Numerous non-standard dynamics are described by contact-like effective interactions that can manifest themselves in e+e- collisions only through deviations of the observables (cross sections, asymme­tries) from the Standard Model predictions. If such a deviation were observed, it would be important to identify the actual source among the possible non-standard interactions as many different new
physics scenarios may lead to very similar experimental signatures. Here we study the possibility of uniquely identifying the indirect effects of s-channel sneutrino exchange, as predicted by supersymmetric theories with R-parity violation, against other new physics scenarios in process e+e- — µ+µ- at the International Linear Col­lider. To evaluate the identification reach on sneutrino exchange, we use as basic observable a double polarization asymmetry, A doubie-Also, we examine the effects of neutrino and electron mixing with exotic heavy leptons in the process e+e- — W+W- within E6 models, in particular, the possibility of uniquely distinguishing and identifying such effects ofheavy neutral lepton exchange from Z —Z’ mixing.