%0 Journal Article
%T Testing freeze-in with axial and vector Z ' bosons
%A Cosme, C.
%A Dutra, M.
%A Godfrey, S.
%A Gray, T.
%J Journal of High Energy Physics
%D 2021
%V 09
%N 9
%I Springer
%@ 1029-8479
%G English
%F Cosme_etal2021
%O WOS:000695081900001
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4962), last updated on Wed, 22 Sep 2021 08:45:59 +0000
%X The freeze-in production of Feebly Interacting Massive Particle (FIMP) dark matter in the early universe is an appealing alternative to the well-known – and constrained – Weakly Interacting Massive Particle (WIMP) paradigm. Although challenging, the phenomenology of FIMP dark matter has been receiving growing attention and is possible in a few scenarios. In this work, we contribute to this endeavor by considering a Z ' portal to fermionic dark matter, with the Z ' having both vector and axial couplings and a mass ranging from MeV up to PeV. We evaluate the bounds on both freeze-in and freeze-out from direct detection, atomic parity violation, leptonic anomalous magnetic moments, neutrino-electron scattering, collider, and beam dump experiments. We show that FIMPs can already be tested by most of these experiments in a complementary way, whereas WIMPs are especially viable in the Z ' low mass regime, in addition to the Z ' resonance region. We also discuss the role of the axial couplings of Z ' in our results. We therefore hope to motivate specific realizations of this model in the context of FIMPs, as well as searches for these elusive dark matter candidates.
%K Beyond Standard Model
%K Cosmology of Theories beyond the SM
%R 10.1007/JHEP09(2021)056
%U https://arxiv.org/abs/2104.13937
%U https://doi.org/10.1007/JHEP09(2021)056
%P 056-27pp