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Effective axial-vector coupling of gluon as an explanation to the top quark asymmetry
Phys. Rev. D 84, 054017 – Published 21 September, 2011
DOI: https://doi.org/10.1103/PhysRevD.84.054017
Abstract
We explore the possibility that the large forward-backward asymmetry measured by the CDF detector at Tevatron could be due to a universal effective axial-vector coupling of gluon. Using an effective field theory approach we show model independently how such a log-enhanced coupling occurs at 1-loop level. The interference with QCD gluon vector coupling naturally induces the observed positive forward-backward asymmetry that grows with invariant mass and is consistent with the cross section measurements. This scenario does not involve new flavor changing couplings nor operators that interfere with QCD, and, therefore, is not constrained by the LHC searches for 4-quark contact interactions. We predict top quark polarization effects that grow with energy and allow to test this scenario at the LHC. Our proposal offers a viable alternative to new physics scenarios that explain the forward-backward asymmetry anomaly with the interference between QCD and tree level new physics amplitudes.
See Also
Implications of the effective axial-vector coupling of the gluon on top-quark charge asymmetry at the LHC
Implications of effective axial-vector coupling of gluon for spin polarizations at the LHC
Article Text
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