First observation of the decay $B_c^{+}\to J/\psi K^{+}$

Abstract

The decay $B_c^{+}\to J/\psi K^{+}$ 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 $pp$ collisions at a centre-of-mass energy of $7\mathrm{Te}\mathrm{V}$. A yield of $46\pm 12$ events is reported, with a significance of 5.0 standard deviations. The ratio of the branching fraction of $B_c^{+}\to J/\psi K^{+}$ to that of $B_c^{+}\to J/\psi {\pi }^{+}$ is measured to be $0.069\pm 0.019\pm 0.005$, where the first uncertainty is statistical and the second is systematic.

16 pages including author list, 2 figures

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• Exclusive semileptonic and nonleptonic decays of the Bc meson
• Measurement of the Bc meson mass in the exclusive decay Bc --> Jpsi Pi
• Measurements of the branching fractions and CP asymmetries of B+ to J/psi pi+ and B+ to psi(2S) pi+ decays
• Measurements of the branching fractions of the decays $B_s^0\to D_s^{\mp }{K}^{\pm }$ and $B_s^0\to D_s^{-}{\pi }^{+}$

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