Journal
PHYSICS OF THE DARK UNIVERSE
Volume 34, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.dark.2021.100909
Keywords
Dark matter; Indirect detection; Circular polarisation
Categories
Funding
- F.R.S.-FNRS, Belgium through the MISU convention [F.6001.19]
- European Union's Horizon 2020 research and innovation programme as part of the Marie Sklodowska-Curie Innovative Training Network MCnetITN3 [722104]
- Fond de la Recherche Scientifique de Bel-gique (F.R.S.-FNRS) , Belgium [2.5020.11]
- Walloon Region
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This study argues that photon polarisation is an important feature for understanding new physics interactions and improving sensitivity to dark matter. It explores the possibility of generating circular polarisation from interactions beyond the Standard Model, highlighting the potential for high levels of circular polarisation in gamma rays from the Galactic Center.
Conventional indirect dark matter (DM) searches look for an excess in the electromagnetic emission from the sky that cannot be attributed to known astrophysical sources. Here, we argue that the photon polarisation is an important feature to understand new physics interactions and can be exploited to improve our sensitivity to DM. In particular, circular polarisation can be generated from Beyond the Standard Model interactions if they violate parity and there is an asymmetry in the number of particles which participate in the interaction. In this work, we consider a simplified model for fermionic (Majorana) DM and study the circularly polarised gamma rays below 10 GeV from the scattering of cosmic ray electrons on DM. We calculate the differential flux of positive and negative polarised photons from the Galactic Center and show that the degree of circular polarisation can reach up to 90%. Finally, once collider and DM constraints have been taken into account, we estimate the required sensitivity from future experiments to detect this signal finding that, although a distinctive peak will be present in the photon flux spectrum, a near future observation is unlikely. However, different sources or models not considered in this work could provide higher intensity fluxes, leading to a possible detection by e-ASTROGAM. In the event of a discovery, we argue that the polarisation fraction is a valuable characterisation feature of the new sector. (c) 2021 Elsevier B.V. All rights reserved.
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