Determination of the Integrated Luminosity at HERA using Elastic QED Compton Events

TL;DR

This paper reports a precise measurement of the integrated luminosity at HERA using elastic QED Compton events, achieving 2.3% accuracy and confirming previous Bethe-Heitler based results.

Contribution

It introduces a method to determine luminosity at HERA via elastic QED Compton scattering, providing an independent cross-check of existing measurements.

Findings

Luminosity measured with 2.3% precision.

Results agree with Bethe-Heitler process measurements.

Demonstrates the viability of elastic QED Compton events for luminosity determination.

Abstract

A measurement of the integrated luminosity at the ep collider HERA is presented, exploiting the elastic QED Compton process ep \rightarrow ep. The electron and the photon are detected in the backward calorimeter of the H1 experiment. The integrated luminosity of the data recorded in 2003 to 2007 is determined with a precision of 2.3%. The measurement is found to be compatible with the corresponding result obtained using the Bethe-Heitler process.