Measurement of B meson production fraction ratios in proton-proton collisions at sqrt(s) = 13 TeV using open-charm and charmonium decays

Production fraction ratios of Bþ, B0, and B0s mesons are measured in proton-proton collisions at ffiffis p ¼ 13 TeV using a special dataset recorded in 2018 with high-rate triggers designed to collect an unbiased sample of 1010 b hadrons with the CMS experiment at the LHC. These data allow the study of the opencharm decays of B mesons (BðsÞ → πDðsÞ) where the D meson decays into fully hadronic final states. By utilizing known branching fractions and precise theoretical calculations, production fraction ratios as functions of B meson transverse momentum ðpTÞ and rapidity (y) are measured using open-charm decays in the kinematic range of 8 < 60 GeV and jyj < 2.25. In addition, the same dataset is used to measure the relative production fraction ratios with the charmonium decay channels [BðsÞ → XJ=ψ with X indicating a Kþ, Kð892Þ0, or ϕð1020Þ meson] where the J=ψ meson decays into a pair of muons. The open-charm results are used to normalize the relative production fraction ratios obtained from the charmonium samples. Measurements of the ratios of branching fractions of B meson decays to charmonium and open-charm final states are also reported, which will improve the world-average values of these ratios. Finally, we test isospin invariance in B meson production in proton-proton collisions and observe that it holds within the experimental precision