τ sleptons and τ sneutrino in the minimal supersymmetric standard model with complex parameters -: art. no. 115009

We present a phenomenological study of tau sleptons (tau) over tilde (1,2) and tau sneutrinos (nu) over tilde (tau) in the minimal supersymmetric standard model with complex parameters A(tau), mu and M-1. We analyze the production and decays of the (tau) over tilde (1,2) and (nu) over tilde (tau) at a future e(+)e(-) collider. We present numerical predictions for the important decay rates, paying particular attention to their dependence on the complex parameters. The branching ratios of the fermionic decays of (tau) over tilde (1) and (nu) over tilde (tau) show a significant phase dependence for tan betaless than or similar to10. For tan betagreater than or similar to10 the branching ratios for the (tau) over tilde (2) decays into Higgs bosons depend very sensitively on the phases. We show how information on the phase phi(Atau) and the other fundamental (tau) over tilde (i) parameters can be obtained from measurements of the (tau) over tilde (i) masses, polarized cross sections and bosonic and fermionic decay branching ratios, for small and large tan beta values. We estimate the expected errors of these parameters. Given favorable conditions, the error of A(tau) is about 10% to 20%, while the errors of the remaining stau parameters are in the range of approximately 1% to 3%. We also show that the induced electric dipole moment of the tau lepton is well below the current experimental limit.