Freeze-in production of Fermionic Dark Matter with Pseudo-scalar and Phenomenological Aspects

TL;DR

This paper explores the freeze-in production mechanism of fermionic dark matter mediated by a pseudo-scalar, analyzing its relic density, experimental constraints, and potential explanations for astrophysical observations.

Contribution

It introduces a detailed analysis of pseudo-scalar mediated fermionic dark matter production via freeze-in, including thermal and non-thermal scenarios and phenomenological implications.

Findings

Relic density calculations for different model parameters.

Constraints from invisible Higgs decay at LHC.

Potential explanation for galaxy mergers and AMS-02 positron flux data.

Abstract

In this paper, we study freeze-in production of fermionic dark matter with a pseudo scalar as the mediator between dark sector and Standard Model (SM). While the fermionic DM is non-thermal, we will explain two scenarios in which production of pseudo-scalar particles are either thermal or non thermal. We'll present elaborate discussion to derive yield quantity and relic density and illustrate these values for the different range of model parameters. We'll investigate constraints on parameters space coming from invisible Higgs decay at LHC. For the case of extremely small couplings and zero mixing between SM Higgs field with pseudo scalar field which pseudo scalar boson can play role of DM, we will justify recent observation of merging galaxies with a case of self-interacting DM. We'll show that influence of DM annihilation in this case, would provide a better fit to the AMS-02 data of positron flux.