The gauge technique for heavy quarks
arXiv:hep-ph/9612242 · doi:10.1103/PhysRevD.56.27
Abstract
It is possible to determine a propapagator for heavy quarks to order 1/m in any covariant gauge, which applies universally to all quarks, by using the gauge technique. The leading behaviour is given by a _0F_2 function and the result is reliable in the infrared limit, accounting for soft-gluon corrections to the quark in internal loops.
12 pages, RevTex format. Typographical errors corrected (factors of 2 in eqs 25 and 26)