2 papers
hep-ph2021
Exact accidental U(1) symmetries for the axion
Luc Darmé, Enrico Nardi
We study a class of gauge groups that can automatically yield a perturbatively exact Peccei-Quinn symmetry, and we outline a model in which the axion quality problem is solved at a…
hep-ph2020
New production channels for light dark matter in hadronic showers
Andrea Celentano, Luc Darmé, Luca Marsicano +1
Hadronic showers transfer a relevant amount of their energy to electromagnetic subshowers. We show that the generation of "secondary" dark photons in these sub-showers is significa…