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Observation of a new charmonium state in double charmonium production in e+ e- annihilation at \sqrt{s} ~ 10.6 GeV

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arxiv hep-ex/0507019 v3 pith:MQDYFKH6 submitted 2005-07-04 hep-ex

classification hep-ex
keywords statecharmoniumobservationannihilationasymmetricbellecalledcollected
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

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), is observed in the process $e^+ e^- \to J/\psi X(3940)$ in the spectrum of masses recoiling against a reconstructed $J/\psi$. We also observe the decay of the X(3940) into $D^* \bar{D}$ and measure the intrinsic width of this state to be less than $52 MeV/c^2$ at the 90% C.L. These results are obtained from a $350 fb^{-1}$ data sample collected with the Belle detector near the $\Upsilon(4S)$ resonance, at the KEKB asymmetric energy $e^+ e^-$ collider.

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Cited by 2 Pith papers

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