Study of $$ {\mathrm{B}}_{\mathrm{c}}^{+}\to \mathrm{J}/\psi {\mathrm{D}}_{\mathrm{s}}^{+} $$ and $$ {\mathrm{B}}_{\mathrm{c}}^{+}\to \mathrm{J}/\psi {\mathrm{D}}_{\mathrm{s}}^{\ast +} $$ decays in pp collisions at $$ \sqrt{\mathrm{s}} $$ = 13 TeV with the ATLAS detector

A bstract study of $$ {B}_c^{+}\to J/\psi {D}_s^{+} B c + → J / ψ D s and {D}_s^{\ast +} ∗ decays using 139 fb − 1 integrated luminosity collected with the ATLAS detector from \sqrt{s} = 13 TeV pp collisions at LHC is presented. The ratios branching fractions two to fraction {B}_c^{+} → J/ψπ + decay are measured: \mathcal{B}\left({B}_c^{+}\to {D}_s^{+}\right)/\mathcal{B}\left({B}_c^{+}\to J/{\psi \pi}^{+}\right) ψπ 2 . 76 ± 0 47 +}\right)/\mathcal{B}\left({B}_c^{+}\to 5 33 96. ratio found be +}\right) 93 26. For decay, transverse polarization fraction, Γ ±± / Γ, measured 70 11. reported uncertainties include both statistical systematic components added in quadrature. precision measurements exceeds that all previous studies these decays. These results supersede those obtained earlier same 7 8 collision data. comparison available theoretical predictions for quantities