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.

Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adeva, B., et al. (2024). Observation of Cabibbo-Suppressed Two-Body Hadronic Decays and Precision Mass Measurement of the ωc0 Baryon. PHYSICAL REVIEW LETTERS, 132(8) [10.1103/PhysRevLett.132.081802].

Observation of Cabibbo-Suppressed Two-Body Hadronic Decays and Precision Mass Measurement of the ωc0 Baryon

Borsato M.;Calvi M.;Capelli S.;Carniti P.;Fazzini D.;Garcia Pardinas J.;Gotti C.;Kirsebom V. S.;Martinazzoli L.;Martinelli M.;Minotti A.;Pizzichemi M.;Salomoni M.;Shields E. B.;
2024

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.
Articolo in rivista - Articolo scientifico
Hadron Spectroscopy; Cabibbo-Suppressed Decays
English
2024
132
8
081802
open
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adeva, B., et al. (2024). Observation of Cabibbo-Suppressed Two-Body Hadronic Decays and Precision Mass Measurement of the ωc0 Baryon. PHYSICAL REVIEW LETTERS, 132(8) [10.1103/PhysRevLett.132.081802].
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