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arXiv · 2212.02783

Understanding the nature of $\Omega(2012)$ in a coupled-channel approach

Qi-Fang Lü·Hideko Nagahiro·Atsushi Hosaka
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Abstract

We perform a systematic analysis of the mass and strong decays of the $\Omega(2012)$ resonance in a coupled-channel approach of a bare three-quark state and a composite meson-baryon state. Besides the coupling of the bare state and $\Xi^* \bar K$ channel, the effective meson-baryon interactions are also included. We find a pole with mass of $2008$ MeV by solving the Bethe-Salpeter equation. The calculated decay widths and its ratios of branching fractions $\mathcal {R}_{\Xi \bar K}^{\Xi \pi \bar K}$ agree well with the new experimental measurement by Belle Collaboration. Our results suggest that both three-quark core and $\Xi^* \bar K$ channel are essential for the description of the $\Omega(2012)$ resonance. We expect that present calculations can help us to better understand the nature of $\Omega(2012)$ resonance.

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Qi-Fang Lü, Hideko Nagahiro, Atsushi Hosaka. 2022-12-06. Understanding the nature of $\Omega(2012)$ in a coupled-channel approach. https://doi.org/10.1103/physrevd.107.014025

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