Freezing in vector dark matter through magnetic dipole interactions - INSPIRE

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Freezing in vector dark matter through magnetic dipole interactions

Gordan Krnjaic
(
)
,
Duncan Rocha
(
- Chicago U.
)
,
Anastasia Sokolenko
(
- Fermilab and
- Chicago U., KICP
)

Oct 12, 2022

11 pages

Published in:

Phys.Rev.D 108 (2023) 3, 035047

Published: Aug 1, 2023

e-Print:

2210.06487 [hep-ph]

DOI:

10.1103/PhysRevD.108.035047 (publication)

Report number:

FERMILAB-PUB-22-670-T

View in:

reference search7 citations

Citations per year

Abstract: (APS)

We study a simple model of vector dark matter that couples to Standard Model particles via magnetic dipole interactions. In this scenario, the cosmological abundance arises through the freeze-in mechanism and depends on the dipole coupling, the vector mass, and the reheat temperature. To ensure cosmological metastability, the vector must be lighter than the fermions to which it couples, but rare decays can still produce observable

3 γ

final states; two-body decays can also occur at one loop with additional weak suppression, but are subdominant if the vector couples mainly to light fermions. For sufficiently heavy vectors, induced kinetic mixing with the photon can also yield additional two-body decays to lighter fermions and predict indirect detection signals through final-state radiation. We explore the implications of couplings to various flavors of visible particles and emphasize leptophilic dipoles involving electrons, muons, and taus, which offer the most promising indirect detection signatures through

3 γ

,

e^{+} e^{-} γ

, and

μ^{+} μ^{-} γ

decay channels. We also present constraints from current and past telescopes, and sensitivity projections for future missions including e-ASTROGAM and AMEGO.

dipole: magnetic
dipole: interaction
dark matter: vector
mixing: kinetic
mass: vector
radiation: final-state interaction
dipole: coupling
model: vector
dark matter: relic density
temperature

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