Precision measurement of the $B_c^{+}$ meson mass

Abstract

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 $9.0{\mathrm{fb}}^{-1}$. The $B_c^{+}$ mesons are reconstructed via the decays $B_c^{+}\to J/\psi {\pi }^{+}$, $B_c^{+}\to J/\psi {\pi }^{+}{\pi }^{-}{\pi }^{+}$, $B_c^{+}\to J/\psi p\bar{p}{\pi }^{+}$, $B_c^{+}\to J/\psi D_s^{+}$, $B_c^{+}\to J/\psi D^0{K}^{+}$ and $B_c^{+}\to B_s^0{\pi }^{+}$. Combining the results of the individual decay channels, the $B_c^{+}$ mass is measured to be $6274.47\pm 0.27(\mathrm{stat})\pm 0.17(\mathrm{syst})\mathrm{Me}\mathrm{V}/c^2$. 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 $907.75\pm 0.37(\mathrm{stat})\pm 0.27(\mathrm{syst})\mathrm{Me}\mathrm{V}/c^2$.

arXiv commentAll figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-003.html

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• Performance of the LHCb RICH detectors during LHC Run 2
• Purely leptonic decays of the ground charged vector mesons
• Search for the doubly heavy baryon ${\Xi }_{bc}^{+}$ decaying to $J/\psi {\Xi }_c^{+}$
• The role of multi-parton interactions in doubly-heavy hadron production
• Searching $B_c^{\ast }$ via conservation laws
• Spectroscopy of heavy-heavy flavour mesons and annihilation widths of quarkonia
• Observation of orbitally excited $B_c^{+}$ states
• $B_c$ to $A$ Transition Form Factors and Semileptonic Decays in Self-consistent Covariant Light-front Approach
• $B_c$ meson exclusive decays to a $P$-wave charmonium and a pion at NLO accuracy
• Possibility of experimental study on nonleptonic $B_c^{\ast }$ weak decays
• Study of $B_c(1P{)}^{+}$ states in the $B_c^{+}\gamma$ mass spectrum
• Improving systematic uncertainties on precision two-body mass measurements