Searching for dark photon dark matter with cosmic ray antideuterons
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Springer
Received: November 1, Revised: March 18, Accepted: April 25, Published: May 18,
2019 2020 2020 2020
Lisa Randall and Weishuang Linda Xu Department of Physics, Harvard University, 17 Oxford St., Cambridge, MA 02138, U.S.A.
E-mail: [email protected], [email protected] Abstract: Low energy antideuteron detection presents a unique channel for indirect detection, targeting dark matter that annihilates into hadrons in a relatively background-free way. Since the idea was first proposed, many WIMP-type models have already been disfavored by direct detection experiments, and current constraints indicate that any thermal relic candidates likely annihilate through some hidden sector process. In this paper, we show that cosmic ray antideuteron detection experiments represent one of the best ways to search for hidden sector thermal relic dark matter, and in particular investigate a vector portal dark matter that annihilates via a massive dark photon. We find that the parameter space with thermal relic annihilation and mχ > mA0 & 20 GeV is largely unconstrained, and near future antideuteron experiment GAPS will be able to probe models in this space with mχ ≈ mA0 up to masses of O(100 GeV). Specifically the dark matter models favored by the Fermi Galactic center excess is expected to be detected or constrained at the 5(3)−σ level assuming a optimistic (conservative) propagation model. Keywords: Beyond Standard Model, Cosmology of Theories beyond the SM ArXiv ePrint: 1910.14669
c The Authors. Open Access, Article funded by SCOAP3 .
https://doi.org/10.1007/JHEP05(2020)081
JHEP05(2020)081
Searching for dark photon dark matter with cosmic ray antideuterons
Contents 1
2 Dark photon dark matter
3
3 Constraints from previous experiments
4
4 Coalescence and injection into the halo
5
5 Propagation through the galaxy and heliosphere
6
6 Detection prospects
9
7 Antihelium flux
14
8 Conclusions
17
1
Introduction
The search for dark matter (DM) is one of the defining challenges of contemporary particle physics, and although interesting anomalies have been seen throughout the multi-decade effort, no definitive evidence of a measurable particle interaction has yet been found. Though the current models in consideration cover a vast expanse of parameter space, the old idea of the Weakly Interacting Massive Particle (WIMP)-type thermal relic dark matter remains compelling, as a weak-scale O(pb) annihilation cross-section provides a natural origin for the present day dark matter abundance. However, direct detection experiments in particular are pushing constraints of DM-proton scattering to approaching ten orders of magnitude below that [1–5], and the scenario of simplistic weak-scale couplings to the visible sector is no longer viable. This is not to say that thermal relic dark matter scenario has been ruled out. Hidden sector dark matter, a class of models where DM annihilates to other dark sector particles, which in turn couple to the Standard Model (SM), is perhaps the most straightforward w
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