Measurement of ϒ production in pp collisions at [Formula: see text].

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; Bjornstad, 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; Buchler-Germann, A; Burducea, I; Bursche, A; Buytaert, J; Cadeddu, S; Callot, O; Calvi, M; Gomez, MC | 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 l 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.