R. Gonzalez Suarez
A5106331204- 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
- Distributed and Parallel Computing Systems
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Simulation Techniques and Applications
- Mathematics, Computing, and Information Processing
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Superconducting Materials and Applications
- Advanced Data Storage Technologies
- Scientific Computing and Data Management
- Particle accelerators and beam dynamics
- Gamma-ray bursts and supernovae
- Radiation Therapy and Dosimetry
- Big Data Technologies and Applications
Uppsala University
2019-2025
University of California, Santa Cruz
2023-2024
Université Savoie Mont Blanc
2021-2024
Institut National de Physique Nucléaire et de Physique des Particules
2021-2024
Institute for High Energy Physics
2023-2024
Institute of Science and Technology
2023-2024
University of Geneva
2023-2024
Atlas Scientific (United States)
2024
A. Alikhanyan National Laboratory
2014-2024
SR Research (Canada)
2024
Results are presented from searches for the standard model Higgs boson in proton-proton collisions at sqrt(s) = 7 and 8 TeV Compact Muon Solenoid experiment LHC, using data samples corresponding to integrated luminosities of up 5.1 inverse femtobarns 5.3 TeV. The search is performed five decay modes: gamma gamma, ZZ, WW, tau tau, b b-bar. An excess events observed above expected background, with a local significance 5.0 deviations, mass near 125 GeV, signalling production new particle. that...
Combined results are reported from searches for the standard model Higgs boson in proton-proton collisions at sqrt(s)=7 TeV five decay modes: gamma pair, b-quark tau lepton W and Z pair. The explored mass range is 110-600 GeV. analysed data correspond to an integrated luminosity of 4.6-4.8 inverse femtobarns. expected excluded absence 118-543 GeV 95% CL. observed exclude 127-600 CL, 129-525 99% An excess events above background low end making limits weaker than a signal. largest excess, with...
Jet production in PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV was studied with the CMS detector LHC, using data sample corresponding to an integrated luminosity 6.7 inverse microbarns. Jets are reconstructed deposited calorimeters and as function collision centrality. With increasing centrality, striking imbalance dijet transverse momentum is observed, consistent jet quenching. The observed effect extends from lower cut-off used this study (jet = 120 GeV/c) up...
Results on two-particle angular correlations for charged particles emitted in pPb collisions at a nucleon–nucleon center-of-mass energy of 5.02 TeV are presented. The analysis uses two million collected with the CMS detector LHC. studied over broad range pseudorapidity, η, and full azimuth, ϕ, as function particle multiplicity transverse momentum, pT. In high-multiplicity events, long-range (2<|Δη|<4), near-side (Δϕ≈0) structure emerges Δη–Δϕ correlation functions. This is first observation...
Measurements of the jet energy calibration and transverse momentum resolution in CMS are presented, performed with a data sample collected proton-proton collisions at centre-of-mass 7TeV, corresponding to an integrated luminosity 36pb−1. The balance dijet γ/Z+jets events is used measure response detector, as well resolution. results presented for three different methods reconstruct jets: calorimeter-based approach, ``Jet-Plus-Track'' which improves measurement calorimeter jets by exploiting...
The performance of muon reconstruction, identification, and triggering in CMS has been studied using 40 inverse picobarns data collected pp collisions at sqrt(s) = 7 TeV the LHC 2010. A few benchmark sets selection criteria covering a wide range physics analysis needs have examined. For all considered selections, efficiency to reconstruct identify with transverse momentum pT larger than GeV is above 95% over whole region pseudorapidity covered by system, abs(eta) < 2.4, while probability...
The transverse momentum spectra of charged particles have been measured in pp and PbPb collisions at $\sqrt{s_{NN}}=2.76~\mathrm{TeV}$ by the CMS experiment LHC. In range p T=5–10 GeV/c, particle yield most central is suppressed up to a factor 7 compared scaled number incoherent nucleon–nucleon collisions. At higher T, this suppression significantly reduced, approaching roughly 2 for with T T=40–100 GeV/c.
A study is presented of the mass and spin-parity new boson recently observed at LHC a near 125 GeV. An integrated luminosity 17.3 fb(-1), collected by CMS experiment in proton-proton collisions center-of-mass energies 7 8 TeV, used. The measured ZZ channel, where both Z bosons decay to e or μ pairs, 126.2 ± 0.6(stat) 0.2(syst) angular distributions lepton pairs this channel are sensitive boson. Under assumption spin 0, present data consistent with pure scalar hypothesis, while disfavoring...
A measurement of inclusive W and Z production cross sections in pp collisions at $ \sqrt {s} = 7 TeV is presented. The electron muon decay channels are analyzed a data sample collected with the CMS detector LHC corresponding to an integrated luminosity 36 pb−1. measured σ(pp → WX) × \mathcal{B}\left( {{\text{W}} \to \ell \nu } \right) 10.31 ± 0.02 (stat.) 0.09 (syst.) 0.10 (th.) 0.41 (lumi.) nb ZX) {{\text{Z}} {\ell^{+} }{\ell^{-} }} 0.974 0.007 0.018 0.039 nb, limited dilepton invariant...
The suppression of the individual Upsilon(nS) states in PbPb collisions with respect to their yields pp data has been measured. and sets used analysis correspond integrated luminosities 150 inverse microbarns 230 nanobarns, respectively, collected 2011 by CMS experiment at LHC, a center-of-mass energy per nucleon pair 2.76 TeV. are measured from dimuon invariant mass spectra. relative scaled number nucleon-nucleon collisions, R[AA], is as function collision centrality. Integrated over...
A search for events with jets and missing transverse energy is performed in a data sample of $pp$ collisions collected at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$ by the CMS experiment LHC. The analyzed corresponds to an integrated luminosity $1.14\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. In this search, kinematic variable ${\ensuremath{\alpha}}_{\mathrm{T}}$ used as main discriminator between genuine misreconstructed energy. No excess over standard model expectation found. Exclusion limits...
A bstract Yields of prompt and non-prompt J/ ψ , as well $ \Upsilon (1S) mesons, are measured by the CMS experiment via their μ + − decays in PbPb pp collisions at \sqrt {{{s_{\text{NN}}}}} = 2.76 TeV for quarkonium rapidity | y < 2.4. Differential cross sections nuclear modification factors reported functions transverse momentum p T collision centrality. For with relatively high (6.5 30 GeV/ c ), a strong, centrality-dependent suppression is observed collisions, compared to yield scaled...
The anisotropy of the azimuthal distributions charged particles produced in $\sqrt{{s}_{NN}}=2.76$ TeV PbPb collisions is studied with CMS experiment at LHC. elliptic parameter, ${v}_{2}$, defined as second coefficient a Fourier expansion particle invariant yields, extracted using event-plane method, two- and four-particle cumulants, Lee-Yang zeros. presented function transverse momentum (${p}_{\mathrm{T}}$), pseudorapidity ($\ensuremath{\eta}$) over broad kinematic range,...
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...
Results from the first study of isolated-photon + jet correlations in relativistic heavy ion collisions are reported. The analysis uses data PbPb at a centre-of-mass energy 2.76TeV per nucleon pair corresponding to an integrated luminosity 150μb−1 recorded by CMS experiment LHC. For events containing isolated photon with transverse momentum pTγ>60GeV/c and associated pTJet>30GeV/c, pT imbalance is studied as function collision centrality compared pp pythia calculations same energy. Using pTγ...
A bstract search has been made for events containing an energetic jet and imbalance in transverse momentum using a data sample of pp collisions at center-of-mass energy 7 TeV. This signature is common to both dark matter extra dimensions models. The were collected by the CMS detector LHC correspond integrated luminosity 5.0 fb −1 . number observed consistent with standard model expectation. Constraints on matter-nucleon scattering cross sections are determined spin-independent spin-dependent...
A search for a Higgs boson decaying into two photons is described. The analysis performed using dataset recorded by the CMS experiment at LHC from pp collisions centre-of-mass energy of 7 TeV, which corresponds to an integrated luminosity 4.8 inverse femtobarns. Limits are set on cross section standard model photons. expected exclusion limit 95% confidence level between 1.4 and 2.4 times in mass range 110 150 GeV. data excludes, level, 128 132 largest excess events above background observed...
Abstract The existence of nonzero neutrino masses points to the likely multiple Standard Model neutral fermions. When such states are heavy enough that they cannot be produced in oscillations, referred as leptons (HNLs). In this white paper, we discuss present experimental status HNLs including colliders, beta decay, accelerators, well astrophysical and cosmological impacts. We importance continuing search for HNLs, its potential impact on our understanding key fundamental questions,...
A search for supersymmetry with R-parity conservation in proton–proton collisions at a centre-of-mass energy of 7 TeV is presented. The data correspond to an integrated luminosity 35pb−1 collected by the CMS experiment LHC. performed events jets and significant missing transverse energy, characteristic decays heavy, pair-produced squarks gluinos. primary background, from standard model multijet production, reduced several orders magnitude negligible level application set robust kinematic...
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.
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...
A search for neutral Higgs bosons decaying to tau pairs at a center-of-mass energy of 7 TeV is performed using dataset corresponding an integrated luminosity 4.6 inverse femtobarns recorded by the CMS experiment LHC. The sensitive both standard model boson and predicted minimal supersymmetric extension (MSSM). No excess events observed in tau-pair invariant-mass spectrum. For mass range 110-145 GeV upper limits 95% confidence level (CL) on production cross section are determined. We exclude...
A comparison of the relative yields Υ resonances in μ(+)μ(-) decay channel Pb-Pb and pp collisions at a center-of-mass energy per nucleon pair 2.76 TeV is performed with data collected CMS detector LHC. Using muons transverse momentum above 4 GeV/c pseudorapidity below 2.4, double ratio Υ(2S) Υ(3S) excited states to Υ(1S) ground state collisions, [Υ(2S+3S)/Υ(1S)](Pb-Pb)/[Υ(2S+3S)/Υ(1S)](pp), found be 0.31(-0.15)(+0.19)(stat)±0.03(syst). The probability obtain measured value, or lower, if...
Isolated photon production is measured in proton–proton and lead–lead collisions at nucleon–nucleon centre-of-mass energies of 2.76 TeV the pseudorapidity range |η|<1.44 transverse ET between 20 80 GeV with CMS detector LHC. The spectra are found to be good agreement next-to-leading-order perturbative QCD predictions. ratio PbPb pp isolated ET-differential yields, scaled by number incoherent collisions, consistent unity for all reaction centralities.