I. De Bruyn
A5105669594- 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
- Astrophysics and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Black Holes and Theoretical Physics
- Distributed and Parallel Computing Systems
- Radiation Detection and Scintillator Technologies
- Forensic and Genetic Research
- Particle Accelerators and Free-Electron Lasers
- Gamma-ray bursts and supernovae
- Nuclear reactor physics and engineering
- International Science and Diplomacy
- Optical properties and cooling technologies in crystalline materials
- Radiation Therapy and Dosimetry
- CCD and CMOS Imaging Sensors
- Atomic and Subatomic Physics Research
- Stochastic processes and financial applications
- advanced mathematical theories
- Molecular Biology Techniques and Applications
University of Wisconsin System
2024-2025
University of Wisconsin–Madison
2019-2025
Université Libre de Bruxelles
2024-2025
Institute of High Energy Physics
2016-2024
A. Alikhanyan National Laboratory
2022-2024
University of Antwerp
2009-2024
European Organization for Nuclear Research
2023
TU Wien
2023
Vrije Universiteit Brussel
2015-2022
Antwerp University Hospital
2006-2010
The CMS apparatus was identified, a few years before the start of LHC operation at CERN, to feature properties well suited particle-flow (PF) reconstruction: highly-segmented tracker, fine-grained electromagnetic calorimeter, hermetic hadron strong magnetic field, and an excellent muon spectrometer. A fully-fledged PF reconstruction algorithm tuned detector therefore developed has been consistently used in physics analyses for first time collider. For each collision, comprehensive list...
This paper describes the CMS trigger system and its performance during Run 1 of LHC. The consists two levels designed to select events potential physics interest from a GHz (MHz) interaction rate proton-proton (heavy ion) collisions. first level is implemented in hardware, selects containing detector signals consistent with an electron, photon, muon, τ lepton, jet, or missing transverse energy. A programmable menu up 128 object-based algorithms used for subsequent processing. thresholds are...
New sets of parameters (“tunes”) for the underlying-event (UE) modelling pythia8, pythia6 and herwig++ Monte Carlo event generators are constructed using different parton distribution functions. Combined fits to CMS UE proton–proton ( $$\mathrm {p}\mathrm {p}$$ ) data at $$\sqrt{s} = 7\,\text {TeV} $$ proton–antiproton {p}\overline{\mathrm{p}} from CDF experiment lower $$\sqrt{s}$$ , used study models constrain their parameters, providing thereby improved predictions collisions 13 $$\,\text...
Improved jet energy scale corrections, based on a data sample corresponding to an integrated luminosity of 19.7 inverse-femtobarns collected by the CMS experiment in proton-proton collisions at center-of-mass 8 TeV, are presented. The corrections as function pseudorapidity eta and transverse momentum pT extracted from simulated events combining several channels methods. They account successively for effects pileup, uniformity detector response, residual data-simulation differences. Further...
The CMS muon detector system, reconstruction software, and high-level trigger underwent significant changes in 2013-2014 preparation for running at higher LHC collision energy instantaneous luminosity. performance of the modified system is studied using proton-proton data center-of-mass $\sqrt{s}=$ 13 TeV, collected 2015 2016. measured parameters, including spatial resolution, efficiency, timing, are found to meet all design specifications well reproduced by simulation. Despite more...
Measurements of two- and multi-particle angular correlations in pp collisions at sqrt(s) = 5, 7, 13 TeV are presented as a function charged-particle multiplicity. The data, corresponding to integrated luminosities 1.0 inverse picobarn (5 TeV), 6.2 picobarns (7 0.7 (13 were collected using the CMS detector LHC. second-order (v[2]) third-order (v[3]) azimuthal anisotropy harmonics unidentified charged particles, well v[2] K0 short Lambda/anti-Lambda extracted from long-range two-particle...
A search for invisible decays of a Higgs boson is performed using proton-proton collision data collected with the CMS detector at LHC in 2016 center-of-mass energy , corresponding to an integrated luminosity 35.9. The targets production via vector fusion. are found be agreement background contributions from standard model processes. An observed (expected) upper limit 0.33 (0.25), 95% confidence level, placed on branching fraction decay particles, assuming rates and mass 125.09 GeV. Results...
A bstract Properties of the Higgs boson are measured in H → ZZ 4ℓ (ℓ = e, μ ) decay channel. data sample proton-proton collisions at $$ \sqrt{s}=13 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>13</mml:mn></mml:math> TeV, collected with CMS detector LHC and corresponding to an integrated luminosity 35.9 fb −1 is used. The signal strength modifier , defined as ratio observed rate channel standard model expectation,...
This document a outlines set of simplified models for dark matter and its interactions with Standard Model particles. It is intended to summarize the main characteristics that these have when applied searches at LHC, provide number useful expressions reference. The list includes both s-channel t-channel scenarios. For s-channel, spin-0 spin-1 mediations are discussed, also realizations where Higgs particle provides portal between visible sectors. guiding principles underpinning proposed...
A measurement of the coupling strength Higgs boson to a pair tau leptons is performed using events recorded in proton-proton collisions by CMS experiment at LHC 2016 center-of-mass energy 13 TeV. The data set corresponds an integrated luminosity 35.9 inverse femtobarns. H signal established with significance 4.9 standard deviations, be compared expected 4.7 deviations. best fit product observed production cross section and branching fraction 1.09 +0.27-0.26 times model expectation....
Results on two-particle angular correlations for charged particles produced in pp collisions at a center-of-mass energy of 13 TeV are presented. The data were taken with the CMS detector LHC and correspond to an integrated luminosity about 270 inverse nanobarns. studied over broad range pseudorapidity (abs(eta) < 2.4) full azimuth (phi) as function particle multiplicity transverse momentum (pt). In high-multiplicity events, long-range (abs(Delta eta) > 2.0), near-side (Delta phi...
A measurement of the inelastic proton-proton cross section with CMS detector at a center-of-mass energy $\sqrt{s} =$ 13 TeV is presented. The analysis based on events deposits in forward calorimeters, which cover pseudorapidities -6.6 $< \eta <$ -3.0 and +3.0 +5.2. An 68.6 $\pm$ 0.5 (syst) 1.6 (lumi) mb obtained for $M_\mathrm{X} >$ 4.1 GeV and/or $M_\mathrm{Y} GeV, where $M_\mathrm{X}$ $M_\mathrm{Y}$ are masses diffractive dissociation systems negative positive pseudorapidities,...
A systematic study of the factorization long-range azimuthal two-particle correlations into a product single-particle anisotropies is presented as function pt and eta both particles, particle multiplicity in PbPb pPb collisions. The data were taken with CMS detector for collisions at sqrt(s[NN]) = 2.76 TeV 5.02 TeV, covering very wide range multiplicity. Factorization observed to be broken eta. When measured particles different pt, magnitude breakdown second Fourier harmonic reaches 20%...
Searches for invisible decays of the Higgs boson are presented. The data collected with CMS detector at LHC correspond to integrated luminosities 5.1, 19.7, and 2.3 inverse femtobarns centre-of-mass energies 7, 8, 13 TeV, respectively. search channels target production via gluon fusion, vector in association a boson. Upper limits placed on branching fraction decay particles, as function assumed cross sections. combination all channels, assuming standard model production, yields an observed...
A new set of measurements the top quark mass are presented, based on proton-proton data recorded by CMS experiment at LHC $\sqrt{s}=8\text{ }\text{ }\mathrm{TeV}$ corresponding to a luminosity $19.7\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. The is measured using $\text{lepton}+\text{jets}$, all-jets and dilepton decay channels, giving values $172.35\ifmmode\pm\else\textpm\fi{}0.16(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.48(\mathrm{syst})\text{ }\mathrm{GeV}$,...
Angular distributions of the decay $\mathrm{B}^0 \to \mathrm{K}^{*0} \mu^+ \mu^-$ are studied using a sample proton-proton collisions at $\sqrt{s} = $ 8 TeV collected with CMS detector LHC, corresponding to an integrated luminosity 20.5 fb$^{-1}$. An angular analysis is performed determine $P_1$ and $P_5'$ parameters, where parameter particular interest because recent measurements that indicate potential discrepancy standard model predictions. Based on 1397 signal events, parameters...
Searches for resonances decaying into pairs of jets are performed using proton-proton collision data collected at $\sqrt{s} =$ 13 TeV corresponding to an integrated luminosity up 36 fb$^{-1}$. A low-mass search, with masses between 0.6 and 1.6 TeV, is based on events dijets reconstructed the trigger level from calorimeter information. high-mass above offline a particle-flow algorithm. The dijet mass spectrum well described by smooth parameterization no evidence production new particles...
The angular distributions and the differential branching fraction of decay B0 to K*0(892) mu are studied using data corresponding an integrated luminosity 20.5 inverse femtobarns collected with CMS detector at LHC in pp collisions sqrt(s) = 8 TeV. From 1430 signal decays, forward-backward asymmetry muons, longitudinal polarization fraction, determined as a function dimuon invariant mass squared. measurements among most precise date good agreement standard model predictions.
No signal of new particles has been found by the CMS collaboration from Run 2 LHC at 13 TeV. This null result tightens constraints on a variety models that predict existence heavy resonant states decay into pairs jets.
A search for a charged Higgs boson is performed with data sample corresponding to an integrated luminosity of 19.7 +/- 0.5 inverse femtobarns collected the CMS detector in proton-proton collisions at sqrt(s) = 8 TeV. The searched top quark decays m(H+/-) < m(t) - m(b), and direct production pp -> t (b) H+/- > m(b). tau+/- nu[tau] b decay modes final states tau[h]+jets, mu tau[h], l+jets, ll' (l e, mu) are considered search. No signal observed 95% confidence level upper limits set on...
A bstract Results are presented from a search for the direct electroweak production of charginos and neutralinos in signatures with either two or more leptons (electrons muons) same electric charge, three leptons, which can include up to hadronically decaying tau leptons. The results based on sample proton-proton collision data collected at $$ \sqrt{s}=13 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo>...
A search for new physics using events containing an imbalance in transverse momentum and one or more energetic jets arising from initial-state radiation the hadronic decay of $W$ $Z$ bosons is presented. data sample proton-proton collisions at $\sqrt{s}=13\text{ }\text{ }\mathrm{TeV}$, collected with CMS detector LHC corresponding to integrated luminosity $35.9\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, used. The observed are found be agreement expectation standard model processes. results...
Results are presented of a search for heavy particles decaying into two photons. The analysis is based on 19.7fb−1 sample proton–proton collisions at s=8TeV collected with the CMS detector CERN LHC. diphoton mass spectrum from 150 to 850GeV used an excess events over background. extended new resonances natural widths up 10% value. No evidence particle production observed and limits 95% confidence level cross section times branching fraction diphotons determined. These interpreted in terms...
A bstract search is presented for additional neutral Higgs bosons in the τ final state proton-proton collisions at LHC. The performed context of minimal supersymmetric extension standard model (MSSM), using data collected with CMS detector 2016 a center-of-mass energy 13 TeV, corresponding to an integrated luminosity 35.9 fb −1 . To enhance sensitivity MSSM bosons, includes production boson association b quarks. No significant deviation above expected background observed. Model-independent...