The first observation of the Ωb− → Ξc+ K− π− decay is reported using pp collision data at center of mass energies of 7, 8, and 13 TeV collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb^−1. Four excited Ωc0 baryons are observed in the Ξc+ K− mass projection of the Ωb− → Ξc+ K− π− decays with the significance of each exceeding five standard deviations. They coincide with the states previously observed in prompt pp and e+ e− production. Relative production rates, masses, and natural widths of the states are measured, and a test of spin hypotheses is performed. Moreover, the branching ratio of Ωb− → Ξc+ K− π− is measured relative to the Ωb− → Ωc0 π− decay mode and a precise measurement of the Ωb− mass of 6044.3 ± 1.2 ± 1.1{−0.22}{+0.19} MeV is obtained.
Observation of Excited Ωc0 Baryons in Ωb− → Ξc+ K− π− Decays
Capriotti, L.;
2021
Abstract
The first observation of the Ωb− → Ξc+ K− π− decay is reported using pp collision data at center of mass energies of 7, 8, and 13 TeV collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb^−1. Four excited Ωc0 baryons are observed in the Ξc+ K− mass projection of the Ωb− → Ξc+ K− π− decays with the significance of each exceeding five standard deviations. They coincide with the states previously observed in prompt pp and e+ e− production. Relative production rates, masses, and natural widths of the states are measured, and a test of spin hypotheses is performed. Moreover, the branching ratio of Ωb− → Ξc+ K− π− is measured relative to the Ωb− → Ωc0 π− decay mode and a precise measurement of the Ωb− mass of 6044.3 ± 1.2 ± 1.1{−0.22}{+0.19} MeV is obtained.| File | Dimensione | Formato | |
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2021-AR-39-Obs_of_Exc_Omegac0_Baryons_in_Omegabm_to_Xicp_Km_pim-PRD.pdf
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