Constraints on Electron-quark Contact Interactions

Abstract

In this talk, I summarize a global analysis on electron-quark contact interactions using the updated NC DIS data at HERA, Drell-yan production at the Tevatron, total hadronic cross sections at LEP, atomic parity violation measurement, low energy $e$-nucleon scattering data, and the $\nu$-nucleon scattering data. The global data do not show any evidence for contact interactions. Thus, we obtain limits of 8--15 TeV on the compositeness scale, which are significantly better than those published by each individual experiment.