Confronting cosmic ray electron and positron excesses with hybrid triplet Higgs portal dark matter

TL;DR

This paper investigates scalar dark matter models with triplet Higgs extensions to explain cosmic ray electron and positron excesses, highlighting the hybrid triplet Higgs portal's effectiveness over single triplet models, especially with nearby dark matter sub-halos.

Contribution

It introduces a hybrid triplet Higgs portal framework that better explains cosmic ray excesses compared to single triplet models, considering neutrino mass orderings and local dark matter sub-halos.

Findings

Hybrid triplet Higgs portal explains AMS-02 positron excess effectively.

Resonant peak and excess in DAMPE data are well modeled with nearby dark matter sub-halo.

Hybrid framework is favored across different neutrino mass orderings.

Abstract

We perform a detailed study of scalar dark matter with triplet Higgs extensions of the Standard Model in order to explain the cosmic ray electron and positron excesses reported by AMS-02 and DAMPE. A detailed analysis of AMS-02 positron excess reveals that for different orderings (normal, inverted and quasi-degenerate) of neutrino mass, the hybrid triplet Higgs portal framework is more favored with respect to the single triplet Higgs portal for TeV scale dark matter. We also show that the resonant peak and continuous excess in DAMPE cosmic ray data can be well explained with the hybrid triplet Higgs portal dark matter when a dark matter sub-halo nearby is taken into account.