The first observation of the singly Cabibbo-suppressed Omegac0->omega-K+ and Omegac0->Xi-pi+ decays is reported, using proton-proton collision data at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb-1, collected with the LHCb detector between 2016 and 2018. The branching fraction ratios are measured to be BR(Omegac0->Omega-K+)B(Omegac0->Omega-pi+)=[6.08 \pm 0.51(stat)\pm 0.40(syst)]%,BR(Omegac0->Xi-pi+)BR(Omegac0->Omega-pi+)=[15.81 \pm 0.87(stat)\pm 0.44(syst)\pm 0.16(ext)]%. In addition, using the Omegac0\to Omega-pi+ decay channel, the Omegac0 baryon mass is measured to be M(Omegac0)=2695.28 \pm 0.07(stat) \pm 0.27(syst) \pm 0.30(ext) MeV, improving the precision of the previous world average by a factor of 4.
Observation of Cabibbo-Suppressed Two-Body Hadronic Decays and Precision Mass Measurement of the omegac0 Baryon
Bassi G.Membro del Collaboration Group
;Kleijne N.Membro del Collaboration Group
;Morello M. J.Membro del Collaboration Group
;Pica L.Membro del Collaboration Group
;Ribatti R.Membro del Collaboration Group
;
2024
Abstract
The first observation of the singly Cabibbo-suppressed Omegac0->omega-K+ and Omegac0->Xi-pi+ decays is reported, using proton-proton collision data at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb-1, collected with the LHCb detector between 2016 and 2018. The branching fraction ratios are measured to be BR(Omegac0->Omega-K+)B(Omegac0->Omega-pi+)=[6.08 \pm 0.51(stat)\pm 0.40(syst)]%,BR(Omegac0->Xi-pi+)BR(Omegac0->Omega-pi+)=[15.81 \pm 0.87(stat)\pm 0.44(syst)\pm 0.16(ext)]%. In addition, using the Omegac0\to Omega-pi+ decay channel, the Omegac0 baryon mass is measured to be M(Omegac0)=2695.28 \pm 0.07(stat) \pm 0.27(syst) \pm 0.30(ext) MeV, improving the precision of the previous world average by a factor of 4.| File | Dimensione | Formato | |
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PhysRevLett.132.081802.pdf
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