Principal Component Analysis Of Two Particle Azimuthal Correlations In Pbpb And Ppb Collisions At Cms
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Principal Component Analysis Of Two Particle Azimuthal Correlations In Pbpb And Ppb Collisions At Cms
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Author : CMS Collaboration
language : en
Publisher:
Release Date : 2017
Principal Component Analysis Of Two Particle Azimuthal Correlations In Pbpb And Ppb Collisions At Cms written by CMS Collaboration and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Observation Of Charge Dependent Azimuthal Correlations In Ppb Collisions And Its Implication For The Search For The Chiral Magnetic Effect
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Author :
language : en
Publisher:
Release Date : 2016
Observation Of Charge Dependent Azimuthal Correlations In Ppb Collisions And Its Implication For The Search For The Chiral Magnetic Effect written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Charge-dependent azimuthal particle correlations with respect to the second-order event plane in pPb and PbPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV have been studied with the CMS experiment at the LHC. The measurement is performed with a three-particle correlation technique, using two particles with the same or opposite charge within the pseudorapidity range abs(eta)
Evidence For Transverse Momentum And Pseudorapidity Dependent Event Plane Fluctuations In Pbpb And Ppb Collisions
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Author :
language : en
Publisher:
Release Date : 2015
Evidence For Transverse Momentum And Pseudorapidity Dependent Event Plane Fluctuations In Pbpb And Ppb Collisions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
A systematic study of the factorization of long-range azimuthal two-particle correlations into a product of single-particle anisotropies is presented as a function of pT and [eta] of both particles and as a function of the particle multiplicity in PbPb and pPb collisions. The data were taken with the CMS detector for PbPb collisions at √sNN=2.76 TeV and pPb collisions at √sNN=5.02 TeV, covering a very wide range of multiplicity. Factorization is observed to be broken as a function of both particle pT and [eta]. When measured with particles of different pT, the magnitude of the factorization breakdown for the second Fourier harmonic reaches 20% for very central PbPb collisions but decreases rapidly as the multiplicity decreases. The data are consistent with viscous hydrodynamic predictions, which suggest that the effect of factorization breaking is mainly sensitive to the initial-state conditions rather than to the transport properties (e.g., shear viscosity) of the medium. The factorization breakdown is also computed with particles of different [eta]. The effect is found to be weakest for mid-central PbPb events but becomes larger for more central or peripheral PbPb collisions, and also for very-high-multiplicity pPb collisions. The [eta]-dependent factorization data provide new insights to the longitudinal evolution of the medium formed in heavy ion collisions.
Centrality Dependence Of Dihadron Correlations And Azimuthal Anisotropy Harmonics In Pbpb Collisions At Sqrt S Nn
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Author :
language : en
Publisher:
Release Date : 2012
Centrality Dependence Of Dihadron Correlations And Azimuthal Anisotropy Harmonics In Pbpb Collisions At Sqrt S Nn written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Measurements from the CMS experiment at the LHC of dihadron correlations for charged particles produced in PbPb collisions at a nucleon-nucleon centre-of-mass energy of 2.76 TeV are presented. The results are reported as a function of the particle transverse momenta (pt) and collision centrality over a broad range in relative pseudorapidity [Delta(eta)] and the full range of relative azimuthal angle [Delta(phi)]. The observed two-dimensional correlation structure in Delta(eta) and Delta(phi) is characterised by a narrow peak at (Delta(eta), Delta(phi)) approximately (0, 0) from jet-like correlations and a long-range structure that persists up to at least.
Studies Of Azimuthal Dihadron Correlations In Ultra Central Pbpb Collisions At Sqrt S Nn
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Author :
language : en
Publisher:
Release Date : 2014
Studies Of Azimuthal Dihadron Correlations In Ultra Central Pbpb Collisions At Sqrt S Nn written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV by the CMS collaboration, using data from the 2011 LHC heavy-ion run. The data set includes a sample of ultra-central (0-0.2% centrality) PbPb events collected using a trigger based on total transverse energy in the hadron forward calorimeters and the total multiplicity of pixel clusters in the silicon pixel tracker. A total of about 1.8 million ultra-central events were recorded, corresponding to an integrated luminosity of 120 inverse microbarns. The observed correlations in ultra-central PbPb events are expected to be particularly sensitive to initial-state fluctuations. The single-particle anisotropy Fourier harmonics, from $v_2$ to $v_6$, are extracted as a function of particle transverse momentum. At higher transverse momentum, the $v_2$ harmonic becomes significantly smaller than the higher-order $v_n$ (n greater than or equal to 3). The pt-averaged $v_2$ and $v_3$ are found to be equal within 2%, while higher-order $v_n$ decrease as n increases. The breakdown of factorization of dihadron correlations into single-particle azimuthal anisotropies is observed. This effect is found to be most prominent in the ultra-central PbPb collisions, where the initial-state fluctuations play a dominant role. As a result, a comparison of the factorization data to hydrodynamic predictions with event-by-event fluctuating initial conditions is also presented.
Pseudorapidity Dependence Of Long Range Two Particle Correlations In P Pb Collisions At Sqrt S Nn
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Author :
language : en
Publisher:
Release Date : 2016
Pseudorapidity Dependence Of Long Range Two Particle Correlations In P Pb Collisions At Sqrt S Nn written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Two-particle correlations in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV are studied as a function of the pseudorapidity separation (Delta eta) of the particle pair at small relative azimuthal angle (abs(Delta phi)
Long Range Near Side Angular Correlations In Proton Proton Interactions In Cms
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Author :
language : en
Publisher:
Release Date : 2010
Long Range Near Side Angular Correlations In Proton Proton Interactions In Cms written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
The CMS Collaboration Results on two-particle angular correlations for charged particles emitted in proton-proton collisions at center of mass energies of 0.9, 2.36 and 7TeV over a broad range of pseudorapidity and azimuthal angle (f) are presented using data collected with the CMS detector at the LHC. Short-range correlations in??, which are studied in minimum bias events, are characterized using a simple independent cluster parameterization in order to quantify their strength (cluster size) and their extent in? (cluster decay width). Long-range azimuthal correlations are studied more differentially as a function of charged particle multiplicity and particle transverse momentum using a 980nb-1 data set at 7TeV. In high multiplicity events, a pronounced structure emerges in the two-dimensional correlation function for particles in intermediate pT's of 1-3GeV/c, 2.0>
Multiparticle Azimuthal Correlations In P Pb And Pb Pb Collisions At The Cern Large Hadron Collider
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Author :
language : en
Publisher:
Release Date : 2014
Multiparticle Azimuthal Correlations In P Pb And Pb Pb Collisions At The Cern Large Hadron Collider written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Our measurements of multiparticle azimuthal correlations (cumulants) for charged particles in p-Pb at √sNN=5.02 TeV and Pb-Pb at √sNN=2.76 TeV collisions are presented. They help address the question of whether there is evidence for global, flowlike, azimuthal correlations in the p-Pb system. These comparisons are made to measurements from the larger Pb-Pb system, where such evidence is established. In particular, the second harmonic two-particle cumulants are found to decrease with multiplicity, characteristic of a dominance of few-particle correlations in p-Pb collisions. However, when a.
Two Particle Azimuthal Correlation In D Au And P P Collisions At Snn
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Author : F. Benedosso
language : en
Publisher:
Release Date : 2008
Two Particle Azimuthal Correlation In D Au And P P Collisions At Snn written by F. Benedosso and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Evidence For Collective Multiparticle Correlations In P Pb Collisions
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Author :
language : en
Publisher:
Release Date : 2015
Evidence For Collective Multiparticle Correlations In P Pb Collisions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
The second-order azimuthal anisotropy Fourier harmonics, v2, are obtained in p-Pb and PbPb collisions over a wide pseudorapidity ([eta]) range based on correlations among six or more charged particles. The p-Pb data, corresponding to an integrated luminosity of 35 nb-1, were collected during the 2013 LHC p-Pb run at a nucleon-nucleon center-of-mass energy of 5.02 TeV by the CMS experiment. A sample of semiperipheral PbPb collision data at √sNN=2.76 TeV, corresponding to an integrated luminosity of 2.5 [mu]b-1 and covering a similar range of particle multiplicities as the p-Pb data, is also analyzed for comparison. The six- and eight-particle cumulant and the Lee-Yang zeros methods are used to extract the v2 coefficients, extending previous studies of two- and four-particle correlations. For both the p-Pb and PbPb systems, the v2 values obtained with correlations among more than four particles are consistent with previously published four-particle results. These data support the interpretation of a collective origin for the previously observed long-range (large [Delta][eta]) correlations in both systems. The ratios of v2 values corresponding to correlations including different numbers of particles are compared to theoretical predictions that assume a hydrodynamic behavior of a p-Pb system dominated by fluctuations in the positions of participant nucleons. These results provide new insights into the multiparticle dynamics of collision systems with a very small overlapping region.