arxiv: 1607.06823 · v5 · submitted 2016-07-22 · ✦ hep-ex
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Measurement of the ratio of branching fractions mathcal{B}(B_{c}⁺ to J/psi K⁺)/mathcal{B}(B_{c}⁺ to J/psiπ⁺)
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The ratio of branching fractions $R_{K/\pi} \equiv \mathcal{B}(B_{c}^{+} \to J/\psi K^{+})/\mathcal{B}(B_{c}^{+} \to J/\psi\pi^{+})$ is measured with $pp$ collision data collected by the LHCb experiment at centre-of-mass energies of 7 TeV and 8 TeV, corresponding to an integrated luminosity of 3${\mbox{fb}^{-1}}$. It is found to be $ R_{K/\pi} = 0.079\pm0.007\pm0.003$, where the first uncertainty is statistical and the second is systematic. This measurement is consistent with the previous LHCb result, while the uncertainties are significantly reduced.
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