Revisiting the $\Omega (2012)$ as a hadronic molecule and its strong decays

Abstract

Recently, the Belle collaboration measured the ratios of the branching fractions of the newly observed $\Omega (2012)$ excited state. They did not observe significant signals for the $\Omega (2012)\to \bar{K}{\Xi }^{\ast }(1530)\to \bar{K}\pi \Xi$ decay, and reported an upper limit for the ratio of the three body decay to the two body decay mode of $\Omega (2012)\to \bar{K}\Xi$. In this work, we revisit the newly observed $\Omega (2012)$ from the molecular perspective where this resonance appears to be a dynamically generated state with spin-parity $3/2^{-}$ from the coupled channels interactions of the $\bar{K}{\Xi }^{\ast }(1530)$ and $\eta \Omega$ in $s$-wave and $\bar{K}\Xi$ in $d$-wave. With the model parameters for the $d$-wave interaction, we show that the ratio of these decay fractions reported recently by the Belle collaboration can be easily accommodated.

arXiv commentPublished version. Published in Eur.\ Phys.\ J.\ C {\bf 80}, 361 (2020)

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Cited by in corpus (16)

• QCD and the Strange Baryon Spectrum
• Theoretical study of the $\Omega (2012)$ state in the ${\Omega }_c^0\to {\pi }^{+}\Omega (2012{)}^{-}\to {\pi }^{+}(\bar{K}\Xi {)}^{-}$ and ${\pi }^{+}(\bar{K}\Xi \pi {)}^{-}$ decays
• Theoretical study of the process $D_s^{+}\to {\pi }^{+}{K}_S^0{K}_S^0$ and the isovector partner of $f_0(1710)$
• Toward discovering the excited $\Omega$ baryons through nonleptonic weak decays of ${\Omega }_c$
• Interpretation of the ${\Omega }_c\to {\pi }^{+}\Omega (2012)\to {\pi }^{+}(\bar{K}\Xi )$ relative to ${\Omega }_c\to {\pi }^{+}\bar{K}\Xi$ from the $\Omega (2012)$ molecular perspective
• 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
• Observation of $\Omega (2012{)}^{-}\to \Xi (1530)\bar{K}$ and measurement of the effective couplings of $\Omega (2012{)}^{-}$ to $\Xi (1530)\bar{K}$ and $\Xi \bar{K}$
• 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
• Interactions of the Pseudoscalar Meson Octet and the Baryon Decuplet in the Continuum and a Finite Volume
• Investigation on the $\Omega (2012)$ from QCD sum rules