Speaker
William Kilgore
(Brookhaven National Lab)
Description
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.
Author
William Kilgore
(Brookhaven National Lab)
