Abstract
We have measured the cross section for γγ production with the TOPAZ detector in the energy region √ s=50.0–61.4 GeV. The observed cross section for γγ production integrated over |cos θ| ⩽ 0.77 is 50.2±0.8±2.2 pb at 〈√ s〉=57.6 GeV and the ratio of this value to the QED prediction is 1.01±0.02±0.04. The angular distribution is in good agreement with the QED predictions, thereby setting limits on the compositeness scales, Λ L+R +=168 GeV, Λ L+R −=97 GeV, Λ L,R=141 GeV, Λ L,R −=81 GeV, and Λ L−R ±=68 GeV, at the 95% confidence level. The reaction e +e −→ γγγ was also studied and was found consistent with the QED prediction.
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