Abstract
We point out that oscillation between the two scalar tau ( τ ̃ ) mass eigenstates can give rise to CP-violation if some parameters appearing in the stau or chargino/neutralino mass matrices are complex. If τ ̃ + and τ ̃ − decay into different charginos or neutralinos, rate asymmetries as large as 20% are possible. If both staus decay directly into τ+LSP, CP-violation can in principle still be observed through an energy asymmetry of the τ decay products, but this asymmetry never exceeds the percent level. Even the rate asymmetries become small if the mass splitting between the two stau mass eigenstates is larger than 1%.
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