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| Home > Publications database > Test Beam Measurements for the Upgrade of the CMS Pixel Detector and Measurement of the Top Quark Mass from Differential Cross Sections |
| Book/Report/Dissertation / PhD Thesis | PUBDB-2016-01794 |
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2016
Verlag Deutsches Elektronen-Synchrotron
Hamburg
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Please use a persistent id in citations: doi:10.3204/DESY-THESIS-2016-010
Report No.: DESY-THESIS-2016-010
Abstract: 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 Large Hadron Collider, the pixel detector of the Compact Muon Solenoid (CMS) experiment will be 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. The tracking efficiency has been determined to be 99.7 +0.3 -0.5%, while the spatial resolution has been measured to be (4.80 +-0.29) um and (7.99 +-0.23) um along the 100 um and 150 um pixel pitch, respectively. Furthermore, a new cluster interpolation method is proposed which utilizes the third central moment of the cluster charge distribution and achieves improvements of the position resolution of up to 40% over the conventional center of gravity algorithm. 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 on data recorded by the CMS experiment at $sqrt(s) = 8$ TeV, corresponding to an integrated luminosity of 19.7 /fb. Using theoretical predictions at next-to-leading in perturbative QCD, the top quark pole mass is measured to be mt(pole) = 168.2 +4.7 -2.1 GeV with a precision of about 2.0%. The measurement is in agreement with other measurements of the top quark pole mass within the assigned uncertainties.
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