Vector-like quarks: status and new directions at the LHC

TL;DR

This paper explores the impact of new decay channels involving scalars on vector-like quark searches at the LHC, emphasizing the importance of large widths and interaction strengths, and reviews recent experimental constraints and future strategies.

Contribution

It introduces a comprehensive analysis of vector-like quark decays into both standard and exotic states, expanding the search strategies beyond traditional decay channels.

Findings

New decay channels reduce Standard Model branching ratios.

Large widths and interaction strengths significantly influence observability.

Updated LHC constraints on vector-like quark models post-Moriond 2024.

Abstract

Experimental searches for vector-like quarks have until now only considered their decays into Standard Model particles. However, various new physics scenarios predict additional scalars, so that these vector-like quarks can decay to new channels. These new channels reduce the branching ratios into Standard Model final states, significantly affecting current mass bounds. In this article, we quantitatively assess the relevance and observability of single and pair production processes of vector-like quarks, followed by decays into both standard and exotic final states. We highlight the importance of large widths and the relative interaction strengths with Standard Model particles and new scalars. Then, we review the post-Moriond 2024 status of these models in light of available LHC data and discuss potential future strategies to enhance the scope of vector-like quark searches.