Latour, Emmanuel (2007) Measurement of the angle of the unitarity triangle of CKM matrix in the B DK decays in the Babar experiment. PhD thesis LLR, LLR, EP/X p.232.
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Abstract
This thesis applies the Gronau-London-Wyler (GLW) method to the BD*K decays in view of measuring the angle gamma of the unitarity triangle of the CKM matrix at the BaBar experiment.
After a review of CP violation, we describe the different paths used so far for measuring gamma, with a special emphasis on the GLW method. Then the analysis is presented. It relies on an optimized selection for maximising signal sensitivity, and on an extended maximum likelihood fit from which we extract the four GLW observables ACP±* and RCP±* related to gamma. Results obtained make use of Run 1 to 5 of BaBar, corresponding to 347 fb-1, i.e. 381106 B pairs. They are translated into cartesian coordinates x±* for comparing with Dalitz analysis. All the results are in agreement with previous measurements from BaBar an Belle when available. Precision is improved by a factor two on CP even observables and a factor three for CP odd observables, in particular due to the use of D*D0 decays, and is better on x±* than the world average of BaBar and Belle Dalitz measurements. The statistics used and the ambiguities of !
the GLW method prevent from obtaining a constrain on gamma with the GLW analysis alone. However the combination of our results with Dalitz measurements will improve this constraint.
| Item Type: | PhD Thesis (PhD) |
|---|---|
| Thesis Supervisor: | Bernard, Denis |
| Date: | 15 October 2007 |
| Board of examiners: | Philippe, Busson and Tim, Gershon and Dominique, Pallin and Olivier, Pene and Olivier, Schneider and Marie-Hélène, Schune |
| Ecole Doctorale: | ED 447 ECOLE DOCTORALE DE L'ECOLE POLYTECHNIQUE |
| Discipline: | LLR |
| Collection (Fonds): | EP/X |
| Institution: | EP/X |
| Department: | LLR |
| Subjects: | 3. Physics, Optics |
| Uncontrolled Keywords: | Standard Model, CP violation, CKM matrix, Unitarity triangle, Gamma angle, Gronau-London-Wyler method, BaBar, B meson, Modèle Standard, violation de CP, matrice CKM, Triangle d'unitarité, Gamma, méthode Gronau-London-Wyler, BaBar, méson B |
Table of content
Introduction
1) Des symétries au Modèle Standard
2) Modèle Standard et violation de CP
3) Mesure de Gamma
4) Dispositif expérimental
5) Reconstruction et préselection des événements
6) Etude des bruits de fond
7) Mesure des observables GLW pour les canaux B->D*K
8) Résultats
Conclusion et perspectives
| ID Code: | 3376 |
|---|---|
| Deposited By: | Laurence Vidament |
| Deposited On: | 06 February 2008 |
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