# Etude de la violation directe de CP dans la désintégration du méson B en mésons vecteurs incluant le mélange $\rho^0-\omega$ dans le cadre de l'expérience LHCb

Abstract : \rho^0 - \omega mixing effect on direct CP violation in B decay into vector mesons is one of the main studies of this work. The first part is dedicated to the calculation of the decay amplitudes of the channels B -> V \rho^0 (\omega) wich have been modelized. We used for that the helicity formalism. In such a way branching ratios and asymmetries depending on form factor models and other parameters are predicted. Direct CP violation appears at several levels: in branching ratios, in angular distributions and in differential asymmetry as a function of \rho^0 - \omega mass. The dominance of the longitudinal polarization in the studied channels is confirmed by Babar and Belle experimental results. We calculated too the strong phase and the ratio of Penguin to Tree amplitudes for each modelized channel. In a second part, was developed an analysis of the channel B0 -> K*0 \rho^0 (\omega) in the framework of LHCb experiment. It will start in 2007 and is dedicated to b flavor study and CP violation. The realistic analysis wich has been performed shows that this channel is not appropriated to observe \rho^0 - \omega mixing effect on asymmetry in LHCb, while the \rho+ \rho^0 (\omega) channel, for wich we have predicted a branching ratio value confirmed by Babar and Belle, is much more promising.
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Cited literature [24 references]

https://tel.archives-ouvertes.fr/tel-00006159
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Submitted on : Thursday, May 27, 2004 - 5:01:11 PM
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• HAL Id : tel-00006159, version 1

### Citation

Cécile Rimbault. Etude de la violation directe de CP dans la désintégration du méson B en mésons vecteurs incluant le mélange $\rho^0-\omega$ dans le cadre de l'expérience LHCb. Physique des Hautes Energies - Expérience [hep-ex]. Université Blaise Pascal - Clermont-Ferrand II, 2004. Français. ⟨tel-00006159⟩

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