Augury of Darkness: The Low-Mass Dark Z' Portal
Alexandre Alves, Giorgio Arcadi, Yann Mambrini, Stefano Profumo,, Farinaldo S. Queiroz

TL;DR
This paper explores low-mass Z' portal models for Dirac and Majorana dark matter, analyzing collider, direct, and indirect detection constraints, and their potential to explain the Galactic center gamma-ray excess.
Contribution
It provides a comprehensive analysis of light Z' mediators in dark matter models, including collider bounds, scattering limits, and implications for gamma-ray excess.
Findings
Light Z' models are still constrained by current data.
Near-resonance scenarios can explain the Galactic center gamma-ray excess.
Constraints from collider and detection experiments significantly restrict low-mass Z' parameter space.
Abstract
Dirac fermion dark matter models with heavy mediators are subject to stringent constraints from spin-independent direct searches and from LHC bounds, cornering them to live near the resonance. Such constraints can be relaxed, however, by turning off the vector coupling to Standard Model fermions, thus weakening direct detection bounds, or by resorting to light masses, below the Z pole, to escape heavy resonance searches at the LHC. In this work we investigate both cases, as well as the applicability of our findings to Majorana dark matter. We derive collider bounds for light gauge bosons using the method, spin-dependent scattering limits, as well as the spin-independent scattering rate arising from the evolution of couplings between the energy scale of the mediator mass and the nuclear energy scale, and indirect detection…
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