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...
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.
In this work, a detailed analysis of neutrinoless double beta ($0\nu\beta\beta$) decay in a radiative neutrino mass model involving scalar leptoquarks ($S_1(\bar{3},1,1/3)$ and $\widetilde{R}_2(3,2,1/6)$) is performed and the interplay with the low-energy flavor observables is highlighted. The leptoquark parameter space is constrained by the neutrino masses and mixings, collider limits, and...
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...
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...
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...
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...
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...
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...
LFV decays of bosons at CMS
Measurements of the top quark properties and its production at its kinematic threshold
Recent results on Vector Like Quarks/Excited Fermions at CMS
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...
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...
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 ยฝ, i.e. a SUSY-lite;
2. U(1): Changes electric charge e to magnetic charge g with g=e/๏ก; 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....
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.
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...
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,...
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.
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...
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,...
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...
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...
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...
Probing new physics with dedicated data streams at CMS
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...
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...
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...
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...
The production of high-mass ๐-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...
Precise luminosity measurement at CMS
The production of ฯฮผ pairs in electron-positron collisions offers a powerful probe of lepton flavor violation. In this work, we calculate the e+eโโฯฮผ cross section within the framework of the Standard Model Effective Field Theory, allowing for arbitrary e+eโ beam polarizations. We then estimate the sensitivities of proposed future linear colliders, ILC and CLIC, to effective lepton...
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...
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...
We review linear e+eโ 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...
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,...
In this talk, I am going to review recent development of BSM theories.
A new digital optical module (DOM) has been developed for the proposed expansion to the IceCube detector at the South Pole, IceCube-Gen2. The โGen2-DOMโ 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,...
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...
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...
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...
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...
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...
The Super Tau Charm Facility (STCF), a planned symmetric electron-positron collider in China, aims to facilitate $e^+e^โ$ collisions across a center-of-mass energy range of 2 to 7 GeV, targeting a peak luminosity of $0.5ร10^{35}\mathrm{cm}^{โ2}\mathrm{s}^{โ1}$. With an anticipated annual integrated luminosity exceeding $1~ab^{โ1}$, the STCF is poised to generate vast datasets. These will...
Shedding Light on Dark Matter via the Higgs Portal
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...
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...
Vector Boson Scattering measurements at CMS
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 0.1โ0.2% at 45 GeV. This represents...
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...
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.
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...
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...
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.
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...
We discuss unusual ฮธ terms that can appear in field theories that allow global vortices. These "Cheshire ฮธ terms" induce Aharonov-Bohm effects for some particles that move around vortices. For example, a Cheshire ฮธ 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...
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...
Measurements of Triboson production at CMS
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...
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...
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 worldโs 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...
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...
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...
Increasing attention has been given recently to the theory and phenomenology of portal matter (PM) models โ 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...
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...
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...
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...
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 increased particle flux at the HL-LHC poses a significant challenge to the
ATLAS detectorโs 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...
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...
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...
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.
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...
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...
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 bosonsโNon-Standard Interactions (NSI)โcoupling to lepton...
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.
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 $C\!P$...
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...
Polarization in VV production in CMS
Searching solo for the invisible at CMS
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...
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...
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,...
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...
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...
Run 3 CMS Trigger Developments for New Physics Exploration
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...
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...
With the large datasets on ๐+๐โ-annihilation at the ๐ฝ/๐ and ๐(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...
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...
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...
Strategies and Performances of the CMS Trigger in Run 3
Electroweak boson properties at CMS
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...
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...
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 DAฮฆNE LINAC on a diamond fixed target.
The beam energy has been varied in the range
265โ300 MeV, corresponding to values of โs between 16.4 and 17.5 MeV,
completely covering the the CoM...
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...
CICADA: Real-Time Anomaly Detection with Calorimeter Images at the CMS Level-1 Trigger
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...
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...
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.
Alpha_s measurements with the CMS experiment
Soft QCD measurements, diffractive and exclusive processes with CMS data
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...
Event shape variables in pp collisions in CMS
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...
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...
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...
HH and Scalar+H resonant searches at the HL-LHC
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...
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...
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...
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...
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...
HH and Scalar+H resonant searches and their combination at CMS
We present a new algorithm for tagging the production flavour of neutral ๐ต0 and ๐ต0๐ 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...
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...
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...
Detector Challenges at a Muon Collider
The FCC-ee program uniquely combines ultraโclean experimental conditions with precise center-of-mass energy calibrationโfrom the Z pole through the top-quark pair thresholdโand extraordinarily large event samples of Z and WW bosons. This combination unlocks both direct and indirect probes of physics beyond the standard model through:
- High-precision electroweak measurements in neutral...
Recent results on searches with boosted Higgs at CMS
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...
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...
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...
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...
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<๐<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...
Presented by Hyon-San Seo
Recently, the CMS collaboration published measurements of the forward-backward asymmetry (angular coefficient $A_4(M)$)) in DrellโYan 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...
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...
Advancements in Tau Reconstruction and Identification at the CMS Detector
Effective Field Theory fits of the electroweak sector CMS data
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...
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...
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,...
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...
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.
Measurements of the Lund jet plane density in CMS
