# Unification of the Standard Model and Dark Matter Sectors in [SU(5)$\times$U(1)]$^4$

## TL;DR

This paper proposes a unified [SU(5)×U(1)]^4 gauge theory model that integrates the Standard Model and dark matter sectors, explaining dark matter properties and addressing anomalies in B-decay experiments.

## Contribution

It introduces a novel chiral [SU(5)×U(1)]^4 gauge framework that unifies SM and dark matter, with implications for cosmology and particle physics anomalies.

## Key findings

- Realizes self-interacting dark matter to solve small-scale structure issues.
- Addresses the LHCb B-decay anomaly within the unified model.
- Predicts specific low-energy gauge interactions relevant for experiments.

## Abstract

A simple model of dark matter contains a light Dirac field charged under a hidden U(1) gauge symmetry. When a chiral matter content in a strong dynamics satisfies the t'Hooft anomaly matching condition, a massless baryon is a natural candidate of the light Dirac field. One realization is the same matter content as the standard SU(5)$\times$U(1)$_{(B-L)}$ grand unified theory. We propose a chiral [SU(5)$\times$U(1)]$^4$ gauge theory as a unified model of the SM and DM sectors. The low-energy dynamics, which was recently studied, is governed by the hidden U(1)$_4$ gauge interaction and the third-family U(1)$_{(B-L)_3}$ gauge interaction. This model can realize self-interacting dark matter and alleviate the small-scale crisis of collisionless cold dark matter in the cosmological structure formation. The model can also address the semi-leptonic $B$-decay anomaly reported by the LHCb experiment.