L. Forthomme
A5114377055- 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
- Computational Physics and Python Applications
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Distributed and Parallel Computing Systems
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Nuclear reactor physics and engineering
- Radiation Therapy and Dosimetry
- Nuclear physics research studies
- Gamma-ray bursts and supernovae
- Laser-Plasma Interactions and Diagnostics
- Stochastic processes and financial applications
- International Science and Diplomacy
- Noncommutative and Quantum Gravity Theories
- Superconducting Materials and Applications
- Advanced X-ray and CT Imaging
AGH University of Krakow
2024-2025
European Organization for Nuclear Research
2012-2025
Jagiellonian University
2025
Institute of High Energy Physics
2014-2024
A. Alikhanyan National Laboratory
2022-2024
University of Antwerp
2024
University of Helsinki
2019-2023
National Taiwan University
2022-2023
Paul Scherrer Institute
2023
UCLouvain
2011-2022
At the Large Hadron Collider, identification of jets originating from b quarks is important for searches new physics and measurements standard model processes. A variety algorithms has been developed by CMS to select b-quark based on variables such as impact parameters charged-particle tracks, properties reconstructed decay vertices, presence or absence a lepton, combinations thereof. The performance these measured using data proton-proton collisions at LHC compared with expectations...
Dijet production in PbPb collisions at a nucleon–nucleon center-of-mass energy of 2.76 TeV is studied with the CMS detector LHC. A data sample corresponding to an integrated luminosity 150 μb−1 analyzed. Jets are reconstructed using combined information from tracking and calorimetry, anti-kT algorithm R=0.3. The dijet momentum balance angular correlations as function collision centrality leading jet transverse momentum. For most peripheral collisions, good agreement distributions pp...
A bstract measurement of the single-top-quark t -channel production cross section in pp collisions at $ \sqrt{s}=7 TeV with CMS detector LHC is presented. Two different and complementary approaches have been followed. The first approach exploits distributions pseudorapidity recoil jet reconstructed top-quark mass using background estimates determined from control samples data. second based on multivariate analysis techniques that probe compatibility candidate events signal. Data collected...
Measurements of inclusive jet and dijet production cross sections are presented. Data from LHC proton-proton collisions at √s=7 TeV, corresponding to 5.0 fb−1 integrated luminosity, have been collected with the CMS detector. Jets reconstructed up rapidity 2.5, transverse momentum 2 invariant mass 5 using anti-kT clustering algorithm distance parameter R=0.7. The measured corrected for detector effects compared perturbative QCD predictions next-to-leading order, five sets parton distribution...
Measurements of the normalized rapidity ($y$) and transverse-momentum (${q}_{\mathrm{T}}$) distributions Drell--Yan muon electron pairs in $Z$-boson mass region ($60<{M}_{\ensuremath{\ell}\ensuremath{\ell}}<120\text{ }\text{ }\mathrm{GeV}$) are reported. The results obtained using a data sample proton-proton collisions at center-of-mass energy 7 TeV, collected by CMS experiment Large Hadron Collider (LHC), corresponding to an integrated luminosity $36\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$....
The results of searches for supersymmetry by the CMS experiment are interpreted in framework simplified models. based on data corresponding to an integrated luminosity 4.73 4.98 fb−1. were collected at LHC proton–proton collisions a center-of-mass energy 7 TeV. This paper describes method interpretation and provides upper limits product production cross section branching fraction as function new particle masses number These experimental acceptance calculations can be used constrain other...
The polarizations of the $\ensuremath{\Upsilon}(1S)$, $\ensuremath{\Upsilon}(2S)$, and $\ensuremath{\Upsilon}(3S)$ mesons are measured in proton-proton collisions at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$, using a data sample $\ensuremath{\Upsilon}(nS)\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ decays collected by CMS experiment, corresponding to an integrated luminosity $4.9\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. dimuon decay angular distributions...
A multivariate likelihood method to measure electroweak couplings with the Drell-Yan process at LHC is presented. The described by dilepton rapidity, invariant mass, and decay angle distributions. ambiguity due unknown assignment of scattered constituent quark antiquark two protons in a collision resolved statistically using correlations between observables. applied sample dimuon events from proton-proton collisions sqrt(s) = 7 TeV collected CMS experiment LHC, corresponding an integrated...
The results of a search for the pair production fourth-generation up-type quark (t') in proton-proton collisions at sqrt(s) = 7 TeV are presented, using data corresponding to an integrated luminosity about 5.0 inverse femtobarns collected by Compact Muon Solenoid experiment LHC. t' is assumed decay exclusively W boson and b quark. Events with single isolated electron or muon, missing transverse momentum, least four hadronic jets, which one must be identified as jet, selected. No significant...
Results are presented from a search for heavy, right-handed muon neutrinos, ${N}_{\ensuremath{\mu}}$, and ${W}_{R}$ bosons, which arise in the left-right symmetric extensions of standard model. The analysis is based on $5.0\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ sample proton-proton collisions at center-of-mass energy 7 TeV, collected by CMS detector Large Hadron Collider. No evidence observed an excess events over model expectation. For models with exact symmetry, heavy neutrinos...
Results are reported of a search for deviation in the jet production cross section from prediction perturbative quantum chromodynamics at next-to-leading order. The is conducted using 7 TeV proton-proton data sample corresponding to an integrated luminosity $5.0\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, collected with Compact Muon Solenoid detector Large Hadron Collider. A could arise interactions characterized by mass scale $\ensuremath{\Lambda}$ too high be probed directly LHC. Such...
We present a formalism which uses fluxes of equivalent photons including transverse momenta the intermediate photons. The reminds familiar $k_t$-factorization approach used, e.g., to study two-photon production $c\bar{c}$ or $b\bar{b}$ pairs. results new method are compared with those obtained using code LPAIR, and good agreement is obtained. inclusion photon necessary in studies correlation observables. distributions for dimuon invariant mass, momentum muon pair relative azimuthal angle...
In this paper, a search for supersymmetry (SUSY) is presented in events with two opposite-sign isolated leptons the final state, accompanied by hadronic jets and missing transverse energy. An artificial neural network employed to discriminate possible SUSY signals from standard model background. The analysis uses data sample collected CMS detector during 2011 LHC run, corresponding an integrated luminosity of 4.98 inverse femtobarns proton-proton collisions at center-of-mass energy 7 TeV....
We calculate the cross section for $p p \to W^{+} W^-$ in recently developed $k_{\rm T}$-factorisation approach, including transverse momenta of virtual photons. focus on processes with single and double proton dissociation. First we discuss gap survival parton level as due to emission extra jet. Both role valence sea contributions is discussed. The hadronisation remnants performed {PYTHIA 8} string fragmentation model, assuming a simple quark-diquark model proton. Highly excited remnant...
A bstract We discuss the production of $$ t\overline{t} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> quark-antiquark pairs in proton-proton collisions via γγ fusion mechanism. include topologies which both protons stay intact or one even them undergo dissociation. The calculations are performed within k T -factorisation approach, including transverse momenta intermediate photons. Photon fluxes associated...
Abstract The TOTEM collaboration at the CERN LHC has measured differential cross-section of elastic proton–proton scattering $$\sqrt{s} = 8\,\mathrm{TeV}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>8</mml:mn> <mml:mspace /> <mml:mi>TeV</mml:mi> </mml:mrow> </mml:math> in squared four-momentum transfer range $$0.2\,\mathrm{GeV^{2}}< |t| < 1.9\,\mathrm{GeV^{2}}$$ <mml:mn>0.2</mml:mn>...
The degradation of signal in silicon sensors is studied under conditions expected at the CERN High-Luminosity LHC. 200 μm thick n-type are irradiated with protons different energies to fluences up 3 · 1015 neq/cm2. Pulsed red laser light a wavelength 672 nm used generate electron-hole pairs sensors. induced signals determine charge collection efficiencies separately for electrons and holes drifting through sensor. effective trapping rates extracted by comparing results simulation. electric...