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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

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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

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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

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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

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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

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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

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2018-08-16
07:02
Analysis of the radiation hardness and charge collection efficiency of thinned silicon diodes / Boscardin, M (ITC-IRST, Trento) ; Bruzzi, M (INFN, Florence ; Florence U.) ; Candelori, A (INFN, Padua) ; Dalla Betta, G -F (U. Trento (main)) ; Focardi, E (INFN, Florence ; Florence U.) ; Khomenkov, V (INFN, Padua) ; Piemonte, C (ITC-IRST, Trento) ; Ronchin, S (ITC-IRST, Trento) ; Tosi, C (U. Florence (main)) ; Zorzi, N (ITC-IRST, Trento)
Due to their low depletion voltage, even after high particle fluences, improved tracking precision and momentum resolution and reduced material budget, thin substrates are one of the possible choices to provide radiation hard detectors for future high energy physics experiments. [...]
2004. - 4 p.

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2018-08-16
07:02
Second-order generation of point defects in gamma-irradiated float-zone silicon, an explanation for “type inversion” / Pintilie, I (Bucharest, Nat. Inst. Mat. Sci.) ; Fretwurst, E (Hamburg U., Inst. Exp. Phys. II) ; Lindström, G (Hamburg U., Inst. Exp. Phys. II) ; Stahl, J (Hamburg U., Inst. Exp. Phys. II)
Radiation-induced defects in silicon diodes were investigated after exposure to high doses of $\rm{Co}^{60}$-gamma irradiation using the thermally stimulated current method. [...]
2003. - 3 p.

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2018-08-16
04:25
Searches for new heavy quarks in ATLAS / Nikiforou, Nikiforos
A search for new heavy quarks focusing on recent vector-like quark searches with the ATLAS detector at the CERN Large Hadron Collider is presented. [...]
arXiv:1808.04695. -
Full text

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2018-08-16
04:25
The Sudakov radiator for jet observables and the soft physical coupling / Banfi, Andrea (Sussex U.) ; El-Menoufi, Basem Kamal (Sussex U.) ; Monni, Pier Francesco (CERN)
We present a procedure to calculate the Sudakov radiator for a generic recursive infrared and collinear (rIRC) safe observable in two-scale problems. [...]
arXiv:1807.11487. - 33 p.
Fulltext

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