The purpose of this thesis is the study of rare decays with the BABAR detector. In the first part we present the study of the leptonic decays B0 → e +e-, B0 → μ +μ- and B0 → e±μ∓, based on a dataset corresponding to (383.6 ± 4.2) × 106 BB¯ pairs. We do not find evidence of any of the three decay modes, and obtain upper limit on the branching fractions, at 90% confidence level, of [special characters omitted](B0 → e +e-) < 11.3 × 10-8 , [special characters omitted](B0 → μ+μ -) < 5.2 × 10-8, and [special characters omitted](B0 → e ±μ∓) < 9.2 × 10-8. In the second part we present the measurement of CP asymmetry in rare inclusive B → Xsγ decays on the recoil of fully-reconstructed hadronic B decays, using a dataset corresponding to (465.0 ± 5.1) × 106 BB¯ pairs. We measure a value of ACP = -0.12 ± 0.11 ± 0.03.
| Identifer | oai:union.ndltd.org:UMASS/oai:scholarworks.umass.edu:dissertations-5644 |
| Date | 01 January 2010 |
| Creators | Salvati, Emmanuele |
| Publisher | ScholarWorks@UMass Amherst |
| Source Sets | University of Massachusetts, Amherst |
| Language | English |
| Detected Language | English |
| Type | text |
| Source | Doctoral Dissertations Available from Proquest |
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