HADRON2023

The Zcs states based on the molecular picture

8 Jun 2023, 18:10

20m

DAD - Room 4H (Genova, Italy)

Contributed Exotic hadrons and candidates Exotic hadrons and candidates

Speaker

Natsumi Ikeno

Description

The $Z_{cs}$(3985) state was reported as a new exotic state by BESIII collaboration. After its discovery, the $Z_{cs}$(4000) and $Z_{cs}$(4220) states were observed at LHCb. We study the $Z_{cs}$(3985) state based on the ${\overline{D}}_s{D}^{\ast }$ with the coupled channels of the vector-pseudoscalar mesons [1]. We find that we can explain this state by the threshold effect from the coupled-channel interaction and our calculation is in fair agreement with the BESIII data. We also study the $Z_{cs}$ state based on $D_s^{\ast }{\overline{D}}^{\ast }$ with the coupled channels of the vector-vector mesons [2]. The $D_s^{\ast }{\overline{D}}^{\ast }$ system does not develop a bound state, however, the $J^P=2^{+}$ channel has enough attraction to create a strong cusp structure that shows up in the $J/\psi K^{+}$ invariant mass distribution in the $B^{+}\to J/\psi \varphi K^{+}$ decay at the $D_s^{\ast }{\overline{D}}^{\ast }$ threshold. I will give a presentation based on Refs. [1]-[2].

[1] N. Ikeno, R. Molina and E. Oset, Phys. Lett. B 814, 136120 (2021).
[2] N. Ikeno, R. Molina and E. Oset, Phys. Rev. D 105, 014012 (2022).

Presentation materials

hadron2023_Zcs_ikeno.pdf