2016/05/20 by Daniel W. Kolodrubetz, Kolodrubetz, Daniel W.
Medicine · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Medical Imaging Techniques and Applications #Particle Detector Development and Performance #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.48550/arxiv.1605.06435
Ph.D. thesis, MIT, May 2016, 167 pages, 42 figures
arxiv created 2016/05/20 · openalex publication_date 2016/05/20 · arxiv updated 2016/05/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this thesis, we discuss and investigate the use of Soft-Collinear Effective Theory (SCET) for high precision calculations. In the first part of the work, we present an extraction of the strong coupling, αs(mZ) and the leading nonperturbative parameter Ω1, using the event shape C-parameter. By comparing lepton collider data to the C-parameter cross section, we extract values αs(mZ)=0.1123± 0.0015 and Ω1=0.421± 0.063 \rm GeV with χ2/\rmdof=0.988 for 404 bins of data. The later parts of this thesis are dedicated to using on-shell helicity methods to extend SCET beyond leading power. We present a complete set of scalar helicity building blocks and describe an interesting angular momentum selection rule that restricts how these building blocks can be assembled.