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oai:recercat.cat:2445/1317742025-12-04T21:31:21Zcom_2072_1057col_2072_478812col_2072_478822col_2072_478823col_2072_478904col_2072_478917

urn:hdl:2445/131774 Measurement of b hadron production fractions in 7 TeV pp collisions Abellan Beteta, Carlos Calvo Gómez, Míriam Camboni, Alessandro Comerma Montells, Albert Domingo Bonal, Francesc Garrido Beltrán, Lluís Gascón Fora, David Grabalosa Gándara, Marc Graciani Díaz, Ricardo Graugés Pous, Eugeni López Asamar, Elias Musy, Marco Pérez-Calero Yzquierdo, Antonio Picatoste Olloqui, Eduardo Pie Valls, B. (Blai) Potterat, Cédric Puig Navarro, Albert Roselló, M. Ruiz, Hugo (Ruiz Pérez) Vázquez Gómez, Ricard Vilasis-Cardona, Xavier LHCb Collaboration Física de partícules Experiments Col·lisions (Física) Hadrons Particle physics Experiments Collisions (Physics) Hadrons Measurements of b hadron production ratios in proton-proton collisions at a center-of-mass energy of 7 TeV with an integrated luminosity of 3     pb − 1 are presented. We study the ratios of strange B meson to light B meson production f s / ( f u + f d ) and Λ 0 b baryon to light B meson production f Λ b / ( f u + f d ) as a function of the charmed hadron-muon pair transverse momentum p T and the b hadron pseudorapidity η , for p T between 0 and 14 GeV and η between 2 and 5. We find that f s / ( f u + f d ) is consistent with being independent of p T and η , and we determine f s / ( f u + f d ) = 0.134 ± 0.004 + 0.011 − 0.010 , where the first error is statistical and the second systematic. The corresponding ratio f Λ b / ( f u + f d ) is found to be dependent upon the transverse momentum of the charmed hadron-muon pair, f Λ b / ( f u + f d ) = ( 0.404 ± 0.017 ( stat ) ± 0.027 ( syst ) ± 0.105 ( Br ) ) × [ 1 − ( 0.031 ± 0.004 ( stat ) ± 0.003 ( syst ) ) × p T ( GeV ) ] , where Br reflects an absolute scale uncertainty due to the poorly known branching fraction B ( Λ + c → p K − π + ) . We extract the ratio of strange B meson to light neutral B meson production f s / f d by averaging the result reported here with two previous measurements derived from the relative abundances of ¯¯¯ B 0 s → D + s π − to ¯¯¯ B 0 → D + K − and ¯¯¯ B 0 → D + π − . We obtain f s / f d = 0.267 + 0.021 − 0.020 . 2019-04-08T11:22:22Z 2019-04-08T11:22:22Z 2012-02-01 2019-04-08T11:22:22Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.85.032008 Physical Review D, 2012, vol. 85, num. 3, p. 032008 https://doi.org/10.1103/PhysRevD.85.032008 cc by (c) CERN; LHCb Collaboration, 2012 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)