A5010326962- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Medical Imaging Techniques and Applications
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Gamma-ray bursts and supernovae
- Atomic and Subatomic Physics Research
- International Science and Diplomacy
- Radio Frequency Integrated Circuit Design
- Stochastic processes and financial applications
- Radiation Detection and Scintillator Technologies
- Radiation Therapy and Dosimetry
- Nuclear reactor physics and engineering
- Radioactivity and Radon Measurements
- Laser-Plasma Interactions and Diagnostics
- Scientific Computing and Data Management
- Superconducting and THz Device Technology
Centro Brasileiro de Pesquisas Físicas
2016-2025
A. Alikhanyan National Laboratory
2022-2024
Institute of High Energy Physics
2017-2024
University of Antwerp
2024
Institute of Nuclear Physics of Lyon
2019
University of Göttingen
2009-2014
European Organization for Nuclear Research
2011
University of Bonn
2008-2009
University of Kansas
2003-2008
Universität Hamburg
2002-2003
In July 2012, the ATLAS and CMS collaborations at CERN Large Hadron Collider announced observation of a Higgs boson mass around 125 gigaelectronvolts. Ten years later, with data corresponding to production 30-times larger number bosons, we have learnt much more about properties boson. The experiment has observed in numerous fermionic bosonic decay channels, established its spin-parity quantum numbers, determined measured cross-sections various modes. Here Collaboration reports most...
The measurement of the luminosity recorded by CMS detector installed at LHC interaction point 5, using proton-proton collisions s=13TeV in 2015 and 2016, is reported. absolute scale measured for individual bunch crossings beam-separation scans (the van der Meer method), with a relative precision 1.3 1.0% respectively. dominant sources uncertainty are related to residual differences between beam positions ones provided operational settings magnets, factorizability proton spatial density...
Abstract The performance is presented of the reconstruction and identification algorithms for electrons photons with CMS experiment at LHC. reported results are based on proton-proton collision data collected a center-of-mass energy 13 TeV recorded in 2016–2018, corresponding to an integrated luminosity 136 fb^-1. Results obtained from lead-lead √(s NN )=5.02 also presented. Innovative techniques used reconstruct electron photon signals detector optimize resolution. Events final state...
With increasing instantaneous luminosity at the LHC come additional reconstruction challenges. At high luminosity, many collisions occur simultaneously within one proton-proton bunch crossing. The isolation of an interesting collision from "pileup" is needed for effective physics performance. In CMS Collaboration, several techniques capable mitigating impact these pileup have been developed. Such methods include charged-hadron subtraction, jet identification, isospin-based neutral particle...
A measurement of the mass Higgs boson in diphoton decay channel is presented. This analysis based on 35.9 fb$^{-1}$ proton-proton collision data collected during 2016 LHC running period, with CMS detector at a center-of-mass energy 13 TeV. refined calibration and new techniques have been used to improve precision this measurement. The measured be $m_\mathrm{H} =$ 125.78 $\pm$ 0.26 GeV. combined $m_\mathrm{H}$ already performed H $\to$ ZZ 4$\ell$ using same set, giving 125.46 0.16 result,...
Measurements are presented of the Bs0→μ+μ− branching fraction and effective lifetime, as well results a search for B0→μ+μ− decay in proton-proton collisions at s=13TeV LHC. The analysis is based on data collected with CMS detector 2016–2018 corresponding to an integrated luminosity 140fb−1. Bs0 meson lifetime most precise single measurements date. No evidence has been found. All found be consistent standard model predictions previous measurements.
A search is reported for near-threshold structures in the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>J</a:mi><a:mo>/</a:mo><a:mi>ψ</a:mi><a:mi>J</a:mi><a:mo>/</a:mo><a:mi>ψ</a:mi></a:mrow></a:math> invariant mass spectrum produced proton-proton collisions at <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mrow><c:msqrt><c:mrow><c:mi>s</c:mi></c:mrow></c:msqrt><c:mo>=</c:mo><c:mn>13</c:mn><c:mtext> </c:mtext><c:mtext>...
Abstract This paper describes the Combine software package used for statistical analyses by CMS Collaboration. The package, originally designed to perform searches a Higgs boson and combined analysis of those searches, has evolved become tool presently in majority measurements performed It is not specific experiment, this intended serve as reference users outside Collaboration, providing an outline most salient features capabilities. Readers are provided with possibility run reproduce...
A search for narrow and broad resonances with masses greater than 1.8 TeV decaying to a pair of jets is presented. The uses proton-proton collision data at $\sqrt{s} =$ 13 collected the LHC, corresponding an integrated luminosity 137 fb$^{-1}$. background arising from standard model processes predicted fit method used in previous publications new method. dijet invariant mass spectrum well described by both data-driven methods, no significant evidence production particles observed. Model...
A bstract We perform global fits to the parameters of Constrained Minimal Super-symmetric Standard Model (CMSSM) and a variant with non-universal Higgs masses (NUHM1). In addition constraints from low-energy precision observables cosmological dark matter density, we take into account LHC exclusions searches in jets plus missing transverse energy signatures about 5 fb −1 integrated luminosity. also include most recent upper bound on branching ratio B s → μμ LHCb. Furthermore, implications for...
A search is presented for a narrow resonance decaying to pair of oppositely charged muons using $\sqrt{s}=13\text{ }\text{ }\mathrm{TeV}$ proton-proton collision data recorded at the LHC. In 45--75 and 110--200 GeV mass ranges, based on conventional triggering event reconstruction techniques. 11.5--45 range, uses collected with dimuon triggers low transverse momentum thresholds, high rate by storing reduced amount trigger-level information. The correspond integrated luminosities 137...
A search is presented for long-lived charged particles that decay within the volume of silicon tracker CMS experiment. Such can produce events with an isolated track missing hits in outermost layers tracker, and also associated little energy deposited calorimeters no muon detectors. The this "disappearing track" signature performed a sample proton-proton collisions recorded by experiment at LHC center-of-mass 13 TeV, corresponding to integrated luminosity 101 fb$^{-1}$ 2017 2018. observation...
A search is presented for new particles produced at the LHC in proton-proton collisions $\sqrt{s} =$ 13 TeV, using events with energetic jets and large missing transverse momentum. The analysis based on a data sample corresponding to an integrated luminosity of 101 fb$^{-1}$, collected 2017-2018 CMS detector. Machine learning techniques are used define separate categories narrow from initial-state radiation large-radius consistent hadronic decay W or Z boson. statistical combination made...
A bstract search for nonresonant production of Higgs boson pairs via gluon-gluon and vector fusion processes in final states with two bottom quarks photons is presented. The uses data from proton-proton collisions at a center-of-mass energy $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV recorded the CMS detector LHC, corresponding to an integrated luminosity 137 fb − 1 . No significant deviation...
Abstract A new algorithm is presented to discriminate reconstructed hadronic decays of tau leptons ( τ h ) that originate from genuine in the CMS detector against candidates quark or gluon jets, electrons, muons. The inputs information all particles vicinity a candidate and employs deep neural network with convolutional layers efficiently process inputs. This leads significantly improved performance compared previously used one. For example, efficiency for pass discriminator jets increases...
A bstract search for heavy neutral leptons (HNLs), the right-handed Dirac or Majorana neutrinos, is performed in final states with three charged (electrons muons) using proton-proton collision data collected by CMS experiment at $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV CERN LHC. The correspond to an integrated luminosity of 138 fb − 1 . HNLs could be produced through mixing standard model neutrinos...
This Letter presents a search for direct production of charginos and neutralinos via electroweak interactions. The results are based on data from proton-proton collisions at center-of-mass energy 13 TeV collected with the CMS detector LHC, corresponding to an integrated luminosity 137 fb$^{-1}$. considers final states large missing transverse momentum pairs hadronically decaying bosons WW, WZ, WH, where H is Higgs boson. These identified using novel algorithms. No significant excess events...
Since the initial data taking of CERN LHC, CMS experiment has undergone substantial upgrades and improvements. This paper discusses detector as it is configured for third data-taking period Run 3, which started in 2022. The entire silicon pixel tracking was replaced. A new powering system superconducting solenoid installed. electronics hadron calorimeter upgraded. All muon electronic systems were upgraded, stations added, including a gas electron multiplier detector. precision proton...
Decays of $Z$ bosons to charm quark-antiquark pairs have been observed for the first time at a hadron collider, as part search decays Higgs pairs, which are bounded 14 times standard model value.
A search for decays to invisible particles of Higgs bosons produced in association with a top-antitop quark pair or vector boson, which both decay fully hadronic final state, has been performed using proton-proton collision data collected at s=13TeV by the CMS experiment LHC, corresponding an integrated luminosity 138fb-1. The 95% confidence level upper limit set on branching fraction 125GeV boson particles, B(H→inv), is 0.54 (0.39 expected), assuming standard model production cross...
Abstract A test of lepton flavor universality in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msup> <mml:mtext>B</mml:mtext> <mml:mo>±</mml:mo> </mml:mrow> </mml:msup> <mml:mo accent="false" stretchy="false">→</mml:mo> <mml:mtext>K</mml:mtext> <mml:mi>μ</mml:mi> <mml:mo>+</mml:mo> <mml:mo>−</mml:mo> </mml:math> and <mml:mtext>e</mml:mtext> decays, as well a measurement differential integrated branching fractions nonresonant decay are presented....
Energy correlators that describe energy-weighted distances between two or three particles in a hadronic jet are measured using an event sample of sqrt[s]=13 TeV proton-proton collisions collected by the CMS experiment and corresponding to integrated luminosity 36.3 fb^{-1}. The distributions consistent with trends simulation reveal key features strong interaction: confinement asymptotic freedom. By comparing ratio three- two-particle energy correlator theoretical calculations resum collinear...
A bstract The first collider search for dark matter arising from a strongly coupled hidden sector is presented and uses data sample corresponding to 138 fb −1 , collected with the CMS detector at CERN LHC, $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV. hypothesized couple standard model (SM) via heavy leptophobic Z′ mediator produced as resonance in proton-proton collisions. decay results two...
The first measurement of the CP structure Yukawa coupling between Higgs boson and $\tau$ leptons is presented. based on data collected in proton-proton collisions at $\sqrt{s} =$ 13 TeV by CMS detector LHC, corresponding to an integrated luminosity 137 fb$^{-1}$. analysis uses angular correlation decay planes produced decays. effective mixing angle CP-even CP-odd couplings found be $-$1 $\pm$ 19$^\circ$, compared expected value 0 21$^\circ$ 68.3% confidence level. disfavour pure scenario 3.0...