Chargino Production via Z0-Boson Decay in a Strong Electromagnetic Field

In the framework of MSSM the probability of Z(0)-boson decay to charginos in a strong electromagnetic field, Z(0) -> chi(+)chi(-), is analyzed. The method of calculations employs exact solutions of relativistic wave equations for charginos in a crossed electromagnetic field. Analytic expression for the decay width Gamma(Z(0) -> chi(+)chi(-)) is obtained at an arbitrary value of the parameter x = em(z)(-3)root-(F(mu nu)q(nu))(2) hich characterizes the external-field strength F-mu nu and Z(0)-boson momentum q(nu). The process Z(0) -> chi(+)chi(-) is forbidden in a vacuum for the case of relatively heavy charginos: M-chi +/- > mZ/2. However, in an intense electromagnetic background this reaction could take place in the region of superstrong fields (x > 1).