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We perform a full amplitude analysis of the process $e^+ e^- \rightarrowJ/\psi D \bar{D}$, where $D$ refers to either $D^0$ or $D^+$. A newcharmoniumlike state $X^*(3860)$ that decays to $D \bar{D}$ is observed with asignificance of $6.5\sigma$. Its mass is ($3862^{+26}_{-32}{}^{+40}_{-13}$)MeV/$c^2$ and width is ($201^{+154}_{-67}{}^{+88}_{-82}$) MeV. The$J^{PC}=0^{++}$ hypothesis is favored over the $2^{++}$ hypothesis at the levelof $2.5\sigma$. The analysis is based on the 980 $\mathrm{fb}^{-1}$ data samplecollected by the Belle detector at the asymmetric-energy $e^+ e^-$ colliderKEKB.

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