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Mesure de l'angle gamma de la matrice CKM à l'aide des désintégrations B- en D0K*- en utilisant le détecteur BABAR à SLAC.

Abstract : CP violation in the B mesons system has been studied by the B factories for almost 8 years. After a first success with the high precision measurement of the Unitarity Triangle angle beta, they are now facing a new challenge: the study of the two last angles, alpha and gamma, which are still poorly known. The work presented in this thesis is related to the measurement of the angle gamma using the B- to D0K*- events from data collected by the BABAR detector at SLAC. The method implied is based on the interferences between two amplitudes along the Dalitz plot of the three-body decay D0 to Ks pi pi, one related to the Vub element of the CKM matrix and the other related to the Vcb element. This method have already been used in the measurement of gamma in B- to D0 K- and B- in D*0 K- decays. Adding the new mode B- to D0 K*- helps improving the statistical error of the measurement by 3 degrees which leads to gamma = (67 +- 28 +- 13 +- 11) degrees. The first error is statistical, the second one comes from experimental systematic uncertainties and the third one is the systematic uncertainty associated to the model used to describe the Dalitz plot D0 to Ks pi pi. Since this model is a crucial point for the analysis, we describe it in detail. For the future, in order to improve the measurement of gamma, it will be necessary to refine the Dalitz model as the number of events available at the B factories will increase.
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https://tel.archives-ouvertes.fr/tel-00185121
Contributor : Stéphane Pruvot <>
Submitted on : Monday, November 5, 2007 - 2:16:20 PM
Last modification on : Wednesday, September 16, 2020 - 4:23:38 PM
Long-term archiving on: : Monday, April 12, 2010 - 1:19:35 AM

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  • HAL Id : tel-00185121, version 1

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Stéphane Pruvot. Mesure de l'angle gamma de la matrice CKM à l'aide des désintégrations B- en D0K*- en utilisant le détecteur BABAR à SLAC.. Physique des Hautes Energies - Expérience [hep-ex]. Université Paris Sud - Paris XI, 2007. Français. ⟨tel-00185121⟩

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