%0 Journal Article
%T Spin degeneracy in multi-hadron systems with a heavy quark
%A S. Yasui
%A K. Sudoh
%A Y. Yamaguchi
%A S. Ohkoda
%A A. Hosaka
%A T. Hyodo
%J Physics
%D 2013
%I arXiv
%R 10.1016/j.physletb.2013.10.019
%X We study multi-hadron systems with a single heavy quark (charm or bottom) in the limit of heavy quark mass. The spin degeneracy of the states with quantum numbers $(j+1/2)^{P}$ and $(j-1/2)^{P}$ for $j \neq 0$, known in a normal hadron, can be generalized to multi-hadron systems. The spin degeneracy is the universal phenomena for any multi-hadron systems with a single heavy quark, irrespective of their internal structures, including compact multi-quarks, hadronic molecules and exotic nuclei. We demonstrate the spin degeneracy in the hadronic systems formed by a heavy hadron effective theory; $P^{(\ast)}N$ states with a $P^{(\ast)}=\bar{D}^{(\ast)}$, $B^{(\ast)}$ meson and a nucleon $N$, and a $P^{(\ast)}$ meson in nuclear matter.
%U http://arxiv.org/abs/1304.5293v2