Light dark matter from dark sector decay

Antideuterons from Dark Matter Decay

Recent observations of a large excess of cosmic-ray positrons at high energies have raised a lot of interest in leptonic decay modes of dark matter particles. Nevertheless, dark matter particles in the Milky Way halo could also decay hadronically, producing not only a flux of antiprotons but also a flux of antideuterons. We show that for certain choices of parameters the antideuteron flux from ...

Bright Light from Dark Matter

Light Chiral Dark Sector

An interesting possibility for dark matter is a scalar particle of mass of order 10 MeV – 1 GeV, interacting with a U(1) gauge boson (dark photon) which mixes with the photon. We present a simple and natural model realizing this possibility. The dark matter arises as a composite pseudo Nambu-Goldstone boson (dark pion) in a non-Abelian gauge sector, which also gives a mass to the dark photon. F...

Neutralino dark matter from heavy axino decay

Ki-Young Choi, 2, ∗ Jihn E. Kim, † Hyun Min Lee, ‡ and Osamu Seto § Departamento de F́ısica Teórica C-XI, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain Instituto de F́ısica Teórica UAM/CSIC, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain 3 Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea Department of Physics, Carnegie Mello...

Light Higgsino Dark Matter

We re–investigate the question whether a light higgsino–like neutralino is a viable Dark Matter candidate. To this end we compute the dominant one–loop corrections to the masses of the higgsino–like states in the minimal Supersymmetric Standard Model (MSSM), due to loops involving heavy quarks and their superpartners. We also calculate analogous corrections to the couplings of higgsino–like neu...