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Theses

Measurement of the angle gamma of the Unitarity Triangle with BaBar experiment

Abstract : In the thesis we present studies of the B mesons system performed using the full dataset collected by the BABAR experiment at the PEP-II collider at SLAC. The first analysis presented is the search of the rare Vub mediated decays B+→D+K(*)0. These decays are particularly interesting because they are expected to be dominated by the annihilation processes and can provide insight to the internal dynamics of the B mesons. Another point of interest is coming from the fact that the rates of these decays can be used to constrain the annihilation amplitudes in phenomenological fits. This allows the translation of the measurements of the charged B+→D+K(*)0 amplitudes into estimations of the Vub suppressed amplitudes of B0→D0K(*)0. The experimental analysis is performed looking at several D+ decay modes. No signals have been found and upper limits have been set. In the second part of the thesis we present CP violation studies in the B meson system, and in particular measurements of the angle γ of the Unitarity Triangle. The angle γ is the relative weak phase between the Vub and Vcb elements of the CKM matrix. A crucial parameter, which drives the sensitivity to γ, is the ratio r between b→u and b→c transition amplitudes. We present and describe the analysis using the charged B meson decays: B+→D0K+. These decays are studied through the ADS method, where the neutral D mesons are reconstructed into Kππ0 final states. Combining this analysis with a similar one that used Kπ as a D0 final state the ratio r and the angle γ have been obtained.
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https://tel.archives-ouvertes.fr/tel-00541885
Contributor : Denis Derkach <>
Submitted on : Wednesday, December 1, 2010 - 2:05:12 PM
Last modification on : Wednesday, September 16, 2020 - 4:22:11 PM
Long-term archiving on: : Wednesday, March 2, 2011 - 3:08:17 AM

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  • HAL Id : tel-00541885, version 1

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D. Derkach. Measurement of the angle gamma of the Unitarity Triangle with BaBar experiment. High Energy Physics - Experiment [hep-ex]. Université Paris Sud - Paris XI, 2010. English. ⟨tel-00541885⟩

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