The ${\Omega }_c$-puzzle solved by means of spectrum and strong decay amplitude predictions

Abstract

The observation of new ${\Omega }_c=ssc$ states by LHCb \cite{Aaij:2017nav} and the confirmation of four of them by Belle \cite{Yelton:2017qxg} may represent an important milestone in our understanding of the quark organization inside hadrons. By providing results for the spectrum of ${\Omega }_{c(b)}$ baryons and predictions for their ${\Xi }_{c(b)}^{+}{K}^{-}$ decay channels, we suggest a possible solution to the ${\Omega }_c$ quantum number puzzle. We also discuss why the set of ${\Omega }_{c(b)}$ baryons are the most suitable environment to test the validity of three-quark and quark-diquark effective degrees of freedom. Finally, we calculate the masses and the partial decay widths of the ${\Xi }_b(6227)$ and ${\Sigma }_b(6097)$ states, just observed by LHCb \cite{Aaij:2018yqz,Aaij:2018tnn}. Our results are in good agreement with LHCb experimental data.

Comments: 7 pages,6 figures