S. Costantini
A5107835667- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Distributed and Parallel Computing Systems
- Superconducting Materials and Applications
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Nuclear reactor physics and engineering
- Advanced Vision and Imaging
- Laser-Plasma Interactions and Diagnostics
- Plant responses to water stress
- X-ray Spectroscopy and Fluorescence Analysis
- Stochastic processes and statistical mechanics
- Scientific Measurement and Uncertainty Evaluation
Ghent University Hospital
2010-2022
European Organization for Nuclear Research
2011-2020
Institute of High Energy Physics
2010-2017
Ghent University
2011-2015
Centro Brasileiro de Pesquisas Físicas
2012
University of Basel
2000-2011
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
1994-2011
Sapienza University of Rome
1994-2007
Kyungpook National University
2006
Tata Institute of Fundamental Research
1998-2005
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...
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 properties of a Higgs boson candidate are measured in the $H\ensuremath{\rightarrow}ZZ\ensuremath{\rightarrow}4\ensuremath{\ell}$ decay channel, with $\ensuremath{\ell}=e$, $\ensuremath{\mu}$, using data from $pp$ collisions corresponding to an integrated luminosity $5.1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ at center-of-mass energy $\sqrt{s}=7\text{ }\mathrm{TeV}$ and $19.7\text{ }{\mathrm{fb}}^{\ensuremath{-}\text{1}}$ $\sqrt{s}=8\text{ }\mathrm{TeV}$, recorded CMS detector...
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.
Observation of the diphoton decay mode recently discovered Higgs boson and measurement some its properties are reported. The analysis uses entire dataset collected by CMS experiment in proton-proton collisions during 2011 2012 LHC running periods. data samples correspond to integrated luminosities 5.1[Formula: see text]at [Formula: text] 19.7[Formula: 8[Formula: . A clear signal is observed channel at a mass close 125[Formula: with local significance text], where expected for standard model...
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...
The study of the spin-parity and tensor structure interactions recently discovered Higgs boson is performed using H to ZZ, Z gamma*, gamma* 4 l, WW l nu nu, gamma decay modes. full dataset recorded by CMS experiment during LHC Run 1 used, corresponding an integrated luminosity up 5.1 inverse femtobarns at a center-of-mass energy 7 TeV 19.7 8 TeV. A wide range spin-two models excluded 99% confidence level or higher, 99.87% for minimal gravity-like couplings, regardless whether assumptions are...
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 search for new physics is performed in multijet events with large missing transverse momentum produced proton-proton collisions at sqrt(s) = 8 TeV using a data sample corresponding to an integrated luminosity of 19.5 inverse femtobarns collected the CMS detector LHC. The divided into three jet multiplicity categories (3-5, 6-7, and or more jets), studied further bins two variables: scalar sum momenta momentum. observed numbers various are consistent backgrounds expected from standard model...
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...
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...
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...
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...
A search for a standard model Higgs boson decaying into pair of τ leptons is performed using events recorded by the CMS experiment at LHC in 2011 and 2012. The dataset corresponds to an integrated luminosity 4.9 fb−1 centre-of-mass energy 7 TeV 19.7 8 TeV. Each lepton decays hadronically or leptonically electron muon, leading six different final states -lepton pair, all considered this analysis. An excess observed over expected background contributions, with local significance larger than 3...
Results of searches for heavy stable charged particles produced in pp collisions at sqrt(s) = 7 and 8 TeV are presented corresponding to an integrated luminosity 5.0 inverse femtobarns 18.8 femtobarns, respectively. Data collected with the CMS detector used study momentum, energy deposition, time-of-flight signal candidates. Leptons electric charge between e/3 8e, as well bound states that can undergo exchange material, studied. Analysis results various combinations signatures inner tracker...
The second-order azimuthal anisotropy Fourier harmonics, v2, are obtained in p−Pb and PbPb collisions over a wide pseudorapidity (η) range based on correlations among six or more charged particles. p-Pb data, corresponding to an integrated luminosity of 35 nb−1, were collected during the 2013 LHC run at nucleon-nucleon center-of-mass energy 5.02 TeV by CMS experiment. A sample semiperipheral collision data √sNN=2.76 TeV, 2.5 μb−1 covering similar particle multiplicities as is also analyzed...
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...
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...