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

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Schmelling,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Zavertyaev,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Citation

LHCb Collaboration, Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., et al. (2024). Observation of Cabibbo-Suppressed Two-Body Hadronic Decays and Precision Mass Measurement of the Ωc0 Baryon. Physical Review Letters, 132(8): 081802. doi:10.1103/PhysRevLett.132.081802.


Cite as: https://hdl.handle.net/21.11116/0000-000E-78B1-3
Abstract
The first observation of the singly Cabibbo-suppressed Ωc0→ΩK+ and Ωc0→Ξπ+ 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→ΩK+)) / (B(Ωc0→Ωπ+)) = [6.08±0.51(stat)±0.40(syst)]%,(B(Ωc0→Ξπ+)) / (B(Ωc0→Ωπ+)) = [15.81±0.87(stat)±0.44(syst)±0.16(ext)]%. In addition, using the Ωc0→Ωπ+ 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.