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We evaluate two-body decay modes of neutralinos in the Minimal SupersymmetricStandard Model with complex parameters (cMSSM). Assuming heavy scalar quarks wetake into account all two-body decay channels involving charginos, neutralinos,(scalar) leptons, Higgs bosons and Standard Model gauge bosons. The evaluationof the decay widths is based on a full one-loop calculation including hard andsoft QED radiation. Of particular phenomenological interest are decaysinvolving the Lightest Supersymmetric Particle (LSP), i.e. the lightestneutralino, or a neutral or charged Higgs boson. For the chargino/neutralinosector we employ two different renormalization schemes, which differ in thetreatment of the complex phases. In the numerical analysis we concentrate onthe decay of the heaviest neutralino and show the results in the two differentschemes. The higher-order corrections of the heaviest neutralino decay widthsinvolving the LSP can easily reach a level of about 10-15%, while thecorrections to the decays to Higgs bosons are up to 20-30%, translating intocorrections of similar size in the respective branching ratios. The differencebetween the two schemes, indicating the size of unknown two-loop corrections,is less than order(0.1%). These corrections are important for the correctinterpretation of LSP and Higgs production at the LHC and at a future lineare+e- collider. The results will be implemented into the Fortran code FeynHiggs.

Neutralino Decays in the Complex MSSM at One-Loop: a Comparison of On-Shell Renormalization Schemes