Is pentaquark doublet a hadronic molecule?

TL;DR

The paper explores whether the observed pentaquark doublet could be a hadronic molecule or a more elementary colored state, suggesting a new perspective on pentaquark structure.

Contribution

It proposes that the doublet structure may originate from colored baryon and meson constituents, offering a novel interpretation of pentaquark nature.

Findings

Degeneracy could arise from colored constituents.

Pentaquark might be an elementary colored state.

Implication of new non-Abelian chemistry.

Abstract

A recently announced discovery by LHCb of a doublet of overlapping pentaquark resonances poses a question of what can be the origin of this doublet structure. We attract attention to the fact that such degeneracy could naturally arise if constituent "baryon" and "meson" were in the colored rather than colorless states. This is an appealing possibility, also because in such a case the pentaquark state would be no less "elementary" than the other hadrons, and would provide a chance for essentially new non-Abelian chemistry.