LHC Signatures of Warped-space Vectorlike Quarks

TL;DR

This paper investigates the LHC signatures of TeV scale vectorlike quarks in warped extra-dimensional models, emphasizing both pair and single production channels, and proposes methods to measure their electroweak couplings.

Contribution

It introduces new production channels for vectorlike quarks and provides model-independent analysis methods for their detection and coupling measurement at the LHC.

Findings

Identified new $gg$-initiated pair and single production channels.

Estimated luminosity needed for discovery at the LHC.

Proposed a cut to extract electroweak couplings.

Abstract

We study the LHC signatures of TeV scale vectorlike quarks $b'$, $t'$ and $\chi$ with electromagnetic charges -1/3, 2/3 and 5/3 that appear in many beyond the standard model (BSM) extensions. We consider warped extra-dimensional models and analyze the phenomenology of such vectorlike quarks that are the custodial partners of third generation quarks. In addition to the usually studied pair-production channels which depend on the strong coupling, we put equal emphasis on single production channels that depend on electroweak couplings and on electroweak symmetry breaking induced mixing effects between the heavy vectorlike quarks and standard model quarks. We identify new promising $gg$-initiated pair and single production channels and find the luminosity required for discovering these states at the LHC. For these channels, we propose a cut that allows one to extract the relevant electroweak couplings. Although the motivation is from warped models, we present many of our results model-independently.