Observation of Cabibbo-Suppressed Two-Body Hadronic Decays and Precision Mass Measurement of the Ωc0 Baryon

• The first observation of the singly Cabibbo-suppressed Ωc0 → Ω-K+ and Ωc0 → 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 beB(Ωc0 → Ω-K+) / B(Ωc0 → Ω-π+) = [6.08 ± ‚0.51 (stat) ± ‚0.40 (syst)]ƒ%, B(Ωc0 → Ξ-π+) / B(Ωc0 → Ω-π+) = [15.81 ± ‚0.87(stat) ± 0.44(syst) ± ‚0.16(ext)ƒ%.In addition, using the Ωc0 → Ω-π+ decay channel, the Ωc0 baryon mass is measured to be M(Ωc0) = 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.

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NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

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