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Measurement of J/ψ production in pp collisions at √S = 7 TeV

  • Author(s): Aaij, R;
  • Adeva, B;
  • Adinolfi, M;
  • Adrover, C;
  • Affolder, A;
  • Ajaltouni, Z;
  • Albrecht, J;
  • Alessio, F;
  • Alexander, M;
  • Cartelle, PA;
  • Alves, AA;
  • Amato, S;
  • Amhis, Y;
  • Amoraal, J;
  • Anderson, J;
  • Appleby, RB;
  • Gutierrez, OA;
  • Arrabito, L;
  • Artuso, M;
  • Aslanides, E;
  • Auriemma, G;
  • Bachmann, S;
  • Bailey, DS;
  • Balagura, V;
  • Baldini, W;
  • Barlow, RJ;
  • Barschel, C;
  • Barsuk, S;
  • Bates, A;
  • Bauer, C;
  • Bauer, T;
  • Bay, A;
  • Bediaga, I;
  • Belous, K;
  • Belyaev, I;
  • Ben-Haim, E;
  • Benayoun, M;
  • Bencivenni, G;
  • Bernet, R;
  • Bettler, MO;
  • Van Beuzekom, M;
  • Bifani, S;
  • 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;
  • Bos, E;
  • Bowcock, TJV;
  • Bozzi, C;
  • Brambach, T;
  • van den Brand, J;
  • Bressieux, J;
  • Brisbane, S;
  • Britsch, M;
  • Britton, T;
  • Brook, NH;
  • Brown, H;
  • Büchler-Germann, A;
  • Bursche, A;
  • Buytaert, J;
  • Cadeddu, S;
  • Carvajal, JMC;
  • Callot, O;
  • Calvi, M;
  • Calvogomez, M;
  • Camboni, A;
  • Campana, P;
  • Carbone, A;
  • Carboni, G;
  • Cardinale, R;
  • Cardini, A;
  • Carson, L;
  • Akiba, KC;
  • Casse, G;
  • Cattaneo, M;
  • Charles, M;
  • Charpentier, P;
  • Chiapolini, N;
  • Vidal, XC;
  • Clark, PJ;
  • Clarke, PEL;
  • Clemencic, M;
  • Cliff, HV;
  • Closier, J;
  • Coca, C;
  • Coco, V;
  • Cogan, J;
  • Collins, P;
  • Constantin, F;
  • Conti, G
  • et al.
Abstract

The production of J/ψ mesons in proton-proton collisions at √S = 7 TeV is studied with the LHCb detector at the LHC. The differential cross-section for prompt J/ψ production is measured as a function of the J/ψ transverse momentum pT and rapidity y in the fiducial region pT ∈ [0; 14] GeV/c and y ∈ [2.0; 4.5]. The differential cross-section and fraction of J/ψ from b-hadron decays are also measured in the same pT and y ranges. The analysis is based on a data sample corresponding to an integrated luminosity of 5.2 pb&-1. The measured cross-sections integrated over the fiducial region are 10.52 ± 0.04 ± 1.40+1.64 &-2.20 μb for prompt J/ψ production and 1.14 ± 0.01 ± 0.16 μb for J/ψ from b-hadron decays, where the first uncertainty is statistical and the second systematic. The prompt J/ψ production cross-section is obtained assuming no J/ψ polarisation and the third error indicates the acceptance uncertainty due to this assumption.

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