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

Journal article

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.

Authors: Abulencia, A; Adelman, J; Affolder, T; Akimoto, T; Albrow, MG

• Journal: Physical Review D
• Volume: 79
• Issue: 11
• Publication date: 2009-06-10
• DOI: 10.1103/PhysRevD.79.112003
• EISSN: 1550-2368
• ISSN: 1550-7998
• Language: English