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Title:	Measurement of charged particle multiplicities in pp collisions at t √s =7 TeV in the forward region
Author:	Abellan Beteta, Carlos; Calvo Gómez, Míriam; Camboni, Alessandro; Comerma Montells, Albert; Domingo Bonal, Francesc; Garrido Beltrán, Lluís; Gascón Fora, David; Grabalosa Gándara, Marc; Graciani Díaz, Ricardo; Graugés Pous, Eugeni; López Asamar, Elias; Musy, Marco; Pérez-Calero Yzquierdo, A.; Picatoste Olloqui, Eduardo; Pie Valls, B. (Blai); Potterat, Cédric; Puig Navarro, Albert; Roselló, M.; Ruiz, Hugo (Ruiz Pérez); Vázquez Gómez, Ricard; Vilasis-Cardona, Xavier; LHCb Collaboration
Other authors:	Universitat de Barcelona
Abstract:	Charged particle production in proton-proton collisions is studied with the LHCb detector at a centre-of-mass energy of √s = 7 TeV in different intervals of pseudorapidity η. Charged particles are reconstructed close to the interaction region in the vertex detector, which provides high reconstruction efficiency in the η ranges −2.5 <η< −2.0 and 2.0 <η< 4.5. The data were taken with a minimum bias trigger, only requiring one or more reconstructed tracks in the vertex detector. By selecting an event sample with at least one track with a transverse momentum greater than 1 GeV/c a hard QCD subsample is investigated. Several event generators are compared with the data; none are able to describe fully the multiplicity distributions or the charged particle density distribution as a function of η. In general, the models underestimate charged particle production.
Subject(s):	-Teoria quàntica de camps -Gravitació -Relativitat (Física) -Teoria quàntica -Hadrons -Quantum field theory -Gravitation -Relativity (Physics) -Quantum theory -Hadrons
Rights:	cc by (c) LHCb collaboration, 2012 http://creativecommons.org/licenses/by/3.0/es/
Document type:	Article Article - Published version
Published by:	Società Italiana di Fisica & Springer Verlag
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