Date of Award


Document Type

Open Access Dissertation


Physics and Astronomy

First Advisor

Milind Purohit


The Belle detector is a particle physics detector that is located around the collision point of the asymmetric-energy e+e- collider KEKB. Both detector and collider are located at the KEK international lab in Japan. This thesis uses the full Belle data sample of 772 × 106 BB¯ pairs collected at the Υ(4S) resonance. Decays with large b → s penguin transitions in the standard model (SM), such as B± → φKS0π±, could be a source of CP violation. This is important in the race to find the mechanism behind the universe’s matter-antimatter imbalance. b → s penguin transitions allow us to search for new particles to appear in virtual loops because they are reliably calculable in the SM thereby providing an opportunity to observe new physics resulting in direct CP violation. In this thesis we study the branching fractions and CP asymmetries in B± → φKS0π±. Many experiments (such as Belle, CLEO or LHCb) have not made a branching fraction measurement in this decay mode. Other associated modes that need further study are B± → φK∗±(892), and B± → φK2∗±(1430). The fraction of longitudinal polarization of the K∗ mesons, fL, needs to be further studied by Belle and other experiments for B± → φKS0π± as there is other interest in these measurements.

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