Forward pi^0 -Meson and Charged Particle Production in Deep Inelastic Scattering at low Bjorken-x

TL;DR

This paper reports measurements of high transverse momentum pi^0 mesons and charged particles in deep inelastic scattering at low Bjorken-x, providing new insights into QCD dynamics and evolution effects in the forward region.

Contribution

First measurement of single particles in the forward region at low Bjorken-x, testing QCD models and evolution effects in deep inelastic scattering.

Findings

Strong correlation between high-pt particles and hard parton emission

Extended measurements to small angles in the forward region

Comparison with QCD models shows sensitivity to evolution effects

Abstract

High transverse momentum pi^0 -mesons and charged particles are measured in deep inelastic e-p scattering events at low Bjorken-x taken with the H1 detector at HERA. The production of high-pt particles is strongly correlated to the emission of hard partons in QCD and is therefore sensitive to the dynamics of the strong interaction. For the first time the measurement of single particles has been extended to the region of small angles w.r.t. the proton remnant (forward region). This region is expected to be particularly sensitive to QCD evolution effects in final states. Results are presented as a function of Bjorken-x and x_i, the fraction of the incident proton's energy carried by the particle, and are compared to different QCD models.