title: Top quark forward-backward asymmetry in e+ e- annihilation at next-to-next-to-leading order in QCD.
abstract: We report on a complete calculation of electroweak production of top-quark pairs in e+ e- annihilation at next-to-next-to-leading order in quantum chromodynamics. Our setup is fully differential in phase space and can be used to calculate any infrared-safe observable. Especially we calculated the next-to-next-to-leading-order corrections to the top-quark forward-backward asymmetry and found sizable effects. Our results show a large reduction of the theoretical uncertainties in predictions of the forward-backward asymmetry, and allow for a precision determination of the top-quark electroweak couplings at future e+ e- colliders.
authors.affiliation: Department of Physics, Southern Methodist University, Dallas, Texas 75275-0175, USA and High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: Jun
authors.initials: J
authors.lastname: Gao
authors.affiliation: SLAC National Accelerator Laboratory, Stanford University, Stanford, California 94309, USA.
authors.forename: Hua Xing
authors.initials: HX
authors.lastname: Zhu