Massive dark photons in a Higgs portal model

TL;DR

This paper explores an extension of the Standard Model featuring a hidden sector with a massive dark photon, a scalar, and a fermion, analyzing their interactions and implications for future electron-positron collider experiments.

Contribution

It introduces a Higgs portal model with a massive dark photon and hidden sector particles, detailing their interactions and potential collider signatures.

Findings

The model predicts a massive dark photon arising from scalar interactions.

Interactions between hidden sector particles and the Standard Model are mediated by the scalar.

Potential signals for dark photons at future $e^-e^+$ colliders are discussed.

Abstract

An extension of the Standard Model with a hidden sector which consists of gauge singlets (a Dirac fermion $\chi$ and a scalar $S$) plus a vector boson $V_\mu$ (dark massive photon) is studied. The singlet scalar interacts with the Standard Model sector through the triple and quartic scalar interactions, while the singlet fermion and vector boson field interact with the Standard Model only via the singlet scalar. The scalar field generates the vector boson's mass. Perspectives for future $e^{-}e^{+}$ colliders is considered.