First observation of the decay B_c^+→J / ψK^+.
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Journal of High Energy Physics（2013）
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摘要
The decay B_c^+→J / ψK^+. 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 pp 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 / ψK^+. to that of B_c^+→J / ψπ^+. is measured to be 0.069 ± 0.019 ± 0.005, where the first uncertainty is statistical and the second is systematic.
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关键词
Hadron-Hadron Scattering, Branching fraction, B physics
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