Neutrinos are the most elusive particles known. Heavier sterile neutrinos mixing with the Standard Model partners might solve the mystery of the baryon asymmetry of the universe and take part in the mass generation mechanism for the light neutrinos. Future lepton colliders, including $e^+e^-$ Higgs factories, as well as multi-TeV electron and muon machines, will provide the farthest search...
The ATLAS Open Data project has for many years successfully delivered open-access data, simulations, documentation and related resources for education and outreach use in High Energy Physics and related computer sciences based on data collected in proton–proton collisions at 8 TeV and 13 TeV. These resources have found substantial application worldwide in Universities, in Schools, and in other...
The ATLAS Collaboration consists of more than 5000 members, from over 100 different countries. Regional, age and gender demographics of the collaboration are presented, including the time evolution over the lifetime of the experiment. In particular, the relative fraction of women is discussed, including their share of contributions, recognition and positions of responsibility, including...
Physicists investigate the subatomic world by bombarding their subject of study with a hail of tiny subatomic “bullets”. From the way these “bullets” bounce off their target one can infer a wealth of detailed information about the target’s structure. Different kinds of subatomic “bullets” probe different aspects of the target, certain important aspects of the force holding atomic nuclei...
Jiangmen Underground Neutrino Observatory (JUNO), located in the southern part of China, will be the world’s largest liquid scintillator (LS) detector upon completion. Equipped with 20 kton LS, 17612 20-inch PMTs and 25600 3-inch PMTs in the central detector, JUNO will provide a unique apparatus to probe the mysteries of neutrinos, particularly the neutrino mass ordering puzzle. One of the...
With the large data sets of $e^+e^-$ annihilation at the $J/\psi$ and $\psi(3686)$ resonances collected by the BESIII experiment, multi-dimensional analyses making use of polarisation and entanglement can shed new light on the production and decay properties of hyperon-antihyperon pairs. In a series of recent studies performed at BESIII, significant transverse polarization of the...
The contributions of LGBTQIA+ people to the scientific endeavour have been minimised and historically erased. This problem is especially acute in physics where discrimination and poor representation have contributed to a lack of LGBTQIA+ people in the field. In this work, we analyse the historic contributions of LGBTQIA+ people to physics research and education, using a sexually discursive...
Charged lepton flavour violation (CLFV) provides an experimental probe into new physics beyond the Standard Model. The COMET experiment at J-PARC in Tōkai, Japan will be using the highest intensity muon beam yet to search for muon to electron conversion, a CLFV process, with the best sensitivity so far. Taking a staged approach to this search, Phase-I of COMET will begin in 2024 with a planned...
The innermost tracking system of the CMS experiment consists of two tracking devices, the Silicon Pixel and Silicon Strip detectors. The tracker was specifically designed to very accurately determine the trajectory of charged particles or tracks.
In this talk, the preliminary performance of the tracker detectors during the Run 3 operation will be summarized, with particular emphasis on the...
In light of the precise experimental measurements of the heavy flavor baryons, we calculate the isospin mass splitting of charm baryons by incorporating isospin symmetry breaking. We obtain the masses of $J^P=\frac{1}{2}^{(\prime) +}$ and $\frac{3}{2}^+$ charm baryons utilizing the effective mass scheme based on single gluon exchange interaction between the spectator quarks inside the baryons....
In modern high energy physics experiments, one of the biggest challenges is handling an enormous amount of data in a short time period. This is important to achieve higher statistics while keeping the modest data throughput rate with sustainable resources. In COMET Phase-I, which is searching for the muon to electron conversion with a highly intense muon beam, we are going to implement the...
The isolation of pure samples of quark and gluon jets is of key interest at hadron colliders. Recent work has employed topic modeling to disentangle the underlying distributions in mixed samples obtained from experiments. However, current implementations do not scale to high-dimensional observables as they rely on binning the data. In this work we introduce TopicFlow, a method based on...
The Cherenkov Telescope Array (CTA) is poised to revolutionise gamma-ray astronomy. One of the key science goals of CTA is the detection of gamma rays from dark matter annihilation. In this talk, I will describe a new Bayesian pipeline for the detection of dark matter using CTA data. The pipeline builds on top of the popular Gammapy package. The dark matter signal model is described in terms...
The detailed methodology and results of CMS for the most recent Higgs boson mass measurements are presented.
Experimental uncertainties related to hadronic object reconstruction can limit the precision of physics analyses at the LHC, and so improvements in performance have the potential to broadly increase the impact of results. Hadronic object reconstruction is also one of the most promising settings for cutting-edge machine learning and artificial intelligence algorithms at the LHC. Recent...
The ATLAS experiment in the LHC Run 3 is recording up to 3 kHz of fully-built physics collision events out of an LHC bunch crossing rate of up to 40 MHz, with additional rate dedicated to partial readout. A two-level trigger system selects events of interest to to cover a wide variety of physics while rejecting a high rate of background events. The selection of events targets both generic...
T2K is a long base line neutrino experiment in Japan with a 295 km base line between the JPARC facility, which produces the neutrino beam, and the SuperKamiokande water Cherenkov far detector. T2K has a rich physics programme including a series of world leading neutrino cross-section measurements. The current status of T2K cross-section measurements will be summarised and the future plans of...
Decays of beauty hadrons to charmless final sates receive relevant contributions from penguin topologies where new physics beyond the Standard Model may appear as virtual contributions. The presence of these new particles can be revealed comparing the branching fractions and CP asymmetries of these decays with the Standard Model expectations. In addition, the combination of several quantities...
The proposed STCF is a symmetric electron-positron beam collider designed to provide e+e− interactions at a centerof-mass energy from 2.0 to 7.0 GeV. The peaking luminosity is expected to be 0.5×10^35 cm−2s−1. STCF is expected to deliver more than 1 ab−1 of integrated luminosity per year. The huge samples could be used to make precision measurements of the properties of XYZ particles; search...
The Jiangmen Underground Neutrino Observatory (JUNO), a 20 kton multi-purpose low background liquid scintillator detector, was proposed primarily to determine the neutrino mass ordering. To suppress the radioactivity from surrounding rocks and tag the cosmic muons, the central detector is submerged in a water Cherenkov detector (WCD), which is filled with 35 kton ultrapure water and equipped...
The SABRE (Sodium iodide with Active Background REjection) experiment aims to detect an annual rate modulation from dark matter interactions in ultra-high purity NaI(Tl) crystals which will provide a model independent test of the signal observed by DAMA/LIBRA. It will consist of two separate detectors in the Northern and Southern hemispheres. SABRE South will be located in the newly completed...
Engaging children under the age of 12 in physics research is particularly challenging but offers unique educational potential. Outreach and engagement at an early age has been demonstrated to be key to increasing awareness of physics and to increasing diversity in the field in later years. We present a variety of activities and resources developed by the ATLAS Collaboration targeting this...
During the last 15 years the "Radio MontecarLow" ("Radiative Corrections and Monte Carlo Generators for Low Energies") Working Group, see www.lnf.infn.it/wg/sighad/, has been providing valuable support to the development of radiative corrections and Monte Carlo generators for low energy $e^{+}e^{-}$ data and tau-lepton decays.
Its operation started in 2006 and proceeded until the last few...
The proposed Circular Electron Positron Collider (CEPC) imposes new challenges for the vertex detector in terms of pixel size and material budget. A Monolithic Active Pixel Sensor (MAPS) prototype, TaichuPix, based on a column drain readout architecture, has been implemented to achieve high spatial resolution and fast readout.
In December 2022, a beam test system consisting of 6 layer...
Various theories beyond the Standard Model predict new, long-lived particles with unique signatures which are difficult to reconstruct and for which estimating the background rates is also a challenge. Signatures from displaced and/or delayed decays anywhere from the inner detector to the muon spectrometer, as well as those of new particles with fractional or multiple values of the charge of...
With technically mature design and well understood physics program, ILC is a realistic option for realization of a future Higgs factory. Energy staged data collection, employment of beam polarization and capability to reach a TeV center-of-mass energy, enable unique sensitivity to New Physic's deviations from the Standard Model predictions, also in the Higgs sector. Coupling precisions of the...
The $U(1)_{T 3R}$ extension of the Standard Model is an attractive formulation that addresses the mass hierarchy between the third and the first two generations of fermions, explains thermal dark matter abundance, and the muon $g - 2$ and $R_{K(*)}$ anomalies. The model contains a dark matter candidate, the $\phi$ particle, and a vector-like quark scalar and vector mediator, the $\chi_u$...
Lorentz Invariance Violation (LIV) is a fundamental violation of space-time symmetry, implying that physical laws vary under Lorentz transformation. The neutrinos are weakly interacting fundamental particles which can act as a probe for understanding the violation of Lorentz invariance symmetry. Here, we consider intrinsic LIV effects that can exist even in a vacuum. We use an effective field...
The inner detector of the present ATLAS experiment has been designed and developed to function in the environment of the present Large Hadron Collider (LHC). At the ATLAS Phase-II Upgrade, the particle densities and radiation levels will exceed current levels by a factor of ten. The instantaneous luminosity is expected to reach unprecedented values, resulting in up to 200 proton-proton...
The precise estimate of the ratio $|V_{ub}|/|V_{cb}|$ is of utmost importance since it plays an essential role in the determination of the sides of the Unitarity Triangle and is an important ingredient in understanding the CKM picture of the
Standard Model. It can be measured directly or indirectly from the extraction of $|V_{ub}|$ and $|V_{cb}|$ from the respective exclusive and inclusive $b...
In recent years, long-lived particles (LLPs) have been widely considered in a variety of Beyond the Standard Model (BSM) scenarios and in many different experimental searches for new particles. Future $e^+e^−$ colliders, thanks to their clean environment and triggerless operation, offer a unique opportunity to search for such states at sub-TeV energies. Considered in this contribution are...
Hyper-Kamiokande is a large-scale water Cherenkov neutrino detector with a broad physics programme that is currently under construction in Japan. The detector will comprise of two concentric cylindrical detectors referred to as the inner and outer detectors, ID and OD. The ID will be instrumented with 20” PMTs and mPMTs, and used to detect neutrino interactions. The OD serves a different...
The LUXE experiment (Laser Und XFEL Experiment) is an experiment in planning at DESY Hamburg using the electron beam of the European XFEL. LUXE is intended to study collisions between a high-intensity optical laser pulse and 16.5 GeV electrons from the XFEL electron beam, as well as collisions between the laser pulse and high-energy secondary photons. This will elucidate quantum...
Using the BESIII detector, the R value has been measured on 14 energy points with the corresponding c.m. energies going from 2.2324 to 3.6710 GeV. The statistical uncertainty of the measured R is less than 0.6%. Two different simulation models, the LUARLW and a new Hybrid generator, have been used and give consistent detection efficiencies and initial-state-radiation corrections.
The accuracy...
We present recent measurements of charmonia decays from BESIII. Using a sample of 448 million $\psi(3686)$ events, the branching fraction of the decays $\chi_c^J \to \phi \phi$ (J=0,1,2) has been measured with improved precision, and the polarisation parameters of the same decay have been determined for the first time via an helicity amplitude analysis. Using the same data sample, the first...
The SABRE (Sodium iodide with Active Background REjection) experiment aims to detect an annual rate modulation from dark matter interactions in ultra-high purity NaI(Tl) crystals in order to provide a model independent test of the signal observed by DAMA/LIBRA. It is made up of two separate detectors; SABRE South located at the Stawell Underground Physics Laboratory (SUPL), in regional...
The Jiangmen Underground Neutrino Observatory (JUNO) is located in Jiangmen, Guangdong, China, with an overburden of about 700 meters, and its installation is expected to be completed in 2023. The primary goal of the JUNO experiment is to determine the neutrino mass hierarchy with a significance of 3~4 σ in 6 years of data taking and to precisely measure the mixing parameters.
An...
The Large Hadron Collider at CERN will undergo a major upgrade in the Long Shutdown 2 from 2026-2028. The High Luminosity LHC (HL-LHC) is expected to deliver peak instantaneous luminosities up to 7.5E34/cm2/s and an integrated luminosity in excess of 3000/fb during ten years of operation. In order to fully exploit the delivered luminosity and to cope with the demanding operating conditions,...
The asymmetric dark matter (ADM) paradigm is motivated by the apparent coincidence (5:1 ratio) between the cosmological mass densities of visible and dark matter. However, most ADM models only relate the number densities of visible and dark matter, and do not motivate the similarity in their particle masses. One exception is a framework introduced by Bai and Schwaller, where the dark matter is...
The structure of hadrons relevant for deep-inelastic scattering are completely characterised by the Compton amplitude. A direct calculation of the Compton amplitude provides a complementary way to accessing the structure functions on the lattice, circumventing the operator mixing and renormalisation issues of the standard operator product expansion approach.
In this contribution, we focus...
The DAMA experiments have detected a modulating signal compatible with dark matter for 20 years with a combined significance of 12.9σ. A result in tension for a spin independent WIMP with null results from large noble gas experiments. This is the motivation for SABRE (Sodium iodide with Active Background Rejection) South experiment. A NaI(Tl) based replication of the DAMA experiment. It is...
In recent times, several hints of lepton flavour universality violation have been observed in semileptonic B decays, which point towards the existence of New Physics beyond the Standard Model. In this context, we consider a new variant of $U(1)_{L_{\mu}-L_{\tau}}$ gauge extension of Standard Model, containing three additional neutral fermions $N_{e}, N_{\mu}, N_{\tau}$, along with a...
The SABRE (Sodium iodide with Active Background REjection) experiment aims to detect an annual rate modulation from dark matter interactions in ultra-high purity NaI(Tl) crystals in order to provide a model independent test of the signal observed by DAMA/LIBRA. SABRE South is located at the Stawell Underground Physics Laboratory (SUPL), in regional Victoria, Australia.
SABRE South is...
We present a novel method that measures the relative strong phase, $\Delta \delta_D$, between $D^0$ and $\bar{D}^0$ amplitudes decaying to the $K_S^0 \pi^+ \pi^-$ final state measured from correlated $D\bar{D}$ pairs produced at the charm threshold, and its application to the measurement of $CP$ violating observables in $B^\pm \to DK^\pm$ decays which includes the measurement of the CKM angle,...
The recent discovery at the LHC of order-of-magnitude enhancements of the $\Lambda_c/D$ ratio (relative to its LEP value) at low pT, and several related measurements, has prompted renewed interest in baryon production in hadron collisions, especially in the heavy-flavour sector. One scenario that successfully accounts for (and in fact predicted) these effects is based on QCD colour...
The High-Luminosity LHC (HL-LHC) era will herald significant increases in both the instantaneous luminosity and the number of interactions per bunch crossing. To cope with these significantly more complex conditions, detector upgrades are planned to maintain and surpass the current physics performance. The replacement of the current Inner Detector with a new all-silicon Inner Tracker (ITk) is...
The high center-of-mass energy of proton-proton collisions and the large available datasets at the CERN Large Hadron Collider allow to study rare processes of the Standard Model (SM) with unprecedented precision and search for new physics that might enhance extremely rare processes in the SM. Measurements of rare SM processes provide new tests of the SM predictions with the potential to unveil...
The high granularity tracker of CMS is the largest silicon tracker ever built with 1856 pixel and 15148 strip detector modules that provide accurate track reconstruction. To achieve high precision in measurements of the momenta of charged particles, corrections for the position, rotation and curvature of these modules must be found; such a procedure is known as tracker alignment. Magnet...
The Time Of internally Reflected CHerenkov detector (TORCH) is a proposed large-area time-of-flight detector, designed to enhance the particle identification performance of the Upgrade-II LHCb experiment in the 2–15 GeV/c momentum range. A TORCH module consists of a 10 mm thick quartz plate of dimensions 2.5 x 0.66 m$^2$ from which the positions and arrival times of Cherenkov photons from a...
The construction of a worldwide network of gigaton-scale neutrino telescopes aims to address multiple open questions in physics, such as the origin of astrophysical neutrinos and the acceleration mechanism of high-energy cosmic rays. Besides astrophysics, neutrino telescopes probe center-of-mass energies similar to colliders, offering an additional window into high-energy particle...
The SABRE (Sodium-iodide with Active Background REjection) South experiment, located at the Stawell Underground Physics Laboratory (SUPL) in Australia, aims to measure an annual modulation in dark-matter interactions using ultra-high-purity NaI(Tl) crystals. In partnership with the SABRE North effort at the Gran Sasso National Laboratory (LNGS), SABRE South is designed to disentangle any...
The low cross section of WIMP-nucleus scattering makes detecting dark matter directly extremely difficult. To make sure a signal originates from WIMP scattering, all the backgrounds of a dark matter experiment need to be carefully studied and reduced. Among all these backgrounds, muons can mimic the annual modulation signals expected from dark matter. Therefore, the distribution of muons...
In the high-luminosity era of the Large Hadron Collider, the instantaneous luminosity is expected to reach unprecedented values, resulting in up to 200 proton-proton interactions in a typical bunch crossing. To cope with the resulting increase in occupancy, bandwidth and radiation damage, the ATLAS Inner Detector will be replaced by an all-silicon system, the Inner Tracker (ITk). The innermost...
Muon reconstruction performance plays a crucial role in the precision and sensitivity of the Large Hadron Collider (LHC) data analysis of the ATLAS experiment. Using di-muon Resonances we are able to calibrate to per-mil accuracy the detector response for muons. Innovative techniques developed throughout the Run-2 period and during the LHC shut-down significantly improve the measurement of...
The Monitored Drift Tube (MDT) chambers Trigger Processor (MDT-TP) is a key component in the upgrade of the first-level muon trigger for ATLAS at the High-Luminosity LHC (HL-LHC). The selectivity of the current system is limited by the moderate spatial resolution of the trigger chambers: Resistive Plate Chambers (RPC) and Thin Gap Chambers (TGC). The MDT-TP incorporates the high-resolution MDT...
