Bounding wide composite vector resonances at the LHC

TL;DR

This paper explores how composite Higgs models predict wide vector resonances that decay into top partners, and reinterprets existing LHC data to set bounds on these scenarios, highlighting increased fine-tuning in the top sector.

Contribution

It demonstrates the reinterpretation of CMS SS2l analysis to cover wide vector resonances decaying into top partners in composite Higgs models.

Findings

CMS SS2l analysis has significant coverage for wide vector resonances.

13 TeV LHC run can improve search reach for these resonances.

Presence of these resonances increases fine-tuning in the top sector.

Abstract

In composite Higgs models (CHMs), electroweak precision data generically push colourless composite vector resonances to a regime where they dominantly decay into pairs of light top partners. This greatly attenuates their traces in canonical collider searches, tailored for narrow resonances promptly decaying into Standard Model final states. By reinterpreting the CMS same-sign dilepton (SS2$\ell$) analysis at the Large Hadron Collider (LHC), originally designed to search for top partners with electric charge $5/3$, we demonstrate its significant coverage over this kinematical regime. We also show the reach of the 13 TeV run of the LHC, with various integrated luminosity options, for a possible upgrade of the SS2$\ell$ search. The top sector of CHMs is found to be more fine-tuned in the presence of colourless composite resonances in the few TeV range.