Observation of a near-threshold enhancement in th p pbar mass spectrum from radiative J/psi-->gamma p pbar decays

Details Observation of a near-threshold enhancement in th p pbar mass spectrum from radiative J/psi-->gamma p pbar decays Observation of a near-threshold enhancement in th p pbar mass spectrum from radiative J/psi-->gamma p pbar decays

2003-03-07

arxiv.org/abs/hep-ex/0303006v1

Phys.Rev.Lett.91:022001,2003

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 4 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.91.022001

We observe a narrow enhancement near 2mp in the invariant mass spectrum of ppbar pairs from radiative J/psi-->gamma ppbar decays. The enhancement can be fit with either an S- or P-wave Breit Wigner fuction. In the case of the S-wave fit, the peak mass is below the 2mp threshold and the full width is less than 30 MeV. These mass and width values are not consistent with the properties of any known meson resonance.

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