1. IE browser is NOT supported anymore. Please use Chrome, Firefox or Edge instead.
2. If you are a new user, please register to get an IHEP SSO account through https://login.ihep.ac.cn/registlight.jsp Any questions, please email us at helpdesk@ihep.ac.cn or call 88236855.
3. If you need to create a conference in the "Conferences, Workshops and Events" zone, please email us at helpdesk@ihep.ac.cn.
4. The max file size allowed for upload is 100 Mb.

Interpretation of the $\eta_1(1855)$ as a $K\bar{K}_1(1400)+ c.c.$ molecule

16 Aug 2022, 14:45
25m

Speaker

Xiang-Kun Dong (ITP, CAS)

Description

An exotic state with $J^{PC}=1^{-+}$, denoted by $\eta_1(1855)$, was observed by BESIII collaboration recently in $J/\psi \to \gamma \eta\eta^\prime$. The fact that its mass is just below the threshold of $K\bar{K}_1(1400)$ stimulates us to investigate whether this exotic state can be interpreted as a $K\bar{K}_1(1400)+ c.c.$ {molecule or not}. Using the one boson exchange model, we show that it is possible for $K\bar{K}_1(1400)$ with $J^{PC}=1^{-+}$ to bind together by taking the momentum cutoff $\Lambda\sim 2~\rm GeV$ and yield the same binding energy as the experimental value when $\Lambda\approx 2.5~\rm GeV$. In this molecular picture, the predicted branch ratio $\mathrm{Br}(\eta_1(1855)\to\eta\eta^\prime) \approx 15\%$ is consistent with the experimental results, which again supports the molecular explanation of $\eta_1(1855)$. Relevant systems, namely $K\bar{K}_1(1400)$ with $J^{PC}=1^{--}$ and $K\bar{K}_1(1270)$ with $J^{PC}=1^{-\pm}$, are also investigated, some of which can be searched for in the future experiments.

Category talk

Primary author

Xiang-Kun Dong (ITP, CAS)

Co-authors

Prof. Bingsong ZOU (ITP, CAS) Yong-Hui Lin (Helmholtz Institute for Radiation and Nuclear Physics, University of Bonn)

Presentation materials