The first observation of the singly Cabibbo-suppressed Ω⁰c → Ω⁻ K⁺ and Ω⁰c → Ξ⁻ π⁺ 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 ℬ(Ω⁰c → Ω⁻ K⁺) / ℬ(Ω⁰c → Ω⁻ π⁺) = (6.08 ± 0.51 (stat) ± 0.40 (syst))%, ℬ(Ω⁰c → Ξ⁻ π⁺) / ℬ(Ω⁰c → Ω⁻ π⁺) = (15.81 ± 0.87 (stat) ± 0.44 (syst) ± 0.16 (ext))%. In addition, using the Ω⁰c → Ω⁻ π⁺ decay channel, the Ω⁰c baryon mass is measured to be M(Ω⁰c) = 2695.28 ± 0.07 (stat) ± 0.27 (syst) ± 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 Ωc0 Baryon
Veltri, M.;
2024
Abstract
The first observation of the singly Cabibbo-suppressed Ω⁰c → Ω⁻ K⁺ and Ω⁰c → Ξ⁻ π⁺ 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 ℬ(Ω⁰c → Ω⁻ K⁺) / ℬ(Ω⁰c → Ω⁻ π⁺) = (6.08 ± 0.51 (stat) ± 0.40 (syst))%, ℬ(Ω⁰c → Ξ⁻ π⁺) / ℬ(Ω⁰c → Ω⁻ π⁺) = (15.81 ± 0.87 (stat) ± 0.44 (syst) ± 0.16 (ext))%. In addition, using the Ω⁰c → Ω⁻ π⁺ decay channel, the Ω⁰c baryon mass is measured to be M(Ω⁰c) = 2695.28 ± 0.07 (stat) ± 0.27 (syst) ± 0.30 (ext) MeV, improving the precision of the previous world average by a factor of 4.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
