In a U(1)B-L model with four chiral fermions, conversion-driven freeze-out lets a long-lived heavier fermion set the dark matter relic density while direct detection stays weak.
Coscattering in the Extended Singlet-Scalar Higgs Portal
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abstract
We study the coscattering mechanism in a simple Higgs portal which add two real singlet scalars to the Standard Model. In this scenario, the lighter scalar is stabilized by a single $\mathcal{Z}_2$ symmetry and acts as the dark matter relic, whose freeze-out is driven by conversion processes. The heavier scalar becomes an unstable state which participate actively in the coscattering. We find viable parameter regions fulfilling the measured relic abundance, while evading direct detection and big-bang nucleosynthesis bounds. In addition, we discuss collider prospects for the heavier scalar as a long-lived particle at present and future detectors.
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Evading Dark Matter Bounds through NLSP-Assisted Freeze-Out with Long-Lived Signatures
In a U(1)B-L model with four chiral fermions, conversion-driven freeze-out lets a long-lived heavier fermion set the dark matter relic density while direct detection stays weak.