Journal
PHYSICS LETTERS B
Volume 696, Issue 1-2, Pages 30-39Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2010.12.020
Keywords
R-AA; Nuclear modification factor; Pb-Pb; root s(NN)=2.76 TeV; ALICE; LHC
Funding
- Lisbon and Swiss Fonds Kidagan, Armenia
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Financiadora de Estudos e Projetos (FINEP)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
- National Natural Science Foundation of China (NSFC)
- Chinese Ministry of Education (CMOE)
- Ministry of Science and Technology of China (MSTC)
- Ministry of Education and Youth of the Czech Republic
- Danish Natural Science Research Council
- Carlsberg Foundation
- Danish National Research Foundation
- European Research Council under the European Community
- Helsinki Institute of Physics
- Academy of Finland
- French CNRS-IN2P3
- Region Pays de Loire
- Region Alsace
- Region Auvergne
- CEA, France
- German BMBF
- Helmholtz Association
- Greek Ministry of Research and Technology
- Hungarian OTKA
- 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, Japan
- Joint Institute for Nuclear Research, Dubna
- National Research Foundation of Korea (NRF)
- CONACYT
- DGAPA, Mexico
- ALFA-EC
- HELEN Program (High-Energy physics Latin-American-European Network)
- Stichting voor Fundamenteel Onderzoek der Materie (FOM)
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands
- Research Council of Norway (NFR)
- Polish Ministry of Science and Higher Education
- National Authority for Scientific Research - NASR (Autoritatea Nationala pentru Cercetare Stiintifica - 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
- CERN-INTAS
- Ministry of Education of Slovakia
- CIEMAT
- EELA
- Ministerio de Educacion y Ciencia of Spain
- Xunta de Galicia (Conselleria de Educacion)
- CEADEN
- Cubaenergia, Cuba
- IAEA (International Atomic Energy Agency)
- Ministry of Science and Technology
- National Research Foundation (NRF), South Africa
- Swedish Reseach Council (VR)
- Knut & Alice Wallenberg Foundation (KAW)
- Ukraine Ministry of Education and Science
- United Kingdom Science and Technology Facilities Council (STFC)
- United States Department of Energy
- United States National Science Foundation
- State of Texas
- State of Ohio
- STFC [ST/F011989/1] Funding Source: UKRI
- Science and Technology Facilities Council [GRIDPP, ST/F011989/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Physics [0969966] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [20224014, 23244055] Funding Source: KAKEN
Ask authors/readers for more resources
Inclusive transverse momentum spectra of primary charged particles in Pb-Pb collisions at root s(NN) = 2.76 TeV have been measured by the ALICE Collaboration at the LHC. The data are presented for central and peripheral collisions, corresponding to 0-5% and 70-80% of the hadronic Pb-Pb cross section. The measured charged particle spectra in |eta| < 0.8 and 0.3 < p(T) < 20 GeV/c are compared to the expectation in pp collisions at the same root s(NN), scaled by the number of underlying nucleon-nucleon collisions. The comparison is expressed in terms of the nuclear modification factor R-AA. The result indicates only weak medium effects (R-AA approximate to 0.7) in peripheral collisions. In central collisions, R-AA reaches a minimum of about 0.14 at p(T) = 6-7 GeV/c and increases significantly at larger p(T). The measured suppression of high-p(T) particles is stronger than that observed at lower collision energies, indicating that a very dense medium is formed in central Pb-Pb collisions at the LHC. (C) 2010 CERN. Published by Elsevier B.V. All rights reserved.
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