Journal Article

PUBDB-2021-02169

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Dark matter models for the 511 keV galactic line predict keV electron recoils on Earth

Ema, Y.DESY* ; Sala, F. (Corresponding author)Extern* ; Sato, R.DESY*

2021
Springer Heidelberg

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Please use a persistent id in citations: doi:10.1140/epjc/s10052-021-08899-y  doi:10.3204/PUBDB-2021-02169

Report No.: DESY-20-120; arXiv:2007.09105

Abstract: We propose models of Dark Matter that account for the 511 keV photon emission from the Galactic Centre, compatibly with experimental constraints and theoretical consistency, and where the relic abundance is achieved via $p$-wave annihilations or, in inelastic models, via co-annihilations. Due to the Dark Matter component that is inevitably upscattered by the Sun, these models generically predict keV electron recoils at detectors on Earth, and could naturally explain the excess recently reported by the XENON1T collaboration. The very small number of free parameters make these ideas testable by detectors like XENONnT and Panda-X, by accelerators like NA64 and LDMX, and by cosmological surveys like the Simons observatory and CMB-S4. As a byproduct of our study, we recast NA64 limits on invisibly decaying dark photons to other particles.

Keyword(s): electron: recoil ; photon: emission ; galaxy ; dark matter: relic density ; dark matter: annihilation ; observatory ; accelerator

Note: v2: clarifications and references added

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. DFG project 390833306 - EXC 2121: Quantum Universe (390833306) (390833306)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2021

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