Measurement of the branching fraction of the B0→D+sπ− decay
A branching fraction measurement of the 𝐵0→𝐷+𝑠𝜋−B0→Ds+π− decay is presented using proton–proton collision data collected with the LHCb experiment, corresponding to an integrated luminosity of 5.0fb−15.0fb−1. The branching fraction is found to be (𝐵0→𝐷+𝑠𝜋−)=(19.4±B(B0→Ds+π−)=(19.4± 1.8±1.3±1.2)×10−61.8±1.3±1.2)×10−6, where the first uncertainty is statistical, the second systematic and the third is due to the uncertainty on the 𝐵0→𝐷−𝜋+B0→D−π+, 𝐷+𝑠→𝐾+𝐾−𝜋+Ds+→K+K−π+ and 𝐷−→𝐾+𝜋−𝜋−D−→K+π−π−branching fractions. This is the most precise single measurement of this quantity to date. As this decay proceeds through a single amplitude involving a 𝑏→𝑢b→u charged-current transition, the result provides information on non-factorisable strong interaction effects and the magnitude of the Cabibbo–Kobayashi–Maskawa matrix element 𝑉𝑢𝑏Vub. Additionally, the collision energy dependence of the hadronisation-fraction ratio 𝑓𝑠/𝑓𝑑fs/fd is measured through 𝐵⎯⎯⎯⎯0𝑠→𝐷+𝑠𝜋−B¯s0→Ds+π− and 𝐵0→𝐷−𝜋+B0→D−π+ decays.