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Chatrchyan, S; Khachatryan, V; Sirunyan, A M; Tumasyan, A; Adam, W; Bergauer, T; Dragicevic, M; Eroe, J; Fabjan, C; Friedl, M; Fruehwirth, R; Ghete, V M; Hammer, J; Hoermann, N; Hrubec, J; Jeitler, M; Kiesenhofer, W; Knuenz, V; Krammer, M; Liko, D; Mikulec, I; Pernicka, M; Rahbaran, B; Rohringer, C; Rohringer, H; Schoefbeck, R; Strauss, J; Taurok, A; Wagner, P; Waltenberger, W; Walzel, G; Widl, E; Wulz, C-E; Mossolov, V; Shumeiko, N; Suarez Gonzalez, J; Bansal, S; Cornelis, T; De Wolf, EA; Janssen, X; Luyckx, S; Maes, T; Mucibello, L; Ochesanu, S; Roland, B; Rougny, R; Selvaggi, M; Staykova, Z; Van Haevermaet, H; Van Mechelen, P
Physics letters. B, 08/2012, Letnik: 714, Številka: 2-5Journal Article
The I b differential production cross section and the cross section ratio I ( I A= b ) / I ( I b ) are measured as functions of transverse momentum p T I b and rapidity | y I b | in p p collisions at s = 7 TeV using data collected by the CMS experiment at the LHC. The measurements are based on I b decays reconstructed in the exclusive final state J / I I , with the subsequent decays J / I a mu + mu a and I a p I , using a data sample corresponding to an integrated luminosity of 1.9 fb a 1 . The product I ( I b ) X B ( I b a J / I I ) versus p T I b falls faster than that of b mesons. The measured value of I ( I b ) X B ( I b a J / I I ) for p T I b > 10 GeV and | y I b | < 2.0 is 1.16 +/- 0.06 +/- 0.12 nb , and the integrated I ( I A= b ) / I ( I b ) ratio is 1.02 +/- 0.07 +/- 0.09 , where the uncertainties are statistical and systematic, respectively.
