New test on contact interactions in the data at $\sqrt{s}$ 130-207GeV by Bhabha scattering process $e^{+}{e}^{-}\to e^{+}{e}^{-}$

Abstract

We used data mainly collected by OPAL experiment to test the signal significance of a parameter $\epsilon$, which is equal to zero in SM. For total cross sections, we obtained no derivation of enough significance. But for differential cross sections, some derivation over 3$\sigma$ are observed(statistical uncertainty only), indicating that this contact interaction might exist.