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Measurement of the fragmentation fraction ratio f s /f d and its dependence on B meson kinematics

By LHCb Collaboration, Carlos Abellan Beteta, M. Calvo Gómez, Alessandro Camboni, Albert Comerma Montells, F. Domingo Bonal, Lluís Garrido Beltrán, Ricardo Graciani Díaz, Eugeni Graugés Pous, E. Lopez Asamar, Antonio Pérez-Calero Yzquierdo, Eduardo Picatoste Olloqui, Cédric Potterat, Vicente José Rives Molina, Hugo (Ruiz Pérez) Ruiz, R. Vázquez Gómez and X. Vilasis-Cardona

Abstract

The relative production rate of B0s and B 0 mesons is determined with the hadronic decays B0s→D−sπ+ and B 0 → D − K +. The measurement uses data corresponding to 1.0 fb−1 of pp collisions at a centre-of-mass energy of s√=7 TeV recorded in the forward region with the LHCb experiment. The ratio of production rates, f s /f d , is measured to be 0.238 ± 0.004 ± 0.015 ± 0.021, where the first uncertainty is statistical, the second systematic, and the third theoretical. This is combined with a previous LHCb measurement to obtain f s /f d  = 0.256 ± 0.020. The dependence of f s /f d on the transverse momentum and pseudorapidity of the B meson is determined using the decays B0s→D−sπ+ and B 0 → D −π+. There is evidence for a decrease with increasing transverse momentum, whereas the ratio remains constant as a function of pseudorapidity. In addition, the ratio of branching fractions of the decays B 0 → D − K + and B 0 → D −π+ is measured to be 0.0822 ± 0.0011 (stat) ± 0.0025 (syst)

Topics: Hadrons, Gran Col·lisionador d'Hadrons, Teoria quàntica de camps, Gravitació, Relativitat (Física), Hadrons, Large Hadron Collider (France and Switzerland), Quantum field theory, Gravitation, Relativity (Physics)
Publisher: Società Italiana di Fisica & Springer Verlag
Year: 2014
DOI identifier: 10.1007/JHEP04(2013)001
OAI identifier: oai:diposit.ub.edu:2445/58757
Journal:

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