Department
Physics
Document Type
Article
Publication Date
6-12-2009
Abstract
I present results for two-loop soft anomalous dimensions for heavy quark production which control soft-gluon resummation at next-to-next-to-leading-logarithm accuracy. I derive an explicit expression for the exact result and study it numerically for top quark production via e(+) e(-) -> t (t) over bar t, and I construct a surprisingly simple but very accurate approximation. I show that the two-loop soft anomalous dimensions with massive quarks display a simple proportionality relation to the one-loop result only in the limit of vanishing quark mass. I also discuss the extension of the calculation to single top and top pair production in hadron colliders.
Journal Title
Physical Review Letters
Journal ISSN
1079-7114
Volume
102
Digital Object Identifier (DOI)
10.1103/PhysRevLett.102.232003