Large - Angle Two - Photon Exclusive Channels in Quantum
نویسندگان
چکیده
Detailed leading order QCD predictions are given for the scaling, angular, and helicity dependence of the reactions yy -f 6 (M=r, K, p, etc.) at large momentum transfer. In addition to providing a basic test of QCD at short distances, measurements can be used to determine the process-independent meson distribution amplitudes $M(x,Q). Other related two-photon channels such as yy+yp, y*y+rO, no, n' and nc+yy are also discussed. We also prove the existence of a fixed Regge singularity at J=O which couples to yp-fyp in the t-channel but not yTT+y7T.
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