Open- and hidden-charm tetra-quark scalar mesons

TL;DR

This paper presents a new approach to estimate the masses of open- and hidden-charm tetra-quark scalar mesons, revealing significantly lower masses in the hidden-charm sector and providing insights consistent with recent experimental observations.

Contribution

The study introduces a novel method for calculating tetra-quark meson masses, improving accuracy over previous naive quark counting approaches.

Findings

Hidden-charm scalar meson masses are significantly lower than earlier estimates.

The non-strange iso-triplet scalar meson mass aligns with the observed eta pi peak around 3.2 GeV.

No signal observed in the eta_c pi channel.

Abstract

Masses of open- and hidden-charm tetra-quark scalar mesons are studied in a new approach. As the result, newly estimated masses of hidden-charm sector are significantly lower than our earier ones by a naive quark counting. In particular, our new result on the non-strange iso-triplet scalar mesons should be compared with the experiment that an indication of tiny eta pi peak around 3.2 GeV has been observed, while no signal in the eta_c pi channel.