Are narrow unflavoured mesons a signature of new physics?

TL;DR

This paper presents new data on narrow low-mass unflavored mesons, revealing their potential connection to stable hadrons and suggesting they could indicate new physics beyond the Standard Model.

Contribution

It compiles and analyzes data on exotic mesonic structures, proposing a possible interpretation linked to new physics phenomena.

Findings

Identification of a mass sequence of exotic mesons

Significant coupling with stable hadrons like pions and nucleons

Reproduction of exotic baryon and dibaryon masses

Abstract

New data of narrow low mass unflavoured mesonic structures are presented. A table of these exotic masses is obtained adding previously published data. The mass sequence shows a significant coupling of some of these clusters with stable hadrons: pion, nucleon, and deuteron. Indeed this coupling allows to reproduce rather well the masses of exotic narrow baryons and dibaryons. A discussion is presented to suggest a possible interpretation of these exotic hadronic structures.