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The dependence of the ratio between the B$_\mathrm{s}^0$ and B$^+$ hadronproduction fractions, $f_\mathrm{s} / f_\mathrm{u}$, on the transverse momentum($p_\mathrm{T}$) and rapidity of the B mesons is studied using the decaychannels B$_\mathrm{s}^0$ $\to$ J$/\psi\,\phi$ and B$^+$ $\to$ J$/\psi$ K$^+$.The analysis uses a data sample of proton-proton collisions at a center-of-massenergy of 13 TeV, collected by the CMS experiment in 2018 and corresponding toan 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 withbecoming asymptotically constant at large $p_\mathrm{T}$. No rapiditydependence is observed. The ratio of the B$^0$ to B$^+$ hadron productionfractions, $f_\mathrm{d} / f_\mathrm{u}$, measured using the B$^0$ $\to$J$/\psi$ K$^{*0}$ decay channel, is found to be consistent with unity andindependent of $p_\mathrm{T}$ and rapidity, as expected from isospininvariance.

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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