THE SPECTRUM OF THE O ( g 4 ) SCALE - INVARIANT LIPATOV KERNEL
نویسنده
چکیده
The scale-invariant O(g4) Lipatov kernel has been determined by t-channel unitarity. The forward kernel responsible for parton evolution is evaluated and its eigenvalue spectrum determined. In addition to a logarithmic modification of the O(g2) kernel a distinct new kinematic component appears. This component is infra-red finite without regularization and has the holomorphic factorization property necessary for conformal invariance. It gives a reduction (of ∼ 65αs/π 2 ∼ 0.15) in the power growth of parton distributions at small-x. ∗Work supported by the U.S. Department of Energy, Division of High Energy Physics, Contract W-31-109-ENG-38
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