期刊
PHYSICS LETTERS B
卷 688, 期 1, 页码 21-42出版社
ELSEVIER
DOI: 10.1016/j.physletb.2010.03.064
关键词
Charged-particle; Multiplicities; 900 GeV; ATLAS; LHC; Minimum bias
资金
- ANPCyT, Argentina
- Yerevan Physics Institute, Armenia
- ARC and DEST, Australia
- Bundesministerium fur Wissenschaft und Forschung, Austria
- National Academy of Sciences of Azerbaijan
- State Committee on Science & Technologies of the Republic of Belarus
- CNPq
- FINEP, Brazil
- NSERC
- NRC
- CFI, Canada
- CERN
- CONICYT, Chile
- NSFC, China
- COLCIENCIAS, Colombia
- Ministry of Education, Youth and Sports of the Czech Republic
- Ministry of Industry and Trade of the Czech Republic
- Committee for Collaboration of the Czech Republic with CERN
- Danish Natural Science Research Council
- Lundbeck Foundation
- European Commission, through the ARTEMIS Research Training Network
- IN2P3-CNRS
- Dapnia-CEA, France
- Georgian Academy of Sciences
- BMBF
- HGF
- DFG
- MPG, Germany
- Ministry of Education and Religion
- GSRT, Greece
- ISF
- MINERVA
- CIF
- DIP
- Benoziyo Center, Israel
- INFN, Italy
- MEXT, Japan
- CNRST, Morocco
- FOM
- NWO, Netherlands
- The Research Council of Norway
- Ministry of Science and Higher Education, Poland
- GRICES
- FCT, Portugal
- Ministry of Education and Research, Romania
- Ministry of Education and Science of the Russian Federation
- State Atomic Energy Corporation Rosatom
- JINR
- Ministry of Science, Serbia
- Department of International Science and Technology Cooperation, Ministry of Education of the Slovak Republic
- Slovenian Research Agency, Ministry of Higher Education, Science and Technology, Slovenia
- Ministerio de Educacion y Ciencia, Spain
- Swedish Research Council
- Knut and Alice Wallenberg Foundation, Sweden
- State Secretariat for Education and Science
- Swiss National Science Foundation
- Cantons of Bern and Geneva, Switzerland
- National Science Council, Taiwan
- TAEK, Turkey
- Science and Technology Facilities Council
- Leverhulme Trust, United Kingdom
- DOE
- NSF, United States of America
- STFC [ST/H000887/2, ST/G502320/1, PP/E000487/1, ST/I006080/1, ST/F00754X/1, ST/H001093/1, ST/H001166/1, ST/H001026/1, ST/K000640/1, ST/F007418/1, ST/H000887/1, ST/H00095X/1, ST/F007337/1, PP/E003699/2, ST/F007450/1, ST/H00095X/2, PP/E003087/1, ST/I000186/1, ST/H001077/1, ST/I505756/1, ST/H001093/2, PP/E003699/1, ST/H001026/2, ST/H001034/1, ST/G009457/1, PP/E006388/1, PP/E000347/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/E000347/1, ST/H001093/1, ST/H001166/1, ST/H00095X/2, ST/G009457/1, ST/F007450/1, ST/H000887/2, ST/H000887/1, PP/E000487/1, ST/H001026/2, ST/H001026/1, PP/E003699/1, ST/G502320/1, ST/H00095X/1, ST/H001093/2, ATLAS, ST/F007418/1, ST/H001077/1, ST/F007337/1, PP/E006388/1, ST/I505756/1, GRIDPP, PP/E000444/1, ST/F00754X/1, PP/E003087/1, ST/I006080/1, ST/H001034/1, ST/I000186/1] Funding Source: researchfish
The first measurements from proton-proton collisions recorded with the ATLAS detector at the LHC are presented. Data were collected in December 2009 using a minimum-bias trigger during collisions at a centre-of-mass energy of 900 GeV. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity, and the relationship between mean transverse momentum and charged-particle multiplicity are measured for events with at least one charged particle in the kinematic range vertical bar eta vertical bar < 2.5 and p(T) > 500 MeV. The measurements are compared to Monte Carlo models of proton-proton collisions and to results from other experiments at the same centre-of-mass energy. The charged-particle multiplicity per event and unit of pseudorapidity eta = 0 is measured to be 1.333 +/- 0.003(stat.) +/- 0.040(syst.), which is 5-15% higher than the Monte Carlo models predict. 2010 Published by Elsevier B.V.
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