Discovery and Mass Spectroscopy via Mixed Di-Boson Production at the LHC in a 4-Site Model with a Composite Higgs Boson

TL;DR

This paper explores the potential of the LHC to detect new gauge bosons in a 4-site model with a composite Higgs by analyzing mixed di-boson production events with three leptons and missing energy, demonstrating the feasibility of resonance reconstruction and comparing detection channels.

Contribution

It introduces a detailed analysis of mixed di-boson production as a novel search channel for new gauge bosons in a 4-site composite Higgs model at the LHC, including resonance reconstruction techniques.

Findings

Mixed di-boson production is a viable detection channel at the LHC.

Resonance reconstruction of new gauge bosons is feasible with dedicated cuts.

The mixed di-boson mode surpasses charged di-boson mode at higher gauge boson masses.

Abstract

We investigate the scope of the Large Hadron Collider (LHC) in probing the parameter space of a 4-Site (4S) model supplemented by one composite Higgs state. We concentrate on the yield of `mixed' di-boson production giving three leptons and missing (transverse) energy in the final state, i.e., events induced via the sub-process $q\bar q' -> l^+\nu_l l^{'+}l^{'-}$ + ${\rm{c.c.}}$, where $q,q'$ are quarks and $l,l'=e,\mu$ in all possible combinations, signature which enables the production in the intermediate steps of all additional -- with respect to the Standard Model (SM) -- neutral and charged gauge bosons belonging to the spectrum of this scenario, all of which in resonant topologies. We not only find this channel to be accessible over the background but also show that, after a dedicated cut-based analysis, kinematical reconstruction of all such resonances is always possible. We finally compare the yield of the mixed di-boson mode to that of the `charged' di-boson one and find that the former is of lesser scope than the latter at smaller gauge boson masses but it overcomes it at higher values, thereby revealing itself a viable search mode covering new regions of parameter space.