Precision measurement of the B+c meson mass

LHCb collaboration

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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/psi pi(+), B-c(+)-> J/psi pi(+)pi(-)pi(+), B-c(+)-> J/psi pp<overbar>pi(+), B-c(+)-> J/psi D-s(+), B-c(+)-> J/psi (DK+)-K-0 and B-c(+)-> 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/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 +/- 0.37 (stat) +/- 0.27 (syst) MeV/c(2).
Original languageEnglish
Article number123
Number of pages21
JournalJournal of High Energy Physics
Issue number7
Publication statusPublished - 20 Jul 2020


  • b physics
  • b-c spectroscopy
  • charm
  • decays
  • hadron-hadron scattering (experiments)
  • qcd
  • search
  • spectroscopy
  • Spectroscopy
  • Hadron-Hadron scattering (experiments)
  • B physics
  • QCD

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