The CMS Electromagnetic Calorimeter (ECAL) is the largest crystal calorimeter operating in a high energy physics experiment. Since its installation in CMS, it has made fundamental contributions to the CMS physics program by precisely measuring the energy, position, and timing of photons, electrons, and hadronic jets. The excellent ECAL energy resolution facilitated the observation of the Higgs...
The Belle II experiment at the SuperKEKB energy-asymmetric e+e− collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is 6×1035 cm−2s−1 and the Belle II experiment aims to ultimately record 50 ab−1 of data, a factor of 50 more than its predecessor. With this data set, Belle II will be able to measure the...
Spin structures are important properties of nucleons. At the Relativistic Heavy Ion Collider (RHIC), the PHENIX experiment probed longitudinal spin structures by colliding two longitudinally polarized protons ($\vec{p}+\vec{p}$) and measuring its spin asymmetry ($A_{LL}$) of a variety of final states. Colliding a transversely polarized proton with a nucleon/ion ($\vec{p}+p/A$) provides similar...
Cross sections, couplings, and properties of the Higgs boson - 10th anniversary of the discovery (CMS)
A review of the discovery of the Higgs boson and subsequent measurements of its properties will be presented.
Many theories beyond the Standard Model (BSM) have been proposed to address several of the Standard Model's shortcomings, such as the origin of dark matter and neutrino masses, the fine-tuning of the Higgs Boson mass, or the observed pattern of masses and mixing angles in the quark and lepton sectors. Many of these BSM extensions predict new particles or interactions directly accessible at the...
Top quark physics with the CMS detector
The large top quark samples in top quark pair and single top production have yielded measurements of the production cross section of unprecedented precision and in new kinematic regimes. They have also enabled new measurements of top quark properties that were previously inaccessible, enabled the observation of many rare top quark production processes predicted by the Standard Model and...
We will present the latest results for searches of particles and
interactions beyond those of the standard model performed with the
proton-proton collision dataset acquired with the CMS detector. Results
include the full Run 2 dataset and the expectations for Run 3 will also be
discussed.
With technically mature design and well understood physics program, ILC is realistic option for realization of a Higgs factory. With a unique physics reach of a linear collider, ILC meaningfully complement projections for HL-LHC. Energy staged data collection, employment of beam polarization and capability to reach a TeV center-of-mass energy enable unique precision to probe BSM models above...
The ICARUS collaboration employed the 760-ton T600 detector in a successful three-year physics run at the underground LNGS laboratories studying neutrino oscillations with the CNGS neutrino beam from CERN, and searching for atmospheric neutrino interactions. ICARUS performed a sensitive search for LSND-like anomalous νe appearance in the CNGS beam, which contributed to the constraints on the...
Recent results obtained from leading cosmic ray experiments indicate that simulations using LHC-tuned hadronic interaction models underestimate the number of muons in extensive air showers compared to expectations based on hadronic models. This is the so-called muon deficit problem. Determination of the muon component in the air shower is crucial for inferring the mass of the primary...
Relativistic heavy-ion beams at the LHC are accompanied by a large flux of equivalent photons, leading to multiple photon-induced processes. This talk presents a series of measurements of such processes performed by the ATLAS Collaboration. New measurements of exclusive dilepton production (electron, muon, and tau pairs) are discussed. Furthermore, the tau-pair production measurements can...
The CMS collaboration performed searches for Dark Matter (DM) particles directly produced in pairs in proton-proton collisions. Investigated signatures include a single energetic object and a significant transverse momentum imbalance, strongly coupled DM production or decays in so-called hidden sectors. The Run 2 LHC at a centre-of-mass energy of 13 TeV, corresponding to an integrated...
SND@LHC is a compact and stand-alone experiment to perform measurements with neutrinos produced at the LHC in a hitherto unexplored pseudo-rapidity region of 7.2 < 𝜂 < 8.6, complementary to all the other experiments at the LHC. The experiment is to be located 480 m downstream of IP1 in the unused TI18 tunnel. The detector is composed of a hybrid system based on an 800 kg target mass of...
The Recoil Directionality project (ReD) within the Global Argon Dark Matter Collaboration aims to characterize the light and charge response of a liquid argon (LAr) dual-phase Time Projection Chamber (TPC) to neutron-induced nuclear recoils. The main goal of the project is to probe for the possible directional dependence suggested by the SCENE experiment. Furthermore, ReD is also designed to...
The main source of systematic uncertainty on neutrino cross section measurements at the GeV scale is represented by the poor knowledge of the initial flux. The goal of cutting down this uncertainty to 1% can be achieved through the monitoring of charged leptons produced in association with neutrinos, by properly instrumenting the decay region of a conventional narrow-band neutrino beam. Large...
After 9 years of successful operation in proton-proton collisions at $\sqrt{s}$ = 13 TeV, the ATLAS detector started in 2018 the preparations for an ambitious physics project, aiming the exploration of very rare processes and extreme phase spaces, an endeavor that will require a substantial increase in the amount of data to be taken. To accomplish this purpose, a comprehensive upgrade of...
The High Luminosity upgrade of the LHC (HL-LHC) at CERN will provide unprecedented instantaneous luminosity of ~5 x 10^34cm −2s−1, leading to an average of 150-200 simultaneous collisions. This extreme instantaneous luminosity scenario represents a real challenge for the detectors. The barrel region of the CMS electromagnetic calorimeter (ECAL) will be preserved but operated at a lower...
From 2018 to the beginning of 2022, the CMS experiment has performed the Long Shutdown 2 (LS2) upgrade campaign, aiming at adapting the detectors for the future conditions foreseen for High Luminosity Large Hadron Collider (HL-LHC) phase. This project has the main objective of increasing the instantaneous luminosity up to a factor of five beyond the design LHC instantaneous luminosity (5⋅10^34...
Recent highlights from ATLAS, in all physics areas except heavy ions.
This talk reviews the most important and recent results with the data collected by the CMS Collaboration.
Review of recent LHCb physics analysis result
The presence of a non-baryonic Dark Matter (DM) component in the Universe is inferred from the observation of its gravitational interaction. If Dark Matter interacts weakly with the Standard Model (SM) it could be produced at the LHC. The ATLAS experiment has developed a broad search program for DM candidates in final states with large missing transverse momentum produced in association with...
Run 2 of the LHC has witnessed the observation of many rare top quark production
processes predicted by the Standard Model and has boosted searches for flavour-
changing-neutral-current interactions of the top quark, that are heavily suppressed in the SM. In this contribution the highlights are shown of searches by the ATLAS experiment for rare processes involving top quarks. Results are...
The ability to differentiate between hadronically decaying massive particles is increasingly important to the LHC physics program. A variety of tagging algorithms for large-radius jets, reconstructed from unified-flow-objects (UFOs), are presented to identify jets containing the hadronic decay of W/Z bosons and top quarks, including both cut-based taggers and machine learning discriminants....
The NUCLEUS experiment aims to perform a high-precision measurement of the coherent elastic neutrino–nucleus scattering (CEvNS) at the EdF Chooz B nuclear power plant in France. CEvNS is a unique process to study neutrino properties and to search for new physics beyond the Standard Model. CEvNS could also represent an unshieldable background for high-sensitivity dark matter experiments....
The NA62 experiment at CERN collected the world's largest dataset of charged kaon decays in 2016-2018, leading to the first measurement of the Branching Fraction of the ultra-rare K+ --> pi+ nu nu decay, based on 20 candidates. This provides evidence for the very rare K+→π+νν¯ decay, observed with a significance of 3.4σ. This measurement is also used to set limits on BR(K+→π+X), where X is a...
Many theories beyond the Standard Model predict new phenomena, such as heavy vectors or scalar, vector-like quarks, and leptoquarks in final states containing bottom or top quarks. Such final states offer great potential to reduce the Standard Model background, although with significant challenges in reconstructing and identifying the decay products and modelling the remaining background. The...
Recent measurements from ALICE, CMS and LHCb Collaboration of exclusive production of J/ψ mesons in ultraperipheral heavy-ion collisions at the LHC have given us new access to the interaction of small color dipoles with cold nuclear matter. We discuss the role of cc̄ g-Fock states in the diffractive photoproduction of J/ψ-mesons. We have demonstrated, that the...
NOvA is an accelerator-based long-baseline neutrino experiment designed to study neutrino oscillations. In particular, NOvA aims to understand the dominance of matter over antimatter in the universe, to resolve the ordering of neutrino masses, and to resolve the octant of neu- trino mixing angle. For its physics goals NOvA uses two functionally-identical detectors. The Near Detector (ND) is...
We discuss photon-photon fusion mechanisms of dilepton production in proton-proton collisions with rapidity gap in the main detector and one forward proton in the forward proton detectors. This is relevant for the LHC measurements by ATLAS+AFP and CMS+PPS. Transverse momenta of the intermediate photons are taken into account and photon fluxes are expressed in terms of proton electromagnetic...
The Spherical Neutral Detector (SND) collects data at the VEPP-2000 $e^+e^-$ collider in Novosibirsk. In this talk we present the latest SND results on study of exclusive processes of $e^+e^-$ annihilation into hadrons at c.m. energies below 2 GeV. In particular, we discuss the measurement of the $e^+e^-\to\pi^+\pi^-$ cross section in the energy range 0.53--0.88 GeV, the measurements of the...
The Super-Kamiokande (SK) experiment has now the potential of detecting yet-unobserved neutrinos coming from different astronomical sources after the gadolinium loading of the water in July, 2020. The improvement in identification of neutrons emitted from inverse beta decay reactions enhances therefore SK’s sensitivity to low energy electron anti-neutrinos. Pre-supernova stars, which are...
Summary of recent Higgs boson results from ATLAS
Measurements of the fundamental properties of the Higgs boson are presented, including its mass, width, and the CP properties of its coupling in various production modes and decay channels.
Very detailed measurements of Higgs boson properties and its interactions can be performed with the full Run 2 pp collision dataset collected at 13 TeV, shining light on the electroweak symmetry breaking mechanism. This talk presents the latest measurements of the Higgs boson coupling properties by the ATLAS experiment in various bosonic and fermionic decay channels, as well as their...
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. While the Standard Model makes a definite prediction for the Higgs boson self-coupling...
A detector containing two radiopure cadmium tungstate crystal scintillators enriched in $^{116}$Cd at 82% ($^{116}$CdWO$_4$) with total mass of 1.2 kg was operated during 35324 h at the Gran Sasso Underground Laboratory (INFN, Italy) with the main aim to investigate double beta decay of $^{116}$Cd. As a by-product of the experiment, a new upper limit on atomic abundance of hypothetical...
The NA62 experiment at CERN took data in 2016--2018 with the main goal of measuring the K+ -> pi+ nu nubar decay.
The NA62 dataset is also exploited to search for light feebly interacting particles produced in kaon decays. Searches for K+→e+N, K+→μ +N and K+→μ+νX decays, where N and X are massive invisible particles, are performed by NA62. The N particle is assumed to be a heavy neutral...
With the pp collision dataset collected at 13 TeV, detailed measurements of Higgs boson properties can be performed. The Higgs kinematic properties can be measured with increasing granularity and interpreted to constrain beyond-the-Standard-Model phenomena. This talk presents the measurements of the Higgs boson fiducial and differential cross sections exploiting various Higgs boson decays, as...
The discovery of the Higgs boson with a 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 solely capable of explaining some observations. Many extensions of the Standard Model addressing such shortcomings introduce additional Higgs-like bosons which can be either...
We study the heavy-light baryons in picture of heavy quark-light diquark cluster. Modified Regge relation between mass and angular momentum, derived using flux tube model, is used to predict spin-average masses. Spin dependent interactions are also included to compute mass spectrum of heavy-light baryons. Predicted masses of these systems matches well with experimentally observed masses. We...
The large top quark samples in top quark pair and single top production have yielded
measurements of the production cross section of unprecedented precision and
in new kinematic regimes. They have also enabled new measurements of top quark properties that were previously inaccessible. In this contribution the highlights of
the ATLAS top quark precision program are presented. ATLAS...
The full optimization of the design and operation of instruments whose functioning relies on the interaction of radiation with matter is a super-human task, given the large dimensionality of the space of possible choices for geometry, detection technology, materials, data-acquisition, and information-extraction techniques, and the interdependence of the related parameters.
On the other...
Nearly all physics analyses at CMS rely on precise reconstruction of particles from their signatures in the experiment’s calorimeters. This requires both assignment of energy deposits to particles and recovery of various properties across the detector. These tasks have traditionally been performed by classical algorithms and BDT regressions, both of which rely on human-engineered high level...
A first look at run 3 data from ATLAS.
The New Small Wheel upgrade of the ATLAS Muon Spectrometer at the LHC collider employs two detector technologies, the resistive Micromegas chambers and the small-strip Thin Gap Chambers, with a total of 2.45 M analog readout channels.
The electronics is required to support the two different detector technologies and provide both precision readout for tracking and a fast trigger. It will...
CMS selects interesting events using a two-tiered trigger system. The first level (L1), composed of custom hardware processors, uses information from the calorimeters and muon detectors to select events at a rate of around 100 kHz within a fixed latency of about 4$\mu$s. The second level, the high-level trigger (HLT), consists of a farm of processors running a version of the full event...
The Compact Muon Solenoid (CMS) detector at the CERN Large Hadron Collider (LHC) is undergoing an extensive Phase II upgrade program to prepare for the challenging conditions of the High-Luminosity LHC (HL-LHC). In particular, a new timing layer with hermetic coverage up to a pseudo-rapidity of |η|=3 will measure minimum ionizing particles (MIPs) with a time resolution of ~30ps. This MIP...
Jets and Missing transverse momentum (MET), used to infer the presence of high transverse momentum neutrinos or other weakly interacting neutral particles, are two of the most important quantities to reconstruct at a hadron collider. They are both used by many searches and measurements in ATLAS. New techniques combining calorimeter and tracker measurements, called Particle Flow and Unified...
The idea of a Muon Collider facility has regained interest in the context of future colliders R&D. It promises in fact great performances as Higgs factory and in terms of Beyond the Standard Model Physics, especially for Dark Matter portals. Despite the good physics potential and feasible infrastructure requirements, the construction of such a machine comes with relevant design challenges...
In the framework of the Standard Model we present a new theoretical predictions for partial widths, double and single differential distributions for four-leptonic decays of B_d - mesons. We consider the contributions of ω(782) and ρ(770) - resonances, vector charmonium resonances contributions, non-resonance contribution of the bb¯ - pairs, leading contribution of “weak annihilation” and...
Recent heavy flavour results from the ATLAS proton-proton collision dataset will be presented. Measurements of charmonium and B meson production will be reported. Results on B_c production and decays will also be discussed. New results on exotic resonances will be shown. The latest ATLAS measurements of the CP violation and rare decays will be reviewed.
Ultra-peripheral collisions of heavy ions give physicists an opportunity for studies of two-photon induced processes in a clean environment with strongly suppressed hadronic interactions. In particular, measurements of cross section of the process $\mathrm{Pb}+\mathrm{Pb} \rightarrow \mathrm{Pb}+\mathrm{Pb} + \tau^{+}\tau^{-}$ can be used to set new constraints on poorly known anomalous...
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 multiple values of the charge of the electron...
The production of jets and photons at hadron colliders provide stringent tests of perturbative QCD. We present the latest measurements using proton-proton collision data collected by the ATLAS experiment at sqrt(s)=13 TeV. We will discuss the measurement of new event-shape jet observables defined in terms of reference geometries with cylindrical and circular symmetries using the energy...
Small review of no-go theorem in scalar-tensor theory (Horndeski theory and beyond) and recent advances in possibilities to avoid it. That includes disformal connection between different subclasses, models with strong gravity in the past and some special cases without instabilities.
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. This talk will present the latest results from SUSY searches conducted by the ATLAS experiment. The searches target multiple final states and different assumptions about the decay mode of the produced SUSY particles,...
Various Supersymmetry (SUSY) scenarios, including split SUSY and anomaly or gravity-mediated SUSY-breaking scenarios, lead to signatures with long-lived particles. Searches for these processes may target either the long lived particle itself or its decay products at a significant distance from the collision point. These signatures provide interesting technical challenges due to their special...
In this paper, we study the prospect of ECAL barrel timing to develop
triggers dedicated to long-lived particles decaying to jets, at the level-1 of
HL-LHC. We construct over 20 timing based variables, and identify two of them
which have better performances and are robust against increasing PU. We
estimate the QCD prompt jet background rates accurately using the "stitching"
procedure...
Resistive Plate Chamber detectors are largely used in current High Energy Physics experiments given their excellent resolution in time and high resolution in space. They are typically operated in avalanche mode with large fractions of Tetrafluoroethane (C2H2F4), a gas recently banned by the European Union due to its high Global Warming Potential (GWP).
An intense R&D activity is ongoing to...
Precision luminosity measurements are an essential ingredient to cross section measurements at the LHC and its high-luminosity upgrade (HL-LHC), needed to determine fundamental parameters of the standard model and to constrain or discover beyond-the-standard-model phenomena. The luminosity measurement of the CMS detector at the LHC, using proton-proton collisions at 13 TeV during the 2015–2018...
Recent results on exotic resonances obtained from the proton-proton collision data taken by the ATLAS experiment will be presented. A study of J/psi p resonances in the Lambda_b -> J/psi p K decays with large m(pK) invariant masses will be reported. Studies of Z_c states in B-meson decays with the Run 2 data at 13 TeV will be discussed. Searches for exotic resonances in 4 muon final states...
We report on the search for visible decays of exotic mediators from data taken in "beam-dump" mode with the NA62 experiment. The NA62 experiment can be run as a "beam-dump experiment" by removing the Kaon production target and moving the upstream collimators into a "closed" position.
In 2021, more than 10^17 protons on target have been collected in this way during a week-long data-taking...
We will present preliminary COMPASS results on the Deeply Virtual Compton Scattering (DVCS) cross section, which was obtained from exclusive single-photon production by scattering the 160 GeV muon beams of the SPS M2 beamline off a 2.5 m long liquid hydrogen target. The recoil proton was measured by a barrel-shaped time-of-flight detector surrounding the target. The scattered muons were...
The Jiangmen Underground Neutrino Observatory (JUNO) is a medium-baseline reactor neutrino experiment currently under construction in southern China. $20\,\mathrm{kton}$ LAB-based liquid scintillator target is contained inside the Central Detector, a $35.4\,\mathrm{m}$ diameter spherical acrylic vessel. The scintillator light emitted from the Central Detector will be read out by the...
Results of the ATLAS experiment on the exotic hadrons are presented. Studies of pentaquark and tetraquark states in B-hadron decays and recent results on the signals of resonant $J/\psi$-pair production are reviewed. Perspectives for future and ongoing analyses of exotic states are highlighted.
The low-energy QCD, the theory within the Standard Model describing the strong interaction, is still missing fundamental experimental results in order to achieve a breakthrough in its understanding. Among these experimental results, the low-energy kaon-nucleon/nuclei interaction studies are playing a key-role, with important consequences going from particle and nuclear physics to astrophysics...
Open heavy flavor production at RHIC
The Super-Kamiokande (SK) experiment is a 50 kton water Cherenkov detector located in the Kamioka Observatory in Japan and in operation since 1996, observing neutrinos and anti-neutrinos from many different sources. In 2020, SK moved to the SK-Gd phase, in which gadolinium sulfate octahydrate was added to the water in the detector to improve the detection efficiency of neutrons. Such neutrons...
The search for new physics such as supersymmetry (SUSY) and other beyond-the-standard-model physics is a major goal of the LHC physics program. The talk will cover the most recent results of SUSY searches using 137 fb$^{-1}$ data collected in 2016-2018 with the CMS detector at the LHC.
We study one of the important signature of quark gluon plasma (QGP) that is electromagnetic probes. The electromagnetic probes as diphotons are considered as a best signals for the formation and evolution of QGP.
We investigated diphoton production rate using a phenomenological model with quasiparticle approach at higher temperatures above critical temperature. In this, we use effective quark...
Thermal production of Exotic states and antistates as well as
different scenarios of microscopic production of exotic states are considered for pp and A+A collisions at RHIC and LHC energies.
Sexaquark production in heavy ion collisions
