# CERN Accelerating science

CMS Documentation in CDS
Conference Reports, Notes, Preprints, Thesis and Photos can be searched from the general CMS Collection page.

# CMS Conference Reports

2013-12-02
16:35
 Measurement of Jet Multiplicity Distributions in Semileptonic Top Quark Pair Events / Williamson, Shawn Darrell (Karlsruhe U., EKP) /CMS Collaboration The normalized differential cross section of $t\bar{t}$ events in the semileptonic decay channel in jet multiplicity bins is presented, measured in proton-proton collisions using $5.0\,\text{fb}^{-1}$ of data collected at $\sqrt{s} = 7\,\text{TeV}$. Additionally, the normalized differential cross-section of top quark pair production in bins of the number of radiated additional hard partons is measured. [...] CMS-CR-2013-440; CERN-CMS-CR-2013-440.- Geneva : CERN, 2013 - 7 p. Fulltext: PDF;

2013-12-02
16:34
 Operation and performance of the CMS tracker / Veszpremi, Viktor (Budapest, RMKI) /CMS Collaboration The CMS silicon tracker consists of two tracking devices utilizing semiconductor technology: the inner pixel and the outer strip detectors. They operate in a high-occupancy and high-radiation environment presented by particle collisions in the LHC. [...] CMS-CR-2013-437; CERN-CMS-CR-2013-437.- Geneva : CERN, 2013 - 12 p. Fulltext: PDF;

2013-12-02
16:34
 Evolution of the response of the CMS ECAL, and possible design options for electromagnetic calorimetry at the HL-LHC. / Martelli, Arabella (INFN, Milan Bicocca ; Milan Bicocca U.) /CMS Collaboration The performance of the CMS electromagnetic calorimeter (ECAL) has been continuously monitored at the LHC. The evolution of this performance is a critical issue for the future. [...] CMS-CR-2013-421; CERN-CMS-CR-2013-421.- Geneva : CERN, 2013 - 8 p. Fulltext: PDF;

2013-11-29
16:01
 The CMS Phase I pixel detector / Gray, Julia Ann (Kansas U.) /CMS Collaboration The CMS silicon pixel detector allows for precise track parameter measurements and vertex reconstruction. The current detector is designed to operate at a maximum luminosity of 1$\times$10$^{34}$ cm$^{-2}$ s$^{-1}$. [...] CMS-CR-2013-432; CERN-CMS-CR-2013-432.- Geneva : CERN, 2013 - 11 p. Fulltext: PDF;

2013-11-29
16:00
 The CMS ECAL performance with examples / Benaglia, Andrea (CERN) /CMS Collaboration The electromagnetic calorimeter of the CMS experiment at the CERN Large Hadron Collider is a hermetic, fine grained, homogeneous calorimeter containing 75848 lead tungstate crystals, completed by a silicon preshower installed in front of the endcaps. The main characteristics of the ECAL are reviewed. [...] CMS-CR-2013-430; CERN-CMS-CR-2013-430.- Geneva : CERN, 2013 - 13 p. Fulltext: PDF;

2013-11-29
16:00
 Sensor R\&D for the CMS Tracker Upgrade for the HL-LHC / Behnamian, Hadi (IPM, Tehran) /CMS Collaboration At an instantaneous luminosity of $5\times 10^{34} cm^{-2} s^{-1}$, the high-luminosity phase of the Large Hadron Collider (HL-LHC) is expected to deliver a total of 3000 $fb^{-1}$ of collisions, hereby increasing the discovery potential of the LHC experiments significantly. However, the radiation environment of the tracking system will be severe, requiring new radiation hard sensors for the CMS tracker. [...] CMS-CR-2013-425; CERN-CMS-CR-2013-425.- Geneva : CERN, 2013 - 13 p. Fulltext: PDF;

2013-11-29
16:00
 Flavor changing neutral currents in top production and decay / Yazgan, Efe (Gent U.) /ATLAS, CDF, CMS and D0 Collaborations Top quark flavor changing neutral current (FCNC) interactions are highly suppressed in the Standard Model. Therefore, any large signal of FCNCs will indicate the existence of new interactions. [...] CMS-CR-2013-398; CERN-CMS-CR-2013-398.- Geneva : CERN, 2013 - 11 p. Fulltext: PDF;

2013-11-26
16:43
 Measurement of the W polarization in t-tbar production in lepton+jets events / Olbrechts, Annik Maria (Vrije U., Brussels) /CMS Collaboration The W helicity fractions in top decays are measured with t-tbar events in the lepton+jets final state, using proton-proton collisions at a center-of-mass energy of 7 and 8 TeV, collected with the CMS detector at the LHC in 2011 and 2012 respectively. The measured fractions are used to probe the existence of anomalous Wtb couplings. [...] CMS-CR-2013-420; CERN-CMS-CR-2013-420.- Geneva : CERN, 2013 - 6 p. Fulltext: PDF;

2013-11-26
16:43
 Data preparation for the Compact Muon Solenoid experiment / Castello, Roberto (Louvain U.) /CMS Collaboration During the first 3 years of operation at the Large Hadron Collider (LHC), the Compact Muon Solenoid (CMS) experiment has collected data across evolving conditions of center of mass energy; instantaneous luminosity and collisions pile up. Following this evolution, the CMS collaboration has constantly strived to guarantee the prompt availability of high quality reconstructed data, in order to ensure early and sound physics results. [...] CMS-CR-2013-386; CERN-CMS-CR-2013-386.- Geneva : CERN, 2013 - 5 p. Fulltext: PDF;

2013-11-25
10:21
 Production and Performance of RE4 Resistive Plate Chambers for CMS experiments upgrade / Park, Sung Keun (Korea U.) /CMS Collaboration The fourth trigger station composed of 144 RPCs is currently constructed to enhance the efficiency of muon triggers in the endcap regions of the CMS detector. All new CMS endcap RPC gaps are produced in accordance with QA at Korea Detector Laboratory in Korea. [...] CMS-CR-2013-428; CERN-CMS-CR-2013-428.- Geneva : CERN, 2013 - 5 p. Fulltext: PDF;