2013-05-17
09:36 |
Flow Phenomena in CMS.
/ Wang, Quan (Kansas U.)
/CMS Collaboration
This proceeding reports the measurement of azimuthal angle correlations of charged hadrons in $\sqrt{s_{NN}} = 2.76$ TeV Pb+Pb collisions by the CMS experiment.The second order harmonic, elliptic flow $v_2$ was shown as a function of transverse momentum ($p_{T}$) and centrality in a broad kinematic range.Various methods were employed to extract the signal strength of the harmonics the event-plane method, cumulant, Lee-Yang Zeros and di-hadron correlation method.Higher order harmonic results, $v_3$ from event-plane method and $v_3$, $v_4$, $v_5$ and $v_6$ from di-hadron correlation methods were also shown.The results indicate that higher order harmonics are mainly dominated by initial state fluctuations.Neutral particle $\pi^0$ elliptic $v_2$ results and high $p_T$ up to 60 GeV/$c$ particle elliptic $v_2$ results are also shown.The di-hadron correlation results of $v_2$ and $v_3$ in $\sqrt{s_{NN}} = 5.02$ TeV p+Pb collisions are presented, which give more open questions..
CMS-CR-2013-119; CERN-CMS-CR-2013-119.-
Geneva : CERN, 2013 - 5 p.
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2013-05-17
09:36 |
Performance of the CMS electromagnetic calorimeter and its role in the hunt for the Higgs boson in the two-photon channel
/ De Guio, Federico (INFN, Milan Bicocca ; Milan Bicocca U.)
/CMS Collaboration
The electromagnetic calorimeter of CMS (ECAL) is a hermetic, fine grained and homogeneous calorimeter containing 75848 lead-tungstate (PbWO4) crystals, completed by a silicon preshower installed in front of the endcaps. The ECAL sensitivity to decay modes with electromagnetic objects in the final state, such as narrow resonances decaying into two photons, is achieved through its excellent energy and position resolution. [...]
CMS-CR-2013-085; CERN-CMS-CR-2013-085.-
Geneva : CERN, 2013 - 9 p.
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2013-05-16
13:39 |
Search for new physics with same-sign isolated dilepton events in CMS
/ Spiezia, Aniello (INFN, Perugia ; Perugia U.)
/CMS Collaboration
An inclusive search for the presence of new physics in events with two isolated same sign leptons, using the first 4.98 fb$^{-1}$ of certified CMS data taken in 2011 is presented. The topology is sensitive to many models beyond the standard model like supersymmetric models, extra dimensions, heavy majorana neutrinos and double charged higgs. [...]
CMS-CR-2013-121; CERN-CMS-CR-2013-121.-
Geneva : CERN, 2013 - 3 p.
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2013-05-16
13:39 |
CMS results on top physics
/ Ivanov, Andrey (Kansas State U.)
/CMS Collaboration
We present a review of recent results from the CMS experiment on top quark physics.
CMS performed measurements of top quark mass, charge, and decay properties,
$\mathrm{t\bar{t}}$ and single top quark production cross sections in several
channels, as well as measurements of differential production cross sections
and $\mathrm{t\bar{t}}$ production properties: charge asymmetry, spin correlations
and top quark polarization. [...]
CMS-CR-2013-117; CERN-CMS-CR-2013-117.-
Geneva : CERN, 2013 - 14 p.
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2013-05-16
13:39 |
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2013-05-16
13:39 |
Measurements of Heavy Flavour Properties at the LHC
/ Covarelli, Roberto (Rochester U.)
/ATLAS and CMS Collaborations
Thanks to the excellent performances of ATLAS and CMS in triggering on muon signals and reconstructing these particles down to low transverse momentum,large samples of heavy-flavored hadrons have been collected in the 2011 LHC run at $\sqrt{s} = 7$ TeV. The analysis of these samples hasenabled both experiments to perform competitive measurements of heavy-flavorproperties, such as quarkonium polarization, lifetime and $CP$-violationmeasurements, hadron spectroscopy and branching ratios of rare $B$ decays..
CMS-CR-2013-115; CERN-CMS-CR-2013-115.-
Geneva : CERN, 2013 - p.
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2013-05-16
13:37 |
Measurement of the X(3872) production cross section via decays to $J/\psi \pi^{+}\pi^{-}$
/ Dall'Osso, Martino (INFN, Bologna ; Bologna U.)
/CMS Collaboration
The production of the X(3872) is studied in $pp$ collisions at $\sqrt{s} = 7$ TeV with the CMS detector at LHC, using decays to $J/\psi\pi^{+}\pi^{-}$ where the $J/\psi$ decays to two muons. The cross-section ratio with respect to the $\psi(2S)$ and the fraction of X(3872) coming from B-hadron decays are measured as a function of transverse momentum ($p_{T}$), covering unprecedentedly high values of $p_{T}$. [...]
CMS-CR-2013-114; CERN-CMS-CR-2013-114.-
Geneva : CERN, 2013 - 6 p.
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2013-05-16
13:37 |
Search for new physics using events with two same-sign isolated leptons in the final state at CMS
/ Folgueras, Santiago (Oviedo U.)
/CMS Collaboration
We present a search for new physics using events with two same-sign isolated leptons with/out the presence of b-jets in the final state, targetting two very different SUSY scenarios, one dominated by strong production of squarks and gluinos where the $3^{rd}$ generation squarks are lighter than other squarks and the other dominated by electroweak production neglecting completely any strongly interacting particles. No excees above the standard model background is observed. [...]
CMS-CR-2013-113; CERN-CMS-CR-2013-113.-
Geneva : CERN, 2013 - 5 p.
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2013-05-16
13:37 |
CMS Measurements of a New Boson in the Gamma Gamma Channel
/ Palmer, Christopher Allan (UC, San Diego)
/CMS Collaboration
CMS reports on the recently updated, preliminary results with the full datasets of 2011 and 2012 in the analysis of the Higgs-like Boson at 125 GeV. Utilizing 5.1$fb^{-1}$ of 7 TeV data and 19.6$fb^{-1}$ of 8 TeV data, a signal strength of $0.78^{+0.28}_{-0.26}$ times the Standard Model (SM) expectations with a mass of $125.4\pm0.8$ GeV is observed. [...]
CMS-CR-2013-112; CERN-CMS-CR-2013-112.-
Geneva : CERN, 2013 - 6 p.
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2013-05-16
13:37 |
Hard Probes in CMS.
/ Mao, Yaxian (Vanderbilt U.)
/CMS Collaboration
This paper reviews recent experimental results on hard probes in heavy-ion collisions from the CMS Collaboration. These studies include various energy loss phenomena (jet nuclear modification factors, tagged b-quark jets, dijet and photon-jet energy imbalance); observables characterizing jet properties like jet fragmentation function and jet shapes; and measurements of high-$p_T$ charged hadrons from jet fragmentation (nuclear modification factors up to 100~GeV/$c$. [...]
CMS-CR-2013-111; CERN-CMS-CR-2013-111.-
Geneva : CERN, 2013 - 5 p.
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