Speaker
Prof.
Yubing Dong
(Institute of High Energy Physics, Chinese Academy of Sciences, P. R. China)
Description
$d^*(2380)$ as a new dibaryon resonance was observed by WASW@COSY
experiments~\cite{Clement} recently. This discovery has triggered a great
interest to understand its intrinsic structure. In this talk, a theoretical
study of this new dibaryon with the help of the constituent chiral quark model
is briefly summarized. It is found that our approach could reasonable reproduce
the mass of $d^*$ in the coupled channel with $\Delta\Delta+CC$ (C-hidden color
component)~\cite{Yuan,Huang}. The obtained wave function for $d^*(2380)$ shows that the
system is a compact one and the probabilities are about 2/3 for the $CC$ component
and 1/3 for the $\Delta\Delta$ component, respectively. This wave function is applied
for the calculation of its partial decays, like double pion decay modes of
$d^*(2380)\to d\pi^0\pi^0$, $d\pi^+\pi^-$~\cite{Dong1}, $pn\pi^0\pi^0$,
$pn\pi^+\pi^-$~\cite{Dong2}, and single pion decay mode of
$pn \pi$~\cite{Dong3}. Our calculated double pion decay widths are in excellent agreement
with the experiments~\cite{Clement1}. The single pion decay width is also compatable
with the experimental measurement. It is again supported our compact hexaquark dominanted picture.In addition, the charge distribution of $d^*(2380)$, as another physical quantity to distinguish its structure, is also proposed and discussed~\cite{Dong4}.
Primary author
Prof.
Yubing Dong
(Institute of High Energy Physics, Chinese Academy of Sciences, P. R. China)
Co-authors
Prof.
Fei Huang
(School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, P. R. China)
Prof.
Pengnian Shen
(Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, P. R. China)
Prof.
Zongye Zhang
(Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, P. R. China)
