English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The positron excess observed by PAMELA and then confirmed by AMS 02 hasintrigued the particle physics community since 2008. Various dark matter decayand annihilation models have been built to explain the excess. However, thebounds from isotropic gamma ray disfavor the canonical dark matter decayscenario. We propose a solution to this excess based on the decay of darkmatter particles into intermediate millicharged particles which can be trappedby the galactic magnetic field. The subsequent decay of the millichargedparticles to electron positron in our vicinity can explain the excess. Sincethese particles diffuse out of halo before decay, their contribution to theisotropic gamma ray background is expected to be much smaller than that incanonic dark matter decay scenarios. We show that the model is testable bydirect dark matter search experiments.

Dark Matter Decaying into Millicharged Particles as a Solution to AMS 02 Positron Excess