Long Range Two Particle Correlations Of Strange Hadrons With Charged Particles In Ppb And Pbpb Collisions At Lhc Energies
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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
Cern Courier
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language : en
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Release Date : 2014
Cern Courier 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 Nuclear energy categories.
Evidence For Collectivity In Pp Collisions At The Lhc
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language : en
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Release Date : 2016
Evidence For Collectivity In Pp Collisions At The Lhc 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.
Measurements of two- and multi-particle angular correlations in pp collisions at sqrt(s) = 5, 7, and 13 TeV are presented as a function of charged-particle multiplicity. The data, corresponding to integrated luminosities of 1.0 inverse picobarns (5 TeV), 6.2 inverse picobarns (7 TeV), and 0.7 inverse picobarns (13 TeV), were collected using the CMS detector at the LHC. The second-order (v[2]) and third-order (v[3]) azimuthal anisotropy harmonics of unidentified charged particles, as well as v[2] of K0 short and Lambda/anti-Lambda particles, are extracted from long-range two-particle correlations as functions of particle multiplicity and transverse momentum. For high-multiplicity pp events, a mass ordering is observed for the v[2] values of charged hadrons (mostly pions), K0 short, and Lambda/anti-Lambda, with lighter particle species exhibiting a stronger azimuthal anisotropy signal below pt~2 GeV/c. For 13 TeV data, the v[2] signals are also extracted from four- and six-particle correlations for the first time in pp collisions, with comparable magnitude to those from two-particle correlations. These observations are similar to those seen in pPb and PbPb collisions, and support the interpretation of a collective origin for the observed long-range correlations in high-multiplicity pp collisions.
Flow Of Strange And Charged Particles In Ppb And Pbpb Collisions At Lhc Energies
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Author :
language : en
Publisher:
Release Date : 2016
Flow Of Strange And 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 2016 with categories.
Multiplicity And Rapidity Dependence Of Strange Hadron Production In Pp Ppb And Pbpb Collisions At The Lhc
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language : en
Publisher:
Release Date : 2016
Multiplicity And Rapidity Dependence Of Strange Hadron Production In Pp Ppb And Pbpb Collisions At The Lhc 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.
Measurements of strange hadron (K0s, Lambda + anti-Lambda, and Xi+ + Xi- ) transverse momentum spectra in pp, pPb, and PbPb collisions are presented over a wide range of rapidity and event charged-particle multiplicity. The data were collected with the CMS detector at the CERN LHC in pp collisions at sqrt(s) = 7 TeV, pPb collisions at sqrt(s[NN]) = 5.02 TeV, and PbPb collisions at sqrt(s[NN]) = 2.76 TeV. The average transverse kinetic energy is found to increase with multiplicity, at a faster rate for heavier strange particle species in all systems. At similar multiplicities, the difference in average transverse kinetic energy between different particle species is observed to be larger for pp and pPb events than for PbPb events. In pPb collisions, the average transverse kinetic energy is found to be slightly larger in the Pb-going direction than in the p-going direction for events with large multiplicity. The spectra are compared to models motivated by hydrodynamics.
Centrality Dependence Of Dihadron Correlations And Azimuthal Anisotropy Harmonics In Pbpb Collisions At Sqrt S Nn
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language : en
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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.
Evidence For Collective Multiparticle Correlations In P Pb Collisions
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language : en
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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.
Measurement Of Long Range Near Side Two Particle Angular Correlations In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
Measurement Of Long Range Near Side Two Particle Angular Correlations In Pp Collisions At Sqrt S 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.
Our results on two-particle angular correlations for charged particles produced in pp collisions at a center-of-mass energy of 13 TeV are presented. The data were taken with the CMS detector at the LHC and correspond to an integrated luminosity of about 270 nb-1. The correlations are studied over a broad range of pseudorapidity).
Long Range And Short Range Dihadron Angular Correlations In Central Pbpb Collisions At A Nucleon Nucleon Center Of Mass Energy Of 2 76 Tev
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language : en
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Release Date : 2011
Long Range And Short Range Dihadron Angular Correlations In Central Pbpb Collisions At A Nucleon Nucleon Center Of Mass Energy Of 2 76 Tev written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
First measurements of dihadron correlations for charged particles are presented for central PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV over a broad range in relative pseudorapidity, Delta(eta), and the full range of relative azimuthal angle, Delta(phi). The data were collected with the CMS detector, at the LHC. A broadening of the away-side (Delta(phi) approximately pi) azimuthal correlation is observed at all Delta(eta), as compared to the measurements in pp collisions. Furthermore, long-range dihadron correlations in Delta(eta) are observed for particles with similar phi values. This phenomenon, also known as the "ridge", persists up to at least.
Studies Of Two Particle Correlation Functions And Photon Tagged Jet Fragmentation In Pbpb And Pp Collisions With Cms At The Lhc
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Author : Dragos Alexandru Velicanu
language : en
Publisher:
Release Date : 2017
Studies Of Two Particle Correlation Functions And Photon Tagged Jet Fragmentation In Pbpb And Pp Collisions With Cms At The Lhc written by Dragos Alexandru Velicanu 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.
This thesis studies of two particle correlations in proton-proton (pp), proton-lead (pPb), and lead-lead (PbPb) collisions, as well as jet fragmentation functions for jets paired with an isolated prompt photon in pp and PbPb collisions to better understand matter in a Quark Gluon Plasma (QGP) state. The correlation studies measure the precise hydrodynamic behavior of PbPb collisions through a Fourier analysis of charged particles emitted from the QGP and show unexpectedly strong collective behavior in high multiplicity pp and pPb collisions. The photon-tagged jet studies provide tight constraints for understanding the interactions between the jet and the Quark Gluon Plasma it traverses by both measuring the jet substructure properties via the fragmentation function, and having a sample of jets unbiased by the interactions we are trying to probe by selecting high energy photon events. These analyses are performed using data recorded by the CMS experiment at the LHC from PbPb, pPb, and pp collisions at a center of mass energy of 5.02 TeV per nucleon-nucleon pair, as well as 2.76 TeV PbPb collisions and 7 TeV pp collisions in the correlation analyses.