“School of Physic”

Back to Papers Home
Back to Papers of School of Physic

Paper   IPM / Physic / 15525
School of Physics
  Title:   Dark Matter Decaying into Millicharged Particles as a Solution to AMS 02 Positron Excess
1.  Y. Farzan
2.  M. Rajaee
  Status:   Published
  Journal: JCAP
  Vol.:  2019
  Year:  2019
  Supported by:  IPM
The positron excess observed by PAMELA and then confirmed by AMS 02 has intrigued the particle physics community since 2008. Various dark matter decay and annihilation models have been built to explain the excess. However, the bounds from isotropic gamma ray disfavor the canonical dark matter decay scenario. We propose a solution to this excess based on the decay of dark matter particles into intermediate millicharged particles which can be trapped by the galactic magnetic field. The subsequent decay of the millicharged particles to electron positron in our vicinity can explain the excess. Since these particles diffuse out of halo before decay, their contribution to the isotropic gamma ray background is expected to be much smaller than that in canonic dark matter decay scenarios. We show that the model is testable by direct dark matter search experiments

Download TeX format
back to top
scroll left or right