The opportunity to find $\bar{d}^\ast(2380)$ in the $\Upsilon(nS)$ decay

TL;DR

This paper explores the potential to detect the exotic $\bar{d}^*(2380)$ particle in $\Upsilon(nS)$ decays using a phenomenological SU(3) chiral quark model, suggesting future experimental searches are promising.

Contribution

It introduces a novel theoretical framework to study $\bar{d}^*(2380)$ production in $\Upsilon(nS)$ decays, expanding search possibilities beyond nuclear reactions.

Findings

The study indicates a feasible chance to observe $\bar{d}^*$ in $\Upsilon(nS)$ decays.

The analysis highlights the importance of quark-meson interactions in the process.

Both pseudoscalar and vector meson contributions are significant in the scattering process.

Abstract

$d^\ast(2380)$ was observed by WASA-at-COSY collaborations in the nuclear reaction recently. Its particularly narrow width may indicate the new QCD-allowed hadronic structure. To further confirm the existence of this peculiar particle in a totally different kind of reaction, we study the opportunity for searching $\bar{d}^\ast$ in the $\Upsilon(nS)$ (with n=1, 2, 3) decay. As a phenomenological study, our framework is based on SU(3) chiral quark model. By virtue of the unitarity of $S$-matrix and crossing symmetry, we study the imaginary part of the forward scattering amplitudes between $\Upsilon(nS)$ and $d^\ast$. The scattering process is mainly governed by the quark-meson interaction. We examine both the pseudoscalar and vector meson contribution in the intermediate state. Hopefully, our results show that it's quite possible to find $\bar{d}^\ast$ in this decay mode in the future.