First observation of the decay B-c(+) -> J/psi K+

The decay B-c(+) -> J/psi K+ is observed for the first time using a data sample, corresponding to an integrated luminosity of 1.0 fb(-1), collected by the LHCb experiment in p p collisions at a centre-of-mass energy of 7 TeV. A yield of 46 +/- 12 events is reported, with a significance of 5.0 standard deviations. The ratio of the branching fraction of B-c(+) -> J/psi K+ to that of B-c(+) -> J/psi pi(+) is measured to be 0.069 +/- 0.019 +/- 0 : 005, where the first uncertainty is statistical and the second is systematic.


Published in:
Journal Of High Energy Physics, 9, 075
Year:
2013
Publisher:
New York, Springer Verlag
ISSN:
1029-8479
Keywords:
Laboratories:




 Record created 2013-12-09, last modified 2018-01-28


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