Exotic low mass narrow baryons extracted from charge exchange reactions

TL;DR

This paper reanalyzes data from charge exchange reactions to provide additional evidence for the existence of narrow, low-mass exotic baryons that cannot be explained by traditional three-quark models.

Contribution

It presents new analysis of existing data to support the existence of narrow exotic baryons with masses below the pion threshold, challenging conventional baryon models.

Findings

Identification of narrow baryonic structures in multiple datasets

Evidence of masses below the pion threshold

Confirmation of exotic nature of these baryons

Abstract

This paper aims to give further evidence for the existence of low mass exotic baryons. Narrow structures in baryonic missing mass or baryonic invariant mass were observed during the last twelve years. Since their evidence is still under debate, various data, measured with incident hadrons, by different collaborations, are reanalyzed to bring evidence on these narrow exotic baryonic resonances excited in charge-exchange reactions. These structures are clearly exotic as there is no room for them in the $qqq$ configurations: their width is smaller than the widths of "classical" baryonic resonances, moreover some of the masses lie below the pion threshold mass.