Multiple Higgs-Portal and Gauge-Kinetic Mixings

TL;DR

This paper presents a formalism for analyzing multiple Higgs-portal and gauge-kinetic mixings between the Standard Model and hidden sectors, relevant for dark matter and string theories, with both analytical and numerical insights.

Contribution

It introduces a comprehensive phenomenological framework for multiple mixing effects, including scalar and gauge sectors, with analytical control and numerical illustrations.

Findings

Mixing effects can be expressed in closed form or controlled via perturbation.

Masses and mixings are numerically illustrated for key processes.

The formalism applies to dark matter models and string-inspired theories.

Abstract

We develop a phenomenological formalism for mixing effects between the Standard Model and hidden-sector fields, motivated by dark matter in the Universe as well as string theories. The scheme includes multiple Higgs-portal interactions in the scalar sector as well as multiple gauge-kinetic mixings in the abelian gauge sector. While some of the mixing effects can be cast in closed form, other elements can be controlled analytically only by means of perturbative expansions in the ratio of standard scales over large hidden scales. Higgs and vector-boson masses and mixings are illustrated numerically for characteristic processes.