A5042813409- 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
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Cosmology and Gravitation Theories
- Muon and positron interactions and applications
- Medical Imaging Techniques and Applications
- Advanced NMR Techniques and Applications
- NMR spectroscopy and applications
- Black Holes and Theoretical Physics
- Advanced MRI Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Big Data Technologies and Applications
- Relativity and Gravitational Theory
- Arctic and Russian Policy Studies
- Social and Behavioral Studies
- Neutrino Physics Research
- Language, Communication, and Linguistic Studies
- CCD and CMOS Imaging Sensors
- Bacteriophages and microbial interactions
- Hungarian Social, Economic and Educational Studies
- Higher Education Governance and Development
UCLouvain
2007-2024
National Research University Higher School of Economics
2019
Université Claude Bernard Lyon 1
2011
The version 3.0 of the Delphes fast-simulation is presented. goal to allow simulation a multipurpose detector for phenomenological studies. includes track propagation system embedded in magnetic field, electromagnetic and hadron calorimeters, muon identification system. Physics objects that can be used data analysis are then reconstructed from simulated response. These include tracks calorimeter deposits high level such as isolated electrons, jets, taus, missing energy. new modular approach...
CMS is a general purpose experiment, designed to study the physics of pp collisions at 14 TeV Large Hadron Collider (LHC). It currently involves more than 2000 physicists from 150 institutes and 37 countries. The LHC will provide extraordinary opportunities for particle based on its unprecedented collision energy luminosity when it begins operation in 2007.
Results on two-particle angular correlations for charged particles emitted in proton-proton collisions at center-of-mass energies of 0.9, 2.36, and 7 TeV are presented, using data collected with the CMS detector over a broad range pseudorapidity (eta) azimuthal angle (phi). Short-range Delta(eta), which studied minimum bias events, characterized simple "independent cluster" parametrization order to quantify their strength (cluster size) extent eta decay width). Long-range differentially as...
Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$ are measured with the inner tracking system of CMS detector LHC. The charged-hadron yield is obtained by counting number reconstructed hits, hit pairs, fully charged-particle tracks. combination three methods gives a multiplicity per unit...
This report presents the capabilities of CMS experiment to explore rich heavy-ion physics programme offered by CERN Large Hadron Collider (LHC). The collisions lead nuclei at energies , will probe quark and gluon matter unprecedented values energy density. prime goal this research is study fundamental theory strong interaction — Quantum Chromodynamics (QCD) in extreme conditions temperature, density parton momentum fraction (low-x).
Measurements of inclusive charged-hadron transverse-momentum and pseudorapidity distributions are presented for proton-proton collisions at $\sqrt{s} = 0.9 $ 2.36 TeV. The data were collected with the CMS detector during LHC commissioning in December 2009. For non-single-diffractive interactions, average transverse momentum is measured to be 0.46 ± 0.01 (stat.) (syst.) GeV/c TeV 0.50 TeV, pseudorapidities between --2.4 +2.4. At these energies, densities central region, dN ch/dη||η|<0.5, 3:48...
Measurements of inclusive W and Z boson production cross sections in pp collisions at $ \sqrt {s} = 7 TeV are presented, based on 2.9 pb−1 data recorded by the CMS detector LHC. The measurements, performed electron muon decay channels, combined to give \sigma \left( {{\text{pp}} \to {\text{W}}X} \right) \times \mathcal{B}\left( {{\text{W}} \ell \nu } 9.95\pm 0.07\left( {{\text{stat}}{.}} \right)\pm 0.28\left( {{\text{syst}}{.}} 1.09 (lumi.) nb {\text{Z}}X} {Z {\ell^{+} }{\ell^{-} }} 0.931\pm...
The spectra of strange hadrons are measured in proton-proton collisions, recorded by the CMS experiment at CERN LHC, centre-of-mass energies 0.9 and 7 TeV. K^0_s, Lambda, Xi^- particles their antiparticles reconstructed from decay topologies production rates as functions rapidity transverse momentum. results compared to other experiments predictions PYTHIA Monte Carlo program. momentum distributions found differ substantially exceed up a factor three.
The production of J/ψ mesons is studied in pp collisions at $\sqrt{s} = 7$ TeV with the CMS experiment LHC. measurement based on a dimuon sample corresponding to an integrated luminosity 314 nb−1. differential cross section determined, as function transverse momentum, three rapidity ranges. A fit decay length distribution used separate prompt from non-prompt (b hadron J/ψ) component. Integrated over momentum 6.5 30 GeV/c and range |y|<2.4, measured sections, times branching fraction, are...
Measurements of primary charged hadron multiplicity distributions are presented for non-single-diffractive events in proton-proton collisions at centre-of-mass energies $ \sqrt {s} = 0.9 , 2.36, and 7 TeV, five pseudorapidity ranges from |η| < 0.5 to 2.4. The data were collected with the minimum-bias trigger CMS experiment during LHC commissioning runs 2009 TeV run 2010. distribution 0.9\;{\text{TeV}} is agreement previous measurements. At higher increase mean underestimated by most event...
A search for narrow resonances in the dijet mass spectrum is performed using data corresponding to an integrated luminosity of $2.9\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ collected by CMS experiment at Large Hadron Collider. Upper limits 95% confidence level are presented on product resonance cross section, branching fraction into dijets, and acceptance, separately decays quark-quark, quark-gluon, or gluon-gluon pairs. The exclude new particles predicted following models level:...
The first measurement of the cross section for top-quark pair production in pp collisions at LHC center-of-mass energy sqrt(s)= 7 TeV has been performed using 3.1 {\pm} 0.3 inverse pb data recorded by CMS detector. This result utilizes final state with two isolated, highly energetic charged leptons, large missing transverse energy, and or more jets. Backgrounds from Drell-Yan non-W/Z boson are estimated data. Eleven events observed 2.1 1.0 expected background. measured is 194 72 (stat.) 24...
Measurements of the total and differential cross sections $d\ensuremath{\sigma}/d{p}_{T}^{B}$ $d\ensuremath{\sigma}/d{y}^{B}$ for ${B}^{+}$ mesons produced in $pp$ collisions at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$ are presented. The data correspond to an integrated luminosity $5.8\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ collected by CMS experiment operating LHC. exclusive decay ${B}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{+}$, with...
A search for microscopic black hole production and decay in pp collisions at a center-of-mass energy of 7 TeV has been conducted by the CMS Collaboration LHC, using data sample corresponding to an integrated luminosity 35 pb−1. Events with large total transverse are analyzed presence multiple high-energy jets, leptons, photons, typical signal expected from hole. Good agreement standard model backgrounds, dominated QCD multijet production, is observed various final-state multiplicities...
The differential cross section for the inclusive production of isolated prompt photons has been measured as a function photon transverse energy ${E}_{T}^{\ensuremath{\gamma}}$ in $pp$ collisions at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$ using data recorded by CMS detector LHC. sample corresponds to an integrated luminosity $2.9\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$. Photons are required have pseudorapidity $|{\ensuremath{\eta}}^{\ensuremath{\gamma}}|<1.45$ and...
Measurements of dijet azimuthal decorrelations in $pp$ collisions at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$ using the CMS detector CERN LHC are presented. The analysis is based on an inclusive event sample corresponding to integrated luminosity $2.9\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$. results compared predictions from perturbative QCD calculations and various Monte Carlo generators. distributions found be sensitive initial-state gluon radiation.
Dijet angular distributions are measured over a wide range of dijet invariant masses in $pp$ collisions at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$, the CERN LHC. The event sample, recorded with CMS detector, corresponds to an integrated luminosity $36\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$. data found be good agreement predictions perturbative QCD, and yield no evidence quark compositeness. With modified frequentist approach, lower limit on contact interaction scale for left-handed quarks...
A measurement of the underlying activity in scattering processes with transverse momentum scale GeV region is performed proton-proton collisions at sqrt(s) = 0.9 TeV, using data collected by CMS experiment LHC. Charged hadron production studied reference to direction a leading object, either charged particle or set particles forming jet. Predictions several QCD-inspired models as implemented PYTHIA are compared, after full detector simulation, data. The generally predict too little hadrons...
The result of a search at the LHC for heavy stable charged particles produced in pp collisions $ \sqrt {s} = 7\;{\text{TeV}} is described. data sample was collected with CMS detector and corresponds to an integrated luminosity 3.1 pb−1. Momentum ionization-energy-loss measurements inner tracker are used identify tracks compatible slow-moving particles. Additionally, passing muon identification requirements also analyzed same signature. In each case, no candidate passes selection, expected...
A measurement of the angular correlations between beauty and anti-beauty hadrons ( $ {\text{B}}\overline {\text{B}} ) produced in pp collisions at a centre-of-mass energy 7 TeV CERN LHC is presented, probing for first time region small separation. The B are identified by presence displaced secondary vertices from their decays. hadron separation reconstructed decay primary-interaction vertex. differential production cross section, measured data sample collected CMS corresponding to an...
Bose-Einstein correlations have been measured using samples of proton-proton collisions at 0.9 and 2.36 TeV center-of-mass energies, recorded by the CMS experiment CERN Large Hadron Collider. The signal is observed in form an enhancement pairs same-sign charged particles with small relative four-momentum. size correlated particle emission region seen to increase significantly multiplicity event.
Hadronic event shapes have been measured in proton-proton collisions at sqrt(s)=7 TeV, with a data sample collected the CMS detector LHC. The corresponds to an integrated luminosity of 3.2 inverse picobarns. Event-shape distributions, corrected for response, are compared five models QCD multijet production.
The results of the first search for long-lived gluinos produced in 7 TeV $pp$ collisions at CERN Large Hadron Collider are presented. looks evidence particles that stop CMS detector and decay quiescent periods between beam crossings. In a dataset with peak instantaneous luminosity $1\ifmmode\times\else\texttimes\fi{}{10}^{32}\text{ }\text{ }{\mathrm{cm}}^{\ensuremath{-}2}\text{ }{\mathrm{s}}^{\ensuremath{-}1}$, an integrated $10\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$, interval corresponding...