Charmonium tetraquarks and pentaquarks or an additional quark?

TL;DR

This paper proposes that many exotic hadrons can be explained by introducing a seventh quark flavor with specific properties, successfully matching observed data and predicting new hadrons and decay modes.

Contribution

It introduces a hypothesis that a seventh quark flavor accounts for exotic hadrons, providing a unified explanation and making new predictions.

Findings

Reproduces mass, spin, parity, production, and decay modes of observed exotic hadrons.

Predicts additional hadrons and new decay modes.

Supports the existence of a seventh quark flavor with specific properties.

Abstract

Most of the exotic hadrons discovered over the last 20 years fit into the quark model as normal mesons and baryons if the existence of a seventh flavor of quark is hypothesized. If the quark has a mass of $\sim$2.9 GeV, a charge of $-\tfrac{1}{3}$, and light-scalar-mediated decays to other quarks and $c\bar{c}$, then it is able to reproduce the mass, spin, parity, production and decay modes of most observed exotic hadrons. Predictions are made for additional hadrons as well as new production and decay modes for observed exotic hadrons.