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Self-interacting dark matter and muon $g-2$ in a gauged U$(1)_{L_{\mu} - L_{\tau}}$ model

25 Jul 2018, 15:50
21m
Room C

Room C

Speaker

Keisuke Yanagi (University of Tokyo)

Description

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 pair of vector-like fermions as the dark matter candidate and a new Higgs boson to break the symmetry at the 10 MeV scale. The new gauge boson has 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 thermal evolution of the model in the early Universe and derive a lower bound on the gauge boson mass.

Parallel Session Dark Matter, Astroparticle Physics

Primary author

Keisuke Yanagi (University of Tokyo)

Co-authors

Ayuki Kamada (IBS-CTPU) Hai-Bo Yu (University of California, Riverside) Kunio Kaneta

Presentation materials