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Measurement of charged particle multiplicities in pp collisions at √s = 7 TeV in the forward region

  • Author(s): Aaij, R
  • Beteta, CA
  • Adeva, B
  • Adinolfi, M
  • Adrover, C
  • Affolder, A
  • Ajaltouni, Z
  • Albrecht, J
  • Alessio, F
  • Alexander, M
  • Alkhazov, G
  • Cartelle, PA
  • Alves, AA
  • Amato, S
  • Amhis, Y
  • Anderson, J
  • Appleby, RB
  • Gutierrez, OA
  • Archilli, F
  • Arrabito, L
  • Artamonov, A
  • Artuso, M
  • Aslanides, E
  • Auriemma, G
  • Bachmann, S
  • Back, JJ
  • Bailey, DS
  • Balagura, V
  • Baldini, W
  • Barlow, RJ
  • Barschel, C
  • Barsuk, S
  • Barter, W
  • Bates, A
  • Bauer, C
  • Bauer, T
  • Bay, A
  • Bediaga, I
  • Belogurov, S
  • Belous, K
  • Belyaev, I
  • Ben-Haim, E
  • Benayoun, M
  • Bencivenni, G
  • Benson, S
  • Benton, J
  • Bernet, R
  • Bettler, MO
  • Van Beuzekom, M
  • Bien, A
  • Bifani, S
  • Bird, T
  • Bizzeti, A
  • Bjørnstad, PM
  • Blake, T
  • Blanc, F
  • Blanks, C
  • Blouw, J
  • Blusk, S
  • Bobrov, A
  • Bocci, V
  • Bondar, A
  • Bondar, N
  • Bonivento, W
  • Borghi, S
  • Borgia, A
  • Bowcock, TJV
  • Bozzi, C
  • Brambach, T
  • Van Den Brand, J
  • Bressieux, J
  • Brett, D
  • Britsch, M
  • Britton, T
  • Brook, NH
  • Brown, H
  • Büchler-Germann, A
  • Burducea, I
  • Bursche, A
  • Buytaert, J
  • Cadeddu, S
  • Callot, O
  • Calvi, M
  • Gomez, MC
  • Camboni, A
  • Campana, P
  • Carbone, A
  • et al.
Abstract

© 2012, CERN for the benefit of the LHCb collaboration. 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.

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