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

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

May 2, 2018

19 pages

Published in:

JHEP 06 (2018) 117

Published: Jun 21, 2018

e-Print:

1805.00651 [hep-ph]

DOI:

10.1007/JHEP06(2018)117

Report number:

CTPU-PTC-18-10,
UMN-TH-3716/18,
FTPI-MINN-18/07,
UT-18-10,
UMN-TH-3716-18,
FTPI-MINN-18-07

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Abstract: (Springer)

We construct a self-interacting dark matter model that could simultaneously explain the observed muon anomalous magnetic moment. It is based on a gauged

\mathrm{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

\mathrm{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

\mathrm{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.

Note:

19 pages, 7 figures; the published version

Beyond Standard Model
Cosmology of Theories beyond the SM
new physics
muon tau: symmetry
symmetry: U(1)
muon: magnetic moment
fermion: new particle
fermion: dark matter
fermion: vector particle
galaxy: cluster

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