Measurement Of The Gamma Cross Section At D0 Using Dimuons

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Measurement of The[gamma] Cross Section at D0 Using Dimuons
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The D0 experiment has measured the[gamma] differential cross section in p[bar p] collisions at[radical]s= 1.8 TeV for[vert-bar]y[sup[gamma]][vert-bar]0.7. We find the measured cross section to be a factor of five larger than the O([alpha][sub s][sup 3]) QCD prediction for p[sub T][sup[gamma]] 5 GeV/c.