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

Physical Review Letters

Journal ISSN

1079-7114

Volume

102

Digital Object Identifier (DOI)

10.1103/PhysRevLett.102.232003

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