Centrality Dependence Of Dihadron Correlations And Azimuthal Anisotropy Harmonics In Pbpb Collisions At Sqrt S Nn
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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.
Measurement Of Higher Order Harmonic Azimuthal Anisotropy In Pbpb Collisions At Sqrt S Nn
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Author :
language : en
Publisher:
Release Date : 2014
Measurement Of Higher Order Harmonic Azimuthal Anisotropy 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 2014 with categories.
Measurements are presented by the CMS Collaboration at the Large Hadron Collider (LHC) of the higher-order harmonic coefficients that describe the azimuthal anisotropy of charged particles emitted in sqrt(s[NN]) = 2.76 TeV PbPb collisions. Expressed in terms of the Fourier components of the azimuthal distribution, the n = 3-6 harmonic coefficients are presented for charged particles as a function of their transverse momentum (0.3
Azimuthal Anisotropy Of Charged Particles At High Transverse Momenta In Pbpb Collisions At Sqrt S Nn
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Author :
language : en
Publisher:
Release Date : 2012
Azimuthal Anisotropy Of Charged Particles At High Transverse Momenta 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.
The azimuthal anisotropy of charged particles in PbPb collisions at nucleon-nucleon center-of-mass energy of 2.76 TeV is measured with the CMS detector at the LHC over an extended transverse momentum (pt) range up to approximately 60 GeV. The data cover both the low-pt region associated with hydrodynamic flow phenomena and the high-pt region where the anisotropies may reflect the path-length dependence of parton energy loss in the created medium. The anisotropy parameter (v2) of the particles is extracted by correlating charged tracks with respect to the event-plane reconstructed by using the energy deposited in forward-angle calorimeters. For the six bins of collision centrality studied, spanning the range of 0-60% most-central events, the observed v2 values are found to first increase with pt, reaching a maximum around pt = 3 GeV, and then to gradually decrease to almost zero, with the decline persisting up to at least pt = 40 GeV over the full centrality range measured.
Azimuthal Anisotropy Of Charged Particles With Transverse Momentum Up To 100 Gev In Pbpb Collisions At Sqrt S Nn
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Author :
language : en
Publisher:
Release Date : 2017
Azimuthal Anisotropy Of Charged Particles With Transverse Momentum Up To 100 Gev 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 2017 with categories.
The Fourier coefficients v[2] and v[3] characterizing the anisotropy of the azimuthal distribution of charged particles produced in PbPb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV are measured with data collected by the CMS experiment. The measurements cover a broad transverse momentum range, pt= 1-100 GeV. The analysis focuses on pt> 10 GeV range, where anisotropic azimuthal distributions should reflect the path-length dependence of parton energy loss in the created medium. Results are presented in several bins of PbPb collision centrality, spanning the 60x% most central events. The v[2] coefficient is measured with the scalar product and the multiparticle cumulant methods, which have different sensitivities to the initial-state fluctuations. The values of both methods remain positive up to pt ~ 70 GeV, in all examined centrality classes. The v[3] coefficient, only measured with the scalar product method, tends to zero for pt>~ 20 GeV. Comparisons between theoretical calculations and data provide new constraints on the path-length dependence of parton energy loss in heavy ion collisions and highlight the importance of the initial-state fluctuations.
Suppression And Azimuthal Anisotropy Of Prompt And Nonprompt J Psi Production In Pbpb Collisions At Sqrt S Nn
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Author :
language : en
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Release Date : 2016
Suppression And Azimuthal Anisotropy Of Prompt And Nonprompt J Psi Production 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 2016 with categories.
The nuclear modification factor ${R_{\mathrm{AA}}} $ and the azimuthal anisotropy coefficient ${v_{2}} $ of prompt and nonprompt (i.e. those from decays of b hadrons) $\mathrm{J}/\psi$ mesons, measured from PbPb and pp collisions at $\sqrt{s_{\mathrm{NN}}} = $ 2.76 TeV at the LHC, are reported. The results are presented in several event centrality intervals and several kinematic regions, for transverse momenta $p_{\mathrm{T}}> $ 6.5 GeV/$c$ and rapidity $
Long Range Two Particle Correlations Of Strange Hadrons With Charged Particles In Ppb And Pbpb Collisions At Lhc Energies
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Author :
language : en
Publisher:
Release Date : 2015
Long Range Two Particle Correlations Of Strange Hadrons With Charged Particles In Ppb And Pbpb Collisions At Lhc Energies 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 measurements of two-particle angular correlations between an identified strange hadron ( K0s or [Lambda]/[Lambda]- ) and a charged particle, emitted in pPb collisions, are presented over a wide range in pseudorapidity and full azimuth. The data, corresponding to an integrated luminosity of approximately 35 nb-1, were collected at a nucleon-nucleon center-of-mass energy (√sNN ) of 5.02 TeV with the CMS detector at the LHC. Our results are compared to semi-peripheral PbPb collision data at √sNN , covering similar charged-particle multiplicities in the events. The observed azimuthal correlations at large relative pseudorapidity are used to extract the second-order (v2) and third-order (v3) anisotropy harmonics of K0s and [Lambda]/[Lambda]- particles. These quantities are studied as a function of the charged-particle multiplicity in the event and the transverse momentum of the particles. For high-multiplicity pPb events, a clear particle species dependence of v2 and v3 is observed. For pT
Jet Quenching Signatures From Very High Pt Dihadron Correlations In Pb Pb Collisions At Square Root Of S Nn
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Author : Rylan Towne Conway
language : en
Publisher:
Release Date : 2015
Jet Quenching Signatures From Very High Pt Dihadron Correlations In Pb Pb Collisions At Square Root Of S Nn written by Rylan Towne Conway 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.
Experimental measurements from dihadron correlations triggered with very high-p[subscript]T particles in Pb+Pb collisions at 2.76 TeV are shown. The data set was collected by the Compact Muon Solenoid (CMS) detector at the Large Hadron Collider (LHC) and corresponds to an integrated luminosity of 150 [mu]b−1. The use of high-p[subscript]T track triggers made it possible to study dihadron correlations up to p[subscript]T ~ 50 GeV/c. The presence of azimuthal anisotropies of final state particles in non-central Pb+Pb collisions gives rise to single-particle correlations that are characterized by the Fourier harmonics, v[subscript]n. To isolate the jet components of the correlations, the v2-v4 components are subtracted from the correlations and the per-trigger-particle associated-yields on the near and away side are studied. The data are compared to correlations from p+p collisions at the same center-of-mass energy over a wide range of trigger and associated-particle p[subscript]T and as a function of Pb+Pb event centrality. On the near-side there is evidence of moderate enhancement at low p[superscript]assc [subscript]T. On the away side there is a significant enhancement at p[superscript]assc [subscript]T ~ 0.5 GeV/c and at higher transverse momentum, p[superscript]assc [subscript]T > 3 GeV/c, there is a suppression of about 50% compared to p+p collisions.
Correlations Of Azimuthal Anisotropy Fourier Harmonics With Subevent Cumulants In Ppb Collisions At Snn
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Author : Albert M. Sirunyan
language : en
Publisher:
Release Date : 2019
Correlations Of Azimuthal Anisotropy Fourier Harmonics With Subevent Cumulants In Ppb Collisions At Snn written by Albert M. Sirunyan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Systematic Study Of Azimuthal Anisotropy In Cu Cu And Au Au Collisions At Snn
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Author :
language : en
Publisher:
Release Date : 2015
Systematic Study Of Azimuthal Anisotropy In Cu Cu And Au Au Collisions At Snn 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.
In this paper, we have studied the dependence of azimuthal anisotropy v2 for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of v2 as a function of transverse momentum pT and centrality in Au+Au collisions at √sNN=200 and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in v2 values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that v2 depends both on eccentricity and the number of participants, Npart. We observe that v2 divided by eccentricity (?) monotonically increases with Npart and scales as N1/3part. Thus, the Cu+Cu data at 62.4 GeV falls below the other scaled v2 data. For identified hadrons, v2 divided by the number of constituent quarks nq is independent of hadron species as a function of transverse kinetic energy KET=mT–m between 0.1KEsubT/sub/nsubq/sub1 GeV. Finally, combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of vsub2/sub/(nsubq/sub∙????????Nsup1/3/supsubpart/sub) vs KEsubT/sub/n