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We report the first observation of a new charmonium state at a mass of$(3.943 \pm 0.006 \pm 0.006) {GeV}/c^2$. This state, called X(3940), isobserved in the process $e^+ e^- \to J/\psi X(3940)$ in the spectrum of massesrecoiling against a reconstructed $J/\psi$. We also observe the decay of theX(3940) into $D^* \bar{D}$ and measure the intrinsic width of this state to beless than $52 MeV/c^2$ at the 90% C.L. These results are obtained from a $350fb^{-1}$ data sample collected with the Belle detector near the $\Upsilon(4S)$resonance, at the KEKB asymmetric energy $e^+ e^-$ collider.Comment: BELLE-CONF-051

physical review letters

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Observation of a Charmoniumlike State Produced in Association with aJ/ψine+e−Annihilation at<…