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Phys. Rev. Lett. 77, 5176 - 5181 (1996)

Measurement of the Branching Fraction B(Bu+→J/ψπ+) and Search for Bc+→J/ψπ+

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F. Abe et al. (CDF Collaboration)
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Received 9 September 1996

We report on a measurement of the branching fraction of the Cabibbo-suppressed decay Bu+→J/ψπ+, where J/ψ→μ+μ-. The data were collected by the Collider Detector at Fermilab during 1992–1995 and correspond to an integrated luminosity of 110 pb-1 in p̅ p collisions at sqrt[s]  =  1.8  TeV. A signal of 28-9+10 events is observed and we determine the ratio of branching fractions B(Bu+→J/ψπ+)/B(Bu+→J/ψK+) to be [5.0-1.7+1.9(stat)±0.1(syst)]%. Using the world average value for B(Bu+→J/ψK+), we calculate the branching fraction B(Bu+→J/ψπ+) to be (5.0-1.9+2.1)×10-5. We also search for the decay Bc+→J/ψπ+ and report a 95% confidence level limit on σ(Bc+)B(Bc+→J/ψπ+)/σ(Bu+)B(Bu+→J/ψK+) as a function of the Bc+ lifetime.


©1996 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.77.5176
DOI: 10.1103/PhysRevLett.77.5176
PACS: 13.25.Hw, 14.40.Nd

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