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[en] We report on the decay to two photons of the χc0(1 3P0) charmonium resonance formed in p-bar p interactions at Fermilab experiment E835. We have measured the product of branching ratios BR(χc0→p-bar p)xBR(χc0→γγ)=(6.52±1.18(stat)+0.48-0.72(sys))x10-8. Using values from the 2002 PDG, this measurement leads to the partial width Γ(χc0→γγ)=2.9±0.9 keV.
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