Recent J/ψ Results from BESII


There is an accumulation of evidence for anomalous behavior in the pp̄ system near 2mp mass threshold. We analyze J/ψ → γpp̄ with BESII J/ψ data 2. Fig. 1 shows the pp̄ invariant mass distribution for selected events. Except for a peak near Mpp̄ = 2.98 GeV/c 2 that is consistent in mass, width, and yield with expectations for J/ψ → γηc, ηc → pp̄ 3 and a… (More)


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