期刊
EUROPEAN PHYSICAL JOURNAL C
卷 68, 期 1-2, 页码 89-108出版社
SPRINGER
DOI: 10.1140/epjc/s10052-010-1339-x
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资金
- Calouste Gulbenkian Foundation from 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 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
- 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
- Korea Foundation for International Cooperation of Science and Technology (KICOS)
- 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 (Autontatea 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)
- 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
- 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
Charged-particle production was studied in proton-proton collisions collected at the LHC with the ALICE detector at centre-of-mass energies 0.9 TeV and 2.36 TeV in the pseudorapidity range vertical bar eta vertical bar < 1.4. In the central region (vertical bar eta vertical bar < 0.5), at 0.9 TeV, we measure charged-particle pseudo-rapidity density dN(ch)/d eta = 3.02 +/- 0.01(stat.)(-0.05)(+0.08)(syst.) for inelastic interactions, and dN(ch)/d eta = 3.58 +/- 0.01 (stat.)(-0.12)(+0.12)(syst.) for non-single-diffractive interactions. At 2.36 TeV, we find dN(ch)/d eta = 3.77 +/- 0.01(stat.)(-0.12)(+0.25)(syst.) for inelastic, and dN(ch)/d eta = 4.43 +/- 0.01(stat.)(-0.12)(+0.17)(syst.) for non-single-diffractive collisions. The relative increase in charged-particle multiplicity from the lower to higher energy is 24.7% +/- 0.5%(stat.)(-2.8)(+5.7)%(syst.) for inelastic and 23.7% +/- 0.5%(stat.)(-1.1)(+4.6)%(syst.) for non-single-diffractive interactions. This increase is consistent with that reported by the CMS collaboration for non-single-diffractive events and larger than that found by a number of commonly used models. The multiplicity distribution was measured in different pseudorapidity intervals and studied in terms of KNO variables at both energies. The results are compared to proton-antiproton data and to model predictions.
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