6533b830fe1ef96bd129689d
RESEARCH PRODUCT
Top-pair forward-backward asymmetry beyond next-to-leading order
Matthias NeubertAndrea FerrogliaValentin AhrensLi Lin YangBen D. Pecjaksubject
Quantum chromodynamicsPhysicsNuclear and High Energy PhysicsParticle physics530 Physics010308 nuclear & particles physicsmedia_common.quotation_subjectHigh Energy Physics::PhenomenologyOrder (ring theory)01 natural sciencesAsymmetryGluonNuclear physicsPair production10231 Institute for Computational Science0103 physical sciencesHigh Energy Physics::ExperimentRapidityInvariant mass3106 Nuclear and High Energy Physics3101 Physics and Astronomy (miscellaneous)Resummation010306 general physicsmedia_commondescription
We make use of recent results in effective theory and higher-order perturbative calculations to improve the theoretical predictions of the QCD contribution to the top-quark pair production forward-backward asymmetry at the Tevatron. In particular, we supplement the fixed-order next-to-leading order calculation with higher-order corrections from soft-gluon resummation at next-to next-to-leading order accuracy performed in two different kinematic schemes, which allows us to make improved predictions for the asymmetry in the $p\overline{p}$ and $t\overline{t}$ rest frames as a function of the rapidity and invariant mass of the $t\overline{t}$ pair. Furthermore, we provide binned results which can be compared with the recent measurements of the forward-backward asymmetry in events with a large pair invariant mass or rapidity difference. Finally, we calculate at $\mathrm{NLO}+\mathrm{NNLL}$ order the top-quark charge asymmetry at the LHC as a function of a lower rapidity cutoff for the top and antitop quarks.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-10-04 | Physical Review D |