2014, XIX, 167 p. 127 illus., 115 illus. in color.
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Nominated as an outstanding Ph.D. thesis by the University of Oxford, UK
First observation of CP violation in charged B decays
Presents the results of an original high-energy physics analysis
CP violation is a well-established phenomenon in particle physics, but until 2001 it was only observed in kaons. In the last decade, several matter-antimatter asymmetries have been observed in neutral B mesons in line with the expectations of the Standard Model of the weak interaction. Direct CP violation is also expected in the decay rates of charged B+ mesons versus that of B- mesons, though the greatest effects are present in a decay that occurs just twice in 10 million decays. Such rarity requires huge samples to study and this is exactly what the LHC, and its dedicated B-physics experiment LHCb provide. This thesis presents an analysis of the first two years of LHCb data. The author describes the first observation of the rare decay, B- → DK-, D → π-K+ and the first observation of direct CP violation in this B decay. The work consitutes essential information on the experiment’s measurement of a fundamental parameter of the theory and stands as a benchmark against which subsequent analyses of this type will be compared.
Content Level »Research
Keywords »CKM Matrix - Flavour Physics - LHCb Experiment - Matter-antimatter Asymmetry in B Mesons - Rare B Meson Decays - Standard Model of the Weak Interaction - Tests of CP Violation