# Hypercharged Naturalness

## TL;DR

This paper introduces a twin-Higgs model with hypercharged twin particles, exploring its unique phenomenological signatures such as long-lived charged particles, twin glueballs, and twin-quarkonium, with implications for collider detection.

## Contribution

It presents a minimal symmetry twin-Higgs model with hypercharged twin particles and analyzes its distinctive collider signatures and detection prospects.

## Key findings

- Twin particles carry hypercharge and are mirror partners of the Standard Model.
- Twin top quarks can form bound states and decay into dileptons or Higgs plus gauge bosons.
- Twin glueballs and quarkonium can be long-lived or stable, producing displaced decays or diphoton signals.

## Abstract

We present an exceptional twin-Higgs model with the minimal symmetry structure for an exact implementation of twin parity along with custodial symmetry. Twin particles are mirrors of the Standard Model yet they carry hypercharge, while the photon is identified with its twin. We thoroughly explore the phenomenological signatures of hypercharged naturalness: long-lived charged particles, a colorless twin top with electric charge $2/3$ that once pair-produced, bounds via twin-color interactions and can annihilate to dileptons or a Higgs plus a photon or a $Z$, and glueballs produced from Higgs decays and twin-quarkonium annihilation that either decay displaced, or are stable on collider scales and eventually decay to diphotons. Prospects for detection of these signatures are also discussed.