Exploring New Physics Through Contact Interactions in Lepton Pair Production at a Linear Collider

If a contact interaction type correction to a Standard Model process is observed, studying its de-tailed properties can provide information on the fundamental physics responsible for it. Assuming that such a correction has been observed in lepton pair production at a 500 GeV − 1 TeV linear collider, we consider a few possible models that could explain it, such as theories with large and TeV-scale extra dimensions and models with lepton compositeness. We show that using the mea-sured cross-sections and angular distributions, thesemodels can be distinguishedwith a high degree of confidence. 1