Observation of an alternative ${\chi }_{c0}(2P)$ candidate in $e^{+}{e}^{-}\to J/\psi D\bar{D}$

Belle Collaboration, K. Chilikin, I. Adachi +167

We perform a full amplitude analysis of the process $e^{+}{e}^{-}\to J/\psi D\bar{D}$, where $D$ refers to either $D^0$ or $D^{+}$. A new charmoniumlike state $X^{\ast }(3860)$ that decay…