V. M. Ghete
A5073746799- 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
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Distributed and Parallel Computing Systems
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Advanced Data Storage Technologies
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Superconducting and THz Device Technology
- Parallel Computing and Optimization Techniques
- Nuclear reactor physics and engineering
- Radiation Therapy and Dosimetry
- Advanced X-ray and CT Imaging
- Electron and X-Ray Spectroscopy Techniques
- Gaussian Processes and Bayesian Inference
- Superconducting Materials and Applications
- Advanced Thermodynamic Systems and Engines
Institute of High Energy Physics
2015-2024
Austrian Academy of Sciences
2007-2023
Universität Innsbruck
1998-2022
European Organization for Nuclear Research
2004-2014
University of Genoa
2003
Imperial College London
1998
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...
The Compact Muon Solenoid (CMS) detector is described. operates at the Large Hadron Collider (LHC) CERN. It was conceived to study proton-proton (and lead-lead) collisions a centre-of-mass energy of 14 TeV (5.5 nucleon-nucleon) and luminosities up 1034 cm−2 s−1 (1027 s−1). At core CMS sits high-magnetic-field large-bore superconducting solenoid surrounding an all-silicon pixel strip tracker, lead-tungstate scintillating-crystals electromagnetic calorimeter, brass-scintillator sampling hadron...
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.
Properties of the Higgs boson with mass near 125 $$\,\text {GeV}$$ are measured in proton-proton collisions CMS experiment at LHC. Comprehensive sets production and decay measurements combined. The channels include $$\gamma \gamma $$ , $$\mathrm{Z}\mathrm{Z}$$ $$\mathrm{W}\mathrm{W}$$ $$\tau \tau $$\mathrm{b} \mathrm{b} $$\mu \mu pairs. data samples were collected 2011 2012 correspond to integrated luminosities up 5.1 {fb}^\text {-1}$$ 7 {TeV}$$ 19.7 8 . From high-resolution channels, is...
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...
A detailed description is reported of the analysis used by CMS Collaboration in search for standard model Higgs boson pp collisions at LHC, which led to observation a new boson. The data sample corresponds integrated luminosities up 5.1 inverse femtobarns sqrt(s) = 7 TeV, and 5.3 8 TeV. results five decay modes gamma gamma, ZZ, WW, tau tau, bb, show combined local significance 5 deviations near 125 GeV, are reviewed. fit invariant mass two high resolution channels, ZZ 4 ell, gives estimate...
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...
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.
Results are presented from a search for particle dark matter (DM), extra dimensions, and unparticles using events containing jet an imbalance in transverse momentum. The data were collected by the CMS detector proton-proton collisions at LHC correspond to integrated luminosity of 19.7 inverse femtobarns centre-of-mass energy 8 TeV. number observed is found be consistent with standard model prediction. Limits placed on DM-nucleon scattering cross section as function DM mass spin-dependent...
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...
Results are presented from a search for the rare decays ${B}_{s}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ and ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ in $pp$ collisions at $\sqrt{s}=7$ 8 TeV, with data samples corresponding to integrated luminosities of 5 $20\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, respectively, collected by CMS experiment LHC. An unbinned maximum-likelihood fit dimuon...
A bstract search for the standard model Higgs boson decaying to a W-boson pair at LHC is reported. The event sample corresponds an integrated luminosity of 4.9 fb −1 and 19.4 collected with CMS detector in pp collisions $ \sqrt{s} = 7 8 TeV, respectively. candidates are selected events two or three charged leptons. An excess above background observed, consistent expectation from mass around 125 GeV. probability observe equal larger than one seen, under background-only hypothesis,...
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).
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...
This paper presents a search for the pair production of top squarks in events with single isolated electron or muon, jets, large missing transverse momentum, and mass. The data sample corresponds to an integrated luminosity 19.5 inverse femtobarns pp collisions collected 2012 by CMS experiment at LHC center-of-mass energy sqrt(s) = 8 TeV. No significant excess is observed above expectation from standard model processes. results are interpreted context supersymmetric models that decay either...
Searches for the direct electroweak production of supersymmetric charginos, neutralinos, and sleptons in a variety signatures with leptons $$\mathrm{W}$$ , $$\mathrm{Z}$$ Higgs bosons are presented. Results based on sample proton-proton collision data collected at center-of-mass energy $$\sqrt{s}=8\,\mathrm{TeV}$$ CMS detector 2012, corresponding to an integrated luminosity 19.5 $$\,\text {fb}^\text {-1}$$ . The observed event rates agreement expectations from standard model. These results...
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 search for the standard model Higgs boson ($H$) decaying to $b\overline{b}$ when produced in association with a weak vector ($V$) is reported following channels: $W(\ensuremath{\mu}\ensuremath{\nu})H$, $W(e\ensuremath{\nu})H$, $W(\ensuremath{\tau}\ensuremath{\nu})H$, $Z(\ensuremath{\mu}\ensuremath{\mu})H$, $Z(ee)H$, and $Z(\ensuremath{\nu}\ensuremath{\nu})H$. The performed data samples corresponding integrated luminosities of up 5.1 inverse femtobarns at $\sqrt{s}=7\text{ }\text{...
The first direct search for lepton-flavour-violating decays of the recently discovered Higgs boson (H) is described. performed in H to mu tau[e] and tau[h] channels, where are tau leptons reconstructed electronic hadronic decay respectively. data sample used this was collected pp collisions at a centre-of-mass energy sqrt(s) = 8 TeV with CMS experiment CERN LHC corresponds an integrated luminosity 19.7 inverse femtobarns. sensitivity order magnitude better than existing indirect limits. A...
The normalized differential cross section for top quark pair (tt-bar) production is measured in pp collisions at a centre-of-mass energy of 8 TeV the CERN LHC using CMS detector data corresponding to an integrated luminosity 19.7 inverse femtobarns. measurements are performed lepton + jets (e/mu jets) and dilepton (e+e-, mu+mu-, e+-mu-+) decay channels. tt-bar as function kinematic properties charged leptons, associated b quarks, system. compared with several predictions from perturbative...
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 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...