Observation of a narrow charmonium-like state in exclusive B+ -> K+ pi+pi- J/psi decays

Details Observation of a narrow charmonium-like state in exclusive B+ -> K+ pi+pi- J/psi decays Observation of a narrow charmonium-like state in exclusive B+ -> K+ pi+pi- J/psi decays

2003-09-08

arxiv.org/abs/hep-ex/0309032v2

Phys.Rev.Lett.91:262001,2003

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages 4 figures, submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.91.262001

We report the observation of a narrow charmonium-like 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 3872.0+-0.6(stat)+-0.5(syst) MeV, a value that is very near the M_D + M_D* mass threshold. The results are based on an analysis of 152M B-Bbar events collected at the Upsilon(4S) resonance in the Belle detector at the KEKB collider. The statistical significance of the signal is in excess of 10 sigma.

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