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- W2077285166 abstract "We explore the possibility that the large $toverline{t}$ 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 $toverline{t}$ asymmetry that grows with $toverline{t}$ 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 $toverline{t}$ forward-backward asymmetry anomaly with the interference between QCD and tree level new physics amplitudes." @default.
- W2077285166 created "2016-06-24" @default.
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- W2077285166 date "2011-09-21" @default.
- W2077285166 modified "2023-09-25" @default.
- W2077285166 title "Effective axial-vector coupling of gluon as an explanation to the top quark asymmetry" @default.
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- W2077285166 doi "https://doi.org/10.1103/physrevd.84.054017" @default.
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