Invisible Charm Exotica

TL;DR

This paper explores the interpretation of certain LHCb-observed $ ext{Omega}_c^0$ states as exotic pentaquarks within the Chiral Quark--Soliton Model, predicting additional states with varying widths and stability properties.

Contribution

It predicts the existence of multiple exotic heavy baryon multiplets and explains their potential narrow or broad widths and stability, providing a theoretical framework for future experimental searches.

Findings

Certain $ ext{Omega}_c^0$ states may be exotic pentaquarks.

Predicted multiplets include states with different widths.

Lightest states are stable against two-body strong decays.

Abstract

One possible interpretation of two narrow $\Omega^0_c$ states reported by the LHCb Collaboration at CERN in 2017 is that they are pentaquarks belonging to a $\overline{\boldsymbol{15}}$ exotic SU(3) representation, as predicted by the Chiral Quark--Soliton Model. If so, there must exist a number of other exotic states since the model predicts three different $\overline{\boldsymbol{15}}$ multiplets of heavy baryons. We show, that depending on the soliton spin $J$, these states are either very narrow or very broad. This explains why they might have escaped experimental observation. Furthermore, we show that the lightest members of these multiplets are stable against two body strong decays.