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Antunovic, Biljana (2007): A First Measurement of the Charged Current DIS Cross Sections with Longitudinally Polarised Electrons in the H1 Experiment at HERA. Dissertation, LMU München: Faculty of Physics



The analysis presented in this thesis is based on data from electron-proton collisions with longitudinally polarised electron beams at a centre-of-mass energy of ${\sqrt s}=319~$GeV. The data were taken with the H1 detector at the HERA collider in the year 2005 corresponding to two polarisation states: a left-handed electron polarisation of $-27\%$ and a right-handed electron polarisation of $+37\%$, corresponding to integrated luminosities of $68.6~\rm pb^{-1}$ and $29.6~\rm pb^{-1}$, respectively. The inclusive total deep inelastic charged current cross section and the differential cross sections are measured for both helicities in the kinematic domain $Q^{2}>400~\rm GeV^{2}$ and $y<0.9$. The entire analysis chain necessary for the determination of the cross sections is described with emphasis on the understanding of the performance of the Liquid Argon trigger system. The experimental results obtained are consistent with the predictions of the Standard Model. In particular, the measurement of the total polarised charged current cross section confirms the Standard Model expectation that there are no weak charged current interactions mediated by a hypothetical right-handed $W$ boson. In addition, a measurement of the charged current structure function $F_{2}^{cc}$ has been performed at the H1 experiment for the first time. The measurements are well described by the theoretical expectations based on parton distributions derived from inclusive neutral current measurements in H1, and are in agreement with published data from the ZEUS ($e^{\pm}p$) and CCFR ($\overset{(-)}{\nu_{\mu}}Fe$) experiments.