Measurement of the branching fraction B(B+u??J/?r?k+) and Search for B+c??J/?r?k+
Journal
Physical Review Letters
Journal Volume
77
Journal Issue
26
Pages
5176-5181
Date Issued
1996
Author(s)
Abe, F. et al. (CDF Collaboration)
Abstract
We report on a measurement of the branching fraction of the Cabibbo-suppressed decay B+u→J/ψπ+, where J/ψJ/ψμ+μ-. The data were collected by the Collider Detector at Fermilab during 1992–1995 and correspond to an integrated luminosity of 110pb-1 in pp collisions at √s=1.8TeV. A signal of 28+10-9 events is observed and we determine the ratio of branching fractions B(B+u→J/ψπ+)/B(B+u→J/ψK+) to be [5.0+1.9-1.7(stat)±0.1(syst)]%. Using the world average value for B(B+u→J/ψπ+), we calculate the branching fraction B(B+u→J/ψπ+) to be (5.0+2.1-1.9)×10-5. We also search for the decay B+c→J/ψπ+ and report a 95% confidence level limit on σ(B+c)B+c→J/ψπ+/σ(B+u)B(B+u→J/ψK+) as a function of the B+c lifetime. © 1996 The American Physical Society.
Type
journal article