Lepton-Photon 2025

25 Aug 2025, 08:00 → 29 Aug 2025, 21:00 US/Central

Monona Convention Center (Madison, WI)

Sridhara Dasu (University of Wisconsin Madison (US))

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

Abstracts for Talks is now closed.

To Submit an Abstract for a Poster, please access: Posters

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.

Monday 25 August

09:00 → 10:30 Plenary: Opening Session

09:00 Welcome to Madison

09:10 Sponsor Welcome & IUPAP Report

Speaker: Marcelo Gameiro Munhoz (Universidade de Sao Paulo (USP) (BR))

09:30 LHC Status and HL-LHC Readiness

Speaker: Markus Zerlauth (CERN)

10:00 Physics at Future Colliders

Speakers: Hitoshi Murayama (University of Tsukuba), Hitoshi Murayama (University of California Berkeley (US)), Hitoshi Murayama

10:30 → 11:00 Morning Break

11:00 → 12:40 Parallel: Accelerator Technologies 1

11:00 A path towards at 10 TeV Muon Collider

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: Diktys Stratakis

11:20 The 10 TeV Wakefield Collider Design Study

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: Spencer Gessner

11:40 The Cool Copper Collider: An Advanced Concept for a Future e+e- Higgs Factory

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

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

Precise luminosity measurement at CMS

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

11:00 → 12:40 Parallel: Charged Lepton Flavor Violation 1

11:00 The Mu2e experiment: Overview and current status

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

LFV decays of bosons at CMS

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

11:40 Charged lepton flavor violation searches at BESIII

The charged Lepton Flavor Violation (cLFV) process is forbidden in the Standard
Model (SM). Even considering the finite but tiny neutrino masses, the cLFV process
is highly suppressed. In this talk, we present the cLFV searches at the BESIII
experiment. The cLFV processes $J/\psi \to e \mu$ and $J/\psi \to e \tau$ have been
searched for with 10 billion $J/\psi$ events collected by BESIII, setting an upper
limits at the level of $10^{-9} - 10^{-8}$, which improve the previously published limits
by two orders of magnitude. In addition, a recent result of search for $\psi(3686) \to e \tau$ will also be presented. These results will be the most stringent upper limits on heavy quarkonium cLFV decays.

Speaker: Fabrizio Bianchi

12:00 Search for the Lepton Flavour Violating decays $\Upsilon(2{\mathrm{S}}) \to e^{\pm}\mu^{\mp}$ and $\Upsilon(3{\mathrm{S}}) \to e^{\pm}\mu^{\mp}$

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 $e^+e^-$ collider

Speaker: Fabio Anulli (Sapienza Universita e INFN, Roma I (IT))

12:20 Probing Lepton Flavor Violation at Future Electron-Positron Colliders

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)

11:00 → 12:40 Parallel: Dark Sectors (Direct/Indirect) 1

11:00 Probing benchmark models of hidden-sector dark matter with DAMIC-M

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

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

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 effectives 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 Long lived particle searches with FASER

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))

12:20 Searches for physics beyond the Standard Model with the Short-Baseline Near Detector

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: José I. Crespo-Anadón (CIEMAT (Spain))

11:00 → 12:40 Parallel: Heavy BSM Searches at Colliders 1

11:00 Search for new heavy resonances decaying to higgs boson pairs in boosted bbtautau final states

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: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

11:20 Recent results on Vector Like Quarks/Excited Fermions at CMS

Recent results on Vector Like Quarks/Excited Fermions at CMS

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

11:40 Searches for VLQs and LQs from the ATLAS Experiment

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

12:00 Probing new physics with dedicated data streams at CMS

Probing new physics with dedicated data streams at CMS

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

12:20 Measurement of the high-mass $\tau \bar{\tau}$ production cross-section and constraints on leptoquarks, Z’ bosons and effective couplings.

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

11:00 → 12:40 Parallel: Neutrino Physics 1

11:20 Correlating Neutrino magnetic moment and inert doublet dark matter in a radiative seesaw scenario

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

11:40 Beyond Standard Model Neutrino Oscillation Results from NOvA Experiment

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

12:00 First Measurement of Neutrino Interaction Cross Sections with FASER

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 Searches for physics beyond the Standard Model with the MicroBooNE experiment

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: MicroBooNE Collaboration

11:00 → 12:40 Parallel: Theory 1

11:00 Thermal corrections to dark matter annihilation cross sections

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

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

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

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 GSO Defects, IIA/IIB Walls, and a Surprisingly Stable R7-Brane

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)

11:00 → 12:40 Parallel: Top Physics 1

11:00 ATLAS results on top quark properties

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

11:20 Measurements of the top quark properties and its production at its kinematic threshold

Measurements of the top quark properties and its production at its kinematic threshold

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

11:40 ATLAS results on ttbar+heavy flavour measurements

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

12:00 Top quark production at the ttbar threshold

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: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

12:20 Toponium at the LHC

We study the signature of toponium at the LHC.

Speaker: Ya-Juan Zheng

12:40 → 14:00 Special Events: Top Personal Stories

14:00 → 15:30 Parallel: Accelerator Technologies 2

14:00 The US Magnet Development Program (MDP) Roadmap for future particle physics colliders.

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

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 Schrotron Acceleration Chain for a Fermilab Sited Muon Collider

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

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)

14:00 → 15:30 Parallel: Dark Sectors (Direct/Indirect)

14:00 Status of LUX-ZEPLIN (LZ) Experiment

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

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.

14:40 First Physics Results from milliQan

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

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))

14:00 → 15:30 Parallel: Hadron Physics 1

14:00 $D-\bar{D}$ mixing theory: new results

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

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 $\text{SU}(3)_{\text{F}} \otimes \text{SU}(2)_{\text{spin}}$

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 Precision measurement of the branching fraction for the decay $\psi(2S)\rightarrow\tau^{+}\tau^{-}$

Using $(2259.3 \pm 11.1)\times10^{6}$ $\psi(2S)$ events acquired with the BESIII
detector, the branching fraction of $\psi(2S)\rightarrow\tau^{+}\tau^{-}$ is measured with improved precision to be $\mathcal{B}_{\psi(2S)\rightarrow\tau^{+}\tau^{-}}=(3.240~\pm~0.023~\pm~0.081)\times 10^{-3}$, where the first and second uncertainties are statistical and systematic, respectively, which is consistent with the world average value within one standard deviation. This value, along with those for the branching fractions of the $\psi(2S)$ decaying into $e^{+}e^{-}$ and $\mu^{+}\mu^{-}$, is in good agreement with the relation predicted by the sequential lepton hypothesis. Combining the branching fraction values with the leptonic width of the $\psi(2S)$, the total width of the $\psi(2S)$ is determined to be (287 $\pm$ 9) keV.

Speaker: Fabrizio Bianchi

14:00 → 15:30 Parallel: Heavy BSM Searches at Colliders 2

14:00 Self Consistent Thermal Resummation: A Case Study of the Phase Transition in 2HDM

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)

14:20 Search for rare decay of SM Higgs to light scalars in the CMS experiment

Search for rare decay of SM Higgs to light scalars in the CMS experiment

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:40 Searches for Beyond Standard Model Higgs boson decays (including low mass resonances)

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

15:00 Searches for additional Higgs bosons (high & low mass) at CMS

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.
Files

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:00 → 15:30 Parallel: Neutrino Physics 2

14:00 Understanding Cross Section Model Uncertainties in Neutrino Experiments

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)

14:20 Neutrino-nucleus interactions and the quest for new and precision physics searches in neutrino experiments

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

14:40 Neutrino cross-section results from T2K

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: Dr Anna Holin

15:00 Neutrino Interaction Measurements with the SBND Experiment

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: Afroditi Papadopoulou

14:00 → 15:30 Parallel: Top Physics 2

14:00 Quantum Entanglement and Bell Inequality Violation in Semi-Leptonic Top Decays

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

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

14:40 Cross section measurements of top quark production

Cross section measurements of top quark production

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

15:00 ATLAS results on top quark mass

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

15:30 → 16:00 Afternoon Break

16:00 → 17:30 Plenary: Monday Afternoon Plenary

16:00 Search for new resonances at the LHC

Common ATLAS and CMS presentation

16:30 Non-resonant searches at the TeV scale

Common ATLAS and CMS presentation

17:00 Top measurements and rare ttX processes

Common ATLAS and CMS presentation

17:30 → 19:00 Reception: RoofTOP - Celebrating Anniversaries Top (30y) and nuTau (25y)

Tuesday 26 August

09:00 → 10:30 Plenary: Tuesday

09:00 Higgs couplings and properties

Common ATLAS and CMS presentation

09:30 Di-Higgs Searches

Common ATLAS and CMS presentation

Speakers: SHIN-SHAN YU (FERMILAB), Shin-Shan Yu (Catholic University of America (US))

10:00 Higgs Physics Prospects

Speaker: Michael Peskin

10:30 → 11:00 Morning Break

11:00 → 12:40 Parallel: Charged Lepton Flavor Violation 2

11:00 Latest results of $\mu \to e \gamma$ search with the MEG II experiment

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

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

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

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)

12:20 Heavy and light new physics in rare muon decays

I will discuss signatures of muon-to-electron conversion arising from both heavy and light new physics at high-intensity rare muon decay experiments. For heavy new physics, I will outline a hierarchy of effective field theories for computing the rate of $\mu \to e$ conversion in the field of a nucleus, highlighting how different new physics scenarios imprint on nuclear responses relevant for experiments such as Mu2e and COMET. For light new physics, I will focus on the discovery potential and experimental reach of the $\mu \to 5e$ channel at Mu3e.

Speaker: Tony Menzo

11:00 → 12:40 Parallel: Dark Sectors at Colliders 1

11:00 Searches for dark sector particles at Belle and Belle II

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: Steven Robertson (IPP / University of Alberta)

11:20 Shedding Light on Dark Matter via the Higgs Portal

Shedding Light on Dark Matter via the Higgs Portal

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

11:40 Searches for unusual signatures from dark sectors from the ATLAS Experiment

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

12:00 Search for dark sector at BESIII

The BESIII experiment is taking data at symmetric e+e- collider operating at the center of mass
energies from 2.0 to 4.95 GeV. With the world’s largest on-threshold production data
set of $J/\psi$ (10 billion), $\psi(3686)$ (2.6 billion), and 20 $fb^{-1}$ of $\psi(3770)$ decaying
into D meson pairs, we are able to search for various dark sectors candidates produced in e+e-
annihilation and meson decay processes. In this talk, we report the search for BSM
particles in $\Sigma$ decay and Axion-like particle search with $J/\psi$ data. The search
for massless dark photon through the charm FCNC process $D^0 \to \omega \gamma’$ and
$D^0 \to \gamma \gamma’$, and $K_s^0$ invisible decay will also be presented.

Speaker: Fabrizio Bianchi

12:20 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

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

11:00 → 12:40 Parallel: EWK Physics 1

11:00 Measurement of rare electroweak processes including vector boson scattering and triboson in ATLAS

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

11:20 Vector Boson Scattering measurements at CMS

Vector Boson Scattering measurements at CMS

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

11:40 Measurement of diboson production and precision EFT constraints in ATLAS

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

12:00 Measurements of Triboson production at CMS

Measurements of Triboson production at CMS

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

12:20 Testing the lepton content of the proton at HERA and EIC

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)

11:00 → 12:40 Parallel: Future Colliders 1

11:00 A Linear Collider Vision for the Future of Particle Physics

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: Ivanka Bozovic-Jelisavcic (University of Belgrade (RS))

11:20 Progress of the Super Tau Charm Facility in China

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 Gaseous detector R&D for FCC-ee

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. When combined with a high-resolution pixel detector and a silicon strip wrapper, a gaseous detector enables exceptional tracking performance, achieving a transverse momentum resolution of 0.1–0.2% at 45 GeV. This represents a 5- to 10-fold improvement over the current capabilities of the ATLAS and CMS detectors at the same energy scale. Furthermore, the system resolves track angles with O(1 mrad) precision and provides O(100) hits along the track path, ensuring robust reconstruction of particle trajectories. In addition, the gaseous detector offers excellent particle identification capabilities by measuring energy deposition or the number of primary ionization clusters produced. This allows for excellent separation of charged pions and kaons across a broad momentum range from O(100 MeV) to O(40 GeV).

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 straw tracker for the inner tracking system and a muon detector combining drift tubes and scintillator strips. Results from detailed simulations will be presented. In addition, experimental data from prototype detectors will be discussed, providing insights into their practical implementation and validating the simulation predictions. These advancements underscore the potential of gaseous detectors to significantly enhance the physics reach of the FCC-ee.

Speaker: Junjie Zhu (University of Michigan (US))

12:00 R&D Studies on the ALLEGRO Noble Liquid Calorimeter for FCC-ee

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.

Speaker: Jana Faltova (Charles University (CZ))

12:20 A Straw Tracker for FCC-ee Experiments

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

11:00 → 12:40 Parallel: Instrumentation 1

11:00 Development of the New Optical Sensor for IceCube-Gen2

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

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: ATLAS Speaker

11:40 Status and performance of the CMS Electromagnetic Calorimeter in Run 3 of LHC

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.

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

12:00 The CMS ECAL upgrade for the High-Luminosity LHC

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: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

12:20 The High-Granularity Timing Detector for the ATLAS experiment at the HL-LHC

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: ATLAS Speaker

11:00 → 12:40 Parallel: Quark Flavor 1

11:00 Baryonic CP violation at LHCb

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 (charmless) 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

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.

Speaker: Steven Robertson (IPP / University of Alberta)

11:40 Measurements of electroweak penguin and lepton-flavour violating $B$ decays to final states with missing energy at Belle and Belle II

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: Steven Robertson (IPP / University of Alberta)

12:00 Quantum-correlation of neutral charmed mesons at BESIII

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.

Speaker: Fabrizio Bianchi

12:20 Measurements of the CKM angle $\gamma$ at LHCb

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))

11:00 → 12:40 Parallel: Theory 2

11:00 BSM theory review

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

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

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 Cheshire θ terms, Aharonov-Bohm effects, and axions

We discuss unusual θ terms that can appear in field theories that allow global vortices. These "Cheshire θ terms" induce Aharonov-Bohm effects for some particles that move around vortices. For example, a Cheshire θ term can appear in QCD coupled to an axion and induces Aharonov-Bohm effects for baryons and leptons moving around axion strings. We point out a potential experimental signature left on the spectrum of gravitational waves from axion cosmic string network by the Cheshire θ term.

Speaker: Gongjun Choi

12:20 Charged Lepton Flavor Violation in a Lepton Flavor Portal Matter Model

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)

12:40 → 14:00 Special Events: Outreach Ideas Brainstorming

14:00 → 15:30 Parallel: Neutrino Physics 2

14:00 Neutrino-argon cross-section measurements from the MicroBooNE experiment

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.

14:20 Status and Plans for Measurements of 𝞶-Ar Interactions at ICARUS

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

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

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

14:00 → 15:30 Parallel: Searches with Jets

14:00 Multi-jet probes of new particles at the LHC: theory input

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

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: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:50 Searches for dijet resonances with the ATLAS detector

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

15:10 Searches for new particles using jets, photons or missing energy using the ATLAS detector

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

14:00 → 15:30 Parallel: Exotic Searches 1

14:00 Stealth and RPV SUSY searches with CMS

Stealth and RPV SUSY searches with CMS

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:20 Recent searches for SUSY particles with CMS with MET

Recent searches for SUSY particles with CMS with MET

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:40 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

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

15:00 Physics results with the CMS Precision Proton Spectrometer and projections for the HL-LHC with PPS2

Physics results with the CMS Precision Proton Spectrometer and projections for the HL-LHC with PPS2

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:00 → 15:30 Parallel: Hadron Physics 1

14:00 Exotic hadron studies in ATLAS

Recent searches for exotic resonances performed in the ATLAS experiment will be presented. This will include studies of $Z_c$ and $Z_{cs}$ states in $B$ meson decays and searches for exotic resonances in di-charmonium final states.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

14:20 Charmonium(-like) states at BESIII

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.

Speaker: Fabrizio Bianchi

14:40 Hadron spectroscopy at Belle and Belle II

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.

Speaker: Steven Robertson (IPP / University of Alberta)

15:00 Charmed baryon decays at BESIII

BESIII has accumulated 4.5 $fb^-1$ of e+e- collision data in the 4.6 to 4.7 GeV energy range, which provide the largest dataset of $\Lambda_c - \bar{\Lambda_c}$ pairs in the world. Our presentation will include the observation of a rare beta decay of the charmed baryon $\Lambda_c^+ \to n e^+ \nu$ with a Graph Neural Network approach and the first measurement of the decay asymmetry in the pure W-boson-exchange decay $\Lambda_c^+ \to Ξ^0 K^+$, as well as the branching fraction measurements of the inclusive decays $\Lambda_c^+ \to X e^+ \nu$ and $\bar{\Lambda_c} \to \bar{n} X$. Furthermore, we will present the results of the partial wave analysis of $\Lambda_c^+ \to \Lambda \pi^+ \pi^0$, and $\Lambda_c^+ \to \Lambda \pi^+ \eta$. Our presentation will also include branching fraction measurements of Cabibbo-suppressed decays, including $\Lambda_c^+ \to p \pi^0$, and the measurements of $K_S-K_L$ asymmetries in the $\Lambda_c^+$ decays.

Speaker: Fabrizio Bianchi

14:00 → 15:30 Parallel: Higgs 1

14:00 Non-resonant HH and higgs-self couplings measurements by ATLAS

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

14:20 Di-Higgs searches at CMS

Di-Higgs searches at CMS

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:40 Recent results on measurements of the Higgs boson in ATLAS

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

15:00 Higgs physics at a 10 TeV Muon Collider

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.

Speakers: Alessio Gianelle (Universita e INFN, Padova (IT)), Davide Zuliani (Universita e INFN, Padova (IT)), Donatella Lucchesi (Universita e INFN, Padova (IT)), Leonardo Palombini (INFN-Padova, Italy), Lorenzo Sestini (Universita e INFN, Firenze (IT)), Massimo Casarsa (INFN, Trieste (IT)), Paolo Andreetto (Universita e INFN, Padova (IT))

14:00 → 15:30 Parallel: Instrumentation 2

14:00 Operational Experience and Performance with the ATLAS Pixel detector at the Large Hadron Collider at CERN

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: ATLAS Speaker

14:20 Phase-2 Upgrade of the ATLAS Inner Tracker

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: ATLAS Speaker

14:40 The ePIC Silicon Vertex Tracker: Design and Status

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

Precision timing at the HL-LHC with the CMS MIP Timing Detector: current progress on validation and production

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:00 → 15:30 Parallel: Quark Flavor 2

14:00 Recent results on (semi)-leptonic D decays at BESIII

BESIII has collected 20.3 and 7.33 $fb^{-1}$ of e+e- collision data samples at 3.773 and 4.128-4.226 GeV, respectively, presenting a unique opportunity to test the non-perturbative nature of QCD in the charm sector. We will present the first experimental study of $D_{(s)}^{*+} \to l^+ \nu$ and the improved measurements of |Vcd|, |Vcs|, $D_s^+/D^+$ decay constant in $D_s^+/D^+ \to \mu^+ \nu$ and $\tau^+ \nu$.
Furthermore, we will summarize the most precise experimental results for $D_{(s)} \to K$, $D \to \pi$, $D_s \to \eta^{(‘)}$ transition form factors.
We will also discuss recent progresses in amplitude analyses and branching fraction measurements of $D_{(s)}\to h h l^+ \nu$ and $h h h l^+ \nu$ processes. On the hadron spectrum, scalar ($a_0, f_0, \sigma$), vector (K*, $\phi$), axial vector ($K_1, b_1$) particles are studied. The experimental results of $D \to a_0(980)$, $D \to \sigma$, $D \ K^*$, $D_s \to f_0(980)$, and $D_s \to \phi$ form factors will be presented.

Speaker: Fabrizio Bianchi

14:20 Measurement of B meson production fractions in proton-proton collisions at 13 TeV using hadronic open-charm and charmonium decays

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

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: Steven Robertson (IPP / University of Alberta)

15:00 Recent results from LHCb on charged-current decays of b-hadrons

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)

15:30 → 16:00 Afternoon Break

16:00 → 17:30 Plenary: Tuesday

16:00 Particle physics phenomenology

Speakers: Tao Han, Tao Han (University of Wisconsin)

16:30 QCD studies at the LHC

Speaker: Jesse Liu (New York University)

17:00 Electron Ion Collider

Speakers: Abhay Deshpande (Stony Brook University), Abhay Deshpande

17:30 → 19:00 Reception: Poster Session

Wednesday 27 August

09:00 → 10:30 Plenary: Wednesday

09:00 Status of string theory

Speakers: MIRJAM CVETIC, Mirjam Cvetic (University of Pennsylvania (US)), Mirjam Cvetic (University of Pennsylvania)

09:30 Cosmological implications for particle physics

Speakers: Katherine Freese, Katherine Freese

10:00 DESI cosmology results

Speaker: Prof. Johannes Lange (American University)

10:30 → 11:00 Morning Break

11:00 → 12:40 Parallel: Dark Sectors at Colliders 2

11:00 Searching solo for the invisible at CMS

Searching solo for the invisible at CMS

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

11:20 FORMOSA: looking forward to millicharged particles at the LHC

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))

11:40 Search for new physics in final states with semi-visible jets or anomalous signatures using the ATLAS detector

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: ATLAS Speaker

12:00 Search for $B$ Mesogenesis and Dark matter at $BABAR$.

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: Fabio Anulli (Sapienza Universita e INFN, Roma I (IT))

11:00 → 12:40 Parallel: EWK Physics 2

11:00 Polarization in VV production in CMS

Polarization in VV production in CMS

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

11:20 Double parton scattering in same-sign WW production at ATLAS

The first measurement of double parton scattering in same-sign W boson pair production with the ATLAS detector is presented. The data set used corresponds to an integrated luminosity of 140 fb^-1 of proton--proton collisions at a center-of-mass energy of 13 TeV, collected during Run 2 of the Large Hadron Collider. The study is performed in final states including two same-charge leptons, electron or muon, missing transverse momentum, and up to one jet. An excess of events is observed over the expected background contributions with a significance of 8.8 standard deviations. The fiducial cross sections are presented.

Speaker: ATLAS Speaker

11:40 Recent results on EW physics at LHCb

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))

12:00 Electroweak boson properties at CMS

Electroweak boson properties at CMS

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

12:20 Precision measurements of Drell-Yan processes in ATLAS

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

11:00 → 12:40 Parallel: Future Colliders 2

11:00 The IDEA detector concept for FCC-ee

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

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.

Speakers: Alessio Gianelle (Universita e INFN, Padova (IT)), Davide Zuliani (Universita e INFN, Padova (IT)), Donatella Lucchesi (Universita e INFN, Padova (IT)), Leonardo Palombini (INFN-Padova, Italy), Lorenzo Sestini (Universita e INFN, Firenze (IT)), Massimo Casarsa (INFN, Trieste (IT)), Paolo Andreetto (Universita e INFN, Padova (IT))

11:40 CyberPFA: Particle Flow Algorithm for Crystal Bar ECAL

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

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

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)

11:00 → 12:40 Parallel: Heavy Ion Physics

11:00 Top-Quark Pair Production in Heavy-Ion Collisions in the ATLAS Experiment

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

11:20 Overview of recent UPC measurements with the ATLAS Detector

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: ATLAS Speaker

11:40 Top-Quark Pair Production in Heavy-Ion Collisions in the ATLAS Experiment

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: ATLAS Speaker

11:00 → 12:40 Parallel: Quark Flavor 3

11:00 Charm physics at Belle and Belle II

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.

Speaker: Steven Robertson (IPP / University of Alberta)

11:20 The hadronic decays of charmed mesons at BESIII

BESIII has collected 20.3 and 7.33 $fb^{-1}$ of e+e- collision data samples at 3.773 and 4.128-4.226 GeV, which provide the largest dataset of $D\bar{D}$ and $D_sD_s$ pairs in the world. We will present the measurement of branching fractions of fifteen $D_s^+$ hadronic decays using a global fit and highlight our recent advancements in amplitude analyses of $D^+ \to K_s \pi^+ \eta$, $D \to \pi \pi \eta$, $D^+ \to K_sK_s\pi^+$, $D^+ \to K^-\pi^+\pi^+\pi^0$, $D_s^+ \to \pi^+\pi^+\pi^-\pi^0$, and $D_s^+ \to \pi^+\pi^+\pi^-\pi^0\pi^0$. In these amplitude analyses, we observe the $D^+ \to K_s a^0(980)^+$, $D \to a^0(980) \pi$, and $D_s^+ \to \omega \rho^+$ decays, along with deviations in the branching fractions of $\phi$ decays from the PDG average.

Speaker: Fabrizio Bianchi

11:40 Hyperon physics at BESIII

With the large datasets on 𝑒+𝑒−-annihilation at the 𝐽/𝜓 and 𝜓(3686) resonances collected at the BESIII experiment, multi-dimensional analyses making use of polarization and entanglement can shed new light on the production and decay properties hyperon-antihyperon pairs. In a series of recent studies performed at BESIII, significant transverse polarization of the (anti)hyperons has been observed in 𝐽/𝜓 or 𝜓(3686) $\to$ $Λ\bar{Σ}$ , $Σ\bar{Σ}$ , $Ξ\bar{Ξ}$ . The decay parameters for the most common hadronic weak decay modes were measured, and due to the non-zero polarization, the parameters of hyperon and antihyperon decays could be determined independently of each other for the first time. Comparing the hyperon and antihyperon decay parameters yields precise tests of direct, Δ𝑆 = 1 CP-violation that complement studies performed in the kaon sector.

Speaker: Fabrizio Bianchi

12:00 Search for the X17 particle with the PADME experiment

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: PADME Collaboration

12:20 New measurement of $K^{+} \rightarrow \pi^{+}\nu\bar{\nu}$ branching ratio at the NA62 experiment

The $K^{+}\rightarrow\pi^{+}\nu\bar{\nu}$ decay is a golden mode for flavour physics. Its branching ratio is predicted with high precision by the Standard Model to be less than $10^{-10}$, and this decay mode is highly sensitive to indirect effects of new physics up to the highest mass scales. A new measurement of the $K^{+}\rightarrow\pi^{+}\nu\bar{\nu}$ decay by the NA62 experiment at the CERN SPS is presented, using data collected in 2021 and 2022. This new dataset was collected after modifications to the beamline and detectors and at a higher instantaneous beam intensity with respect to the previous 2016-2018 data taking. Using the NA62 datasets from 2016-2022, a new measurement of $\mathcal{B}(K^{+}\rightarrow\pi^{+}\nu\bar{\nu}) = \left(13.0^{+ 3.3}_{- 2.9} \right)\times 10^{-11} $ is reported, and for the first time the $K^{+}\rightarrow\pi^{+}\nu\bar{\nu}$ decay is observed with a significance exceeding $5\sigma$.

Speaker: OTHER SPEAKER

11:00 → 12:40 Parallel: Triggers AI/ML

11:00 Online track reconstruction with graph neural networks on FPGAs for the ATLAS experiment

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: ATLAS Speaker

11:20 Run 3 CMS Trigger Developments for New Physics Exploration

Run 3 CMS Trigger Developments for New Physics Exploration

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

11:40 Strategies and Performances of the CMS Trigger in Run 3

Strategies and Performances of the CMS Trigger in Run 3

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

12:00 GELATO: A Generic Event-Level Anomalous Trigger Option for ATLAS in LHC Run 3

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: ATLAS Speaker

12:20 CICADA: Real-Time Anomaly Detection with Calorimeter Images at the CMS Level-1 Trigger

CICADA: Real-Time Anomaly Detection with Calorimeter Images at the CMS Level-1 Trigger

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

12:40 → 14:00 Special Events: Young-Senior Mingling

14:00 → 15:30 Parallel: QCD with Jets

14:00 Alpha_s measurements with the CMS experiment

Alpha_s measurements with the CMS experiment

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:18 Soft QCD measurements, diffractive and exclusive processes with CMS data

Soft QCD measurements, diffractive and exclusive processes with CMS data

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:36 Study of soft QCD phenomena and double parton interaction in ATLAS

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

14:54 Event shape variables in pp collisions in CMS

Event shape variables in pp collisions in CMS

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

15:12 Measurement of multi-jets and vector boson plus jets production in ATLAS

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.

Speakers: ATLAS Spkear, Evelin Meoni (Universita della Calabria e INFN (IT))

14:00 → 15:30 Parallel: Exotic Searches 2

14:00 Searches for Supersymmetry with compressed scenarios

Searches for Supersymmetry with compressed scenarios

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:20 Searches for strong production of supersymmetric particles with the ATLAS detector

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 and sbottom, in a variety of decay modes. Recent interpretations in the context of the pMSSM are also presented.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

14:40 Searches in CMS for new physics in final states with leptons

Searches in CMS for new physics in final states with leptons

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

15:00 Searches for new physics using leptons with the ATLAS detector

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

14:00 → 15:30 Parallel: Hadron Physics 2

14:00 Spin and symmetry properties of all-charm tetraquarks

Spin and symmetry properties of all-charm tetraquarks

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:20 Light Baryon Spectroscopy at BESIII

Based on the large samples of 10 billion J/ψ and 2.7 billion ψ(3686) events accumulated at the BESIII detector, the recent progresses on baryon spectroscopy, including the amplitude analyses of $ψ(3686)\to p \bar{p} \pi^0$, $ψ(3686) \to p \bar{p} \eta$, and $ψ(3686)\to \Lambda \bar{\Sigma} \pi$, will be presented. The perspectives on the baryon spectroscopy at BESIII will also be discussed.

Speaker: Fabrizio Bianchi

14:40 Spectroscopy of Strange Mesons with COMPASS

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))

15:00 Exotic hadronic states at LHCb

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))

14:00 → 15:30 Parallel: Higgs 2

14:00 Measurements of the Higgs boson properties from diboson final states

Measurements of the Higgs boson properties from diboson final states

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:20 Higgs CP properties and EFT measurements from ATLAS

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

14:40 Measurements of Higgs Bosons Decaying to Bottom and Charm Quarks from Vector Boson Fusion Production with the ATLAS Experiment

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

15:00 Constraints on Higgs light Yukawa couplings

Constraints on Higgs light Yukawa couplings

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:00 → 15:30 Parallel: Instrumentation 3

14:00 Detector challenges at future higgs factories

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

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: ATLAS Speaker

14:40 first test of a wireless power transmission for HEP experiments

The emergence of fully electric vehicles and autonomous systems (e.g., cars, drones), combined with advancements in long-distance power transmission (e.g., satellites), has accelerated the development of wireless power transmission technologies. These technologies aim to address critical challenges such as reducing the reliance on extensive cabling and minimizing noise interference, especially in high-energy physics experiments. In such environments, the large quantity of copper wires not only contributes to increased material costs and complexity but also serves as a potential source of noise and signal degradation. A promising solution lies in the use of laser-based wireless power transmission systems, where optical power converters are positioned close to or directly on front-end boards.
As part of the Wireless Allowing Data and Power Transfer (WADAPT) consortium, we have undertaken a pioneering study to explore the feasibility of using laser-based wireless power systems in experimental setups. The study centers around a 10W laser coupled with a dedicated photovoltaic cell (PVC), designed to convert laser energy into electrical power efficiently. The system was rigorously tested at varying distances between the laser source and the PVC to understand the influence of distance on power transmission efficiency and overall performance.
To ensure practical application, the system was successfully integrated with a voltage and power regulator, enabling it to power a silicon photomultiplier (SiPM). The SiPM, known for its sensitivity and precision in detecting low levels of light, is a critical component in many high-energy physics experiments. Using a precise light source, we conducted a comprehensive series of tests to evaluate how this novel power source affects the sensor’s performance. Key parameters such as power conversion efficiency, noise levels, signal stability, and overall sensor functionality were carefully analyzed to ensure that the wireless power system meets the rigorous demands of experimental physics.
In addition to its immediate application in powering sensors, this technology has the potential to revolutionize experimental setups by enabling more compact and flexible designs. By eliminating or significantly reducing the dependence on traditional cabling, wireless power systems can improve system reliability, reduce electromagnetic interference, and simplify maintenance. Furthermore, the modular nature of laser-based power transmission allows for scalability and adaptability to various experimental requirements.
Looking ahead, this study represents a significant step toward integrating wireless power systems into high-energy physics experiments. The insights gained from this work could pave the way for broader adoption of such technologies in other domains, such as space exploration, remote sensing, and industrial applications. The results of this groundbreaking demonstration of wireless power transmission for a silicon sensor will be presented, highlighting its potential to transform the way power is delivered in complex experimental environments.

Speaker: Yan Benhammou (Tel Aviv University (IL))

15:00 The CMS ME0 Upgrade: Enhancing Forward Muon Reconstruction at the HL-LHC

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: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:00 → 15:30 Parallel: Quark Flavor 4

14:00 Correlating flavor anomalies and dark matter in the light of scalar leptoquark

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

14:20 A search for baryon-number violation in $B$-meson decays to two baryons.

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: Fabio Anulli (Sapienza Universita e INFN, Roma I (IT))

14:40 Heavy flavour hadron production and decays at ATLAS

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

15:30 → 16:00 Afternoon Break

16:00 → 17:30 Plenary: Wednesday

16:00 CMB measurements and prospects

16:30 Neutrino telescopes

Speaker: Aya Ishihara (Chiba)

17:00 Multi-messenger astrophysics

Speaker: Walter Winter

17:30 → 19:00 Community Events: Explore Downtown Madison!

19:00 → 21:00 Banquet

Thursday 28 August

09:00 → 10:30 Plenary: Thursday

09:00 B physics phenemenology

Speakers: Matthias Neubert, Matthias Neubert (Johannes Gutenberg Universitat Mainz), Matthias Neubert (Johannes Gutenberg University Mainz), Matthias Neubert (Unknown)

09:30 Invisible Cities: Imagining the next era of AI-enabled fundamental physics research

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))

10:00 Broadening participation in particle physics research

15m presentation + 15m discussion

Speaker: Saptaparna Bhattacharya (Southern Methodist University (US))

10:30 → 11:00 Morning Break

11:00 → 12:40 Parallel: Computing AI/ML 1

11:00 Efficient bin by bin profile likelihood minimization for precision measurements

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

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

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

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 Advancements in Tau Reconstruction and Identification at the CMS Detector

Advancements in Tau Reconstruction and Identification at the CMS Detector

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

11:00 → 12:40 Parallel: EWK Physics 3

11:00 Electroweak vector boson processes at the highest energies

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

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 Electroweak Precision Measurements at the FCC-ee

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:

1. 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.

2. 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))

12:00 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

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)

12:20 Effective Field Theory fits of the electroweak sector CMS data

Effective Field Theory fits of the electroweak sector CMS data

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

11:00 → 12:40 Parallel: Future Colliders 3

11:00 Overview of the FCC Program

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: Markus Klute (Karlsruhe Inst. of Technology (GER))

11:20 BSM physics opportunities at the FCC-ee

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: Markus Klute (Karlsruhe Inst. of Technology (GER))

11:40 Detector Challenges at a Muon Collider

Detector Challenges at a Muon Collider

Speaker: Karri Folan Di Petrillo (University of Chicago)

12:00 Pixel-based BIB suppression and DAQ impact at a multi-TeV Muon Collider

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))

11:00 → 12:40 Parallel: Heavy BSM Searches at Colliders 3

11:00 HH and Scalar+H resonant searches at the HL-LHC

HH and Scalar+H resonant searches at the HL-LHC

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

11:20 HH and Scalar+H resonant searches and their combination at CMS

HH and Scalar+H resonant searches and their combination at CMS

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

11:40 Recent results on searches with boosted Higgs at CMS

Recent results on searches with boosted Higgs at CMS

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

12:00 Search for a doubly charged Higgs boson produced via vector-boson fusion using the ATLAS detector

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

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

12:20 Recent Heavy resonances searches (including new scalars & BSM Higgs decays)

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

11:00 → 12:40 Parallel: Neutrino Physics 4

11:00 Measuring long-baseline neutrino oscillations with NOvA experiment

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

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: Dr Anna Holin

11:40 The PTOLEMY experiment: Direct Detection of the Cosmic Neutrino Background

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))

12:00 Recent results from SND@LHC

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: Nuno Leonardo (LIP)

12:20 The ESSnuSBplus project: Status and progress

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))

11:00 → 12:40 Parallel: Other Physics

11:00 TAMBO - A Novel Neutrino Telescope for High-Energy Astrophysical Neutrino Detection

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

11:20 LUXE: a high-precision experiment to study non-perturbative QED in electron-laser and photon-laser collisions

The Laser Und XFEL Experiment (LUXE), in planning at DESY Hamburg, is intended to study quantum electrodynamics (QED) in strong electromagnetic fields, and in particular the transition from perturbative to non-perturbative. In the non-perturbative regime, electron-positron pairs tunnel out of the vacuum in a manner akin to the Schwinger process. The experiment will make precision measurements of the photon and positron rates in collisions between a high-intensity laser pulse and the 16.5 GeV electron beam of the European XFEL, or the high-energy secondary photons it produces. This talk will provide an overview and update on the work of the LUXE collaboration, as the experiment moves towards implementation.

Speaker: LUXE Collaboration

12:40 → 14:00 Special Events: DEI Discussion

14:00 → 15:30 Parallel: Jet Physics

14:00 Jet performance and pileup mitigation in Run3 in CMS

Jet performance and pileup mitigation in Run3 in CMS

Every bunch crossing at the LHC causes not just one proton-proton interaction, but several which are called "pileup". With the increasing luminosity of the LHC the number of pileup interactions per bunch crossing increases and it will reach up to 200 during high-luminosity LHC operation. Removing the pileup from an event is essential, because it does not only affect the jet energy but also other event observables, for example the missing transverse energy, the jet substructure, jet counting and the lepton isolation. In addition, jets as an experimental signature of energetic quarks and gluons, need to be calibrated in order to have the correct energy scale. A detailed understanding of both the energy scale and the transverse momentum resolution of jets at the CMS is of crucial importance for many physics analyses. In this talk we present recent developments in terms of jet energy scale and resolution, substructure techniques and pileup mitigation techniques.

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:20 New techniques for reconstructing and calibrating hadronic objects with ATLAS

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

14:40 Classifying hadronic objects in ATLAS with ML/AI algorithms

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

15:00 Measurements of the Lund jet plane density in CMS

Measurements of the Lund jet plane density in CMS

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:00 → 15:30 Parallel: Computing AI/ML

14:00 Development of LLMs for DUNE

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

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

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 An AI Agent for Particle Physics Documentation

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))

14:00 → 15:30 Parallel: Exotic Searches 3

14:00 Searches for new physics in CMS in events with photons in the final state

Searches for new physics in CMS in events with photons in the final state

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:20 Searches for electroweak production of supersymmetric particles with the ATLAS detector

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

14:40 Searches in CMS for long-lived particles and other non-conventional signatures

Searches in CMS for long-lived particles and other non-conventional signatures

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

15:00 Searches for displaced decays of long-lived particles in final states with missing transverse momentum using the ATLAS detector

Many theories beyond the Standard Model (BSM) predict the presence of long-lived particles (LLPs) including including long-lived gluinos pair-produced via the strong interaction, long-lived neutralinos decaying to a Higgs boson, an exotic Higgs-portal model, among others. One of the most striking signatures due to the special reconstruction algorithms involved is due to charged particles decaying at significant distance from the interaction point (IP), thus producing an identifiable displaced vertex (DV). This talk will present results from the ATLAS Collaboration of a search for evidence of BSM processes that yield DVs together with significant missing transverse momentum using 13 TeV Run-2 data.

Speaker: ATLAS Speaker

14:00 → 15:30 Parallel: Hadron Physics 3

14:00 Light Meson Spectroscopy at BESIII

Using the world’s largest samples of $J/\psi$ and $\psi(3686)$ events produced in e+e- annihilation, BESIII is uniquely positioned to study light hadrons in radiative and hadronic charmonium decays. In particular, exotic hadron candidates including multiquark states, hybrid mesons and glueballs can be studied in high detail. Recent highlights on the light exotics searches, including observation of a glueball-like particle X(2370) , observation of X(2600) in J/ψ→γπ+π-η′, observation of the anomalous shape of X(1840) in J/ψ→γ3(π+π-), will be presented.

Speaker: Fabrizio Bianchi

14:20 Light Meson decays at BESIII

The world’s largest sample of J/ψ events accumulated at the BESIII detector offers a unique opportunity to investigate η and η′ physics via two body J/ψ radiative or hadronic decays. In recent years the BESIII experiment has made significant progresses in η/η′ decays. A selection of recent highlights in light meson spectroscopy at BESIII are reviewed in this report, including observation of the cusp effect in η′ →π0π0η, transition form factor measurements, as well as the search for rare/forbidden decays of η/η′.

Speaker: Fabrizio Bianchi

14:40 Measurement of the relative phase between strong and EM decays

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.

Speaker: Fabrizio Bianchi

15:00 Search for charm rare decays at BESIII

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: Fabrizio Bianchi

14:00 → 15:30 Parallel: Searches at Colliders

14:00 Exploring new physics in the Dark Sector at CMS

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: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:20 Heavy QCD axion with enhanced VBS production at Muon Collider

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 $aG\tilde{G}$ 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. Additionally, we find a set of vector-boson-scattering channels at MuC that dominate the axion production rate rather than the usual vector-boson-fusion channel.

Speaker: Peiran Li (University of Minnesota)

14:40 Recent Progress of DarkSHINE R&D

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.2024.07.003

DarkSHINE 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))

15:00 Searches for hadronically-decaying heavy vector bosons from the ATLAS Experiment

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

14:00 → 15:30 Parallel: Top Physics 3

14:00 ATLAS results at the ttbar threshold

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

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

14:20 EFT based searches in the top quark sector

EFT based searches in the top quark sector

Speaker: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

14:40 ATLAS EFT results in the top sector

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.

Speakers: ATLAS Speaker, Evelin Meoni (Universita della Calabria e INFN (IT))

15:00 Measurements of rare top production and their BSM interpretations

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: Niki Saoulidou (National and Kapodistrian University of Athens (GR))

15:30 → 16:00 Afternoon Break

16:00 → 17:30 Plenary: Thursday

16:00 CKM and CP violation at the LHC

Speakers: Vaia Papadimitriou, Dr Vaia Papadimitriou (Fermi National Accelerator Lab. (US))

16:30 Time-independent CP asymmetries

Speaker: Alexander Leon Gilman (University of Cincinnati (US))

17:00 Semi-leptonic decays

Speakers: Guglielmo De Nardo, Guglielmo De Nardo (University Federico II and INFN, Naples (IT))

17:30 → 18:00 Walk to UW Campus

18:00 → 19:00 Community Events: Public Lecture on UW Campus

Friday 29 August

09:00 → 10:30 Plenary: Friday 1

09:00 Neutrino physics phenomenology

Speakers: Carlos A. Argüelles-Delgado (Harvard University), Prof. Carlos Arguelles Delgado (Harvard University)

09:30 Juno status and plans

Speaker: Wang Yifang (IHEP,CAS)

10:00 Rare kaon decays

Speakers: Cristina Lazzeroni (University of Birmingham (GB)), Cristina Lazzeroni (University of Birmingham (GB)), Cristina Lazzeroni (University of Birmingham (GB))

10:30 → 11:00 Morning Break

11:00 → 12:30 Plenary: Friday 2

11:00 Rare decays in B and tau sectors

Speakers: Diego Tonelli (Fermilab), Diego Tonelli (Pisa), Diego Tonelli (INFN Trieste, Italy)

11:30 Precision and rare electroweak processes

Speaker: Jeffrey Berryhill (Fermi National Accelerator Lab. (US))

12:00 Searches for FIPs and LLPs

Speaker: Federico Leo Redi (Università degli Studi e INFN Milano (IT))

12:30 → 13:30 Special Events: Lunch

13:30 → 15:00 Plenary: Friday 3

13:30 Hadron spectroscopy

Speaker: Mark Richard James Williams (The University of Edinburgh (GB))

14:00 HVP measurements

Speaker: Zhiqing Philippe Zhang (IJCLab, Orsay (FR))

14:30 Latest g-2 results

Speakers: James Mott (UCL), James Mott, James Mott (Fermi National Accelerator Laboratory), James Mott (Boston University)

15:00 → 15:30 Afternoon Break

15:30 → 17:30 Plenary: Closing

15:30 CEPC status and plans

Speaker: Xinchou Lou (Chinese Academy of Sciences (CN))

16:00 European future collider plans

Speaker: Karl Jakobs (University of Freiburg (DE))

16:30 ICFA report

Speakers: Pierluigi Campana (Frascati), Pierluigi Campana (Laboratori Nazionali di Frascati (LNF))

16:50 Directors panel on future collider facilities

17:30 → 18:00 Free time

18:00 → 21:00 Community Events: Dane Dances - Rooftop Dance Party