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Aaij, R; Abellan Beteta, C; Adeva, B; Adinolfi, M; Adrover, C; Affolder, A; Ajaltouni, Z; Albrecht, J; Alessio, F; Alexander, M; Alkhazov, G; Alvarez Cartelle, P; Alves, A A; Amato, S; Amhis, Y; Anderson, J; Appleby, R B; Aquines Gutierrez, O; Archilli, F; Arrabito, L; Artamonov, A; Artuso, M; Aslanides, E; Auriemma, G; Bachmann, S; Back, J J; Bailey, D S; Balagura, V; Baldini, W; Barlow, R J; Barschel, C; Barsuk, S; Barter, W; Bates, A; Bauer, C; Bauer, Th; Bay, A; Bediaga, I; Belogurov, S; Belous, K; Belyaev, I; Ben-Haim, E; Benayoun, M; Bencivenni, G; Benson, S; Benton, J; Bernet, R; Bettler, M-O; van Beuzekom, M; Bien, A
Physics letters. B, 08/2012, Letnik: 714, Številka: 2-5Journal Article
The prompt production of the charmonium I c 1 and I c 2 mesons has been studied in proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of s = 7 TeV . The I c mesons are identified through their decays I c a J / I gamma with J / I a mu + mu a using 36 pb a 1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for the two I c spin states, I ( I c 2 ) / I ( I c 1 ) , has been determined as a function of the J / I transverse momentum, p T J / I , in the range from 2 to 15 GeV/c. The results are in agreement with the next-to-leading order non-relativistic QCD model at high p T J / I and lie consistently above the pure leading-order colour-singlet prediction.
