Observation of an alternative χc0(2P) candidate in e+e−→J/ψDD¯

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Abstract

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

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