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.
Measurement of the mass difference and relative production rate of the Ωb- and Ξb- baryons
2023
Settore FIS/01 - Fisica Sperimentale
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
File in questo prodotto:
File Dimensione Formato  
PhysRevD.108.052008_reduced.pdf

accesso aperto

Tipologia: Published version
Licenza: Creative Commons
Dimensione 1.44 MB
Formato Adobe PDF
1.44 MB Adobe PDF

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/153983
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 4
  • ???jsp.display-item.citation.isi??? 4
  • OpenAlex 4
social impact