Mass-Matching in Higgsless

TL;DR

This paper investigates Higgsless models with mass-matching between fermionic and bosonic KK resonances, analyzing their experimental signatures at the LHC and how to confirm the mass-matching mechanism crucial for their viability.

Contribution

It provides a detailed analysis of LHC signatures for Higgsless models, emphasizing how to identify the mass-matching mechanism and the implications for quark compositeness.

Findings

Fermionic resonances produce clean 2 or 4 lepton signals.

Bosonic resonances are visible in dilepton and WZ channels.

Mass measurements confirm the necessary mass-matching for S≈0.

Abstract

Modern extra-dimensional Higgsless scenarios rely on a mass-matching between fermionic and bosonic KK resonances to evade constraints from precision electroweak measurements. After analyzing all of the Tevatron and LEP bounds on these so-called Cured Higgsless scenarios, we study their LHC signatures and explore how to identify the mass-matching mechanism, the key to their viability. We find singly and pair produced fermionic resonances show up as clean signals with 2 or 4 leptons and 2 hard jets, while neutral and charged bosonic resonances are visible in the dilepton and leptonic WZ channels, respectively. A measurement of the resonance masses from these channels shows the matching necessary to achieve $S\simeq 0$. Moreover, a large single production of KK-fermion resonances is a clear indication of compositeness of SM quarks. Discovery reach is below 10 fb$^{-1}$ of luminosity for resonances in the 700 GeV range.