Precision calculation of processes used for luminosity measurement at the ZEUS experiment

Understand

The process pe -> pe+gamma with the photon emitted along the electron beam axis is used for luminosity measurement at HERA.

• In this paper the process is calculated including one-loop QED radiative corrections.
• In the ZEUS experiment, both the electron and the photon can be detected.
• Therefore both photon and electron spectra with and without the gamma-e coincidence are analyzed.