# CMS Conference Reports

Nyeste elementer:
2018-08-16
10:41
 Evidence for light-by-light scattering in ultraperipheral PbPb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV / d'Enterria, David (CERN) /CMS Collaboration Evidence for light-by-light (LbL) scattering, $\gamma\gamma\to\gamma\gamma$, in ultraperipheral PbPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV is reported. LbL scattering processes are selected in events with just two photons produced, with transverse energy $E_T^{\gamma}>2$ GeV, pseudorapidity $\mid\eta^{\gamma}\mid<2.4$; and diphoton invariant mass $m^{\gamma\gamma}>5$~GeV, transverse momentum $p_{T}^{\gamma\gamma} <1$~GeV, and acoplanarity $(1-\Delta \phi^{\gamma\gamma}/\pi)<0.01$. [...] CMS-CR-2018-159.- Geneva : CERN, 2018 - 5 p. Fulltext: PDF; In : The 27th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Venice, Italy, 13 - 19 May 2018

2018-08-16
10:41
 Rare decays at CMS / Piedra Gomez, Jonatan (Cantabria Inst. of Phys.) /CMS Collaboration Searches for flavour changing neutral currents (FCNC) in events with top quarks and the Z or the Higgs boson are presented by the CMS Collaboration. These searches use proton-proton collision events taken by the CMS experiment at the Large Hadron Collider (LHC), built by the European Organization for Nuclear Research (CERN). Upper limits at $95\%$ confidence level are set on the branching fractions of ${\rm t \to qZ}$ and ${\rm t \to qH}$ decays. [...] CMS-CR-2018-157.- Geneva : CERN, 2018 - 8 p. Fulltext: PDF; In : XIV International Conference on Heavy Quarks and Leptons , Yamagata, Japan, 27 May - 1 Jun 2018

2018-08-16
10:40
 Precision Timing Calorimetry with the upgraded CMS Crystal ECAL / Ciriolo, Vincenzo (INFN, Milan Bicocca ; Milan Bicocca U.) /CMS Collaboration Particle detectors with a timing resolution of order 10 ps can improve event reconstruction at high luminosity hadron colliders tremendously. The upgrade of the Compact Muon Solenoid (CMS) crystal electromagnetic calorimeter (ECAL), which will operate at the High Luminosity Large Hadron Collider (HL-LHC), will achieve a timing resolution of around 30 ps for high energy photons and electrons. [...] CMS-CR-2018-145.- Geneva : CERN, 2018 - 9 p. Fulltext: PDF; In : 18th International Conference on Calorimetry in Particle Physics, Eugene, Usa, 21 - 25 May 2018

2018-08-16
10:40
 Observation of $\mathrm{t}\overline{\mathrm{t}}\mathrm{H}$ production at CMS / Salerno, Daniel Nicholas (Zurich U.) /CMS Collaboration The observation of Higgs boson production in association with a top quark-antiquark pair is reported, based on a combined analysis of proton-proton collision data at center-of-mass energies of $\sqrt{s}=7$, 8 and 13 TeV, corresponding to integrated luminosities of up to 5.1, 19.7, and 35.9 fb${}^{-1}$, respectively. The data were collected with the CMS detector at the CERN LHC. [...] CMS-CR-2018-138.- Geneva : CERN, 2018 - 5 p. Fulltext: PDF; In : 30th Rencontres de Blois Particle Physics and Cosmology, Blois, France, 3 - 8 Jun 2018

2018-08-16
10:39
 Longevity studies for the CMS-RPC system / Gelmi, Andrea (INFN, Bari ; Bari U.) /CMS Collaboration In the next decades, the Large Hadron Collider (LHC) will run at very high luminosity (HL-LHC) 5$\times10^{34}$ cm$^{-2}$s$^{-1}$, factor five more than the nominal LHC luminosity. During this period the CMS RPC system will be subjected to high background rates which could affect the performance by inducing aging effects. [...] CMS-CR-2018-136.- Geneva : CERN, 2018 - 9 p. Fulltext: PDF; In : RPC 2018 - THE XIV WORKSHOP ON RESISTIVE PLATE CHAMBERS AND RELATED DETECTORS, Puerto Vallarta, Mexico, 19 - 23 Feb 2018

2018-08-16
10:38
 First measurements of top quark properties with Run-2 data in CMS / Chen, Kai-Feng (Taiwan, Natl. Taiwan U.) /CMS Collaboration Measurements of top quark properties using data collected by the CMS experiment at 13 TeV are presented. The top quark mass is measured in the lepton+jets channel is consistent with the CMS measurements of Run-1. [...] CMS-CR-2018-116.- Geneva : CERN, 2018 - 8 p. Fulltext: PDF; In : XXVI International Workshop on Deep Inelastic Scattering and Related Subjects, Kobe, Hyogo, Japan, 16 - 20 Apr 2018

2018-08-03
15:07
 RPC Radiation Background Simulations for the High Luminosity Phase in the CMS Experiment / Carpinteyro, Bernardino (Puebla U., Inst. Fis.) /CMS Collaboration The high luminosity expected from the HL-LHC will be a challenge for the CMS detector. The increased rate of particles coming from the collisions and the radioactivity induced in the detector material could cause significant damage and result in a progressive degradation of its performance. [...] CMS-CR-2018-144.- Geneva : CERN, 2018 - 8 p. Fulltext: PDF; In : RPC 2018 - THE XIV WORKSHOP ON RESISTIVE PLATE CHAMBERS AND RELATED DETECTORS, Puerto Vallarta, Mexico, 19 - 23 Feb 2018

2018-08-03
15:07
 CMS RPC efficiency measurement using the tag-and-probe method / Goh, Junghwan (Hanyang U.) /CMS Collaboration We measure the efficiency of CMS Resistive Plate Chamber (RPC) detectors in proton-proton collisions at the centre-of-mass energy of 13 TeV~using the tag-and-probe method. A muon from a $Z^0$ boson decay is selected as a probe of efficiency measurement, reconstructed using the CMS inner tracker and the rest of CMS muon systems. [...] CMS-CR-2018-131.- Geneva : CERN, 2018 - 7 p. Fulltext: PDF; In : RPC 2018 - THE XIV WORKSHOP ON RESISTIVE PLATE CHAMBERS AND RELATED DETECTORS, Puerto Vallarta, Mexico, 19 - 23 Feb 2018

2018-08-02
09:03
 The Higgs boson at the LHC: standard model Higgs properties and beyond standard model searches / Magnan, Anne-marie (Imperial Coll., London) /ATLAS and CMS Collaborations After the discovery of a new particle in 2012 by the ATLAS and CMS collaborations, since then identified to be the standard model Higgs boson, a brief review is made of recent results using LHC data taken at a centre-of-mass energy of 13 TeV in 2016. The SM Higgs boson properties continue to be studied with greater precision, and all production modes and decay channels are probed, including the production in association with top quark, whose $5\sigma$ observation is made possible by the data accumulated so far. [...] CMS-CR-2018-108.- Geneva : CERN, 2018 - 11 p. Fulltext: PDF; In : an Alpine LHC Physics Summit, Obergurgl, Austria, 15 - 20 Apr 2018

2018-07-31
13:56
 New method of out-of-time energy subtraction for the CMS hadronic calorimeter / Lawhorn, Jay Mathew (Caltech) /CMS Collaboration The CMS hadronic calorimeter employs plastic scintillator active material in the barrel and endcap (HBHE). In Run 2, the LHC operates at 13 TeV center of mass energy with up to 50 simultaneous collisions per bunch crossing (pileup) and a 25 ns bunch spacing. [...] CMS-CR-2018-140.- Geneva : CERN, 2018 - 7 p. Fulltext: PDF; In : 18th International Conference on Calorimetry in Particle Physics, Eugene, Usa, 21 - 25 May 2018