Measurement of the ratio of branching fractions and difference in CP asymmetries of the decays B+→J/ψπ+ and B+→J/ψK+

Abstract : The ratio of branching fractions and the difference in CP asymmetries of the decays B+→J/ψπ+ and B+→J/ψK+ are measured using a data sample of pp collisions collected by the LHCb experiment, corresponding to an integrated luminosity of 3 fb−1 at centre-of-mass energies of 7 and 8 TeV. The results are B(B+→J/ψπ+)B(B+→J/ψK+)=(3.83±0.03±0.03)×10−2, ACP(B+→J/ψπ+)−ACP(B+→J/ψK+)=(1.82±0.86±0.14)×10−2, where the first uncertainties are statistical and the second are systematic. Combining this result with a recent LHCb measurement of ACP(B+→J/ψK+) provides the most precise estimate to date of CP violation in the decay B+→J/ψπ+, ACP(B+→J/ψπ+)=(1.91±0.89±0.16)×10−2.
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Submitted on : Tuesday, December 20, 2016 - 9:19:23 AM
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R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Measurement of the ratio of branching fractions and difference in CP asymmetries of the decays B+→J/ψπ+ and B+→J/ψK+. Journal of High Energy Physics, Springer Verlag (Germany), 2017, 03, pp.036. ⟨10.1007/JHEP03(2017)036⟩. ⟨in2p3-01419875⟩

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