Could $Z_c(3900)$ be a $I^G{J}^P=1^{+}{1}^{+}$ $D^{\ast }\bar{D}$ molecular state?

Chun-Yu Cui, Xin-Hua Liao, Yong-Lu Liu +1

We investigate the nature of the recently observed narrow resonance $Z_c(3900)$, which is assumed to be a $D^{\ast }\bar{D}$ molecular state with quantum numbers $I^{G}J^{P}=1^{+}1^{…