# Measurement of the ratio of branching fractions B(B+c→J/ψK+)/B(B+c→J/ψπ+)

Abstract : The ratio of branching fractions RK/π≡B(B+c→J/ψK+)/B(B+c→J/ψπ+) 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 3fb−1. It is found to be RK/π=0.079±0.007±0.003, 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.

http://hal.in2p3.fr/in2p3-01348885
Contributor : Claudine Bombar <>
Submitted on : Tuesday, July 26, 2016 - 9:57:13 AM
Last modification on : Monday, June 3, 2019 - 1:38:03 PM

### Citation

R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Measurement of the ratio of branching fractions B(B+c→J/ψK+)/B(B+c→J/ψπ+). Journal of High Energy Physics, Springer Verlag (Germany), 2016, 09, pp.153. ⟨10.1007/JHEP09(2016)153⟩. ⟨in2p3-01348885⟩

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