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Charged-particle multiplicities in pp interactions at √s=900 GeV measured with the ATLAS detector at the LHC

CollaborationWith : Abdelalim Aly, Ahmed Aly / Alexandre, Gauthier / Backes, Moritz / Bell, Paul / Bell, William / Berglund, Frida Elina / Blondel, Alain / Bonino, Roberto / Bucci, Francesca / Clark, Allan Geoffrey / Couyoumtzelis, Christian / Dao, Valerio / Diaz-Gomez, Manuel / Efthymiopoulos, Ilias / Ferrere, Didier / Gadomski, Szymon / Garcia Navarro, Jose Enrique / Gaumer, Olivier / Gonzalez Sevilla, Sergio / Goulette, Marc / Guescini, Francesco / Hamilton, Andrew / Kambara, Hisanori / Keil, Markus / Leger, Annie / Lister, Alison / Macina-Buono, Daniela / Mangin-Brinet, Mariane / Martin Dit Latour, Bertrand / Mazzucato, Federica / Mikulec, Bettina / Moneta, Lorenzo / Mora Herrera, Maria Clemencia Rosario / Morone, Maria Cristina / Nektarijevic, Snezana / Orellana, Frédérik / Pasztor, Arpad / Pohl, Martin / Robichaud-Veronneau, Andrée / Rosselet, Laurent / Urquijo, Phillip / Vuaridel, Bertrand / Wu, Xin
Published in Physics Letters. B. 2010, vol. 688, no. 1, p. 21-42
Abstract 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 |η|<2.5|η|<2.5 and pT>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 at η=0 is measured to be 1.333±0.003(stat.)±0.040(syst.), which is 5–15% higher than the Monte Carlo models predict.
Keywords Charged-particleMultiplicities900 GeVATLASLHCMinimum bias
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ATLAS COLLABORATION. Charged-particle multiplicities in pp interactions at √s=900 GeV measured with the ATLAS detector at the LHC. In: Physics Letters. B, 2010, vol. 688, n° 1, p. 21-42. https://archive-ouverte.unige.ch/unige:42099

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Deposited on : 2014-11-21

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