Reanalysis of the newly observed ${\Omega }^{\ast }$ state in hadronic molecule model

Abstract

After the discovery of the new ${\Omega }^{\ast }$ 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.

arXiv comment8pages, 6figures

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Cited by in corpus (10)

• Hidden-charm pentaquarks with triple strangeness due to the ${\Omega }_c^{(\ast )}{\bar{D}}_s^{(\ast )}$ interactions
• Newly observed $X(4630)$: a new charmoniumlike molecule
• Can $\Omega (2012)$ be explained as a molecular state?
• Understanding the nature of $\Omega (2012)$ in a coupled-channel approach
• Analysis of $\Omega (2012)$ as a molecule in the chiral quark model
• Further understanding the nature of $\Omega (2012)$ within a chiral quark model
• Evidence for Two Excited ${\Omega }^{-}$ Hyperons
• Structure of the ${\Omega }^{-}(2012)$ with Hamiltonian Effective Field Theory
• Observation of the $\Omega$(2012) baryon at the LHC
• Radiative decays of the $\Omega (2012)$ as a hadronic molecule