CERN Accelerating science

CMS Conference Reports

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2017-04-12
14:31
Evidence for collective phenomena in pp collisions with CMS / Chen, Zhenyu (Rice U.) /CMS Collaboration
Observation of long-range ridge-like correlations in high-multiplicity pp collisions opened up new opportunities for exploring novel QCD dynamics in small collision systems. Based on data collected in 2015 and 2016 with the CMS detector at the LHC, the second-order ($v_{2}$) and third-order ($v_{3}$) azimuthal anisotropy harmonics of $K_{s}^{0}$, $\Lambda$ and inclusive charged particles are extracted from long-range two-particle correlations as functions of particle multiplicity and transverse momentum. [...]
CMS-CR-2017-104.- Geneva : CERN, 2017 - 5 p. Fulltext: PDF;
In : The XXVI international conference on ultrarelativistic heavy-ion collisions, Chicago, United States Of America, 6 - 11 Feb 2017

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2017-04-12
14:31
Azimuthal anisotropies at very high $p_{T}$ from two- and multi-particle correlations in PbPb collision at 5.02 TeV with CMS / Wang, Quan (Kansas U.) /CMS Collaboration
Studies of azimuthal anisotropies for very high $p_{T}$ particles in relativistic heavy ion collisions provide crucial information on the path length dependence of the parton energy loss mechanism in the quark-gluon plasma. Final high-precision data on the elliptic ($v_{2}$) and triangular ($v_{3}$) anisotropy harmonics of charged particles, obtained with the scalar product method, are presented up to $p_{T}$ $\sim$ 100 GeV/c in PbPb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV, using data recorded during the LHC run 2 with the CMS detector. [...]
CMS-CR-2017-102.- Geneva : CERN, 2017 - 5 p. Fulltext: PDF;
In : The XXVI international conference on ultrarelativistic heavy-ion collisions, Chicago, United States Of America, 6 - 11 Feb 2017

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2017-04-12
14:31
Observation of charge-dependent azimuthal correlations in pPb collisions with CMS and its implication for the search of the Chiral Magnetic Effect / Tu, Zhoudunming (Rice U.) /CMS Collaboration
Charge-dependent azimuthal correlations relative to the event plane in AA collisions have been suggested as providing evidence for the chiral magnetic effect (CME) caused by local strong parity violation. However, the observation of the CME remains inconclusive because of several possible sources of background correlations that may account for part or all of the observed signals. [...]
CMS-CR-2017-095.- Geneva : CERN, 2017 - 5 p. Fulltext: PDF;
In : The XXVI international conference on ultrarelativistic heavy-ion collisions, Chicago, United States Of America, 6 - 11 Feb 2017

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2017-04-12
14:30
New insights of multi-particle azimuthal correlations with symmetric cumulants in p-p, p-Pb, and Pb-Pb collisions / Guilbaud, Maxime (Rice U.) /CMS Collaboration
The first comparison of anisotropy harmonics ($v_{n}$, n = 2--4) and event-by-event correlations of different orders between p--p (13 TeV), p--Pb (5.02 and 8.16 TeV) and Pb--Pb (5.02 TeV) as a function of multiplicity is presented. The $v_{n}$ coefficients are extracted via long-range ($\abs(\Delta\eta) >$~2) two-particle correlations reaching a very-high-multiplicity region. [...]
CMS-CR-2017-091.- Geneva : CERN, 2017 - 5 p. Fulltext: PDF;
In : The XXVI international conference on ultrarelativistic heavy-ion collisions, Chicago, United States Of America, 6 - 11 Feb 2017

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2017-04-10
16:37
Results on top-quark physics and top-quark-like signatures by CMS / Chabert, Eric Christian (Strasbourg, IPHC) /CMS Collaboration
This report reviews the results obtained by the CMS Collaboration on top quark physics, focusing on the latest ones based on p--p collisions provided by the LHC at $\sqrt{s}$=13 TeV during Run II. It covers measurements of single-top, top quark pairs and associated productions as well as measurements of top quark properties.Finally several beyond the standard model searches involving top quark in the final states are presented such as searches for supersymmetry in the third generation, heavy resonances decaying into a top quark pair, or dark matter produced in association to a single-top or a top quark pair..
CMS-CR-2017-090.- Geneva : CERN, 2017 - 9 p. Fulltext: PDF;
In : Kruger2016 - Workshop on Discovery Physics at the LHC, Mpumulanga, South Africa, 4 - 9 Dec 2016

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2017-04-06
16:46
New physics searches in the top quark sector (excluding ttbar resonance searches) / Das, Pallabi (TIFR, Mumbai, DHEP) /ATLAS ,CMS and Top Collaborations
Several theories beyond the Standard Model of Particle Physics predict new and heavy particles yet to be observed in the hadron colliders. These particles are likely to decay through the heavy top quark, making it suitable as a probe for new physics phenomena. [...]
CMS-CR-2017-031.- Geneva : CERN, 2017 - 7 p. Fulltext: PDF;
In : 9th International Workshop on the CKM Unitarity Triangle, Mumbai, India, 28 Nov - 2 Dec 2016

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2017-04-04
13:43
Flavor Changing Neutral Current searches in the top quark sector / Bhowmik, Sandeep (Bhubaneswar, NISER) /ATLAS ,CMS and Top Collaborations
Flavor changing neutral current (FCNC) interactions in top quark are highly suppressed in the Standard Model. Therefore, any measurable branching ratio for top FCNC decays is an indication of new physics. [...]
CMS-CR-2017-097.- Geneva : CERN, 2017 - 8 p. Fulltext: PDF;
In : 9th International Workshop on the CKM Unitarity Triangle, Mumbai, India, 28 Nov - 2 Dec 2016

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2017-04-03
10:44
Final state multiplicity and particle correlation in small systems / Mariani, Valentina (INFN, Perugia ; Perugia U.) /CMS Collaboration
Final state variables and particle correlation will be discussed under a Multiple Parton Interaction (MPI) interpretation. The state of the art about the latest results on such variables will be provided. [...]
CMS-CR-2017-099.- Geneva : CERN, 2017 - 11 p. Fulltext: PDF;
In : 8th International Workshop on Multiple Partonic Interactions at the LHC, San Cristóbal De Las Casa, Mexico, 28 Nov - 2 Dec 2016

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2017-03-16
09:49
Higgs Physics at CMS / Donato, Silvio (Zurich U.) /CMS Collaboration
The discovery of the Standard Model Higgs boson performed by the CMS and ATLAS collaborations during the LHC Run 1 has been an important success. This document is a short review of the search for the Higgs boson performed by the CMS collaboration during the LHC Run 1 and Run 2. [...]
CMS-CR-2017-093.- Geneva : CERN, 2017 - 20 p. Fulltext: PDF;
In : 5th Symposium on Prospects in the Physics of Discrete Symmetries, Warsaw, Poland, 28 Nov - 3 Dec 2016

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2017-03-16
09:48
Performance of the CMS 2S $p_T$ module prototype using CBC2 readout at beam tests / Roy Chowdhury, Suvankar (Saha Inst.) /CMS Collaboration
As the LHC will enter into its high luminosity phase\,(HL-LHC), operating at a luminosity of $5\rm{\mbox{-}}7.5\times10^{34}~\rm cm^{-2}\rm s^{-1}$, the CMS experiment will replace the Run 2 tracker with a new one which will be able to sustain the increased number of collisions per bunch crossing, which can be as high as 200. The tracker information will be used in the Level-1 trigger to reject low $p_T$ tracks. [...]
CMS-CR-2017-063.- Geneva : CERN, 2017 - 5 p. Fulltext: PDF;
In : 22nd DAE-BRNS High Energy Physics Symposium, Delhi, India, 12 -16 Dec 2016

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