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Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/27707
Title: Charged-particle multiplicities in pp interactions at root s=900 GeV measured with the ATLAS detector at the LHC
Authors: Aad, G.; Amorós, Gabriel; Cabrera, Susana; Castillo, Mª Victoria; Costa, María José; Escobar, Carlos; Ferrer, Antonio; Fuster, Juan; García García, Carmen; González de la Hoz, Santiago; Hernández Jiménez, Yesenia; Higón, Emilio; Irles Quiles, Adrián; Kaci, Mohamed; Lacasta Llácer, Carlos; Lacuesta, Vicente; Martí García, Salvador; Miñano, Mercedes; Mitsou, Vasiliki A.; Moles Valls, Regina; Moreno Llácer, María; Oliver García, Elena; Pérez García-Estañ, María Teresa; Ros, Eduardo; Salt, José; Sánchez Martínez, Javier; Sanchís Lozano, Miguel Ángel; Solans, Carlos; Torró Pastor, Emma; Valladolid Gallego, Eva; Valls Ferrer, Juan Antonio; Villaplana Pérez, Miguel; Vos, Marcel; Wildauer, Andreas; ATLAS Collaboration
Issue Date: 26-Apr-2010
Publisher: Elsevier
Citation: Physics Letters - Section B 688 (1): 21-42 (2010)
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 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.
Description: 22 páginas, 4 figuras, 1 tabla.-- et al.(ATLAS Collaboration).-- arXiv:1003.3124v2
Publisher version (URL): http://dx.doi.org/10.1016/j.physletb.2010.03.064
URI: http://hdl.handle.net/10261/27707
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2010.03.064
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