A systematic study of hidden sector dark matter: application to the gamma-ray and antiproton excesses
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Springer
Received: January Revised: June Accepted: June Published: July
29, 10, 12, 23,
2020 2020 2020 2020
A systematic study of hidden sector dark matter: application to the gamma-ray and antiproton excesses
a
Fermilab, Fermi National Accelerator Laboratory, Batavia, IL 60510, U.S.A. University of Chicago, Kavli Institute for Cosmological Physics, Chicago, IL 60637, U.S.A. c University of Chicago, Department of Astronomy and Astrophysics, Chicago, IL 60637, U.S.A. d Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, U.S.A. e University of Chicago, Department of Physics, Chicago, IL 60637, U.S.A. f Instituto de Fisica Corpuscular (IFIC), CSIC-Universitat de Valencia, Valencia, Spain b
E-mail: [email protected], [email protected], [email protected], [email protected], [email protected] Abstract: In hidden sector models, dark matter does not directly couple to the particle content of the Standard Model, strongly suppressing rates at direct detection experiments, while still allowing for large signals from annihilation. In this paper, we conduct an extensive study of hidden sector dark matter, covering a wide range of dark matter spins, mediator spins, interaction diagrams, and annihilation final states, in each case determining whether the annihilations are s-wave (thus enabling efficient annihilation in the universe today). We then go on to consider a variety of portal interactions that allow the hidden sector annihilation products to decay into the Standard Model. We broadly classify constraints from relic density requirements and dwarf spheroidal galaxy observations. In the scenario that the hidden sector was in equilibrium with the Standard Model in the early universe, we place a lower bound on the portal coupling, as well as on the dark matter’s elastic scattering cross section with nuclei. We apply our hidden sector results to the observed Galactic Center gamma-ray excess and the cosmic-ray antiproton excess. We find that both of these excesses can be simultaneously explained by a variety of hidden sector models, without any tension with constraints from observations of dwarf spheroidal galaxies. Keywords: Beyond Standard Model, Cosmology of Theories beyond the SM ArXiv ePrint: 1912.08821 1
ORCID: ORCID: 3 ORCID: 4 ORCID: 5 ORCID: 2
0000-0001-8837-4127. 0000-0002-1287-8780. 0000-0002-5763-5758. 0000-0002-4378-842X. 0000-0003-4649-3085.
c The Authors. Open Access, Article funded by SCOAP3 .
https://doi.org/10.1007/JHEP07(2020)163
JHEP07(2020)163
Dan Hooper,a,b,c,1 Rebecca K. Leane,d,2 Yu-Dai Tsai,a,3 Shalma Wegsmane,4 and Samuel J. Wittef,5
Contents 1
2 Hidden sector dark matter annihilation
3
3 Portals between the hidden sector and the standard model 3.1 Hypercharge portal 3.2 B − L portal 3.3 Baryon portal 3.4 Li − Lj portal 3.5 Higgs portal 3.6 Two-Higgs doublet portal 3.7 Neutrino portal
5 7 7 8 8 9 9 9
4 Characteristics of the gamma-ray and antiproton excesses 4.1 The galactic center gamma-ray excess 4.2 The cosmic-ray antiproton excess
10 12 14
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