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CMS Conference Reports

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2014-07-31
11:35
Pseudorapidity dependence of near-side and away-side long-range correlations in pPb collisions with CMS / Xu, Lingshan (Purdue U.) /CMS Collaboration
Two-particle long-range pseudorapidity ($\Delta$$\eta$) correlations are observed in pPb collisions at the LHC. Previous correlation measurements have been averaged over both the trigger and associated particle $\eta$. [...]
CMS-CR-2014-163.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : 24th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Darmstadt, Germany, 19 - 24 May 2014

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2014-07-31
11:34
Studies of two-particle correlations with identified $\pi^0$, $K^0_s$ and Lambdas in pPb and PbPb collisions with CMS / Sharma, Monika (Vanderbilt U.) /CMS Collaboration
Observation of a long-range near-side two-particle correlation (known as the Ridge) in high-multiplicity pp and pPb collisions opened up new opportunities of exploring novel QCD dynamics in small collision systems. To further investigate the origin of this phenomenon, new measurements of two-particle correlations with identified $\pi^0$, $K^0_s$ and Lambda trigger particles in 5.02 TeV pPb and 2.76 TeV PbPb collisions are presented. [...]
CMS-CR-2014-161.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : 24th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Darmstadt, Germany, 19 - 24 May 2014

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2014-07-31
11:34
Azimuthal anisotropy of charged particles from multiparticle correlations in pPb and PbPb collisions with CMS / Wang, Quan (Kansas U.) /CMS Collaboration
Motivated by two- and four-particle azimuthal correlation measurements that suggest possible collective flow for charged particles emitted in pPb collisions at $\sqrt{s_{NN}}$ =5.02 TeV, we extend the correlation results for these collisions using the six- and eight-particle cumulant methods, and the Lee-Yang Zeros method. CMS has an extensive program studying azimuthal harmonic coefficients for both PbPb and pPb collisions using various methods. [...]
CMS-CR-2014-160.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : 24th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Darmstadt, Germany, 19 - 24 May 2014

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2014-07-31
11:34
Jet and charged hadron nuclear modification factors in pPb and PbPb collisions with CMS / Appelt, Eric Andrew (Vanderbilt U.) /CMS Collaboration
One of the signatures of the strongly interacting medium produced in central PbPbcollisions is the suppression of high-$p_{\rm T}$ jets and charged particles. Inorder to to disentangle the initial state and final state effects in heavy ioncollisions, the nuclear modification factor of both jets and of charged-particlesin pPb ($R_{\rm pPb}$) and PbPb ($R_{\rm PbPb}$) collisions are presented. [...]
CMS-CR-2014-159.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : 24th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Darmstadt, Germany, 19 - 24 May 2014

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2014-07-31
11:33
Charmonia in pp, pPb and PbPb with CMS / Moon, Dong Ho (Illinois U., Chicago) /CMS Collaboration
The mechanisms through which charmonia production is modified in the high-density medium created in ultra-relativistic heavy-ion collisions are still not quantitatively understood. In order to disentangle different scenarios, a multi-dimensional analysis in a wide kinematic range is needed, in pp and AA collisions, looking at many observables that have different sensitivities to the various aspects of charmonia production. [...]
CMS-CR-2014-156.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : 24th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Darmstadt, Germany, 19 - 24 May 2014

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2014-07-31
11:33
b-jet tagged nuclear modification factors in heavy ion collisions with CMS / Jung, Kurt (Purdue U.) /CMS Collaboration
The energy loss of jets in heavy-ion collisions is expected to depend on the flavor of the fragmenting parton. Thus, measurements of jet quenching as a function of flavor place powerful constraints on the thermodynamical and transport properties of the hot and dense medium. [...]
CMS-CR-2014-155.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : 24th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Darmstadt, Germany, 19 - 24 May 2014

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2014-07-31
11:33
Timing performance of the CMS electromagnetic calorimeter and prospects for the future / Bornheim, Adolf (Caltech) /CMS Collaboration
The CMS electromagnetic calorimeter (ECAL) is made of 75,848 scintillating lead tungstate crystals arranged in a barrel and two endcaps. The scintillation light is read out by avalanche photodiodes in the barrel and vacuum phototriodes in the endcaps, at which point the scintillation pulse is amplified and sampled at 40 MHz by the on-detector electronics. [...]
CMS-CR-2014-141.- Geneva : CERN, 2014 - 9 p. Fulltext: PDF;
In : Technology and Instrumentation in Particle Physics 2014, Amsterdam, Netherlands, 2 - 6 Jun 2014

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2014-07-31
11:33
Track reconstruction in CMS high luminosity environment / Goetzmann, Christophe (Strasbourg, IPHC) /CMS Collaboration
The CMS tracker is the largest silicon detector ever built, covering 200 square meters and providing an average of 14 high-precision measurements per track. Tracking is essential for the reconstruction of objects like jets, muons, electrons and tau leptons starting from the raw data from the silicon pixel and strip detectors. [...]
CMS-CR-2014-106.- Geneva : CERN, 2014 - 9 p. Fulltext: PDF;
In : Technology and Instrumentation in Particle Physics 2014, Amsterdam, Netherlands, 2 - 6 Jun 2014

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2014-07-29
13:39
Studies of dijet and photon-jet properties in pp, pPb and PbPb collisions with CMS / Barbieri, Richard Alexander (MIT) /CMS Collaboration
Studies of dijet and photon-jet properties in pPb collisions are of greatimportance to establish a QCD baseline for hadronic interactions with cold nuclearmatter. Dijet and photon-jet production have been measured in pPb collisions at anucleon-nucleon center-of-mass energy of 5.02 TeV. [...]
CMS-CR-2014-150.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : 24th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Darmstadt, Germany, 19 - 24 May 2014

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2014-07-29
13:39
Performance and study of B meson spectra in pp and pPb collisions in CMS / Innocenti, Gian Michele (MIT) /CMS Collaboration
B meson reconstruction is of great interest in the heavy ion collisions. Measurement of B meson pseudorapidity and transverse momentum spectra can provide useful inputs for the study flavor dependence of jet quenching in PbPb collisions and for the determination of the heavy flavor nuclear parton distribution functions in pPb collisions. [...]
CMS-CR-2014-147.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : 24th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Darmstadt, Germany, 19 - 24 May 2014

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