Charged-particle multiplicities in pp interactions at root s=900 GeV measured with the ATLAS detector at the LHC ATLAS Collaboration
Popovic, D. S.
Sijacki, D. J.
Vranješ Milosavljević, Marija
ATLAS Collaboration (ukupan broj autora: 3221)
MetadataShow full item record
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 LT 2.5 and p(T) GT 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.
Keywords:Charged-particle / Multiplicities / 900 GeV / ATLAS / LHC / Minimum bias
Source:Physics Letters B, 2010, 688, 1, 21-42
- 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 and 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, Germany, 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