The mass difference between the Omegab- and Xib- 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(Omegab-)-m(Xib-)=248.54 \pm 0.51(stat) \pm 0.38(syst) MeV/c2. The mass of the Omegab- baryon is measured to be m(Omegab-)=6045.9 \pm 0.5(stat)\pm 0.6(syst) MeV/c2. This is the most precise determination of the Omegab- mass to date. In addition, the production rate of Omegab- baryons relative to that of Xib- 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<6 and pT<20 GeV/c with their decays to a J/Psi meson and a hyperon, the ratio F_Omegab- f_Xib- x B(Omegab-->J/PsiOmega-)B(Xib-->J/ψXi-)=0.120 \pm 0.008(stat) \pm 0.008(syst), is obtained, where f_Omegab- and f_Xib- are the fragmentation fractions of b quarks into Omegab- and Xib- baryons, respectively, and B represents the branching fractions of their respective decays.
Measurement of the mass difference and relative production rate of the Omegab- and Xib- baryons
Bassi G.Membro del Collaboration Group
;Kleijne N.Membro del Collaboration Group
;Lusiani A.Membro del Collaboration Group
;Morello M. J.Membro del Collaboration Group
;Pica L.Membro del Collaboration Group
;Ribatti R.Membro del Collaboration Group
;
2023
Abstract
The mass difference between the Omegab- and Xib- 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(Omegab-)-m(Xib-)=248.54 \pm 0.51(stat) \pm 0.38(syst) MeV/c2. The mass of the Omegab- baryon is measured to be m(Omegab-)=6045.9 \pm 0.5(stat)\pm 0.6(syst) MeV/c2. This is the most precise determination of the Omegab- mass to date. In addition, the production rate of Omegab- baryons relative to that of Xib- 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<6 and pT<20 GeV/c with their decays to a J/Psi meson and a hyperon, the ratio F_Omegab- f_Xib- x B(Omegab-->J/PsiOmega-)B(Xib-->J/ψXi-)=0.120 \pm 0.008(stat) \pm 0.008(syst), is obtained, where f_Omegab- and f_Xib- are the fragmentation fractions of b quarks into Omegab- and Xib- baryons, respectively, and B represents the branching fractions of their respective decays.| File | Dimensione | Formato | |
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PhysRevD.108.052008_reduced.pdf
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