Journal
PHYSICS LETTERS B
Volume 726, Issue 4-5, Pages 610-622Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2013.09.022
Keywords
LHC; Heavy-ion collisions; Charged-particle density; Wide rapidity coverage
Funding
- State Committee of Science
- World Federation of Scientists (WFS)
- 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's Seventh Framework Programme
- Helsinki Institute of Physics
- Academy of Finland
- French CNRS-IN2P3
- Region Pays de Loire
- Region Alsace
- Region Auvergne
- CEA, France
- German BMBF
- Helmholtz Association
- General Secretariat for Research and Technology, Ministry of Development, Greece
- 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)
- Centro Fermi Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Italy
- MEXT, Japan
- Joint Institute for Nuclear Research, Dubna
- National Research Foundation of Korea (NRF)
- CONACYT
- DGAPA, Mexico
- ALFA-EC
- EPLANET Program (European Particle Physics Latin American 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
- Scientific Research NASR (Autoritatea Nationala pentru Cercetare tiincifica ANCS)
- Ministry of Education and Science of Russian Federation
- Russian Academy of Sciences
- Russian Federal Agency of Atomic Energy
- Russian Federal Agency for Science and Innovations
- Russian Foundation for Basic Research
- Ministry of Education of Slovakia
- Department of Science and Technology, South Africa
- CIEMAT
- EELA
- Ministerio de Economia y Competitividad (MINECO) of Spain
- Xunta de Galicia (Conselleria de Educacion)
- CEADEN
- Cubaenergia
- Cuba
- IAEA (International Atomic Energy Agency)
- Swedish Research 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
- Direct For Mathematical & Physical Scien
- Division Of Physics [0969966, 1305280, 1307461] 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 [23340074, 23244055, 25287048] Funding Source: KAKEN
- Science and Technology Facilities Council [ST/J000140/1, ST/J000108/1, ST/J000094/1] Funding Source: researchfish
- STFC [ST/J000094/1, ST/J000140/1, ST/J000108/1] Funding Source: UKRI
Ask authors/readers for more resources
We present the first wide-range measurement of the charged-particle pseudorapidity density distribution, for different centralities (the 0-5%, 5-10%, 10-20%, and 20-30% most central events) in Pb-Pb collisions at root s(NN) = 2.76 TeV at the LHC. The measurement is performed using the full coverage of the ALICE detectors, -5.0 < eta < 5.5, and employing a special analysis technique based on collisions arising from LHC 'satellite' bunches. We present the pseudorapidity density as a function of the number of participating nucleons as well as an extrapolation to the total number of produced charged particles (N-ch = 17165 +/- 772 for the 0-5% most central collisions). From the measured dN(ch)/d eta distribution we derive the rapidity density distribution, dN(ch)/dy, under simple assumptions. The rapidity density distribution is found to be significantly wider than the predictions of the Landau model. We assess the validity of longitudinal scaling by comparing to lower energy results from RHIC. Finally the mechanisms of the underlying particle production are discussed based on a comparison with various theoretical models. (C) 2013 CERN. Published by Elsevier B.V. All rights reserved.
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