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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
DOI:	10.1016/j.physletb.2010.03.064
ISSN:	0370-2693
Appears in Collections:	(IFIC) Artículos