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Free keywords:
Particle decays, Mass, Baryons, Charm quark, Electroweak interaction
MPINP:
LHCb - Abteilung Hinton
Abstract:
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 be (B(Ωc0→Ω−K+)) / (B(Ωc0→Ω−π+)) = [6.08±0.51(stat)±0.40(syst)]%,(B(Ωc0→Ξ−π+)) / (B(Ωc0→Ω−π+)) = [15.81±0.87(stat)±0.44(syst)±0.16(ext)]%. 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.