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After presenting the recent measurements of neutral current cross section inDIS at HERA, we explain the effect of the $\gamma-Z_0$ interference at theelectro-weak scale, visible on these data. Then, the beam charge difference$x{F}_3$ is measured and the interference itself is extracted. Results arediscussed in the context of perturbative QCD.

New measurement of charge asymmetry $x{F}_3$ from HERA