Effects of the FCNC couplings in production of new heavy quarks within Z' models at the LHC

TL;DR

This paper investigates how flavor changing neutral current couplings of new heavy quarks mediated by Z' models affect production rates at the LHC, providing cross section estimates for different models and parameters.

Contribution

It offers the first detailed analysis of FCNC effects on heavy quark production in various Z' models at the LHC, including cross section calculations and parameter space exploration.

Findings

Cross sections range from 1.2 to 5.8 fb depending on the Z' model.

Sensitivity improves with flavor tagging techniques.

Analysis constrained by current mass limits on heavy quarks and Z' bosons.

Abstract

We study the flavor changing neutral current couplings of new heavy quarks through the Z' models at the LHC. We calculate the cross sections for the signal and the corresponding standard model background processes. Considering the present limits on the mass of new heavy quarks and the Z' boson, we performed an analysis to investigate the parameter space (mixing and mass) through different Z' models. For an FCNC mixing parameter x=0.1 and the Z' mass M_{Z'}=2000 GeV, and new heavy quark mass m_{t'}=700 GeV at the LHC with \sqrt{s}=13 TeV, we find the cross section for single production of new heavy quarks associated with top quarks as 5.8 fb, 3.3 fb, 1.5 fb and 1.2 fb within the Z'_{\eta} , Z'_{\psi} , Z'_{LP} and Z'_{\chi} models, respectively. It is shown that the sensitivity would benefit from the flavor tagging.