Dark photons in the decay of Higgs-like boson

TL;DR

This paper investigates the role of dark photons in Higgs-like boson decays within a hidden sector model, setting limits on dark photon properties and estimating its mass at approximately 4.5 MeV.

Contribution

It introduces a model connecting dark photons to Higgs-like decays through a hidden sector with scale invariance breaking, providing new estimates and constraints.

Findings

Dark photon mass estimated at 4.5 MeV

Upper limits set on dark photon mass and mixing strength

Model links dark photons to Higgs-like boson decay processes

Abstract

We study the dark matter particle, the dark photon (DP), in the decay of the Higgs-like boson. The nature of dark matter is maintained through the hidden sector including the effects of breaking of the scale invariance. The model is based on the additional $U^{\prime}(1)$ gauge group associated with light DP. The interaction between DP and quarks is mediated by the derivative of the scalar - the dilaton. The latter appears in the conformal sector which triggers the electroweak symmetry breaking. Upper limits are set on the DP mass, the mixing strength between the standard photon and DP. The model does allow to estimate the DP mass with the value of 4.5 MeV. The maximal value of the scale invariance breaking constant is also reported.