Münster 2017 – wissenschaftliches Programm

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SYDI: Symposium Dissertationspreis der Fachverbände GR/T/HK

SYDI 1: GR-HK-T Dissertationspreis

SYDI 1.4: Hauptvortrag

Montag, 27. März 2017, 15:45–16:15, H 1

Test Beam Measurements for the Upgrade of the CMS Pixel Detector & Measurement of the Top Quark Mass from Differential Cross Sections — •Simon Spannagel — CERN, Geneva, Switzerland

In this dissertation, two different topics are addressed which are vital for the realization of modern high-energy physics experiments: detector development and data analysis. The first part focuses on the development and characterization of silicon pixel detectors. To account for the expected increase in luminosity of the LHC, the pixel detector of the CMS experiment is replaced by an upgraded detector with new front-end electronics. Comprehensive test beam studies are presented which have been conducted to verify the design and to quantify the performance of the new front-end in terms of tracking efficiency and spatial resolution. Furthermore, a new cluster interpolation method is proposed which utilizes the third central moment of the cluster charge distribution to improve the position resolution. In the second part of the thesis, an alternative measurement of the top quark mass is presented. The mass is measured from the normalized differential production cross sections of dileptonic top quark pair events with an additional jet. The measurement is performed with the full data set recorded by the CMS experiment at a center-of-mass energy of 8 TeV. Using theoretical predictions at next-to-leading order precision in perturbative QCD, the top quark pole mass is determined with a template fit method.