Infrared Factorization, Wilson Lines and the Heavy Quark Limit
G. P. Korchemsky, A. V. Radyushkin
Abstract
It is shown that, in QCD, the same universal function Γcusp(, α) determines the infrared behaviour of the on-shell quark form factor, the velocity-dependent anomalous dimension in the heavy quark effective field theory (HQET) and the renormalization properties of the vacuum averaged Wilson lines with a cusp. It is demonstrated that a combined use of the methods developed in the relevant different branches of quantum field theory essentially facilitates the all-order study of the asymptotic and analytic properties of this function.
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