723 articles – 3224 Notices  [english version]
 HAL : in2p3-00705907, version 1
 arXiv : 1112.4592
 European Physical Journal C: Particles and Fields 72 (2012) 1947
 Measurement of charged particle multiplicities in $pp$ collisions at ${\sqrt{s} =7}$TeV in the forward region
 LHCb Collaboration(s)
 (2012)
 The charged particle production in proton-proton collisions is studied with the LHCb detector at a centre-of-mass energy of ${\sqrt{s} =7}$TeV in different intervals of pseudorapidity $\eta$. The charged particles are reconstructed close to the interaction region in the vertex detector, which provides high reconstruction efficiency in the $\eta$ ranges $-2.5<\eta<-2.0$ and $2.0<\eta<4.5$. 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 $\eta$. In general, the models underestimate the charged particle production.
 Thème(s) : Physique/Physique des Hautes Energies - Expérience
 Lien vers le texte intégral : http://fr.arXiv.org/abs/1112.4592
 in2p3-00705907, version 1 http://hal.in2p3.fr/in2p3-00705907 oai:hal.in2p3.fr:in2p3-00705907 Contributeur : Françoise Marechal <> Soumis le : Vendredi 8 Juin 2012, 14:57:10 Dernière modification le : Lundi 11 Juin 2012, 15:30:52