CERN Preprints

2014-09-15
11:59
 New Preshower detector for DIRAC Experiment / Pentia, M (Bucharest, IFIN-HH) ; Aogaki, S (Bucharest, IFIN-HH) ; Dumitriu, D (Bucharest, IFIN-HH) ; Fluerasu, D (Bucharest, IFIN-HH) ; Gugiu, M (Bucharest, IFIN-HH) ; Yazkov, V (SINP, Moscow) The Preshower detector together with the Cherenkov Nitrogen detector are used for electron-positron background rejection using amplitude information. [...] DIRAC-Note 2014-04. - 2014. - 14 p. Fulltext

2014-09-15
11:56
 On the permanent magnet in the run 2012 / Gorchakov, O DIRAC-Note 2014-03. - 2014. - 10 p. Fulltext

2014-09-15
11:47
 The $e^+ e^-$ and $π^+ π^-$ pair peak positions in the relative momentum components spectra / Dumitriu, U (Bucharest, IFIN-HH) One of the main problem in the metastable π+ π- bound states observation in the DIRAC Experiment is the separation of π+ and π- pairs produced in Be target and pairs, produced by breakdown metastable atoms in Pt foil . [...] DIRAC-Note 2014-02. - 2014. - 4 p. Fulltext

2014-09-15
11:28
 On GEANT-DIRAC multiple scattering in thin layers of DIRAC setup / Gorchakov, O In DIRAC setup there are a lot of thin materials such as cathodes, anodes, wires, strips and so on. [...] DIRAC-Note 2014-01. - 2014. - 3 p. Fulltext

2014-09-15
09:58
 Searches for heavy resonances at the LHC / Thomas, Laurent (Brussels U.) /ATLAS and CMS Collaborations We describe various searches for new resonant phenomena with the ATLAS and CMS detectors at the LHC, using the full dataset of proton-proton collisions recorded in 2012 at $\sqrt{s}$ = 8 TeV. The searches are based on the study of the invariant mass or visible invariant mass distribution of various pairs of physical objects such as jets, leptons, photons or heavy bosons. [...] CMS-CR-2014-202.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF; In : 26th Rencontres de Blois on Particle Physics and Cosmology, Blois, France, 18 - 23 May 2014

2014-09-15
09:58
 Searches for long lived exotic particles at the LHC / Tomalin, Ian (Rutherford) /ATLAS and CMS Collaborations I review recent results from searches for long-lived exotic particles at the LHC, examining how well we are exploring the theoretical phase space, and asking where we should strive to make improvements.. CMS-CR-2014-201.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF; In : 26th Rencontres de Blois on Particle Physics and Cosmology, Blois, France, 18 - 23 May 2014

2014-09-15
09:54
 The Matrix Element Method within CMS / Beluffi, Camille (Louvain U.) /CMS Collaboration The Matrix Element Method (MEM) is unique among the analysis methods used in experimental particle physics because of the direct link it establishes between theory and event reconstruction. This method was used to provide the most accurate measurement of the top mass at the Tevatron and since then it was used in the discovery of electroweak production of single top quarks. [...] CMS-CR-2014-212.- Geneva : CERN, 2014 - 7 p. Fulltext: PDF; In : 16th International workshop on Advanced Computing and Analysis Techniques in physics (ACAT), Prague, Czech Republic, 1 - 5 Sep 2014

2014-09-15
09:53
 Performance of e/gamma-based triggers at the CMS High Level Trigger / Demiragli, Zeynep (Brown U.) /CMS Collaboration The trigger systems of the LHC detectors play a crucial role in determining the physics capabilities of the experiments. A reduction of several orders of magnitude of the event rate is needed to reach values compatible with the detector readout, offline storage and analysis capabilities. [...] CMS-CR-2014-210.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF; In : 1st Large Hadron Collider Physics Conference, Barcelona, Spain, 13 - 18 May 2013

2014-09-15
09:53
 b-Jet Identification in CMS / Beluffi, Camille (Louvain U.) /CMS Collaboration A large fraction of the CMS physics program relies on the identification of jets containing the decay of a B hadron (b jets). The b jets can be discriminated from jets produced by the hadronization of light quarks based on characteristic properties of B hadrons, such as the long lifetime or the presence of soft leptons produced during their decay.An overview of the large variety of b-tagging algorithms and the measurement of their performance with data collected in 2011 and 2012 are presented in this talk. [...] CMS-CR-2014-192.- Geneva : CERN, 2014 - 4 p. Fulltext: PDF; In : 37th International Conference on High Energy Physics, 46015 Valencia, Spain, 2 - 9 Jul 2014

2014-09-15
09:52
 Hadronic Results from CMS Experiment at the LHC / Sunar Cerci, Deniz (Cukurova U.) /CMS Collaboration The Compact Muon Solenoid (CMS) is one of the two large multipurpose experiments at the LHC. We present the CMS results related to tests of QCD predictions for jet, dijet, and multijet production in pp collisions at center-of-mass energies of 7 TeV and 8 TeV. [...] CMS-CR-2014-183.- Geneva : CERN, 2014 - 4 p. Fulltext: PDF; In : IVth International Conference on Hadron Physics TROIA'14 , Canakkale, Turkey, 1 - 5 Jul 2014