Observation du canal Bs en eta_c phi avec l'expérience LHCb

Abstract : The interference between B0s meson decay amplitudes to CP final state directly or via mixing gives rise to a measurable CP-violating phase ϕs, which is predicted to be ϕSMs=(−0.0370±0.0006) rad in the Standard Model. However, such process may receive contributions from New Physics and change the value of ϕs. At present, the most precise measurement of ϕs is given by the LHCb experiment and the world average is ϕexps=(−0.021±0.032) rad, with uncertainty still dominated by the statistics. In this context, a study of B0s→ηcϕ decays is performed using pp collision data corresponding to an integrated luminosity of~3.0\,fb−1, collected with the LHCb detector during the Run~1 of the LHC. The observation of the decay B0s→ηcϕ is reported, where the ηc meson is reconstructed in the pp¯, K+K−π+π−, π+π−π+π− and K+K−K+K− decay modes and the ϕ(1020) in the K+K− decay mode. The decay B0s→Jψϕ is used as a normalization channel. The measured branching fraction is B(B0s→ηcϕ)=(5.01±0.53±0.27±0.63)×10−4, where the first uncertainty is statistical, the second systematic and the third uncertainty is due to the limited knowledge of the external branching fractions.
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Morgan Martin. Observation du canal Bs en eta_c phi avec l'expérience LHCb. Physique des Hautes Energies - Expérience [hep-ex]. Aix-Marseille Université, 2017. Français. ⟨tel-02165303⟩

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