{"ID":23629747,"CreatedAt":"2026-09-18T07:04:54.147703138Z","UpdatedAt":"2026-09-18T07:04:54.147703138Z","DeletedAt":null,"paper_url":"https://arxiv.org/abs/2609.20654","arxiv_id":"2609.20654","title":"Line shapes of $Ω(2012)$ production in the $Ξ\\bar K $ and $Ξπ\\bar K$ decay channels","abstract":"We theoretically study the line shape of the experiment for $Ω(2012)$ production in the $Ξ^- π^+ K^-$ and $Ξ^0 K^-$ decay modes, reflecting the $Ξ^* \\bar K$ and $Ξ\\bar K$ decay modes, from the perspective that the $Ω(2012)$ is a molecular state dynamically generated from the interaction of the $Ξ^* \\bar K $ and $Ωη$, coupled channels with $Ξ\\bar K$ as a decay channel. We show the consistency of the picture with the experimental mass distributions, giving support to the molecular picture for the $Ω(2012)$ state. We also call the attention to the sensitivity of the results to the cut imposed on the $πΞ$ invariant mass, and suggest a different method to obtain the ratio $R^{Ξπ\\bar K}_{Ξ\\bar K}$ of the three-body to two-body decay widths used so far as a test of the molecular picture. We stress that the direct comparison with the experimental mass distributions done here is a more stringent test of the molecular nature of the $Ω(2012)$ state than the comparison of the ratio $R^{Ξπ\\bar K}_{Ξ\\bar K}$ which has been so far obtained using different criteria.","short_abstract":"We theoretically study the line shape of the experiment for $Ω(2012)$ production in the $Ξ^- π^+ K^-$ and $Ξ^0 K^-$ decay modes, reflecting the $Ξ^* \\bar K$ and $Ξ\\bar K$ decay modes, from the perspective that the $Ω(2012)$ is a molecular state dynamically generated from the interaction of the $Ξ^* \\bar K $ and $Ωη$, c...","url_abs":"https://arxiv.org/abs/2609.20654","url_pdf":"https://arxiv.org/pdf/2609.20654v1","authors":"[\"Natsumi Ikeno\",\"Eulogio Oset\"]","published":"2026-09-17T16:31:48Z","proceeding":"hep-ph","tasks":"[\"hep-ph\",\"hep-ex\",\"nucl-th\"]","methods":"[]","has_code":false}