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  • P Alvarez Cartelle; Amato, S; Andrews, J E; Aslanides, E; Bediaga, I; Bel, L J; Belin, S; Bertholet, E; Betancourt, C; Bezshyiko, Ia; Billoir, P; Bocci, V; Borsato, M; Buonaura, A; Byczynski, W; Cai, H; M Calvo Gomez; Camboni, A; Carniti, P; Charles, M; Closier, J; Cogneras, E; Cojocariu, L; Currie, R; De Paula, L; H-P Dembinski; A Dosil Suárez; Dzhelyadin, R; Federici, L; Fini, R A; Gallorini, S; Garcia Martin, L M; B Garcia Plana; Gascon, D; Gaspar, C; Ghez, Ph; Girard, O G; P Gironella Gironell; Gotti, C; Granado Cardoso, L A; Graverini, E; Gruber, L; J He; Hennessy, K; Henry, L; Heuel, J; Hill, D; W Hu; Hushchyn, M; Kirn, T; Kozeiha, M; Krokovny, P; Kucharczyk, M; Lai, A; Longstaff, I; Mackowiak, P; Maguire, K; Malde, S; Malinin, A; Maurice, E; Mead, J V; Meadows, B; Merk, M; Muheim, F; Neubert, S; Nieswand, S; D P O’Hanlon; Pais, P R; Pajero, T; Pili, M; Placinta, V; Playfer, S; Qian, W; Rama, M; Reboud, M; Richards, S; Roehrken, M; Ruf, T; Santimaria, M; Satriano, C; Schune, M H; Schwemmer, R; Serrano, J; Soler, F J P; Souza De Paula, B; Stagni, F; Stenyakin, O; Stocchi, A; Straticiuc, M; Teubert, F; Tilley, M J; Tisserand, V; Tomassetti, L; Vernet, M; Williams, M; Witek, M; Yushchenko, O; Zarebski, K A; Zhang, L; Zucchelli, S

    The journal of high energy physics, 11/2018, Letnik: 2018, Številka: 11
    Journal Article

    The production of ϒ(nS) mesons (n = 1, 2, 3) in pPb and Pbp collisions at a centre-of-mass energy per nucleon pair sNN=8.16\ \sqrt{s_{\mathrm{NN}}}=8.16 \ TeV is measured by the LHCb experiment, using a data sample corresponding to an integrated luminosity of 31.8 nb−1. The ϒ(nS) mesons are reconstructed through their decays into two opposite-sign muons. The measurements comprise the differential production cross-sections of the ϒ(1S) and ϒ(2S) states, their forward-to-backward ratios and nuclear modification factors. The measurements are performed as a function of the transverse momentum pT and rapidity in the nucleon-nucleon centre-of-mass frame y* of the ϒ(nS) states, in the kinematic range pT < 25 GeV/c and 1.5 < y* < 4.0 (−5.0 < y* < −2.5) for pPb (Pbp) collisions. In addition, production cross-sections for ϒ(3S) are measured integrated over phase space and the production ratios between all three ϒ(nS) states are determined. Suppression for bottomonium in proton-lead collisions is observed, which is particularly visible in the ratios. The results are compared to theoretical models.