Tevatron Asymmetry of Tops in a W',Z' Model

TL;DR

This paper explains the observed top-pair asymmetry at the Tevatron using a new Asymmetric Left-Right Model featuring W' and Z' bosons with specific masses and couplings, predicting testable signals at the LHC.

Contribution

The paper introduces a novel ALRM with specific gauge symmetry breaking and fermion couplings to explain top asymmetry, providing detailed parameter values and decay predictions.

Findings

Model explains Tevatron top asymmetry data.

Predicted W' and Z' signals at the LHC.

Specific masses and widths for new gauge bosons.

Abstract

Recent results from the CDF Collaboration indicate the the top-pair forward-backward asymmetry is largest in regions of high rapidity difference $|\Delta y|$ and invariant mass $M_{t\bar t}.$ We show that experimental observations can be explained by our previously proposed Asymmetric Left-Right Model (ALRM). The gauge symmetry $U'(1)\times SU'(2)\times SU(2)$ is broken by a triplet Higgs in the primed sector. The $W'$ boson has a $(t,d)$ right-handed coupling and the $Z'$ boson has diagonal fermion couplings. We determine the model parameters to be $M_{W'} = 700$ GeV, $M_{Z'}=1$ TeV, and charged current coupling $g'_2=3$. The $W'$ and $Z'$ total decay widths are of $\mathcal{O}(100$ GeV). The signals from $Z'\to t\bar t$ and $W'\to tb$ at the LHC will test the model.