Measurement of the ratio of branching fractions and difference in $CP$ asymmetries of the decays $B^+\to J/ψπ^+$ and $B^+\to J/ψ K^+$статья
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Аннотация: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 3fb−1 at centre-of-mass energies of 7 and 8TeV. 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.