Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 6, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP06(2018)117
Keywords
Beyond Standard Model; Cosmology of Theories beyond the SM
Categories
Funding
- IBS [IBS-R018-D]
- DOE [DE-SC0011842]
- U.S. Department of Energy [DE-SC0008541]
- U.S. National Science Foundation, KITP High Energy Physics at the Sensitivity Frontier workshop [NSF PHY-1748958]
- JSPS KAKENHI grant [JP18J10202]
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We construct a self-interacting dark matter model that could simultaneously explain the observed muon anomalous magnetic moment. It is based on a gauged U(1)(L mu-L tau) extension of the standard model, where we introduce a vector-like pair of fermions as the dark matter candidate and a new Higgs boson to break the symmetry. The new gauge boson has a sizable contribution to muon (g - 2), while being consistent with other experimental constraints. The U(1)(L mu-L tau) Higgs boson acts as a light force carrier, mediating dark matter self-interactions with a velocity-dependent cross section. It is large enough in galaxies to thermalize the inner halo and explain the diverse rotation curves and diminishes towards galaxy clusters. Since the light mediator dominantly decays to the U(1)(L mu-L tau) gauge boson and neutrinos, the astrophysical and cosmological constraints are weak. We study the thermal evolution of the model in the early Universe and derive a lower bound on the gauge boson mass.
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