# Non-Abelian Vector Boson as FIMP Dark Matter

## TL;DR

This paper demonstrates a freeze-in mechanism for non-abelian vector boson dark matter within an extended Standard Model, exploring its production, stability, and observational constraints, and highlighting its unique collider signatures.

## Contribution

It introduces a novel freeze-in dark matter scenario with a non-abelian vector boson in an extended SM, including scalar and neutrino mass generation sectors.

## Key findings

- Scalar decay channels significantly contribute to DM production.
- The model's parameter space aligns with CMB, BBN, and AMS-02 constraints.
- Distinct collider signatures differentiate freeze-in from freeze-out DM scenarios.

## Abstract

In this analysis we demonstrate the freeze-in realization of a non-abelian vector boson dark matter (DM). We choose to elaborate an existing $SU(2)_N$ extension ($N$ stands for neutral) of the Standard Model (SM) with an additional $U(1)=S^{'}$ global symmetry, which stabilizes the vector boson ($X,\bar{X}$) as DM through unbroken $S=T_{3N}+S^{'}$ and as lightest odd $S$ particle. The analysis reveals that the contribution to the freeze-in production of DM from the decay of a heavier scalar bidoublet $\zeta_1^{0,\pm} \to \zeta_2^{0,\pm}X$ is important even after the freeze-out of $\zeta_1^{0,\pm}$ in equilibrium with thermal bath. Moreover, the neutral component of $SU(2)_N$ scalar triplet ($\Delta$), responsible for neutrino mass generation in this framework, turns out to serve as additional DMs in the model and offers a multipartite freeze-in DM set up to explore. The allowed parameter space is obtained after estimating constraints from CMB, BBN and AMS-02 bound. This exercise nicely complements the freeze-out realization of ($X,\bar{X}$) as weakly interacting massive particle (WIMP) and distinguishes it through stable charge track signature at collider compared to leptonic signal excess as found in WIMP scenario.