In this thesis we will first introduce deep inelastic positron proton
scattering and in particular charged current scattering from a
theoretical point of view. We will also show some of the
results obtained by other experiments and show the potential of
the HERA machine for this kind of physics. We will then
describe the HERA machine and the ZEUS detector
in detail with emphasis on the components that were used for
the analysis of the data presented in this thesis.
The data are positron-proton scattering events as
measured in 
.
We will then introduce the Monte Carlo simulation used
for the analysis.
Charged current event analysis consists of two steps, first
the events need to be selected and then they can be analyzed.
Because of the low cross section of the CC interaction
the selection of events is a difficult task and the selection
procedure used in this analysis is described in detail in
two chapters. The analysis of the results and comparison
to the expectation is then performed in the next chapter.
The thesis ends with a summary. The three appendices describe
work related to the ZEUS UCAL data acquisition and
second level trigger system as well as the ZEUS global
second level trigger system that was performed by the
author while at DESY in Hamburg from 
to .