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

CMS Collaboration

doi:10.1016/j.physletb.2015.01.034

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

CMS Collaboration

CERN
A. Alikhanian Yerevan Institute of Physics
Austrian Academy of Sciences
TU Wien
Belarusian State University
University of Antwerp
Vrije Universiteit Brussel
University of Florida
Université libre de Bruxelles
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Université catholique de Louvain
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National Institute of Chemical Physics and Biophysics, Tallinn
Lomonosov Moscow State University
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Bulgarian Academy of Sciences
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Peking University
Universidad de los Andes Colombia
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RWTH Aachen University
German Electron Synchrotron
Brandenburg University of Technology
University of Hamburg
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Demokritos National Centre for Scientific Research
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Research output: Contribution to journal › Article › peer-review

110 Scopus citations

Abstract

Measurements of two-particle angular correlations between an identified strange hadron (K_S ⁰ 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. The results are compared to semi-peripheral PbPb collision data at s_NN=2.76 TeV, 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 K_S ⁰ 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 p_T<2 GeV, the v₂ and v₃ values of K_S ⁰ particles are larger than those of Λ/Λ‾ particles at the same p_T. 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 K_S ⁰ 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.

Original language	English
Pages (from-to)	200-224
Number of pages	25
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	742
DOIs	https://doi.org/10.1016/j.physletb.2015.01.034
State	Published - 6 Mar 2015
Externally published	Yes

Keywords

CMS
Correlations
Flow
High-multiplicity
Long-range
Ridge

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10.1016/j.physletb.2015.01.034

Cite this

@article{34e803b8582844d3905e494461194874,

title = "Long-range two-particle correlations of strange hadrons with charged particles in pPb and PbPb collisions at LHC energies",

abstract = "Measurements of two-particle angular correlations between an identified strange hadron (KS 0 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. The results are compared to semi-peripheral PbPb collision data at sNN=2.76 TeV, 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 KS 0 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 KS 0 particles are larger than those of Λ/Λ‾ 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 KS 0 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.",

keywords = "CMS, Correlations, Flow, High-multiplicity, Long-range, Ridge",

author = "\{CMS Collaboration\} and V. Khachatryan and Sirunyan, \{A. M.\} and A. Tumasyan and W. Adam and T. Bergauer and M. Dragicevic and J. Er{\"o} and C. Fabjan and M. Friedl and R. Fr{\"u}hwirth and Ghete, \{V. M.\} and C. Hartl and N. H{\"o}rmann and J. Hrubec and M. Jeitler and W. Kiesenhofer and V. Kn{\"u}nz and M. Krammer and I. Kr{\"a}tschmer and D. Liko and I. Mikulec and D. Rabady and B. Rahbaran and H. Rohringer and R. Sch{\"o}fbeck and J. Strauss and A. Taurok and W. Treberer-Treberspurg and W. Waltenberger and Wulz, \{C. E.\} and V. Mossolov and N. Shumeiko and \{Suarez Gonzalez\}, J. and S. Alderweireldt and M. Bansal and S. Bansal and T. Cornelis and \{De Wolf\}, \{E. A.\} and X. Janssen and A. Knutsson and S. Luyckx and S. Ochesanu and R. Rougny and \{Van De Klundert\}, M. and \{Van Haevermaet\}, H. and \{Van Mechelen\}, P. and \{Van Remortel\}, N. and \{Van Spilbeeck\}, A. and F. Blekman and T. Cheng",

note = "Publisher Copyright: {\textcopyright} 2015 The Authors",

year = "2015",

month = mar,

day = "6",

doi = "10.1016/j.physletb.2015.01.034",

language = "英语",

volume = "742",

pages = "200--224",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Long-range two-particle correlations of strange hadrons with charged particles in pPb and PbPb collisions at LHC energies

AU - CMS Collaboration

AU - Khachatryan, V.

AU - Sirunyan, A. M.

AU - Tumasyan, A.

AU - Adam, W.

AU - Bergauer, T.

AU - Dragicevic, M.

AU - Erö, J.

AU - Fabjan, C.

AU - Friedl, M.

AU - Frühwirth, R.

AU - Ghete, V. M.

AU - Hartl, C.

AU - Hörmann, N.

AU - Hrubec, J.

AU - Jeitler, M.

AU - Kiesenhofer, W.

AU - Knünz, V.

AU - Krammer, M.

AU - Krätschmer, I.

AU - Liko, D.

AU - Mikulec, I.

AU - Rabady, D.

AU - Rahbaran, B.

AU - Rohringer, H.

AU - Schöfbeck, R.

AU - Strauss, J.

AU - Taurok, A.

AU - Treberer-Treberspurg, W.

AU - Waltenberger, W.

AU - Wulz, C. E.

AU - Mossolov, V.

AU - Shumeiko, N.

AU - Suarez Gonzalez, J.

AU - Alderweireldt, S.

AU - Bansal, M.

AU - Bansal, S.

AU - Cornelis, T.

AU - De Wolf, E. A.

AU - Janssen, X.

AU - Knutsson, A.

AU - Luyckx, S.

AU - Ochesanu, S.

AU - Rougny, R.

AU - Van De Klundert, M.

AU - Van Haevermaet, H.

AU - Van Mechelen, P.

AU - Van Remortel, N.

AU - Van Spilbeeck, A.

AU - Blekman, F.

AU - Cheng, T.

PY - 2015/3/6

Y1 - 2015/3/6

N2 - Measurements of two-particle angular correlations between an identified strange hadron (KS 0 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. The results are compared to semi-peripheral PbPb collision data at sNN=2.76 TeV, 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 KS 0 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 KS 0 particles are larger than those of Λ/Λ‾ 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 KS 0 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.

AB - Measurements of two-particle angular correlations between an identified strange hadron (KS 0 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. The results are compared to semi-peripheral PbPb collision data at sNN=2.76 TeV, 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 KS 0 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 KS 0 particles are larger than those of Λ/Λ‾ 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 KS 0 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.

KW - CMS

KW - Correlations

KW - Flow

KW - High-multiplicity

KW - Long-range

KW - Ridge

UR - https://www.scopus.com/pages/publications/85041757380

U2 - 10.1016/j.physletb.2015.01.034

DO - 10.1016/j.physletb.2015.01.034

M3 - 文章

AN - SCOPUS:85041757380

SN - 0370-2693

VL - 742

SP - 200

EP - 224

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

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

Abstract

Keywords

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