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First Measurement of the Hadronic Final State Charge Asymmetry in High Q 2 Deep-Inelastic Scattering at HERA

A ﬁrst measurement has been made of the charge asymmetry in the scattered hadronic ﬁnal state from the hard interaction in high Q 2 (100 < Q 2 < 8 , 000 GeV 2 ) deep-inelastic ep neutral current scattering at HERA. The diﬀerence between the event normalised distribution of the scaled momentum, x p , for positively and negatively charged particles, measured in the current region of the Breit frame, has been studied together with its evolution as a function of Q . The results are compared to Monte Carlo models at the hadron and parton level.