A5022554865- 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
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Nuclear physics research studies
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Distributed and Parallel Computing Systems
- Radiation Therapy and Dosimetry
- Nuclear reactor physics and engineering
- Gamma-ray bursts and supernovae
- Stochastic processes and statistical mechanics
- Advanced NMR Techniques and Applications
- Astronomical and nuclear sciences
Université Libre de Bruxelles
2019-2023
A. Alikhanyan National Laboratory
2022-2023
European Organization for Nuclear Research
2014-2023
Institute of High Energy Physics
2022-2023
Ghent University Hospital
2023
Institute of Nuclear Physics of Lyon
2016-2022
Institut National de Physique Nucléaire et de Physique des Particules
2016-2022
UCLouvain
2013-2022
Petersburg Nuclear Physics Institute
1995-2022
Centre National de la Recherche Scientifique
2016-2022
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...
At the start of Run 2 in 2015, LHC delivered proton-proton collisions at a center-of-mass energy 13 TeV. During (years 2015-2018) eventually reached luminosity 2.1 $\times$ 10$^{34}$ cm$^{-2}$ s$^{-1}$, almost three times that during 1 (2009-2013) and factor two larger than design value, leading to events with up mean about 50 simultaneous inelastic per bunch crossing (pileup). The CMS Level-1 trigger was upgraded prior 2016 improve selection physics challenging conditions posed by second...
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...
Results are reported from a search for supersymmetric particles in the final state with multiple jets and large missing transverse momentum. The uses sample of proton-proton collisions at $\sqrt{s} =$ 13 TeV collected CMS detector 2016-2018, corresponding to an integrated luminosity 137 fb$^{-1}$, representing essentially full LHC Run 2 data sample. analysis is performed four-dimensional region defined terms number jets, tagged bottom quark scalar sum jet momenta, magnitude vector momenta....
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...
Evidence for Higgs boson decay to a pair of muons is presented. This result combines searches in four exclusive categories targeting the production via gluon fusion, vector association with boson, and top quark-antiquark pair. The analysis performed using proton-proton collision data at $\sqrt{s} =$ 13 TeV, corresponding an integrated luminosity 137 fb$^{-1}$, recorded by CMS experiment CERN LHC. An excess events over background expectation observed significance 3.0 standard deviations,...
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,...
A bstract search is presented for physics beyond the standard model (SM) using electron or muon pairs with high invariant mass. data set of proton-proton collisions collected by CMS experiment at 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 from 2016 to 2018 corresponding a total integrated luminosity up 140 fb − 1 analyzed. No significant deviation observed respect SM background expectations. Upper...
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...
Machine-learning (ML) techniques are explored to identify and classify hadronic decays of highly Lorentz-boosted W/Z/Higgs bosons top quarks. Techniques without ML have also been evaluated included for comparison. The identification performances a variety algorithms characterized in simulated events directly compared with data. validated using proton-proton collision data at √s = 13TeV, corresponding an integrated luminosity 35.9 fb−1. Systematic uncertainties assessed by comparing the...
The standard model (SM) production of four top quarks ( tt¯tt¯ ) in proton-proton collisions is studied by the CMS Collaboration. data sample, collected during 2016-2018 taking LHC, corresponds to an integrated luminosity 137 fb-1 at a center-of-mass energy 13 TeV . events are required contain two same-sign charged leptons (electrons or muons) least three leptons, and jets. observed expected significances for signal respectively 2.6 2.7 deviations, cross section measured be 12.6-5.2+5.8fb...
Abstract Two related searches for phenomena beyond the standard model (BSM) are performed using events with hadronic jets and significant transverse momentum imbalance. The results based on a sample of proton–proton collisions at center-of-mass energy $$13\,\text {Te}\text {V} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>13</mml:mn><mml:mspace/><mml:mrow><mml:mtext>Te</mml:mtext><mml:mspace/></mml:mrow></mml:mrow></mml:math> , collected by CMS experiment LHC...
Signals consistent with the B_{c}^{+}(2S) and B_{c}^{*+}(2S) states are observed in proton-proton collisions at sqrt[s]=13 TeV, an event sample corresponding to integrated luminosity of 143 fb^{-1}, collected by CMS experiment during 2015-2018 LHC running periods. These excited b[over ¯]c B_{c}^{+}π^{+}π^{-} invariant mass spectrum, ground state B_{c}^{+} reconstructed through its decay J/ψπ^{+}. The two as well-resolved peaks, separated 29.1±1.5(stat)±0.7(syst) MeV. observation rather than...
Normalised multi-differential cross sections for top quark pair ($\mathrm{t\overline{t}}$) production are measured in proton-proton collisions at a centre-of-mass energy of 13 TeV using events containing two oppositely charged leptons. The analysed data were recorded with the CMS detector 2016 and correspond to an integrated luminosity 35.9 fb$^{-1}$. double-differential $\mathrm{t\overline{t}}$ section is as function kinematic properties system parton level full phase space. A...
A bstract search for phenomena beyond the standard model in final states with two oppositely charged same-flavor leptons and missing transverse momentum is presented. The uses a data sample of proton-proton collisions at $$ \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, corresponding to an integrated luminosity 137 fb − 1 , collected by CMS experiment LHC. Three potential signatures physics are explored: excess...
Measurements of the differential cross section for Drell-Yan process, based on proton-proton collision data at a centre-of-mass energy 13 TeV, collected by CMS experiment, are presented. The correspond to an integrated luminosity 2.8 (2.3) fb$^{-1}$ in dimuon (dielectron) channel. total and fiducial measurements presented as function dilepton invariant mass range 15 3000 GeV, compared with perturbative predictions standard model. measured sections good agreement theoretical calculations.
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...
The CMS detector at the CERN LHC features a silicon pixel as its innermost subdetector. original has been replaced with an upgraded system (CMS Phase-1 detector) in extended year-end technical stop of 2016/2017. is designed to cope higher instantaneous luminosities that have achieved by after upgrades accelerator during first long shutdown 2013–2014. Compared detector, better tracking performance and lower mass four barrel layers three endcap disks on each side provide hit coverage up...
Measurements of the top quark polarization and pair ($t\overline{t}$) spin correlations are presented using events containing two oppositely charged leptons (${e}^{+}{e}^{\ensuremath{-}}$, ${e}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\mu}}^{\ensuremath{\mp}}$, or ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$) produced in proton-proton collisions at a center-of-mass energy 13 TeV. The data were recorded by CMS experiment LHC 2016 correspond to an integrated luminosity...
A bstract Results are reported for the $$ {\mathrm{B}}_{\mathrm{s}}^0 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> → μ + − branching fraction and effective lifetime from a search decay B 0 . The analysis uses data sample of proton-proton collisions accumulated by CMS experiment in 2011, 2012, 2016, with center-of-mass energies (integrated luminosities) 7 TeV (5 fb 1 ), 8 (20 13 (36...
A search is presented for long-lived charged particles that decay within the volume of silicon tracker CMS experiment. Such can produce events with an isolated track missing hits in outermost layers tracker, and also associated little energy deposited calorimeters no muon detectors. The this "disappearing track" signature performed a sample proton-proton collisions recorded by experiment at LHC center-of-mass 13 TeV, corresponding to integrated luminosity 101 fb$^{-1}$ 2017 2018. observation...
Measurements of production cross sections WZ and same-sign WW boson pairs in association with two jets proton-proton collisions at s=13TeV the LHC are reported. The data sample corresponds to an integrated luminosity 137fb−1, collected CMS detector during 2016–2018. measurements performed leptonic decay modes , where ℓ,ℓ′=e, . Differential fiducial as functions invariant masses jet charged lepton pairs, well leading-lepton transverse momentum, measured for W±W± consistent standard model...
A bstract Measurements of Higgs boson production cross sections and couplings in events where the decays into a pair photons are reported. Events selected from sample proton-proton collisions at $$ \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 collected by CMS detector LHC 2016 to 2018, corresponding an integrated luminosity 137 fb − 1 . Analysis categories enriched produced via gluon fusion, vector...
The results of two searches for pair production vector-like T or B quarks in fully hadronic final states are presented, using data from the CMS experiment at a center-of-mass energy 13 TeV. were collected LHC during 2016 and correspond to an integrated luminosity 35.9 fb$^{-1}$. A cut-based analysis specifically targets bW decay mode quark allows reconstruction candidates. In second analysis, multiclassification algorithm, "boosted event shape tagger," is deployed label candidate jets as...
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...