Decay widths of the excited ${\Omega }_b$ baryons

Abstract

The LHCb Collaboration recently observed five narrow ${\Omega }_c^0$ resonances, and measured their masses and widths through the decays ${\Omega }_c^0\to {\Xi }_c^{+}{K}^{-}$. Motivated by this discovery, and also by the fact that the ground-state bottom baryon ${\Omega }_b^{-}$ with spin-1/2 was already found experimentally, we perform theoretical investigation of the spin-1/2 and spin-3/2, ${\Omega }_b$, baryons by calculating decay width of their first orbitally and radially excited states to ${\Xi }_b^0{K}^{-}$. For this purpose, we employ QCD sum rule method on the light-cone by including into analysis the $K$ meson distribution amplitudes up to twist-4. Obtained analytical expressions are utilized to extract parameters of these decay processes which may be useful for forthcoming experimental studies of bottom baryons.

Comments: 17 Pages, 8 Figures and 1 Table