Neutralinos from Chargino Decays in the Complex MSSM

We review the evaluation of two-body decay modes of charginos in the MinimalSupersymmetric Standard Model with complex parameters (cMSSM). Assuming heavyscalar quarks we take into account all decay channels involving charginos,neutralinos, (scalar) leptons, Higgs bosons and SM gauge bosons. The evaluationof the decay widths is based on a full one-loop calculation including hard andsoft QED radiation. Here we focus on the decays involving the LightestSupersymmetric Particle (LSP), i.e. the lightest neutralino, or a heavierneutralino and a W boson. The higher-order corrections of the chargino decaywidths can easily reach a level of ±10%, translating into corrections of similarsize in the respective branching ratios. These corrections are important for thecorrect interpretation of LSP and heavier neutralino production at the LHC andat a future linear e + e − collider.

Note:

6 pages, 2 figures, talk given at the LCWS 2011, September 2011, Granada, Spain

chargino: decay
decay: width
neutralino: production
chargino: decay modes
squark: heavy
minimal supersymmetric standard model

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