Top A_{FB} and charge asymmetry in flavor-dependent chiral U(1)' model

TL;DR

This paper explores a flavor-dependent chiral U(1)' model that explains top quark asymmetries observed at Tevatron and LHC while remaining consistent with LHC constraints on same-sign top production.

Contribution

It introduces a specific U(1)' charge assignment and Higgs sector to simultaneously address top asymmetries and collider constraints.

Findings

The model can explain both Tevatron and LHC top asymmetries.

Predicted same-sign top production remains below experimental limits.

Parameter regions exist where the model is consistent with current data.

Abstract

We study the flavor-dependent chiral U(1)' model where only the right-handed up-type quarks are charged under U(1)$^\prime$ and additional Higgs doublets charged with U(1)' charges are introduced to give proper Yukawa interactions. We find that in some parameter regions, this model is not accommodated only with the top forward-backward asymmetry at the Tevatron, but also with the charge asymmetry at the LHC. At the same time, the cross section for the same-sign top-quark pair production in this model could be below the upper limit at the LHC.