Precision measurement of the Bc+$$ {B}_c^{+} $$ meson mass

A precision measurement of the $$ {B}_c^{+} $$ meson mass is performed using proton- proton collision data collected with the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to a total integrated luminosity of 9.0 fb−1. The $$ {B}_c^{+} $$ mesons are reconstructed via the decays $$ {B}_c^{+} $$ → J/ψπ+, $$ {B}_c^{+} $$ → J/ψπ+π−π+, $$ {B}_c^{+}\to J/\psi p\overline{p}{\pi}^{+} $$ , $$ {B}_c^{+}\to J/\psi {D}_s^{+} $$ , $$ {B}_c^{+} $$ → J/ψ D0K+ and $$ {B}_c^{+}\to {B}_s^0{\pi}^{+} $$ . Combining the results of the individual decay channels, the $$ {B}_c^{+} $$ mass is measured to be 6274.47 ± 0.27 (stat) ± 0.17 (syst) MeV/c2. This is the most precise measurement of the $$ {B}_c^{+} $$ mass to date. The difference between the $$ {B}_c^{+} $$ and $$ {B}_s^0 $$ meson masses is measured to be 907.75 ± 0.37 (stat) ± 0.27 (syst) MeV/c.