Speaker
Description
Despite its remarkable success, the Standard Model fails to explain phenomena such as neutrino masses, dark matter, and the matter–antimatter asymmetry, motivating a wide range of Beyond the Standard Model (BSM) scenarios. A major challenge in this context is the inverse problem, where different models produce overlapping signatures; hence, identifying the underlying BSM scenario becomes difficult.
In this talk, I address this issue by investigating how the spin of exotic charged particles, and the dark matter candidates, can be determined at future colliders. Focusing on models with a stable neutral particle ($C^0$) and charged partners ($C^\pm$) decaying via a $W^\pm$ boson, we study the process
$e^+e^- \to C^+C^- \to C^0C^0W^+W^-$, considering the Inert Doublet Model and the Minimal Supersymmetric Standard Model as representative examples of scalar and fermionic charged states, respectively. Using beam polarization at a future $e^+e^-$ collider, we demonstrate that the distributions of angular variables of the visible final-state particles provide an effective way to determine the spin of these exotic particles.
