ar X iv : h ep - p h / 03 07 14 5 v 1 1 0
نویسنده
چکیده
with k → 0 the gluon momentum, p the quark momentum after emission of the gluon, v a dimensionless vector v ∝ p, and I have omitted overall factors of gs T c F with g 2 s = 4παs and T c F the generators of SU(3) in the fundamental representation. The eikonal approximation has numerous phenomenological applications in QCD, including threshold resummations for a variety of QCD processes [1, 2, 3, 4, 5, 6]. In these applications we are mainly interested in the ultraviolet (UV) pole structure (in dimensional regularization) of one-loop, two-loop, and higherloop eikonal vertex corrections. In this talk, I discuss explicit calculations of one-loop and two-loop eikonal vertex corrections for diagrams with massive and massless partons and show that the n-loop UV poles are given simply in terms of the one-loop result [7].
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