Electroweak Symmetry Breaking and WIMP-FIMP Dark Matter

TL;DR

This paper investigates a two-component dark matter model influenced by electroweak symmetry breaking, analyzing how freeze-in and freeze-out processes occur before or after EWSB and their implications for relic density and experimental constraints.

Contribution

It introduces a novel two-component dark matter framework with correlated freeze-in and freeze-out processes affected by EWSB, exploring distinct scenarios and their phenomenological implications.

Findings

Distinct parameter space features identified for freeze-in and freeze-out before and after EWSB.

Relic density constraints and XENON1T limits applied to the model.

Some results are model-independent and can inform broader dark matter studies.

Abstract

Electroweak Symmetry Breaking (EWSB) is known to produce a massive universe that we live in. However, it may also provide an important boundary for freeze-in or freeze-out of dark matter (DM) connected to Standard Model via Higgs portal as processes contributing to DM relic differ across the boundary. We explore such possibilities in a two-component DM framework, where a massive $U(1)_X$ gauge boson DM freezes-in and a scalar singlet DM freezes-out, that inherits the effect of EWSB for both the cases in a correlated way. Amongst different possibilities, we study two sample cases; first when one DM component freezes in and the other freezes out from thermal bath both necessarily $before$ EWSB and the second, when both freeze-in and freeze-out occur $after$ EWSB. We find some prominent distinctive features in the available parameter space of the model for these two cases, after addressing relic density and the recent most direct search constraints from XENON1T, some of which can be borrowed in a model independent way.