where the mode equation retains a $Z_{n+2}$ symmetry. These corrections are then used to estimate the topological contribution, corresponding to $k\approx 0$, to the total particle production in two scalar field models of interest for early universe cosmology.
Speaker: NIDHI KANDATHPATINHARUVEETIL -
18:05
Optimization Studies for Target and Magnetic Capture Designs in Muon Collider Demonstrator 5m
This poster presents simulation studies aimed at optimizing the design of the graphite target and capture system for the Muon Collider demonstrator, potentially at Fermilab. Using the G4Beamline simulation framework, we model proton interactions with a graphite target to analyze charged pion production and capture along the target axis, categorizing production mechanisms (primary, secondary, tertiary) and investigating spatial distributions to understand where pions are generated and how they can be efficiently collected. A key focus is on evaluating the impact of target geometry on pion yield and capture efficiency. In parallel, the study explores optimization of the magnetic capture system with a realistic tapered solenoid configuration following an initial capture solenoid, aiming to improve overall collection and transport of pions toward the downstream decay channel. These simulation results will provide a detailed foundation for refining both target and capture system designs to maximize pion production and muon yield for demonstrator tests, supporting the development of an effective, efficient target system for future muon source applications.
Speaker: Cheng Hsu Nee (University of Wisconsin Madison (US)) -
18:05
Study of a Cosmic Ray Candidate Recorded with the Askaryan Radio Array 5m
Experiments designed to detect ultra-high energy (UHE) neutrinos using radio techniques are also capable of detecting the radio signals from cosmic-ray (CR) induced air showers. These CR signals are important both as a background and as a tool for calibrating the detector. The Askaryan Radio Array (ARA), a radio detector array, is designed to detect ultra-high-energy (UHE) neutrinos. The array currently comprises five independent stations, each instrumented with antennas deployed at depths of up to 200 meters within the ice at the South Pole.
In this study, we focus on a candidate event recorded by ARA Station 2 (ARA02) that shows features consistent with a downward-going CR-induced air shower. This includes distinctive double-pulse signals in multiple channels, interpreted as geomagnetic and Askaryan radio emissions arriving at the antennas in sequence. To investigate this event, we use detailed simulations that combine a modern impacting CR shower simulation framework (FAERIE) with a realistic detector simulation package (AraSim).\
We will present results for an optimization of the event topology, identified through simulated CR showers, comparing the vertex reconstruction of both the geomagnetic and Askaryan signals of the event, as well as the observed time delays between the two signals in each antenna.Speaker: Shoukat Ali (University of Kansas) -
18:10
Incorporating Physical Priors into Weakly-Supervised Anomaly Detection 5m
Weakly-supervised anomaly detection methods offer a powerful approach for discovering new physics by comparing data to a background-only reference. However, the sensitivity of existing strategies can be significantly limited by rare signals or high-dimensional, noisy feature spaces. We present Prior-Assisted Weak Supervision (PAWS), a novel machine-learning technique that significantly boosts search sensitivity by incorporating physical priors from a class of signal models into the weakly-supervised framework. PAWS pre-trains parameterized neural network classifiers on simulated signal events and then fine-tunes these models to distinguish data from a background reference, with the signal parameters themselves being learnable during this second stage. This approach allows PAWS to achieve the sensitivity of a fully-supervised search for signals within the pre-specified class, without needing to know the exact signal parameters in advance. Applied to the LHC Olympics anomaly detection benchmark, PAWS extends the discovery reach by a factor of 10 in cross section over previous methods. Crucially, PAWS demonstrates remarkable robustness to irrelevant noise features, unlike traditional methods whose performance degrades substantially. This work highlights the power of integrating domain knowledge into machine learning models for high energy physics, offering a promising path towards more sensitive and robust anomaly detection in jet-based searches and beyond.
Speaker: Alkaid Cheng (University of Wisconsin Madison (US)) -
18:10
Study of the Neutrino Magnetic Moment with the NOvA Near Detector 5m
The NuMI Off-Axis $\nu_e$ Appearance (NOvA) Experiment is a long baseline neutrino experiment consisting of two detectors, a Near Detector (ND) at Fermilab in Batavia, IL, and a Far Detector (FD) in Ash River, MN. The ND observes the unoscillated neutrino beam while the FD is able to observe neutrinos which have oscillated. Because the ND does not observe oscillated neutrinos, it works in tandem with the FD to provide control measurements. However, the ND has independent physics goals, such as observing processes which lead to physics beyond the Standard Model (BSM). One such process is the existence of a neutrino magnetic moment. At leading order, neutrinos do not interact electromagnetically, but, by considering higher order perturbative effects, it becomes possible for neutrinos to have an effective coupling with a photon such that a non-zero neutrino magnetic moment emerges. Measurement of the neutrino magnetic moment can aid in the process of determining if neutrinos are Dirac or Majorana fermions, as well as provide insights into BSM physics. In this talk, we discuss the NOvA ND’s capabilities for making a direct measurement of the neutrino magnetic moment.
Speaker: Sarah Choate (University of Iowa) -
18:15
FLUKA-Based Optimization of Muon Production and Radiation Shielding for Muon Collider Demonstrator 5m
This study investigates the optimization of pion and muon yields from an 8GeV proton beam incident on a graphite target, as part of a design effort for a muon collider demonstrator. The primary objective is to determine the optimal geometric configuration between the target and a solenoidal capture channel to maximize secondary particle production while mitigating potential damage from residual high-energy protons downstream. The current design features a 2m long, 0.7m radius solenoid with a peak magnetic field of 5T. We explore variations in the beam and target positioning, including tilt angles and impact parameters, to identify configurations that enhance particle capture efficiency. In parallel, we evaluate radiation fluence, particularly neutron flux and energy deposition, to ensure the superconducting solenoid remains protected from localized heating that could trigger a quench. This work supports the development of high-yield, damage-resilient front-end systems for future muon collider facilities.
Speaker: Ruaa Al-Harthy (University of Wisconsin Madison (US)) -
18:15
The ATLAS Trigger System 5m
The ATLAS experiment in the LHC Run 3 uses a two-level trigger system to select events of interest to reduce the 40 MHz bunch crossing rate to a recorded rate of up to 3 kHz of fully-built physics events. The trigger system is composed of a hardware based Level-1 trigger and a software based High Level Trigger. The selection of events by the High Level Trigger is based on a wide variety of reconstructed objects, including leptons, photons, jets, b-jets, missing transverse energy, and B-hadrons in order to cover the full range of the ATLAS physics programme.
We will present an overview of improvements in the reconstruction, calibration, and performance of the different trigger objects, as well as computational performance of the High Level Trigger system.Speaker: Leonardo Toffolin (Universita e INFN Trieste (IT)) -
18:20
First results from T2K's upgraded near detector 5m
T2K is a long-baseline experiment measuring neutrino and antineutrino oscillations by observing the disappearance of muon neutrinos, as well as the appearance of electron neutrinos, over a long 295km distance. The ND280 near detector at J-PARC plays a crucial role to minimise the systematic uncertainties related to the neutrino flux and neutrino-nucleus cross-sections as it measures the neutrino beam at a ND site before it oscillates. The ND280 detector has recently been upgraded with a new suite of sub-detectors: a high granularity SuperFGD with 2 million optically-isolated scintillating cubes read out by wavelength shifting fibres and 55000 Multi-Pixel Photon Counters; two horizontal Time-Projection Chambers instrumented with resistive Micromegas, and additionally six panels of scintillating bars for precise time-of-flight measurements. These new detectors permit analyses with lower tracking thresholds, 4pi angular acceptance and the measurement of kinematics of neutrons produced in neutrino interactions. In this talk, new data using the upgraded ND280 detector configuration will be discussed, highlighting significant performance improvements.
Speaker: Carrie Davis -
18:20
The future of xenon-based searches for neutrinoless double beta decay 5m
The search for neutrinoless double beta decay presents one of the most compelling experimental pathways for the discovery of lepton number violation and, more broadly, new physics beyond the Standard Model. Xe-136, with its relatively high isotopic abundance, ease of enrichment, and favorable Q-value, is one of the strongest candidates for the discovery of neutrinoless double beta decay, particularly as the required size of detectors grows. Xe-136 is compatible with multiple detection technologies, including single and dual-phase liquid xenon time projection chambers, gaseous detectors, and large liquid scintillator detectors. With the future of the international double beta decay program uncertain, there is an opportunity for the xenon-based detector community to come together and plan the next generation search for neutrinoless double beta decay of Xe-136.
Speaker: Michelle Jean Dolinski (Drexel University (US)) -
18:25
Illuminating 2-3 sector of neutrino oscillation with unparalleled precision by leveraging the synergistic potential of DUNE and T2HK 5m
A meticulous and high-fidelity determination of the atmospheric oscillation parameters, $\Delta m^2_{31}$ and $\theta_{23}$, emerges as an indispensable prerequisite for an accurate characterization of terrestrial matter effect in long-baseline neutrino experiments that is intrinsically entwined with the resolution of the neutrino mass ordering conundrum and a robust determination of the leptonic CP-violating phase within the canonical three-flavour neutrino oscillation framework. Through a comprehensive assessment of the empirical legacy of past and ongoing experiments, and a forward-looking appraisal of the prospective sensitivities anticipated from the imminent IceCube Upgrade and KM3NeT/ORCA, we embark on an extensive exploration of the potential gains in the precision for the 2–3 oscillation sector that the forthcoming flagship long-baseline ventures—DUNE and T2HK—are poised to deliver, both in isolation and through their synergistic interplay. We accentuate the profound complementarity between these two experiments, demonstrating how their confluence substantially augments the sensitivity to deviations from maximal mixing, facilitates the resolution of the octant degeneracy associated with $\theta_{23}$, and enhances the overall precision in constraining atmospheric parameters far beyond the scope of their individual capabilities. Assuming current global best-fit values and a normal mass ordering, our findings reveal that the combined configuration of DUNE and T2HK can decisively establish the non-maximal character of $\theta_{23}$ and exclude the incorrect octant with a statistical significance approaching 7$\sigma$, even with their nominal exposures. Furthermore, we discern that this tandem setup can surpass the prevailing 1$\sigma$ relative precision on $\sin^2\theta_{23}$ and $\Delta m^2_{31}$ by remarkable factors of 7 and 5, respectively, under the same mass ordering assumption. In light of the protracted decade-long duration required for DUNE and T2HK individually to reach their full exposure along with the associated financial constraints such endeavors entail, we observe that these heightened sensitivities can be attained with substantially reduced exposures — less than half of the nominal — by harnessing the intrinsic synergy between DUNE and T2HK, a synergy that further manifests in the form of markedly tighter constraints in the ($\sin^2\theta_{23}$, $\delta_{\mathrm{CP}}$) parameter space, effectively breaking the degeneracies between them and thus surpassing the individual reach of either experiment in isolation.
Speaker: Ritam Kundu (Institute of Physics, Bhubaneswar) -
18:25
Search for light neutral bosons pair-produced in the Higgs boson decays in the four-electron final state in proton-proton collisions at sqrt(s) = 13 TeV 5m
A search for pairs of light neutral bosons (a) resulting from the decay of a Higgs boson is performed. The a bosons have a mass in the range of 10 to 100 MeV and decay into an electron-positron pair. The search is conducted using proton-proton collision data at sqrt(s) = 13 TeV, corresponding to an integrated luminosity of 138 fb^-1. Due to the low mass of the a bosons, their decay products are highly collimated, and each electron-positron pair must be reconstructed as a single object. A novel multivariate identification technique is developed to identify these distinctive signatures, and events are selected with two such merged electron-positron pairs. No significant excess above the standard model prediction is observed. Upper limits on the branching fraction for H -> aa -> 4e are set at the 95% confidence level, reaching sensitivities as low as O(10^-5). The measured limits are further interpreted in an effective axion-like particle and Higgs-coupling model, confirming the LHC's potential as a unique axion-like particle search facility.
Speaker: Yipin Wang (Peking University (CN)) -
18:30
Enhancing the ATLAS Level-1 endcap muon trigger with New Small Wheel integration in Run3 5m
The Level-1 muon endcap trigger in the ATLAS experiment utilises signals from the Thin Gap Chambers (TGCs) located in the outer muon stations. A significant challenge for this system has been the high background rate caused by particles not originating at the interaction point, which increased the Level-1 trigger rate. To address this issue, the New Small Wheel (NSW) detectors, installed at the inner muon stations during Long Shutdown 2, were integrated into the Level-1 endcap muon trigger system for Run3 operations. In 2024, the full integration of the NSW sectors into the Level-1 trigger decision was successfully completed. By cross-checking the consistency between muon candidates identified by TGC signals and those by the NSW, the system achieved a significant improvement in the discrimination between muons and background particles. This advancement reduced the Level-1 trigger rate by approximately 15 kHz, effectively decreasing the load on the Trigger and DAQ systems and substantially enhancing the data-taking efficiency of the ATLAS experiment.
Speakers: Yuki Sue (KEK High Energy Accelerator Research Organization (JP)), Yuki Sue, Yuki Sue (Nagoya University) -
18:30
Introducing New Decay Modes & Electron Rejection to TauFinder in the MAIA Detector Concept 5m
The 10 TeV MAIA detector concept represents the frontier of future muon colliders. With the potential to perform precision measurements of Standard Model processes and to explore rare phenomena at unprecedented energies, MAIA provides a unique opportunity to high-energy physicists that has previously been unattainable. Our study aims to improve the TauFinder reconstruction algorithm for the MAIA detector concept. Through our work, we seek to improve the identification of genuine
τ leptons, which serve as a gateway to potential signs of new physics.Thus far, we have expanded previous work to include 1-prong + neutral decay modes and have drastically improved their reconstruction efficiencies by loosening τ candidate cuts and introducing a 𝑝𝑇-dependent shrinking cone. Furthermore, we have addressed the 1-prong–electron confusion in the algorithm by implementing a cut on the respective ECAL and HCAL energy ratios, resulting in near-perfect electron rejection with negligible decrease in 1-prong reconstruction efficiencies.
Speaker: Cyrus Kianian (University of Wisconsin Madison (US)) -
18:35
Incorporating Inelasticity Reconstruction into Neutrino Mass Ordering Studies with IceCube 5m
Atmospheric muon neutrinos and antineutrinos passing through the Earth experience matter effect induced oscillations, due to the interior structure of the Earth, which only affect neutrinos or antineutrinos depending on the true neutrino mass ordering (NMO). By leveraging the fact that more neutrinos are expected to be detected than antineutrinos in IceCube DeepCore, the detector can be used to probe the NMO. However, the fact that the mean inelasticity of neutrinos and antineutrinos are different has not yet been exploited to statistically separate neutrinos and antineutrinos for IceCube DeepCore, and could be used for the IceCube Upgrade. To this end, new inelasticity reconstructions were developed using two dimensional convolutional neural networks along with a model aggregating boosted decision tree to combine the outputs of three different neural networks. This presentation will discuss how these reconstruction algorithms were developed and their performance. We then use this new inelasticity reconstruction as a fourth binning variable and calculate new sensitivities to determine how much of an impact this new reconstruction could have on the determination of the NMO with IceCube.
Speaker: Josh Peterson -
18:35
Towards rapid and efficient analyses at scale 5m
As we pursue new physics discoveries at the HL-LHC, one of the important technical challenges will be efficiently extracting physics insights from the massive data volume. To enable rapid execution of this "end-user" step of the workflow, the Coffea framework aims to provide a set of user-friendly columnar tools that facilitate efficient analyses at scale. This poster will describe the benchmarking of a large-scale representative Coffea-based workflow in order to characterize the current capabilities and understand the challenges as we push towards HL-LHC data volumes; this poster will also discuss how the execution of columnar operations can be accelerated with GPUs, studying the performance with a set of benchmark queries and discussing paths towards running a full-scale columnar analysis on GPUs.
Speaker: Kelci Ann Mohrman (University of Florida (US)) -
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Lattice design of a pulsed synchrotron chain for a muon collider sited at Fermilab 5m
We present preliminary lattices for a rapid cycling synchrotron (RCS) chain based on a bottom up design for a 10 TeV parton center-of-momentum (pCM) muon collider sited at Fermilab. The smallest RCS rings in this lattice are 6.28 km in circumference and the largest RCS ring fitting fully within the Fermilab site is 15.5 km. To reach 5 TeV per beam, a single tunnel containing up to two rings is allowed to exceed the 15.5 km limit. Each ring is either a conventional RCS or a hybrid RCS. A conventional RCS relies on only iron dominated, ramped field magnets while a hybrid RCS relies on a combination of interleaved ramped field and superconducting fixed field magnets to achieve higher average magnetic fields while maintaining the high ramp rates achievable with iron dominated magnets. A pair of 6.28 km RCS rings and a 15.5 km RCS ring accelerate beams from 63 GeV to 1.54 TeV. Three scenarios for acceleration from 1.54 TeV to 5 TeV using an off-site tunnel are presented.
Speaker: Kyle Capobianco-Hogan -
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Prospects for Emerging Jets in Run 3 5m
Previous CMS searches for emerging jets (EMJs) have focused on confined dark sector models with a bi-fundamental scalar mediator and dark pion decays primarily within the tracker volume. Additional constraints on dark pion lifetime and mass, as well as mediator mass, have been set by a search for long-lived particle (LLP) showers in the muon system. However, EMJs produced by decays within the calorimeter remain relatively unexplored, marking a gap that can be effectively addressed in Run 3. This presentation will discuss ongoing studies of anomaly detection and LLP triggers to assess their potential for enhancing our sensitivity to EMJs beyond the tracker, as well as the prospects of exploring models with a neutral vector boson mediator.
Speaker: Roy Cruz Candelaria (University of Puerto Rico - Mayagüez) -
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Detector Calibration for the Short-Baseline Near Detector 5m
The Short-Baseline Near Detector (SBND) is a 112-ton liquid argon time projection chamber (LArTPC) serving as the near detector of the Short-Baseline Neutrino Program at Fermilab. SBND aims to make precise measurements of neutrino-argon interactions, necessitating an extensive calibration program for the LArTPC to ensure precision/accuracy in these measurements. This talk describes the use of cosmogenic, radiogenic, and neutrino interaction activity with both Monte Carlo simulation and data in calibrating the SBND subsystems of the Time Projection Chamber, Photon Detection System, and Cosmic Ray Tagger. We will highlight some of SBND's first calibration results, including electronics calibrations, measurement of the electron lifetime, shower calibration, and studies of space charge effects in the detector.
Speaker: Sungbin Oh (Fermilab (US)) -
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Improving track reconstruction in IceCube with neural-network based photon transport PDFs 5m
The IceCube Neutrino Observatory is a neutrino detector located at the South Pole consisting of a three-dimensional array of optical sensors embedded deep within the Antarctic ice. The trajectory of the original neutrino can be inferred by analyzing the spatial and temporal distribution of the Cherenkov radiation produced by the charged particles that are generated when neutrinos interact in the ice. To reconstruct the neutrino's direction, current methods rely on the photon arrival time probability density functions (PDFs), which describe the expected time distribution of photons at each sensor for a given hypothetical muon track. Here, we present progress towards a machine-learning approach, specifically a mixture density network, to extract new state-of-the-art photon arrival time distributions with an improved ice model. Building on the improved correctness of the PDFs and including information about the muon energy loss pattern, we devise methods to mitigate the impact of stochastic energy losses on the angular reconstruction. Our techniques leverage the novel JAX library, a GPU accelerator-oriented array computation designed for machine learning, to significantly reduce the runtime of the reconstruction algorithm.
Speaker: Brandon Henke -
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Automatizing the search for mass resonances using BumpNet 5m
This is a poster to compliment the talk linked here. Below is a re-posted abstract.
The search for resonant mass bumps in invariant-mass histograms is a fundamental approach for uncovering Beyond the Standard Model (BSM) physics at the LHC. Traditional, model-dependent analyses that utilize this technique, such as those conducted using data from the ATLAS detector, often require substantial resources, which prevent many final states from being explored. Modern machine learning techniques, such as normalizing flows and autoencoders, have facilitated such analyses by providing various model-agnostic approaches; however many methods still depend on background and signal assumptions, thus decreasing their generalizability.
We present BumpNet, a convolutional neural network (CNN) that predicts log-likelihood significance values in each bin of smoothly falling invariant-mass histograms, enhancing the search for resonant mass bumps. This technique enables a model-independent search of many final states without the need for traditional background estimation, making BumpNet a powerful tool for exploring the many unsearched areas of the phase space while saving analysis time. Trained on a dataset consisting of realistic smoothly-falling data and analytical functions, the network has produced encouraging results, such as predicting the correct significance of the Higgs boson discovery, agreement with a previous ATLAS dilepton resonance search, and success in realistic Beyond the SM (BSM) scenarios. We are now training and optimizing BumpNet using ATLAS Run 2 Monte Carlo data, with the ultimate goal of performing general searches on real ATLAS data. These encouraging results highlight the potential for BumpNet to accelerate the discovery of new physics.
Related work at https://link.springer.com/article/10.1007/JHEP02(2025)122.
Speaker: Ethan James Meszaros (Université de Montréal (CA)) -
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EveNet: Towards a Generalist Event Transformer for Unified Understanding and Generation of Collider Data 5m
With the increasing size of the machine learning (ML) model and vast datasets, the foundation model has transformed how we apply ML to solve real-world problems. Multimodal language models like chatGPT and Llama have expanded their capability to specialized tasks with common pre-train. Similarly, in high-energy physics (HEP), common tasks in the analysis face recurring challenges that demand scalable, data-driven solutions. In this talk, we present a foundation model for high-energy physics. Our model leverages extensive simulated datasets in pre-training to address common tasks across analyses, offering a unified starting point for specialized applications. We demonstrate the benefit of using such a pre-train model in improving search sensitivity, anomaly detection, event reconstruction, feature generation, and beyond. By harnessing the power of pre-trained models, we could push the boundaries of discovery with greater efficiency and insight.
Speaker: Qibin Liu (SLAC National Accelerator Laboratory (US)) -
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The Phase-1 Upgrade of the ATLAS level-1 calorimeter trigger 5m
The ATLAS level-1 calorimeter trigger is a custom-built hardware system
that identifies events containing calorimeter-based physics objects, including electrons, photons, taus, jets, and missing transverse energy.
In Run 3, L1Calo has been upgraded to process higher granularity input data. The new trigger comprises several FPGA-based feature extractor modules, which process the new digital information from the calorimeters and execute more sophisticated trigger algorithms. The design of the system will be presented along with an analysis of the improved performance of the upgrade in the increasingly challenging Run-3 LHC pile-up environment.Speaker: Anthony Maurel Carroll (University of Oregon (US)) -
18:55
A method for converting high energy physics detector description into a Unity visualization 5m
Detector visualization plays a vital role throughout the lifecycle of high-energy physics (HEP) experiments, yet existing detector descriptions, such as GDML, lack compatibility with industrial 3D tools. We present an automated conversion framework that transforms four major HEP detector types, including GDML, Geant4, ROOT and DD4hep, into standardized FBX models compatible with a industrial 3D platform called Unity. This solution enables high-energy physics detectors to be directly visualized in the professional 3D ecosystem, which is of great help for detector design verification, event display development, and public participation.
Speaker: Tianzi Song (Sun Yat-Sen University (CN)) -
18:55
Directional Reconstruction of UHE Neutrinos in ARA: Polarization Reconstruction Accounting for Biaxial Birefringence and Antenna Response 5m
The Askaryan Radio Array (ARA) is an ultra-high energy (UHE, >10 PeV) neutrino detector at the South Pole, designed to observe radio Askaryan emission from neutrino interactions in ice. A key challenge in reconstructing neutrino arrival directions in ARA is accurately determining the polarization of detected signals, as polarization provides crucial information about the emission geometry of the Cherenkov cone. However, Antarctic ice may exhibit biaxial birefringence, which can cause signal polarizations to rotate and split into two propagation modes traveling at different speeds. Accounting for these effects is important for accurate directional reconstruction in neutrino searches. Additionally, the cross-polarization response of ARA antennas can affect measured polarization angles, further impacting reconstruction accuracy. Using controlled pulser measurements and data from five ARA stations, we investigate the combined effects of birefringence and antenna response on polarization reconstruction. By incorporating birefringence modeling and cross-polarization corrections, we refine our neutrino arrival directional reconstruction techniques, improving their accuracy. In this talk, we present our latest results on polarization reconstruction in ARA, highlighting how these effects impact event directional reconstruction and the identification of potential neutrino sources.
Speaker: Alan Salcedo -
18:55
Reconstruction of Neutrino Events at SBN with SPINE Machine Learning 5m
The Short-Baseline Neutrino (SBN) Program at Fermilab consists of two liquid argon time projection chamber (LArTPC) detectors: the Short-Baseline Near Detector (SBND) located 110 meters downstream from the Booster Neutrino Beam (BNB) target, and the ICARUS detector positioned 600 meters downstream from the BNB target. The program is designed to probe short-baseline neutrino anomalies, including the LSND electron neutrino excess and the MiniBooNE low-energy excess. Additionally, the ICARUS detector, which also lies off-axis to the NuMI beamline, provides unique sensitivity to physics beyond the Standard Model (BSM) and novel cross section measurements not accessible through the BNB alone. To analyze the data from these detectors, we have begun employing a machine-learning-based reconstruction algorithm referred to as “Scalable Particle Imaging with Neural Embeddings” (SPINE). SPINE has shown improvement in neutrino identification and particle species discrimination for both track-like and shower-like topologies in ICARUS, with the potential to enhance the quality of measurements achievable within the SBN Program. In this talk, I will present an overview of analysis efforts at SBN that utilize SPINE, highlighting its impact on particle selection and reconstruction performance.
Speaker: Daniel Carber
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Plenary: Friday Plenary 1 Lecture Hall
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Convener: Raymond Brock (Michigan State University)-
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CEPC status and plans 30mSpeaker: Xinchou Lou (Chinese Academy of Sciences (CN))
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European future collider plans 30mSpeaker: Karl Jakobs (University of Freiburg (DE))
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Physics at Future Colliders [Zoom] 30mSpeakers: Hitoshi Murayama (University of Tsukuba), Hitoshi Murayama (University of California Berkeley (US)), Hitoshi Murayama
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Morning Break 30m
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Plenary: Friday Plenary 2 Lecture Hall
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Search for new resonances at the LHC 30m
Common ATLAS and CMS presentation
Speaker: Flavia de Almeida Dias (Nikhef National institute for subatomic physics (NL)) -
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Unusual signatures at ATLAS, CMS, and LHCb 30mSpeaker: Federico Leo Redi (Università degli Studi e INFN Milano (IT))
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Rare kaon decays 30mSpeakers: Cristina Lazzeroni (University of Birmingham (GB)), Cristina Lazzeroni (University of Birmingham (GB)), Cristina Lazzeroni (University of Birmingham (GB))
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Special Events: Informal comments from attendees Grand Terrace (Monona)
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Plenary: Friday Plenary 3 Lecture Hall
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Opportunities and Phenomenology of Astrophysical Neutrinos 30mSpeakers: Carlos A. Argüelles-Delgado (Harvard University), Prof. Carlos Arguelles Delgado (Harvard University)
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Neutrino anomalies and measurements 30mSpeakers: Sophie Berkman (University of British Columbia), Sophie Berkman
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Long baseline neutrino oscillations 30mSpeakers: Mark Patrick Hartz (TRIUMF (CA)), Dr Mark Patrick Hartz (TRIUMF & Kavli IPMU, University of Tokyo)
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Afternoon Break 30m
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Plenary: Friday FinaleConvener: Vernon Barger (University of Wisconsin - Madison)
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Overview of Neutrino Mass Determination 30mSpeakers: Diana Parno (Carnegie Mellon University), Diana Parno (Carnegie Mellon University), Diana Parno (Carnegie Mellon University)
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Hadron spectroscopy 30mSpeaker: Mark Richard James Williams (The University of Edinburgh (GB))
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Review of Hadronic Vacuum Polarization calculations via $e^+e^-$ measurements 30m
The discrepancy on the muon anomalous magnetic moment values obtained via a direct measurement and via a data-driven theory determination that uses the experimentally measured $e^+e^-$ hadronic cross section, is among the long standing and most significant deviations from the Standard Model predictions. The recently presented final result of the direct measurement performed at the $g-2$ experiment at Fermilab, with an impressive accuracy of 127 parts-per-billion, further stresses the need for a theory estimate of comparable accuracy.
The $e^+e^-$ hadronic cross section is the experimental input to the dispersive integral for the calculation of the hadronic contribution to the $g-2$, which is largely dominated by the $e^+e^- \to \pi^+\pi^-$ channel. Precise measurements of the $e^+e^- \to \pi^+\pi^-$ cross section with a sub-percent accuracy, in the energy region of the $\rho$-resonance peak, have been performed by several experiments, but the results differ way more than the published accuracies limiting the comparison with the Fermilab direct measurement.
New results are expected to become available in the near future from KLOE, CMD-3, SND and BESIII experiments, while a new measurement from the $BABAR$ collaboration is presented today and its impact on the present situation is discussed. This measurement makes use of the entire $BABAR$ data set and adopts a different analysis strategy, with results completely independent of the results published in the 2009 $BABAR$ publication.Speaker: Zhiqing Philippe Zhang (IJCLab, Orsay (FR)) -
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Final Results from the Muon g-2 Experiment 30m
The Muon g-2 Collaboration recently released a final measurement of the magnetic anomaly of the positive muon (a_μ), based on data taken from 2020 to 2023 at Fermilab. This new dataset contains over 2.5 times the total statistics of the previous publications. The measurement agrees well with the results from 2023 and 2021, with significantly reduced uncertainty largely owing to the increase in statistical precision. The combined Fermilab result is aμ=1165920705(148)×10^{−12} – a precision of 127 ppb. This talk will cover the highlights of the latest measurement and discuss its comparison with the latest Standard Model prediction.
Speaker: James Mott (Fermi National Accelerator Laboratory)
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Community Events: Dane Dances - Rooftop Dance Party Rooftop
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