The Ratio of the Direct Photon Production Cross Section at 630 GeV and at 1800 GeV
msra（2007）
摘要
We measure the ratio of the isolated direct photon prodution cross section at √ s = 630 GeV/c2 to that at √ s = 1800 GeV/c2 for the central (|�| < 0.9) and forward (1.6 < |�| < 2.5) rapidity regions. We compare the result with next to leading order QCD predictions using CTEQ parton distribution functions.
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