# 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.
Type de document :
Article dans une revue
Journal of High Energy Physics, Springer Verlag (Germany), 2017, 03, pp.036. 〈10.1007/JHEP03(2017)036〉

http://hal.in2p3.fr/in2p3-01419875
Contributeur : Claudine Bombar <>
Soumis le : mardi 20 décembre 2016 - 09:19:23
Dernière modification le : jeudi 18 janvier 2018 - 01:38:24

### Citation

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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