Coscattering in the extended singlet-scalar Higgs portal
Bastián Díaz Sáez, Jayita Lahiri, Kilian Möhling
Abstract
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 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.
Topics & Concepts
PhysicsHiggs bosonParticle physicsSinglet stateScalar (mathematics)Quantum electrodynamicsTheoretical physicsNuclear physicsMathematicsExcited stateGeometryDark Matter and Cosmic PhenomenaParticle physics theoretical and experimental studiesAstrophysics and Cosmic Phenomena