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Measurement of ϒ production in pp collisions at √s =7 TeV

  • 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
  • De Bruyn, K
  • 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. The production of ϒ (1S), ϒ (2S) and ϒ (3S) mesons in proton-proton collisions at the centre-of-mass energy of √s = 7 TeV is studied with the LHCb detector. The analysis is based on a data sample of 25 pb−1 collected at the Large Hadron Collider. The ϒ mesons are reconstructed in the decay mode ϒ →μ + μ and the signal yields are extracted from a fit to the μ + μ invariant mass distributions. The differential production cross-sections times dimuon branching fractions are measured as a function of the ϒ transverse momentum pT and rapidity y, over the range pT < 15 GeV/c and 2.0+ μ ) = 2.29 ± 0.01 ± 0.10+0.19−0.37 nb, σ(pp→ϒ (2S)X)×B(ϒ (2S)→μ + μ ) = 0.562±0.007±0.023+0.048−0.092 nb, σ(pp→ϒ (3S)X)×B(ϒ (3S)→μ + μ ) = 0.283±0.005±0.012+0.025−0.048 nb, where the first uncertainty is statistical, the second systematic and the third is due to the unknown polarisation of the three ϒ states.

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