Fakult at F Ur Physik Und Astronomie Inhaltsverzeichnis Einleitung 1 1 Die Physik Der Elektron-proton-streuung 3

The resolution of the energy measurement of electrons in the backward region of the H1 experiment at HERA is degraded by electrons initiating an electromagnetic cascade in dead material and thereby losing energy which is not detected in the backward calorimeter SpaCal. The feasibility of using the charge information of the backward driftchamber BDC to estimate the energy loss suuered by electrons in the dead material is investigated.The analysis is based on data taken in 1997 corresponding to a luminosity o f 1 5 p b ;1. F rom the correlation between the charge deposited in the driftchamber and the energy loss a correction function is derived. The impact of this energy correction function is studied in the full energy range by selecting two diierent processes with an electron in the nal state. The resolution of the electron energy measurement is improved over the full energy range by up to 12%. Since the simulation of the H1 detector response underestimates the dead material distribution , the application of the the energy correction improves the correspondence of electron energy spectra extracted from data and Monte-Carlo.