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arXiv · hep-ex/0308029

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

The Belle Collaboration·K. Abe
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Abstract

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.

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The Belle Collaboration, K. Abe. 2003-08-10. Observation of a New Narrow Charmonium State in Exclusive B+-->K+ pi+pi- J/psi Decays. https://doi.org/10.1103/physrevlett.91.262001

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