Radiative decays of the isoscalar $S$-wave $D\bar{D}$ molecule

Yuan-Jun Gao, Gang Li, Shi-Dong Liu +1

In the hadronic molecular picture, an isoscalar $S$-wave $D\bar{D}$ molecule is naturally expected as the spin-0 partner of $X(3872)$. Assuming this state, denoted by $X_0$, to be…