Measurement of b hadron fractions in 13 TeV pp collisions

Abstract

The production fractions of B¯ 0s and Λ0b hadrons, normalized to the sum of B− and B¯ 0 fractions, are measured in 13 TeV pp collisions using data collected by the LHCb experiment, corresponding to an integrated luminosity of 1.67 fb−1. These ratios, averaged over the b hadron transverse momenta from 4 to 25 GeV and pseudorapidity from 2 to 5, are 0.122 0.006 for B¯ 0s, and 0.259 0.018 for Λ0 b, where the uncertainties arise from both statistical and systematic sources. The Λ0b ratio depends strongly on transverse momentum, while the B¯ 0 s ratio shows a mild dependence. Neither ratio shows variations with pseudorapidity. The measurements are made using semileptonic decays to minimize theoretical uncertainties. In addition, the ratio of Dþ to D0 mesons produced in the sum of B¯ 0 and B− semileptonic decays is determined as 0.359+- 0.006+- 0.009, where the uncertainties are statistical and systematic