Light $Z'$ Signatures at the LHC

TL;DR

This paper explores a distinctive LHC signal involving Higgs decay into light Z' bosons that could explain anomalies and be detectable in upcoming collider runs.

Contribution

It introduces a novel Higgs decay channel into light Z' bosons within a model that explains the Atomki anomaly and remains consistent with current experimental constraints.

Findings

Potentially observable cross section at LHC Run 3

Light Z' can explain Atomki anomaly

Model consistent with electron and muon AMMs

Abstract

In this work, we discuss a distinctive $pp\to {\rm Higgs}\to Z'Z'\to 4l$ ($l=e,\mu$) signal at the Large Hadron Collider (LHC), where the `Higgs' label refers to the SM-like Higgs state discovered in 2012 or a lighter one in the framework of a theoretical model embedding a spontaneously broken $U(1)'$ symmetry in addition to the Standard Model (SM) gauge group. The additional $U(1)'$ symmetry generates a very light $Z'$ state, with both vector and axial (non-universal) couplings to fermions, which are able to explain the so-called Atomki anomaly, compliant with current measurements of the Anomalous Magnetic Moments (AMMs) of electron and muon as well as beam dump experiments. We show that the cross section for this process should be sufficiently large to afford one with significant sensitivity during Run 3 of the LHC.