CP-violating asymmetry in chargino decay into neutralino and W boson

Abstract

In the MSSM with complex parameters, loop corrections to $\cha_i^\pm \to \neu_j^0 W^\pm$ lead to a CP violating asymmetry $\ACP = (Γ(\cha_i^+ \to \neu_j^0 W^+) - Γ(\cha_i^- \to \neu_j^0 W^-))/ (Γ(\cha_i^+ \to \neu_j^0 W^+) + Γ(\cha_i^- \to \neu_j^0 W^-))$. We calculate this asymmetry at full one-loop level. We perform a detailed numerical analysis for $\cha_1^\pm \to \neu_1^0 W^\pm$ and $\cha_2^\pm \to \neu_1^0 W^\pm$ analyzing the dependence on the parameters and phases involved. Asymmetries of several percent are obtained. We also discuss the feasability of measuring these asymmtries at LHC.

14 pages, 6 figures, version to be published in PLB

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• Chargino Decays in the Complex MSSM: A Full One-Loop Analysis
• CP asymmetries in scalar bottom quark decays
• CP asymmetries in chargino production and decay: the three-body decay case
• CP violation in sbottom decays
• One-loop effects on MSSM parameter determination via chargino production at the LC
• CP observables with spin-spin correlations in chargino production
• CP violation in SUSY
• Normal tau polarisation as a sensitive probe of CP violation in chargino decay
• Testing the CP-violating MSSM in stau decays at the LHC and ILC
• SUSY CP phases and asymmetries at colliders
• CP Violation in Three-Body Chargino Decays
• CP Violating Asymmetry in Stop Decay into Bottom and Chargino
• The loop effects on the chargino decays ${\tilde{\chi }}_1^{\pm }\to {\tilde{\chi }}_1^{0}f{f}^{\prime }$ in the MSSM