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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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