Measurement of the Bc− meson production fraction and asymmetry in 7 and 13 TeV pp collisions

The production fraction of the $B_c^{-}$ meson with respect to the sum of $B^{-}$ and ${\overline{B}}^0$ mesons is measured in both 7 and 13 TeV center-of-mass (c.m.) energy $pp$ collisions produced by the Large Hadron Collider (LHC), using the LHCb detector. The rate, approximately 3.7 per mille, does not change with energy, but shows a transverse momentum dependence. The $B_c^{-}-B_c^{+}$ production asymmetry is also measured and is consistent with zero within the determined statistical and systematic uncertainties of a few percent.