Tau polarizations in the three-body slepton decays with stau as the next lightest supersymmetric particle - art. no. 075008

In the gauge-mediated supersymmetry breaking models with a scalar tau as th e next-to-lightest supersymmetric particle, a scalar lepton may decay domin antly into its superpartner, the tau lepton, and the lightest scalar tau pa rticle through (l) over tilde -->l tau (+/-)(t) over tilde (+/-)(1). We giv e detailed formulas for the three-body decay amplitudes and the polarizatio n asymmetry of the outgoing tau lepton. We find that the tau polarizations are sensitive to the model parameters such as the stau mixing angle, the ne utralino to slepton mass ratio, and the neutralino mixing effect.