Measurement of ψ(2S) meson 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 differential cross-section for the inclusive production of ψ(2S) mesons in pp collisions at √s = 7 TeV has been measured with the LHCb detector. The data sample corresponds to an integrated luminosity of 36 pb−1. The ψ(2S) mesons are reconstructed in the decay channels ψ(2S)→μ + μ − and ψ(2S)→J/ψπ + π −, with the J/ψ meson decaying into two muons. Results are presented both for promptly produced ψ(2S) mesons and for those originating from b-hadron decays. In the kinematic range pT(ψ(2S)) ≤ 16 GeV/c and 2 l y(ψ(2S)) ≤ 4.5 we measure σprompt(ψ(2S)) = 1.44 ± 0.01 (stat) ± 0.12 (syst) +0.20−0.40 (pol) μb, σb(ψ(2S)) = 0.25 ± 0.01 (stat) ± 0.02 (syst) μb, where the last uncertainty on the prompt cross-section is due to the unknown ψ(2S) polarization. Recent QCD calculations are found to be in good agreement with our measurements. Combining the present result with the LHCb J/ψ measurements we determine the inclusive branching fraction B(b→ψ(2S)X) = (2.73 ± 0.06 (stat) ± 0.16 (syst) ± 0.24 (BF)) × 10−3, where the last uncertainty is due to the B(b → J/ψX), B(J/ψ →μ + μ −) and B(ψ(2S)→e + e −) branching fraction uncertainties.