Indirect dark-matter detection with MadDM v3.2 – Lines and Loops
Chiara Arina, Jan Heisig, Fabio Maltoni, Daniele Massaro, Olivier Mattelaer
Abstract
Abstract Automated tools for the computation of particle physics’ processes have become the backbone of phenomenological studies beyond the standard model. Here, we present MadDM v3.2. This release enables the fully automated computation of loop-induced dark-matter annihilation processes, relevant for indirect detection observables. Special emphasis lies on the annihilation into $$\gamma X$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>γ</mml:mi> <mml:mi>X</mml:mi> </mml:mrow> </mml:math> , where $$X=\gamma , Z, h$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>X</mml:mi> <mml:mo>=</mml:mo> <mml:mi>γ</mml:mi> <mml:mo>,</mml:mo> <mml:mi>Z</mml:mi> <mml:mo>,</mml:mo> <mml:mi>h</mml:mi> </mml:mrow> </mml:math> or any new particle even under the dark symmetry. These processes lead to the sharp spectral feature of monochromatic gamma lines – a smoking-gun signature of dark matter in our Galaxy. MadDM provides the predictions for the respective fluxes near-Earth and derives constraints from the gamma-ray line searches by Fermi-LAT and HESS. As an application, we discuss the implications for the viable parameter space of a top-philic t -channel mediator model and the inert doublet model.