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Observation of a New Narrow Charmonium State in Exclusive B+-->K+ pi+pi- J/psi Decays

We report the first observation of a narrow charmmonium state produced in the exclusive decay process B+->K+ pi+pi- J/psi. This state, which decays into pi+pi-J/psi, has a mass of 3871.8+-0.7(stat)+-0.4(syst) MeV, which is very near the M_D + M_D* mass threshold. The results are based on an analysis of 152M BBbar events collected at the Upsilon(4S) resonance in the Belle detector at the KEKB collider.

preprint2003arXivOpen access
The Belle CollaborationK. Abe
hep-ex
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The Belle CollaborationK. Abe

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