Measurement of the dependence of the hadron production fraction ratio $f_{\mathrm{s}}/f_{\mathrm{u}}$ and $f_{\mathrm{d}}/f_{\mathrm{u}}$ on B meson kinematic variables in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Abstract

The dependence of the ratio between the B${}_{\mathrm{s}}^0$ and B${}^{+}$ hadron production fractions, $f_{\mathrm{s}}/f_{\mathrm{u}}$, on the transverse momentum ($p_{\mathrm{T}}$) and rapidity of the B mesons is studied using the decay channels B${}_{\mathrm{s}}^0$ $\to$ J$/\psi \varphi$ and B${}^{+}$ $\to$ J$/\psi$ K${}^{+}$. The analysis uses a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the CMS experiment in 2018 and corresponding to an integrated luminosity of 61.6 fb${}^{-1}$. The $f_{\mathrm{s}}/f_{\mathrm{u}}$ ratio is observed to depend on the B $p_{\mathrm{T}}$ and to be consistent with becoming asymptotically constant at large $p_{\mathrm{T}}$. No rapidity dependence is observed. The ratio of the B${}^0$ to B${}^{+}$ hadron production fractions, $f_{\mathrm{d}}/f_{\mathrm{u}}$, measured using the B${}^0$ $\to$ J$/\psi$ K${}^{\ast 0}$ decay channel, is found to be consistent with unity and independent of $p_{\mathrm{T}}$ and rapidity, as expected from isospin invariance.

Replaced with the published version. Added the journal reference and DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-21-001 (CMS Public Pages)

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• Towards the understanding of heavy quarks hadronization: from leptonic to heavy-ion collisions
• Measurement of B meson production fraction ratios in proton-proton collisions at $\sqrt{s}$ = 13 TeV using open-charm and charmonium decays