Novel gamma-ray features from dark matter cascade processes involving scalars and fermions as intermediate states

14th International Conference on Topics in Astroparticle and Underground Physics

物理学;天文学

Lopez-Gehler, Sergio^1,2

Physik-Department T30d, Technische Universität München, James-Franck-Strabe 1, Garching

D-85748, Germany^1

Excellence Cluster Universe, Technische Universität München, Boltzmannstrabe 2, Garching

D-85748, Germany^2

关键词: Cascade process;    Dark matter;    Dirac fermions;    Final state photons;    Intermediate state;    Majorana;    Relativistic effects;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/718/4/042037/pdf
DOI  :  10.1088/1742-6596/718/4/042037

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

We present novel gamma-ray features that are almost exclusively a consequence of kinematical considerations in one-step cascade processes. These features arise from relativistic effects on final state photons from decaying intermediate states. Depending on the spin of the intermediate state the specific shape of the signal varies: a scalar or Majorana fermion intermediate state produces gamma-ray boxes, whereas a Dirac fermion intermediate state produces gamma-ray triangles. We refer to physical realisations that produce such features. Finally, we illustrate their strong constraining power using data drawn from the Fermi-LAT instrument.