QCD Corrections to Static Heavy Quark Form Factors

TL;DR

Second-order QCD corrections to static form factors of heavy quarks with electroweak gauge bosons turn out to be sizable and need to be taken into account in searches for new anomalous coupling effects.

Abstract

Interactions of heavy quarks, in particular of top quarks, with electroweak gauge bosons are expected to be very sensitive to new physics effects related to electroweak symmetry breaking. These interactions are described by the so-called static form factors, which include anomalous magnetic moments and the effective weak charges. We compute the second-order QCD corrections to these static form factors, which turn out to be sizeable and need to be taken into account in searches for new anomalous coupling effects.