Measurement of the mass difference and relative production rate of the Ω−b and Ξ−b baryons

The mass difference between the Ω−b and Ξ−b baryons is measured using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9  fb−1, and is found to be m(Ω−b)−m(Ξ−b)=248.54±0.51(stat)±0.38(syst)  MeV/c2. The mass of the Ω−b baryon is measured to be m(Ω−b)=6045.9±0.5(stat)±0.6(syst)  MeV/c2. This is the most precise determination of the Ω−b mass to date. In addition, the production rate of Ω−b baryons relative to that of Ξ−b baryons is measured for the first time in pp collisions, using an LHCb dataset collected at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 6  fb−1. Reconstructing beauty baryons in the kinematic region 2