CP Violation in Three-Body Chargino Decays

Understand

CP violation in supersymmetry can give rise to rate asymmetries in the decays of supersymmetric particles.

• In this work we compute the rate asymmetries for the three-body chargino decays \tilde\chi^\pm_2 \to \tilde\chi^\pm_1 HH, \tilde\chi^\pm_2 \to \tilde\chi^\pm_1 ZZ, \tilde\chi^\pm_2 \to \tilde\chi^\pm_1 W^+ W^- and \tilde\chi^\pm_2 \to tilde\chi^\pm_1 ZH.
• Each of the decays contains contributions mediated by neutral Higgs bosons that can possibly go on shell.
• Such contributions receive a resonant enhancement; furthermore, the strong phases required for the CP asymmetries come from the widths of the exchanged Higgs bosons.