Dark photons in the Dalitz-like decay of a scalar

TL;DR

This paper investigates the decay of a scalar boson into a photon and a dark photon, setting limits on the dark photon mass and mixing, and estimating its mass at approximately 4.5 MeV.

Contribution

It introduces a model for dark photon production via scalar decay and derives constraints on dark photon properties without dependence on the dilaton mass.

Findings

Estimated dark photon mass at 4.5 MeV

Set upper limits on dark photon mass and mixing strength

Derived decay rates for scalar to photon and dark photon

Abstract

The couplings of the Standard Model sector to the scale invariant degrees of freedom can open the possibility to study dark photons (DP). The Dalitz-like decay of the (Higgs-like) scalar boson into a single photon and DP is studied. The interaction between DP and quarks is mediated by the derivative of the scalar field - the dilaton, the virtual (fictitious) state. The mass of the dilaton does not enter the final solutions. 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.