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We explore the capability of the Tevatron and LHC to place limits on thepossible existence of flavor-independent $q \bar q \gamma\gamma$ contactinteractions which can lead to an excess of diphoton events with largeinvariant masses. Assuming no departure from the Standard Model is observed, weshow that the Tevatron will eventually be able to place a lower bound of0.5-0.6 TeV on the scale associated with this new contact interaction. At theLHC, scales as large as 3-6 TeV may be probed with suitable detector cuts andan integrated luminosity of $100 fb^{-1}$.Comment: LaTex, 12pages plus 5 figures(available on request), SLAC-PUB-657

Diphoton production at hadron colliders and new contact interactions