Regularization Schemes and Higher Order Corrections
Presented by William KILGORE on 5 Sep 2011 from 14:50 to 15:15
Type: Parallel talk
Track: Track 3: Computations in Theoretical Physics - Techniques and Methods
I apply commonly used regularization schemes to a multiloop calculation to examine the properties of the schemes at higher orders. I find complete consistency between the conventional dimensional regularization scheme and dimensional reduction, but I find that the four-dimensional helicity scheme produces incorrect results at next-to-next-to-leading order and singular results at next-to-next-to-next-to-leading order. It is not, therefore, a unitary regularization scheme.