Journal
PHYSICS LETTERS B
Volume 800, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2019.135104
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Funding
- Ministry of Science and Technology (MoST) of Taiwan [107-2119-M-001-030, 107-2119-M-001-033]
- Independent Research Fund Denmark [DFF 6108-00623]
- Danish National Research Foundation [DNRF90]
- National Science Foundation [PHY-1607611]
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We study the loop-induced circularly polarized gamma rays from dark matter annihilation using the effective dark matter theory approach. Both neutral scalar and fermionic dark matter annihilating into monochromatic diphoton and Z-photon final states are considered. To generate the circular polarization asymmetry, P and CP symmetries must be violated in the couplings between dark matter and Standard Model fermions inside the loop with non-vanishing Cutkosky cut. The asymmetry can be sizable especially for Z-photon final state for which asymmetry of nearly 90% can be reached. We discuss the prospect for detecting the circular polarization asymmetry of the gamma-ray flux from dark matter annihilation in the Galactic Center in future gamma-ray polarimetry experiments. (C) 2019 The Authors. Published by Elsevier B.V.
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