Measurement of the ratio of branching fractions B(B±→J/ ψπ±)/B(B±→J/ψK±)

We report a measurement of the ratio of branching fractions of the decays B±→J/ψπ± and B±→J/ψK± using the CDF II detector at the Fermilab Tevatron Collider. The signal from the Cabbibo-suppressed B±→J/ψπ± decay is separated from B±→J/ψK± using the B±→J/ψK± invariant mass distribution and the kinemat...

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Detalles Bibliográficos
Autores: Abulencia, A., Cuevas, Javier, Gómez, Gervasio, Gómez-Ceballos, Guillelmo, Menzemer, Stephanie, Palencia, Enrique, Rodrigo Anoro, Teresa, Scodellaro, Luca, Vila, Iván, Vilar Cortabitarte, R., Cabrera, Susana, Zucchelli, S., CDF Collaboration
Tipo de recurso: artículo
Fecha de publicación:2009
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/226726
Acceso en línea:http://hdl.handle.net/10261/226726
Access Level:acceso abierto
Palabra clave:ddc:500.2
Descripción
Sumario:We report a measurement of the ratio of branching fractions of the decays B±→J/ψπ± and B±→J/ψK± using the CDF II detector at the Fermilab Tevatron Collider. The signal from the Cabbibo-suppressed B±→J/ψπ± decay is separated from B±→J/ψK± using the B±→J/ψK± invariant mass distribution and the kinematical differences of the hadron track in the two decay modes. From a sample of 220pb-1 of pp̄ collisions at s=1.96TeV, we observe 91±15 B±→J/ψπ± events together with 1883±34 B±→J/ψK± events. The ratio of branching fractions is found to be B(B±→J/ψπ±)/ B(B±→J/ψK±)=(4.86±0.82(stat)±0.15(syst))%. © 2009 The American Physical Society.

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