8–10 Mar 2021
Yukawa Institute for Theoretical Physics, Kyoto University
Asia/Tokyo timezone

Theoretical study of $\Omega(2012)$ and $Z_{cs}(3985)$ with the coupled channels approach

9 Mar 2021, 21:00
20m
Panasonic hall (Yukawa Institute for Theoretical Physics, Kyoto University)

Panasonic hall

Yukawa Institute for Theoretical Physics, Kyoto University

Speaker

Natsumi Ikeno (Tottori University)

Description

I report the results for $\Omega(2012)$ and $Z_{cs}(3985)$ of Refs.[1,2]. We have studied the $\Omega(2012)$ which was measured in the Belle experiment. We conduct a study of the interaction of the $\bar K \Xi^*$, $\eta \Omega$($s$-wave) and $\bar K \Xi$($d$-wave) channels within a coupled channel unitary approach. We find that all data including the Belle experiment on $\Gamma_{\Omega^* \to \pi \bar K \Xi}/ \Gamma_{\Omega^* \to \bar K \Xi}$, are compatible with the molecular picture stemming from meson baryon interaction of these channels. We also have studied the $e^+ e^- \to K^+ ( D_s^{*-} D^0 + D_s^- D^{*0})$ reaction recently measured at BESIII, from where a new exotic $Z_{cs}$ state has been reported. We study the interaction of $\bar D_s D^*$ with the coupled channels $J/\psi K^-$, $K^{*-} \eta_c$, $D_s^- D^{*0}$, $D_s^{*-} D^0$. The coupled channels help to build up strength in the $D_s^- D^{*0}+ D_s^{*-} D^0$ diagonal scattering matrix close to threshold and, although the interaction is not strong enough to produce a bound state or resonance, it is sufficient to produce a large accumulation of strength at the $\bar D_s D^*$ threshold in the $e^+ e^- \to K^+ ( D_s^{*-} D^0 + D_s^- D^{*0})$ reaction in agreement with experiment. [1] N. Ikeno, G. Toledo and E. Oset, Phys. Rev. D \textbf{101}, 094016 (2020). [2] N. Ikeno, R. Molina and E. Oset, arXiv:2011.13425 [hep-ph].

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