Speaker
Yasuhiro Yamaguchi
(R)
Description
Hadron as an impurity bound in nuclei causes interesting phenomena which
do not emerge in normal nuclei.
These effects would give us the information not only on the internal
structure of the nuclei, but also on the changing properties of the
impurity in the nuclear medium.
The hadron-nucleus systems have been studied in the light flavor
sector, especially.
However, a strong attraction between a heavy meson ($\bar{D}$ and $B$)
and a nucleon, provided by the one pion exchange potential (OPEP), was
suggested recently.
The OPEP is enhanced by the heavy quark spin symmetry which induces the
mass degeneracy between the heavy pseudoscalar and vector mesons.
The attraction motivates us to investigate the $\bar{D}$ ($B$) nuclei
having the exotic flavor structure.
Hence, these bound states are stable against the strong decay.
We discuss the possible existence of exotic few-body states realized as
$\bar{D}NN$ and $BNN$.
The OPEP between the $\bar{D}$ $(B)$ meson and the nucleon $N$
is considered.
By solving coupled channel equations for $PNN$ and $P^\ast NN$
channels ($P$ ($P^\ast$) is the heavy pseudoscalar (vector) meson),
we obtain bound states and resonances.
In these states, the tensor force of the OPEP plays an
important role to yield the attraction.
