Effective axial-vector coupling of gluon as an explanation to the top quark asymmetry
arXiv:1106.4553 · doi: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.
Few small changes in the text, same as published version, 5 pages, 2 figures
References in corpus (15)
- Top Quarks, Axigluons and Charge Asymmetries at Hadron Colliders
- Search for New Physics in Dijet Mass and Angular Distributions in pp Collisions at sqrt(s) = 7 TeV Measured with the ATLAS Detector
- Threshold Resummation for the Top Quark Charge Asymmetry
- Non-resonant New Physics in Top Pair Production at Hadron Colliders
- Probing the Tevatron t tbar asymmetry at LHC
- LHC Predictions from a Tevatron Anomaly in the Top Quark Forward-Backward Asymmetry
- Massive color-octet bosons and the charge asymmetries of top quarks at hadron colliders
- Measurement of Dijet Angular Distributions and Search for Quark Compositeness in pp Collisions at 7 TeV
- Top polarization, forward-backward asymmetry and new physics
- Longitudinal top polarization as a probe of a possible origin of forward-backward asymmetry of the top quark at the Tevatron
- New physics effects on top quark spin correlation and polarization at the LHC: a comparative study in different models
- Search for same-sign top-quark pair production at sqrt(s) = 7 TeV and limits on flavour changing neutral currents in the top sector
- Implications of the CDF t\bar{t} Forward-Backward Asymmetry for Boosted Top Physics
- Implications of the CDF t \bar t Forward-Backward Asymmetry for Hard Top Physics
- New Color-Octet Vector Boson Revisit
Cited by in corpus (22)
- Measurement of the charge asymmetry in top-quark pair production in proton-proton collisions at sqrt(s) = 7 TeV
- Asymmetries in top quark pair production at hadron colliders
- Phenomenology of a light gluon resonance in top-physics at Tevatron and LHC
- Inclusive and differential measurements of the t t-bar charge asymmetry in pp collisions at sqrt(s) = 8 TeV
- Testing new physics models by top charge asymmetry and polarization at the LHC
- Tevatron Top Versus LHC Top Physics
- Implications of the effective axial-vector coupling of gluon on top-quark charge asymmetry at the LHC
- Very Light Axigluons and the Top Asymmetry
- Anomalous Top Couplings at Hadron Colliders Revisited
- Top A_FB at the Tevatron vs. charge asymmetry at the LHC in chiral U(1) flavor models with flavored Higgs doublets
- Diagnosing the top-quark angular asymmetry using LHC intrinsic charge asymmetries
- Non-standard top substructure
- Top quark forward-backward asymmetry and charge asymmetry in left-right twin Higgs model
- Top Quark Pair Production and Asymmetry at the Tevatron and LHC in Left-Right Models
- Top quark forward-backward asymmetry and W^prime bosons
- Same-sign Tops: A Powerful Diagnostic Test for Models of New Physics
- Next-to-leading order QCD effect of on top quark Forward-Backward Asymmetry
- New physics contributions to the forward-backward asymmetry at the Tevatron
- Implications of effective axial-vector coupling of gluon for spin polarizations at the LHC
- Top-quark forward-backward asymmetry from a color-octet t-channel resonance
- Study the Forward-Backward Asymmetry of the Top Quark Production in the Randall-Sundrum Model with an Extension of Strong Interaction
- LHC and Tevatron constraints on a W' model interpretation of the top quark forward-backward asymmetry