Relic density of dark matter in the inert doublet model beyond leading order for the low mass region. II. Coannihilation

We examine the relic density of light mass dark matter region in inert doublet model (IDM) when dominant process is due to co-annihilation between lightest neutral scalars model. The full one-loop electroweak corrections are computed an on-shell scheme and found be well approximated as effective cross-section expressed terms $Z$-observables. subdominant which consists annihilation into $W$ off-shell $W$, that calculated a 3-body final state, also performed. latter reveals important dependence on parameter describes self-interaction new (solely within sector), not accessible tree-level calculations standard (SM)-IDM interactions.