Precise measurement of the f(s)/f(d) ratio of fragmentation fractions and of B-s(0) decay branching fractions

The ratio of the B s 0 and B 0 fragmentation fractions, f s / f d , in proton-proton collisions at the LHC, is obtained as a function of B -meson transverse momentum and collision center-of-mass energy from the combined analysis of different B -decay channels measured by the LHCb experiment. The results are described by a linear function of the meson transverse momentum or with a function inspired by Tsallis statistics. Precise measurements of the branching fractions of the B s 0 → J / ψ ϕ and B s 0 → D s - π + decays are performed, reducing their uncertainty by about a factor of 2 with respect to previous world averages. Numerous B s 0 decay branching fractions, measured at the LHCb experiment, are also updated using the new values of f s / f d and branching fractions of normalization channels. These results reduce a major source of systematic uncertainty in several searches for new physics performed through measurements of B s 0 branching fractions.