Measurements of CP-violating Asymmetries and Polarization in b->s Transitions at Belle
| Autor: | Kai-Feng Chen, 陳凱風 |
|---|---|
| Rok vydání: | 2005 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 93 We present measurements of CP-violating parameters in B0 -> phi K0, K+K-Ks, eta''Ks, and omegaKs decays based on a sample of 275 x 10^6 BBbar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB energy-asymmetric e+e- collider. One neutral B meson is fully reconstructed in one of the specified decay channels, and the flavor of the accompanying B meson is identified from its decay products. CP-violation parameters for each of the decay modes are obtained from the asymmetries in the distributions of the proper-time intervals between the two B decays. The combined result for decays sensitive to the b->s transition differs from the Standard Model expectation by 2.4 standard deviations. We also provide measurements of decay amplitudes and triple-product correlations in B -> phi K* decays. The decay amplitudes for the three different helicity states are determined from the angular distributions of final state particles. The longitudinal polarization amplitudes are found to be 0.45 +- 0.05 +- 0.02 for B0 -> phi K*0 and 0.52 +- 0.08 +- 0.03 for B+ -> phi K*+ decays. CP- and T-odd CP-violating triple-product asymmetries are measured and found to be consistent with zero. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|