Centrality dependence of charged particle production at large transverse momentum in Pb–Pb collisions at √sNN=2.76 TeV

ALICE Collaboration

doi:10.1016/j.physletb.2013.01.051

Centrality dependence of charged particle production at large transverse momentum in Pb–Pb collisions at √s_NN=2.76 TeV

ALICE Collaboration

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325 Scopus citations

Abstract

The inclusive transverse momentum (p_T) distributions of primary charged particles are measured in the pseudo-rapidity range |η|<0.8 as a function of event centrality in Pb–Pb collisions at s_NN=2.76 TeV with ALICE at the LHC. The data are presented in the p_T range 0.15<p_T<50 GeV/c for nine centrality intervals from 70–80% to 0–5%. The results in Pb–Pb are presented in terms of the nuclear modification factor R_AA using a pp reference spectrum measured at the same collision energy. We observe that the suppression of high-p_T particles strongly depends on event centrality. The yield is most suppressed in central collisions (0–5%) with R_AA≈0.13 at p_T=6–7 GeV/c. Above p_T=7 GeV/c, there is a significant rise in the nuclear modification factor, which reaches R_AA≈0.4 for p_T>30 GeV/c. In peripheral collisions (70–80%), only moderate suppression (R_AA=0.6–0.7) and a weak p_T dependence is observed. The measured nuclear modification factors are compared to other measurements and model calculations.

Original language	English
Pages (from-to)	52-62
Number of pages	11
Journal	Physics Letters B
Volume	720
Issue number	1-3
DOIs	https://doi.org/10.1016/j.physletb.2013.01.051
State	Published - Mar 13 2013
Externally published	Yes

Funding

The ALICE Collaboration acknowledges the following funding agencies for their support in building and running the ALICE detector: Calouste Gulbenkian Foundation from Lisbon and Swiss Fonds Kidagan , Armenia; Conselho Nacional de Desenvolvimento Cient\u00EDfico e Tecnol\u00F3gico (CNPq) , Financiadora de Estudos e Projetos (FINEP) , Funda\u00E7\u00E3o de Amparo \u00E0 Pesquisa do Estado de S\u00E3o Paulo (FAPESP) ; National Natural Science Foundation of China (NSFC) , the Chinese Ministry of Education (CMOE) and the Ministry of Science and Technology of China (MSTC) ; Ministry of Education and Youth of the Czech Republic ; Danish Natural Science Research Council , the Carlsberg Foundation and the Danish National Research Foundation ; The European Research Council under the European Community\u02BCs Seventh Framework Programme ; Helsinki Institute of Physics and the Academy of Finland ; French CNRS-IN2P3 , the \u2018Region Pays de Loire\u2019 , \u2018Region Alsace\u2019 , \u2018Region Auvergne\u2019 and CEA , France; German BMBF and the Helmholtz Association ; General Secretariat for Research and Technology, Ministry of Development , Greece; Hungarian OTKA and National Office for Research and Technology (NKTH) ; Department of Atomic Energy and Department of Science and Technology of the Government of India ; Istituto Nazionale di Fisica Nucleare (INFN) of Italy ; MEXT Grant-in-Aid for Specially Promoted Research , Japan; Joint Institute for Nuclear Research , Dubna; National Research Foundation of Korea (NRF) ; CONACYT , DGAPA , M\u00E9xico, ALFA-EC and the HELEN Program (High-Energy physics Latin-American\u2013European Network) ; Stichting voor Fundamenteel Onderzoek der Materie (FOM) and the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) , Netherlands; Research Council of Norway (NFR) ; Polish Ministry of Science and Higher Education ; National Authority for Scientific Research \u2014 NASR (Autoritatea Na\u0163ional\u0103 pentru Cercetare \u015Etiin\u0163ific\u0103 \u2014 ANCS) ; Federal Agency of Science of the Ministry of Education and Science of Russian Federation , International Science and Technology Center , Russian Academy of Sciences , Russian Federal Agency of Atomic Energy , Russian Federal Agency for Science and Innovations and CERN-INTAS ; Ministry of Education of Slovakia ; Department of Science and Technology , South Africa; CIEMAT , EELA , Ministerio de Educaci\u00F3n y Ciencia of Spain , Xunta de Galicia (Conseller\u00EDa de Educaci\u00F3n) , CEADEN, Cubaenerg\u00EDa , Cuba, and IAEA (International Atomic Energy Agency) ; Swedish Research Council (VR) and Knut & Alice Wallenberg Foundation (KAW) ; Ukraine Ministry of Education and Science ; United Kingdom Science and Technology Facilities Council (STFC) ; The United States Department of Energy , the United States National Science Foundation , the State of Texas , and the State of Ohio .

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10.1016/j.physletb.2013.01.051

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@article{bf9a407eb64942f788737c6fd759fcaf,

title = "Centrality dependence of charged particle production at large transverse momentum in Pb–Pb collisions at √sNN=2.76 TeV",

abstract = "The inclusive transverse momentum (pT) distributions of primary charged particles are measured in the pseudo-rapidity range |η|<0.8 as a function of event centrality in Pb–Pb collisions at sNN=2.76 TeV with ALICE at the LHC. The data are presented in the pT range 0.15T<50 GeV/c for nine centrality intervals from 70–80% to 0–5%. The results in Pb–Pb are presented in terms of the nuclear modification factor RAA using a pp reference spectrum measured at the same collision energy. We observe that the suppression of high-pT particles strongly depends on event centrality. The yield is most suppressed in central collisions (0–5%) with RAA≈0.13 at pT=6–7 GeV/c. Above pT=7 GeV/c, there is a significant rise in the nuclear modification factor, which reaches RAA≈0.4 for pT>30 GeV/c. In peripheral collisions (70–80%), only moderate suppression (RAA=0.6–0.7) and a weak pT dependence is observed. The measured nuclear modification factors are compared to other measurements and model calculations.",

author = "{ALICE Collaboration} and B. Abelev and J. Adam and D. Adamov{\'a} and Adare, {A. M.} and Aggarwal, {M. M.} and {Aglieri Rinella}, G. and Agocs, {A. G.} and A. Agostinelli and {Aguilar Salazar}, S. and Z. Ahammed and N. Ahmad and {Ahmad Masoodi}, A. and Ahn, {S. A.} and Ahn, {S. U.} and A. Akindinov and D. Aleksandrov and B. Alessandro and {Alfaro Molina}, R. and A. Alici and A. Alkin and {Almar{\'a}z Avi{\~n}a}, E. and J. Alme and T. Alt and V. Altini and S. Altinpinar and I. Altsybeev and C. Andrei and A. Andronic and V. Anguelov and J. Anielski and C. Anson and T. Anti{\v c}i{\'c} and F. Antinori and P. Antonioli and L. Aphecetche and H. Appelsh{\"a}user and N. Arbor and S. Arcelli and A. Arend and N. Armesto and R. Arnaldi and T. Aronsson and Arsene, {I. C.} and M. Arslandok and A. Asryan and A. Augustinus and R. Averbeck and Awes, {T. C.} and I. Garishvili and Read, {K. F.}",

note = "Publisher Copyright: {\textcopyright} 2013 CERN",

year = "2013",

month = mar,

day = "13",

doi = "10.1016/j.physletb.2013.01.051",

language = "English",

volume = "720",

pages = "52--62",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

number = "1-3",

}

TY - JOUR

T1 - Centrality dependence of charged particle production at large transverse momentum in Pb–Pb collisions at √sNN=2.76 TeV

AU - ALICE Collaboration

AU - Abelev, B.

AU - Adam, J.

AU - Adamová, D.

AU - Adare, A. M.

AU - Aggarwal, M. M.

AU - Aglieri Rinella, G.

AU - Agocs, A. G.

AU - Agostinelli, A.

AU - Aguilar Salazar, S.

AU - Ahammed, Z.

AU - Ahmad, N.

AU - Ahmad Masoodi, A.

AU - Ahn, S. A.

AU - Ahn, S. U.

AU - Akindinov, A.

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Alfaro Molina, R.

AU - Alici, A.

AU - Alkin, A.

AU - Almaráz Aviña, E.

AU - Alme, J.

AU - Alt, T.

AU - Altini, V.

AU - Altinpinar, S.

AU - Altsybeev, I.

AU - Andrei, C.

AU - Andronic, A.

AU - Anguelov, V.

AU - Anielski, J.

AU - Anson, C.

AU - Antičić, T.

AU - Antinori, F.

AU - Antonioli, P.

AU - Aphecetche, L.

AU - Appelshäuser, H.

AU - Arbor, N.

AU - Arcelli, S.

AU - Arend, A.

AU - Armesto, N.

AU - Arnaldi, R.

AU - Aronsson, T.

AU - Arsene, I. C.

AU - Arslandok, M.

AU - Asryan, A.

AU - Augustinus, A.

AU - Averbeck, R.

AU - Awes, T. C.

AU - Garishvili, I.

AU - Read, K. F.

PY - 2013/3/13

Y1 - 2013/3/13

N2 - The inclusive transverse momentum (pT) distributions of primary charged particles are measured in the pseudo-rapidity range |η|<0.8 as a function of event centrality in Pb–Pb collisions at sNN=2.76 TeV with ALICE at the LHC. The data are presented in the pT range 0.15T<50 GeV/c for nine centrality intervals from 70–80% to 0–5%. The results in Pb–Pb are presented in terms of the nuclear modification factor RAA using a pp reference spectrum measured at the same collision energy. We observe that the suppression of high-pT particles strongly depends on event centrality. The yield is most suppressed in central collisions (0–5%) with RAA≈0.13 at pT=6–7 GeV/c. Above pT=7 GeV/c, there is a significant rise in the nuclear modification factor, which reaches RAA≈0.4 for pT>30 GeV/c. In peripheral collisions (70–80%), only moderate suppression (RAA=0.6–0.7) and a weak pT dependence is observed. The measured nuclear modification factors are compared to other measurements and model calculations.

AB - The inclusive transverse momentum (pT) distributions of primary charged particles are measured in the pseudo-rapidity range |η|<0.8 as a function of event centrality in Pb–Pb collisions at sNN=2.76 TeV with ALICE at the LHC. The data are presented in the pT range 0.15T<50 GeV/c for nine centrality intervals from 70–80% to 0–5%. The results in Pb–Pb are presented in terms of the nuclear modification factor RAA using a pp reference spectrum measured at the same collision energy. We observe that the suppression of high-pT particles strongly depends on event centrality. The yield is most suppressed in central collisions (0–5%) with RAA≈0.13 at pT=6–7 GeV/c. Above pT=7 GeV/c, there is a significant rise in the nuclear modification factor, which reaches RAA≈0.4 for pT>30 GeV/c. In peripheral collisions (70–80%), only moderate suppression (RAA=0.6–0.7) and a weak pT dependence is observed. The measured nuclear modification factors are compared to other measurements and model calculations.

UR - http://www.scopus.com/inward/record.url?scp=85040604787&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2013.01.051

DO - 10.1016/j.physletb.2013.01.051

M3 - Article

AN - SCOPUS:85040604787

SN - 0370-2693

VL - 720

SP - 52

EP - 62

JO - Physics Letters B

JF - Physics Letters B

IS - 1-3

ER -

Centrality dependence of charged particle production at large transverse momentum in Pb–Pb collisions at √s_NN=2.76 TeV

Abstract

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