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

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arxiv hep-ex/0303006 v1 pith:N24GQBHI submitted 2003-03-07 hep-ex

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

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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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Cited by 5 Pith papers

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