Observation of excited ${\Omega }_c^0$ baryons in ${\Omega }_b^{-}\to {\Xi }_c^{+}{K}^{-}{\pi }^{-}$ decays

Abstract

The first observation of the ${\Omega }_b^{-}\to {\Xi }_c^{+}{K}^{-}{\pi }^{-}$ decay is reported using $pp$ collision data at centre-of-mass energies of 7, 8 and 13\,$\mathrm{TeV}$ collected by the LHCb experiment, corresponding to an integrated luminosity of 9\,${\mathrm{fb}}^{-1}$. Four excited ${\Omega }_c^0$ baryons are observed in the ${\Xi }_c^{+}{K}^{-}$ mass projection of the ${\Omega }_b^{-}\to {\Xi }_c^{+}{K}^{-}{\pi }^{-}$ decays with the significance of each exceeding five standard deviations. They coincide with the states previously observed in prompt \proton\proton 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 ${\Omega }_b^{-}\to {\Xi }_c^{+}{K}^{-}{\pi }^{-}$ is measured relative to the ${\Omega }_b^{-}\to {\Omega }_c^0{\pi }^{-}$ decay mode and a precise measurement of the ${\Omega }_b^{-}$ mass of \mbox{$6044.3\pm 1.2\pm 1.1_{-0.22}^{+0.19}\mathrm{MeV}$} is obtained.

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-012.html (LHCb public pages)

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