Probing topcolor-assisted technicolor from top charge asymmetry and triple-top production at the LHC

TL;DR

This paper investigates a topcolor-assisted technicolor (TC2) model's effects on top quark asymmetries and triple-top production at the LHC, showing it can explain Tevatron asymmetry data and predict observable signals at the LHC.

Contribution

The study provides a comprehensive analysis of TC2's impact on top quark observables, linking Tevatron and LHC measurements, and predicts sizable triple-top production as a novel test of the model.

Findings

TC2 can explain Tevatron $A_{FB}$ within 2σ

TC2 significantly enhances LHC $A_{C}$ within current bounds

Triple-top production can reach 16 pb at 14 TeV LHC

Abstract

In a topcolor-assisted technicolor model (TC2) with large FCNC top quark couplings, we study its correlated contributions to the top quark forward-backward asymmetry ($A_{FB}$) at the Tevatron, the top charge asymmetry ($A_{C}$) and the triple-top production at the LHC. Under current constraints on the top quark from the LHC and Tevatron(such as the total and differential production rates), we scan the parameter space of such a TC2 model. We find that in the allowed parameter space the TC2 model can explain the Tevatron measured $A_{FB}$ at $2\sigma$ level, but meanwhile significantly enhance $A_{C}$ at the LHC. Such enhanced $A_{C}$, albeit currently allowed by the LHC measurement at $2\sigma$ level, will serve as a test of TC2 with the improvement of measurement precision at the LHC. Then with all the constraints (including the requirement to explain $A_{FB}$ at $2\sigma$ level and satisfying the current LHC measurement of $A_{C}$ at $2\sigma$ level), we find that the TC2 model can induce sizable triple-top production at the 14 TeV LHC (the production rate can maximally reach 16 pb). Due to the low SM backgrounds, the triple-top production can also be a good probe for TC2 model, complementary to $A_{C}$.