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- W1479784872 abstract "We observe a narrow enhancement near 2m_p in the invariant mass spectrum of pbar{p} pairs from radiative J/psi-->gamma pbar{p} decays. No similar structure is seen in J/psi-->pi0 pbar{p} decays. The results are based on an analysis of a 58 million event sample of J/psi decays accumulated with the BESII detector at the Beijing electron-positron collider. The enhancement can be fit either with an S- or P-wave Breit Wigner resonance function; in the case of the S-wave fit, the peak mass is below 2m_p at M=1859 +3 -10(stat) +5 -25 (syst) MeV/c**2 and the total width is Gamma < 30 MeV/c**2, at the 90% confidence level. These mass and width values are not consistent with the properties of any known resonance." @default.
- W1479784872 created "2016-06-24" @default.
- W1479784872 creator A5051581351 @default.
- W1479784872 date "2003-05-17" @default.
- W1479784872 modified "2023-09-25" @default.
- W1479784872 title "Observation of a narrow, near-threshold enhancement in the p(p-bar) mass spectrum from radiative J/psi to gamma p(p-bar) decays" @default.
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