Annihilation of Secluded Dark Matter into W+W- Enhanced by P-wave Sommerfeld Effect

Abstract

We propose that a pair of annihilation of the secluded dark matter may accommodate a source of the halo gamma ray signal reported recently, through the p-wave Sommerfeld enhancement. We show that given a weakly coupling of the dark sector to the Higgs bosons, the dark matter annihilation into W+W-, even though induced at 1-loop level, is desirably amplified. We also argue that the supersymmetric framework may readily embody such a model within rather minimal contents.

Figures (2)

• Figure 1: The DM annihilation cross section, including the $p$-wave Sommerfeld effect, is displayed.
• Figure 2: $\Gamma_{ann}/H$ is peaked at $\epsilon_v \simeq \epsilon_{21}$, although the DM remains out of thermal equilibrium.