# Oscillating Composite Asymmetric Dark Matter

## TL;DR

This paper explores composite asymmetric dark matter models with a focus on indirect detection constraints, highlighting how gamma-ray and electron/positron flux searches can test these models.

## Contribution

It introduces a composite ADM model linked with the seesaw mechanism and examines its indirect detection signatures and constraints.

## Key findings

- Composite ADM can be tested via gamma-ray observations.
- The model predicts detectable electron/positron fluxes.
- Late-time pair-annihilation is induced by tiny Majorana masses.

## Abstract

The asymmetric dark matter (ADM) scenario can solve the coincidence problem between the baryon and the dark matter (DM) abundance when the DM mass is of ${\cal O}(1)\,$GeV. In the ADM scenarios, composite dark matter is particularly motivated, as it can naturally provide the DM mass in the ${\cal O}(1)\,$GeV range and a large annihilation cross section simultaneously. In this paper, we discuss the indirect detection constraints on the composite ADM model. The portal operators connecting the $B-L$ asymmetries in the dark and the Standard Model(SM) sectors are assumed to be generated in association with the seesaw mechanism. In this model, composite dark matter inevitably obtains a tiny Majorana mass which induces a pair-annihilation of ADM at late times. We show that the model can be efficiently tested by the searches for the $\gamma$-ray from the dwarf spheroidal galaxies and the interstellar electron/positron flux.