3 papers
hep-ph2026
MadSpin2: automated spin-entangled decays of heavy resonances via the spin-density matrix formalism
Spyros Argyropoulos, Valentin Durupt, Olivier Mattelaer
The simulation of processes that contain multiple particles from the decay of unstable resonances becomes computationally challenging both at leading order and beyond. This paper p…
hep-ph2024
Novel collider signatures in the type-I 2HDM+ model
Spyros Argyropoulos, Ulrich Haisch, Ilia Kalaitzidou
The 2HDM+ model is one of the main models used in the interpretations of dark matter searches at the LHC. So far, all the 2HDM+ benchmarks considered by the ATLAS and CMS exp…
hep-ph2023
Density dependent displaced vertex signatures as a novel probe of light dark sector scalars at the LHC
Spyros Argyropoulos, Clare Burrage, Christoph Englert
Dynamical theories of dark energy predict new degrees of freedom with particular environmental sensitivity to avoid constraints on fifth forces. We show that the similar, yet compl…