Top quark pair production and asymmetry at the Tevatron and LHC in left-right models

Creative Commons License

Frank M., Hayreter A., Turan İ.

PHYSICAL REVIEW D, cilt.84, 2011 (SCI İndekslerine Giren Dergi) identifier identifier


In light of the recent measurements of the top quark forward-backward asymmetry at the Fermilab Tevatron experiment, which in some regions of the parameter space shows a discrepancy of 3 sigma compared to the standard model prediction, we analyze top quark pair production and asymmetry in the context of left-right models both at the Tevatron and Large Hadron Collider (LHC). We use the minimal manifest left-right model and an asymmetric left-right model where gauge couplings and flavor mixing in the right-handed sector are allowed to differ from those in the left-handed sector. We explore the consequences of including effects from W-R and Z(R) gauge bosons, consistent with phenomenological constraints from meson mixing and new bounds from ATLAS and CMS, for the t (t) over bar cross section, invariant mass distribution and forward-backward asymmetry at the Tevatron, and predict their values at the LHC. We show that, choosing parameter benchmarks for the model while preserving agreement with collider, electroweak precision, and flavor-violation data, the generic left-right model cannot account for the large deviations of the observed asymmetry at the Tevatron and also that it predicts very small charge asymmetries at the LHC.