Abstract
From the viewpoint of a Calabi-Yau superstring E6 model, we study low-energy effective theory with an extra U(l) gauge symmetry within the framework of a four generation model. Main emphasis is placed on chargino and neutralino mass spectra. When a fourth sneutrino evolves a non-zero VEV, various interesting phenomena are expected. Such an R-parity violating scenario together with the present experimental data leads to the result that masses of the lightest chargino and neutralino are 45~80 GeV and 20~90 GeV, respectively. A possible generation mixing among leptons is also predicted.
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