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Ayuki Kamada
순수물리이론 연구단
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Self-interacting dark matter and muon (g-2) in a gauged U(1)(L mu) (- L tau) model

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Title
Self-interacting dark matter and muon (g-2) in a gauged U(1)(L mu) (- L tau) model
Author(s)
Ayuki Kamada; Kunio Kaneta; Keisuke Yanagi; Hai-Bo Yu
Publication Date
2018-06
Journal
JOURNAL OF HIGH ENERGY PHYSICS, v., no.6, pp.117 -
Publisher
SPRINGER
Abstract
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. c The Authors.
URI
https://pr.ibs.re.kr/handle/8788114/6192
ISSN
1029-8479
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
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