Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.252301
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Funding
- Calouste Gulbenkian Foundation from Lisbon
- 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
- The European Research Council under the European Community
- Helsinki Institute of Physics
- Academy of Finland
- French CNRS
- Region Pays de Loire
- Region Alsace
- Region Auvergne
- CEA, France
- German BMBF
- Helmholtz Association
- Hungarian OTKA
- National Office for Research and Technology (NKTH)
- Department of Atomic Energy
- 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)
- The 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)
- The U. S. Department of Energy
- U. S. National Science Foundation
- State of Texas
- State of Ohio
- STFC [ST/F011989/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F011989/1, GRIDPP] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Physics [0969966] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [0968903] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [20224014] Funding Source: KAKEN
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The first measurement of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at a center-of-mass energy per nucleon pair root s(NN) = 2.76 TeV is presented. For an event sample corresponding to the most central 5% of the hadronic cross section, the pseudorapidity density of primary charged particles at midrapidity is 1584 +/- 4(stat) +/- 76(syst), which corresponds to 8.3 +/- 0.4(syst) per participating nucleon pair. This represents an increase of about a factor 1.9 relative to pp collisions at similar collision energies, and about a factor 2.2 to central Au-Au collisions at root s(NN) = 0.2 TeV. This measurement provides the first experimental constraint for models of nucleus-nucleus collisions at LHC energies.
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