Aachen 2019 – scientific programme
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T: Fachverband Teilchenphysik
T 15: CP-Verletzung und Mischung
T 15.5: Talk
Monday, March 25, 2019, 17:05–17:20, S15
CP violation and lifetime measurements in the decay Bs0→ J/ψ K−K+ with the LHCb experiment — Stephanie Hansmann-Menzemer and •Simon Stemmle — Physikalisches Institut Heidelberg
Within the Standard Model (SM) the CP violating phase φs of the decay Bs0→ J/ψ K−K+ can be precisely constrained from indirect measurements. This makes the direct measurement of φs a sensitive test of the SM. A flavor tagged, time dependent angular analysis of Bs0→ J/ψ K−K+ and Bs0→ J/ψ K−K+ decays is presented, using 2 fb−1 of proton-proton collision data, recorded by the LHCb experiment in 2015 and 2016. Besides the CP violating phase, also the lifetime splitting ΔΓs in the Bs0 meson system and the decay width difference, Γs−Γd, between Bs0 and B0 mesons is precisely measured. The results are combined with the corresponding LHCb Run I analysis.