Reanalysis of the newly observed $\Omega^*$ state in hadronic molecule model

TL;DR

This paper reanalyzes the newly observed $ ext{Omega}^*$ state, exploring P-wave molecular interpretations and finding compatibility with certain spin-parity assignments based on recent experimental decay ratios.

Contribution

It investigates P-wave molecular models for $ ext{Omega}^*$, providing a new perspective that aligns with recent experimental decay data, contrasting with previous S-wave interpretations.

Findings

Compatibility of $1/2^+$ and $3/2^+$ $ar{K} ext{Xi}(1530)$ molecules with experimental data

Disfavoring the $5/2^+$ molecular interpretation due to decay patterns

Support for $ ext{Omega}^*$ as a P-wave molecular state with specific spin-parity assignments

Abstract

After the discovery of the new $\Omega^{*}$ state, the ratio of the branching fractions of $\Omega(2012)\to \bar{K}\pi\Xi$ relative to $\bar{K}\Xi$ decay channel was investigated by the Belle Collaboration recently. The measured $11.9\%$ up limit on this ratio is in sharp tension with the $S$-wave $\bar{K}\Xi(1530)$ molecule interpretation for $\Omega(2012)$ which indicates the dominant $\bar{K}\pi\Xi$ three-body decay. In the present work, we try to explore the possibility of the $P$-wave molecule assignments for $\Omega(2012)$ (where $\Omega(2012)$ has positive parity). It is found that the latest experimental measurements are compatible with the $1/2^+$ and $3/2^+$ $\bar{K}\Xi(1530)$ molecular pictures, while the $5/2^+$ $\bar{K}\Xi(1530)$ molecule shows the larger $\bar{K}\pi\Xi$ three-body decay compared with the $\bar{K}\Xi$ decay as the case of $S$-wave molecule. Thus, the newly observed $\Omega(2012)$ can be interpreted as the $1/2^+$ or $3/2^+$ $\bar{K}\Xi(1530)$ molecule state according to current experiment data.