Charged particle production in proton-proton collisions is studied with the LHCb detector at a centre-of-mass energy of 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.
Measurement of charged particle multiplicities in pp collisions at $\sqrt{s} =7~\mbox{TeV}$ in the forward region
Cardinale, R.;Fontanelli, F.;Patrignani, C.;Petrolini, A.;Sannino, M.;
2012-01-01
Abstract
Charged particle production in proton-proton collisions is studied with the LHCb detector at a centre-of-mass energy of 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.
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