Self-interacting dark matter and muon (g - 2) in a gauged model
- Inst. for Basic Science (IBS), Daejeon (Korea, Republic of). Center for Theoretical Physics of the Universe
- Inst. for Basic Science (IBS), Daejeon (Korea, Republic of). Center for Theoretical Physics of the Universe; Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy. William I. Fine Theoretical Physics Inst.
- Univ. of Tokyo (Japan). Dept. of Physics
- Univ. of California, Riverside, CA (United States). Dept. of Physics and Astronomy
We construct a self-interacting dark matter model that could simultaneously explain the observed muon anomalous magnetic moment. It is based on a gauged 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 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 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.
- Research Organization:
- Univ. of California, Riverside, CA (United States); Univ. of Minnesota, Minneapolis, MN (United States); Inst. for Basic Science (IBS), Daejeon (Korea, Republic of); Univ. of Tokyo (Japan)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); Inst. for Basic Science (IBS) (Korea, Republic of); Japan Society for the Promotion of Science (JSPS)
- Grant/Contract Number:
- SC0008541; SC0011842; PHY-1748958; IBS-R018-D; JP18J10202
- OSTI ID:
- 1505139
- Journal Information:
- Journal of High Energy Physics (Online), Vol. 2018, Issue 6; ISSN 1029-8479
- Publisher:
- Springer BerlinCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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