Jets and Energy Flow in Photon-Proton Collisions at HERA

Abstract

Properties of the hadronic final state in photoproduction events with large transverse energy are studied at the electron-proton collider HERA. Distributions of the transverse energy, jets and underlying event energy are compared to $\overline{p}p$ data and QCD calculations. The comparisons show that the $\gamma p$ events can be consistently described by QCD models including -- in addition to the primary hard scattering process -- interactions between the two beam remnants. The differential jet cross sections $d\sigma /d{E}_T^{jet}$ and $d\sigma /d{\eta }^{jet}$ are measured.

27 pages, latex, 7 figures appended as uuencoded file