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This thesis addresses two different topics, both vital for
implementing modern high-energy physics experiments: detector
development and data analysis. Providing a concise introduction to
both the standard model of particle physics and the basic
principles of semiconductor tracking detectors, it presents the
first measurement of the top quark pole mass from the differential
cross-section of tt+J events in the dileptonic tt decay channel.
The first part focuses on the development and characterization of
silicon pixel detectors. To account for the expected increase in
luminosity of the Large Hadron Collider (LHC), the pixel detector
of the compact muon solenoid (CMS) experiment is replaced by an
upgraded detector with new front-end electronics. It presents
comprehensive test beam studies conducted to verify the design and
quantify the performance of the new front-end in terms of tracking
efficiency and spatial resolution. Furthermore, it proposes a new
cluster interpolation method, which utilizes the third central
moment of the cluster charge distribution to improve the position
resolution. The second part of the thesis introduces an alternative
measurement of the top quark mass from the normalized differential
production cross-sections of dileptonic top quark pair events with
an additional jet. The energy measurement is 8TeV. Using
theoretical predictions at next-to-leading order in perturbative
Quantum Chromodynamics (QCD), the top quark pole mass is determined
using a template fit method.
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