Exclusion and discovery via Drell-Yan in the 4DCHM

TL;DR

This paper investigates how finite width and interference effects influence the detection of multiple Z' bosons in the 4DCHM at hadron colliders, highlighting the importance of these factors in complex BSM scenarios.

Contribution

It provides a detailed analysis of finite width and interference effects in the 4DCHM, emphasizing their significance for experimental searches involving multiple wide Z' resonances.

Findings

Finite width and interference effects significantly impact Z' boson signals.

Multiple Z' states can lead to complex interference patterns.

Decays to non-SM fermions can produce large resonance widths.

Abstract

Searches for Z' bosons are most sensitive in the dilepton channels at hadron colliders. Whilst finite width and interference effects do affect the modifications the presence of BSM physics makes to Standard Model (SM) contributions, generic searches are often designed to minimize these. The experimental approach adopted works well in the case of popular models that predict a single and narrow Z' boson allowing these effects to effectively be neglected. Conversely, finite width and interference effects may have to be taken into account in experimental analyses when such Z' states are wide or where several states are predicted. We explore the consequences of these effects in the 4-Dimensional Composite Higgs Model (4DCHM) which includes multiple new Z' bosons and where the decays of these resonances to non-SM fermions can result in large widths.