Abstract
The determination of the mixing-induced CP-violating phase ϕs in the B0s - B0s system is one of the key goals of the LHCb experiment. Using several B0s decay modes it has been measured by the LHCb collaboration exploiting the Run I data set. The first observation of the B0s → ηcϕ and B0s → ηcπ+π- decay modes which can be used to measure ϕs with Run II data is presented.
Highlights
The CP-violating phase φs originates from the interference between the mixing and direct decay of the B0s mesons to CP eigenstates
The most precise measurement of CP-violating phase φs and lifetime parameters in the B0s system has been performed using Run I data collected by LHCb experiment
All results are compatible with the Standard Model (SM) prediction
Summary
The CP-violating phase φs originates from the interference between the mixing and direct decay of the B0s mesons to CP eigenstates. The phase φs within the Standard Model (SM) is predicted termination of 2βs = 0.0376+−00..00000087 to be −2βs where βs = rad is obtained using a arg(−VtsVt∗b/VcsVc∗b) [1]. An indirect deglobal fit to experimental data [2]. Any deviation from this prediction would be a clear sign, so-called New Physics effects, strongly motivating the need for precise experimental measurements of this quantity [3]. The measurement of CP-violating phase φs has been independently performed using B0s → J/ψK+K−, B0s → J/ψπ+π− and B0s → ψ(2S )φ decay channels. All measurements shown in the proceedings use 3 fb−1 of data collected by the LHCb experiment [4] in pp collisions during 2011 and 2012
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