Measurement of the Υ(4S) → B⁰ anti-B⁰ branching fraction at the Belle experiment

Schmolz, Pascal (2024): Measurement of the Υ(4S) → B⁰ anti-B⁰ branching fraction at the Belle experiment = Messung des Verzweigungsverhältnisses (4S) → B⁰ anti-B⁰ am Belle Experiment. Dissertation, LMU München: Fakultät für Physik

Abstract

B factories are electron-positron accelerators whose purpose is to generate the highest possible number of B mesons. The centre-of-mass energy of the collision is set to produce a Υ(4S) resonance with the highest probability. The short-lived state consisting of a bottom and an antibottom quark subsequently decays predominantly into a pair of B mesons. The available energy and the conservation of charge result in a decay to either a pair of uncharged or charged B mesons. The rate at which either a charged or uncharged pair is created is of decisive importance for a variety of precision measurements. From an experimental point of view, it is often more advantageous to determine physical quantities in ratios instead of determining them directly. This dissertation, by contrast, addresses the direct measurement of the branching fraction of the decay Υ(4S) → B⁰ anti-B⁰. For this purpose, a data set recorded at the Belle experiment with an integrated luminosity of 571 inverse femtobarn is analysed.

• Dokumententyp: Dissertationen (Dissertation, LMU München)
• Keywords: high energy physics, flavor physics, belle experiment, branching fraction, isospin symmetry
• Themengebiete: 500 Naturwissenschaften und Mathematik ; 500 Naturwissenschaften und Mathematik > 530 Physik
• Fakultäten: Fakultät für Physik
• Sprache der Hochschulschrift: Englisch
• Datum der mündlichen Prüfung: 26. Juli 2024
• 1. Bericht­erstatter:in: Kuhr, Thomas