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

TL;DR

This paper reports the first measurement of charge asymmetry in the hadronic final state in high Q^2 deep-inelastic ep scattering at HERA, providing insights into the parton-level dynamics and hadronization processes.

Contribution

It presents the first measurement of charge asymmetry in the hadronic final state in deep-inelastic scattering at HERA, comparing results to Monte Carlo models at different levels.

Findings

Charge asymmetry observed in the scaled momentum distributions.

Evolution of charge asymmetry with Q^2 analyzed.

Results compared with Monte Carlo predictions.

Abstract

A first measurement is presented of the charge asymmetry in the hadronic final state from the hard interaction in deep-inelastic ep neutral current scattering at HERA. The measurement is performed in the range of negative squared four momentum transfer 100<Q^2<8,000 GeV^2. The difference between the event normalised distributions of the scaled momentum, x_p, for positively and negatively charged particles, measured in the current region of the Breit frame, is studied together with its evolution as a function of Q. The results are compared to Monte Carlo models at the hadron and parton level.