Probing the Colour Structure of the Top Quark Forward-Backward Asymmetry
arXiv:1309.0810 · doi:10.1007/JHEP11(2013)105
Abstract
We point out that QCD coherence effects can help to identify the colour structure of possible new physics contributions to the anomalously large forward-backward asymmetry in top quark pair production. New physics models that yield the same inclusive asymmetry make different predictions for its dependence on the transverse momentum of the pair, if they have different colour structures. From both a fixed-order effective field theory approach and Monte Carlo studies of specific models, we find that an s-channel octet structure is preferred.
22 pages, 10 figures, 6 tables, published in JHEP
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- NNLO QCD predictions for fully-differential top-quark pair production at the Tevatron
- NLO QCD corrections to W+ W- b anti-b production with leptonic decays in the light of top quark mass and asymmetry measurements
- Renormalization group-induced phenomena of top pairs from four-quark effective operators
- Correlation of top asymmetries: loop versus tree origins
- Top-quark forward-backward asymmetry from a color-octet t-channel resonance
- Top-quark Polarization and Asymmetries at the LHC in the Effective Description of Squark Interactions