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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;
  • Carboni, G;
  • Cardinale, R;
  • Cardini, A;
  • Carson, L;
  • Akiba, KC;
  • Casse, G;
  • Cattaneo, M;
  • Cauet, C;
  • Charles, M;
  • Charpentier, P;
  • Chiapolini, N;
  • Ciba, K;
  • Vidal, XC
  • et al.
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.

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