skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Long-range two-particle correlations of strange hadrons with charged particles in pPb and PbPb collisions at LHC energies

Abstract

The measurements of two-particle angular correlations between an identified strange hadron ( K 0 s or Λ/Λ - ) 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 (√s NN ) of 5.02 TeV with the CMS detector at the LHC. Our results are compared to semi-peripheral PbPb collision data at √s NN , covering similar charged-particle multiplicities in the events. The observed azimuthal correlations at large relative pseudorapidity are used to extract the second-order (v 2) and third-order (v 3) anisotropy harmonics of K 0 s and Λ/Λ - 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 v 2 and v 3 is observed. For p T<2 GeV, the v 2 and v 3 values of K 0 s particles are larger than those of particles at the same p T. This splitting effect between two particle species is found to be stronger inmore » pPb than in PbPb collisions in the same multiplicity range. When divided by the number of constituent quarks and compared at the same transverse kinetic energy per quark, both v 2 and v 3 for K 0 s particles are observed to be consistent with those for Λ/Λ - particles at the 10% level in pPb collisions. This consistency extends over a wide range of particle transverse kinetic energy and event multiplicities.« less

Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI) (Armenia). et al.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
CMS Collaboration
OSTI Identifier:
1197971
Alternate Identifier(s):
OSTI ID: 1234845
Report Number(s):
FERMILAB-PUB-14-342-CMS; CERN-PH-EP-2014-212; CMS-HIN-14-002
Journal ID: ISSN 0370-2693; arXiv eprint number arXiv:1409.3392; TRN: US1601009
Grant/Contract Number:
AC02-07CH11359
Resource Type:
Journal Article: Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 742; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CMS; ridge; long-range; correlations; flow; high-multiplicity

Citation Formats

Khachatryan, Vardan. Long-range two-particle correlations of strange hadrons with charged particles in pPb and PbPb collisions at LHC energies. United States: N. p., 2015. Web. doi:10.1016/j.physletb.2015.01.034.
Khachatryan, Vardan. Long-range two-particle correlations of strange hadrons with charged particles in pPb and PbPb collisions at LHC energies. United States. doi:10.1016/j.physletb.2015.01.034.
Khachatryan, Vardan. Mon . "Long-range two-particle correlations of strange hadrons with charged particles in pPb and PbPb collisions at LHC energies". United States. doi:10.1016/j.physletb.2015.01.034.
@article{osti_1197971,
title = {Long-range two-particle correlations of strange hadrons with charged particles in pPb and PbPb collisions at LHC energies},
author = {Khachatryan, Vardan},
abstractNote = {The measurements of two-particle angular correlations between an identified strange hadron ( K0s or Λ/Λ- ) 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 Λ/Λ- 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<2 GeV, the v2 and v3 values of K0s particles are larger than those of particles at the same pT. This splitting effect between two particle species is found to be stronger in pPb than in PbPb collisions in the same multiplicity range. When divided by the number of constituent quarks and compared at the same transverse kinetic energy per quark, both v2 and v3 for K0s particles are observed to be consistent with those for Λ/Λ- particles at the 10% level in pPb collisions. This consistency extends over a wide range of particle transverse kinetic energy and event multiplicities.},
doi = {10.1016/j.physletb.2015.01.034},
journal = {Physics Letters. Section B},
number = ,
volume = 742,
place = {United States},
year = {Mon Jan 26 00:00:00 EST 2015},
month = {Mon Jan 26 00:00:00 EST 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.physletb.2015.01.034

Citation Metrics:
Cited by: 39 works
Citation information provided by
Web of Science

Save / Share: