Measurement of the proton structure function FL (x, Q2) with the H1 detector at HERA [Elektronische Ressource] / von Sebastian Piec

Measurement of the Proton Structure FunctionFL(x,Q2) with the H1 Detector at HERADISSERTATIONzur Erlangung des akademischen GradesDr. Rer. Nat.im Fach Physikeingereicht an derMathematisch-Naturwissenschaftlichen Fakultät IHumboldt-Universität zu BerlinvonM.Sc. Sebastian Piecgeboren am 24.09.1981 in ZawierciePräsident der Humboldt-Universität zu Berlin:Prof. Dr. Christoph MarkschiesDekan der Mathematisch-Naturwissenschaftlichen Fakultät I:Prof. Dr. Lutz-Helmut SchönGutachter:1. Prof. Dr. Hermann Kolanoski2. Prof. Dr. Max Klein3. Dr. Alexander Glazoveingereicht am: Juli 2009Tag der mündlichen Prüfung: 6. November 2009AbstractA measurement of the inclusive cross section for the deep-inelastic scattering of2positrons on protons at low four-momentum transfer squared Q is presented. Themeasurement is used for the extraction of the longitudinal proton structure functionF . The analysis is based on data collected by the H1 experiment during special, lowLenergy runs in the year 2007. The direct technique of the F determination basedLon the extraction of the reduced DIS cross sections for three different centre-of-massenergies is used.For the purpose of the analysis a dedicated electron finder has been developed andintegrated with the standard H1 reconstruction software H1REC. The algorithmemploys information from two independent tracking detectors the Backward SiliconTracker and the Central Jet Chamber. The performance of the finder is studied.