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Observation of an alternative chi_(c0)(2P) candidate in e^+ e^- rightarrow J/psi D bar{D}
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Observation of an alternative chi_(c0)(2P) candidate in e^+ e^- rightarrow J/psi D bar{D}
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We perform a full amplitude analysis of the process $e^+ e^- \rightarrow J/\psi D \bar{D}$, where $D$ refers to either $D^0$ or $D^+$. A new charmoniumlike state $X^*(3860)$ that decays to $D \bar{D}$ is observed with a significance 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 level of $2.5\sigma$. The analysis is based on the 980 $\mathrm{fb}^{-1}$ data sample collected by the Belle detector at the asymmetric-energy $e^+ e^-$ collider KEKB.
Forward citations
Cited by 2 Pith papers
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Heavy and heavy-light mesons with arbitrary spin and parity in the Covariant Spectator Theory
A Covariant Spectator Theory with eight fitted parameters reproduces the heavy and heavy-light meson spectrum up to spin 3 and assigns quantum numbers to new B_c, B_s, and D_s states.
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Hadronic Molecules and $\chi_{cJ}(2P)$ Coupled States
A coupled-channel model mixing χ_cJ(2P) cores with D(*)D(*) hadrons describes X(3872) as mostly molecular while X(3860) and Z(3930) have larger compact components and predicts a 0++ state.
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