Measurement of B meson production fraction ratios in proton-proton collisions at $\sqrt{s}$ = 13 TeV using open-charm and charmonium decays

Abstract

Production fraction ratios of B${}^{+}$, B${}^0$, and B${}_{\mathrm{s}}^0$ mesons are measured in proton-proton collisions at $\sqrt{s}$ = 13 TeV using a special data set recorded in 2018 with high-rate triggers designed to collect an unbiased sample of $10^{10}$ b hadrons with the CMS experiment at the LHC. These data allow the study of the open-charm decays of B mesons (B${}_{(\mathrm{s})}$ $\to$ $\pi$D${}_{(\mathrm{s})}$) 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 ($p_{\mathrm{T}}$) and rapidity ($y$) are measured using the open-charm decays in the kinematic range of 8 $<$ $p_{\mathrm{T}}$ $<$ 60 GeV and $|y|$ $<$ 2.25. In addition, the same data set is used to measure the relative production fraction ratios with the charmonium decay channels (B${}_{(\mathrm{s})}$ $\to$ XJ/$\psi$ with X indicating a K${}^{+}$, K${}^{\ast }$(892)${}^0$, or $\varphi$(1020) meson) where the J/$\psi$ 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.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-21-007 (CMS Public Pages)

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