# Collider Signals of the Mirror Twin Higgs through the Hypercharge Portal

## TL;DR

This paper explores collider signals from kinetic mixing in the Mirror Twin Higgs model, showing potential for discovering twin photons and Z bosons at the LHC or future colliders through dilepton resonances.

## Contribution

It analyzes the collider phenomenology of hypercharge portal mixing in the Mirror Twin Higgs model, including experimental bounds and discovery prospects for twin gauge bosons.

## Key findings

- Current bounds on hypercharge mixing are established.
- Twin photon and Z can be discovered via dilepton resonances at colliders.
- Measuring masses and event rates can test the model's predictions.

## Abstract

We consider the collider signals arising from kinetic mixing between the hypercharge gauge boson of the Standard Model and its twin counterpart in the Mirror Twin Higgs model, in the framework in which the twin photon is massive. Through the mixing, the Standard Model fermions acquire charges under the mirror photon and the mirror Z boson. We determine the current experimental bounds on this scenario, and show that the mixing can be large enough to discover both the twin photon and the twin Z at the LHC, or at a future 100 TeV hadron collider, with dilepton resonances being a particularly conspicuous signal. We show that, in simple models, measuring the masses of both the mirror photon and mirror Z, along with the corresponding event rates in the dilepton channel, overdetermines the system, and can be used to test these theories.