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

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

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	ATLAS Collaboration; Salt Cairols, José Perfil; Higón Rodríguez, Emilio Perfil; González de la Hoz, Santiago Perfil; Castillo Giménez, María Victoria Perfil; Ferrer Soria, Antonio Perfil; Sanchis Lozano, Miguel Ángel; Hernández Jiménez, Yesenia; Ros Martínez, Eduardo; García García, Carmen Perfil; Fuster Verdú, Juan A. Perfil; Martí García, Salvador; Lacasta Llácer, Carlos; Valls Ferrer, Juan Antonio; Villaplana Pérez, Miguel
	This document is a artículoDate2010
	Este documento está disponible también en : http://dx.doi.org/10.1016/j.physletb.2010.03.064
	Este documento está disponible también en : http://hdl.handle.net/10550/35361
	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 |eta|<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 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.
	The Atlas Collaboration Salt Cairols, Carlos Higón Rodríguez, Emilio González d ela Hoz, Santiago Castillo Giménez, María Victoria Ferrer Soria, Antonio Sanchis Lozano, Migel Angel Hernández Jiménez, Yesenia Ros Martínez, Eduardo García García, Carmen Fuster Verdú, Juan A. Martí García, Salvador Lacasta Llácer, Carlos Valls Ferrer, Jua Antonio Villaplana Pérez, Miguel 2010 Charged-particle multiplicities in pp interactions at root s=900 GeV measured with the ATLAS detector at the LHC Physics Letters B 688 1 21 42
	http://dx.doi.org/10.1016/j.physletb.2010.03.064

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