Measurements of B+c Production and Mass with the B+c→J/ψπ+ Decay

Measurements of B + c production and mass are performed with the decay mode B + c → J / ψ π + using 0.37     fb − 1 of data collected in p p collisions at √ s = 7     TeV by the LHCb experiment. The ratio of the production cross section times branching fraction between the B + c → J / ψ π + and the...

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Bibliographic Details
Published in:Physical review letters 2012-12
Main Authors: Abellan Beteta, Carlos, Calvo Gómez, Míriam, Camboni, Alessandro, Comerma Montells, Albert, Domingo Bonal, Francesc, Garrido Beltrán, Lluís, Grabalosa Gándara, Marc, Graciani Díaz, Ricardo, Graugés Pous, Eugeni, López Asamar, Elias, Pérez-Calero Yzquierdo, Antonio, Picatoste Olloqui, Eduardo, Pie Valls, B. (Blai), Potterat, Cédric, Rives Molina, Vicente José, Ruiz, Hugo (Ruiz Pérez), Vázquez Gómez, Ricard, Vilasis-Cardona, Xavier, LHCb Collaboration
Format: Article
Language:English
Subjects:
Experiments
Física de partícules
Particle physics
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Summary:Measurements of B + c production and mass are performed with the decay mode B + c → J / ψ π + using 0.37     fb − 1 of data collected in p p collisions at √ s = 7     TeV by the LHCb experiment. The ratio of the production cross section times branching fraction between the B + c → J / ψ π + and the B + → J / ψ K + decays is measured to be ( 0.68 ± 0.10 ( stat ) ± 0.03 ( syst ) ± 0.05 ( lifetime ) ) % for B + c and B + mesons with transverse momenta p T > 4     GeV / c and pseudorapidities 2.5 < η < 4.5 . The B + c mass is directly measured to be 6273.7 ± 1.3 ( stat ) ± 1.6 ( syst )     MeV / c 2 , and the measured mass difference with respect to the B + meson is M ( B + c ) − M ( B + ) = 994.6 ± 1.3 ( stat ) ± 0.6 ( syst )     MeV / c 2 .
ISSN:0031-9007