Decay widths of the excited $\hat{I}{\text{c◯}}_b$ baryons

Abstract

The LHCb Collaboration recently observed five narrow $\hat{I}{\text{c◯}}_c^0$ resonances, and measured their masses and widths through the decays $\hat{I}{\text{c◯}}_c^0\to \hat{I}{ž}_c^{+}{K}^{-}$. Motivated by this discovery, and also by the fact that the ground-state bottom baryon $\hat{I}{\text{c◯}}_b^{-}$ with spin-1/2 was already found experimentally, we perform theoretical investigation of the spin-1/2 and spin-3/2, $\hat{I}{\text{c◯}}_b$, baryons by calculating decay width of their first orbitally and radially excited states to $\hat{I}{ž}_b^0{K}^{-}$. 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.

17 Pages, 8 Figures and 1 Table