Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 74: Flavor physics: CKM II

T 74.6: Talk

Thursday, April 2, 2020, 17:45–18:00, H-HS XI

Measurement of CP Violation in B_s⁰ → J/ψ K_S⁰ at LHCb — Vukan Jevtic, •Patrick Mackowiak, and Gerwin Meier — Experimentelle Physik 5, TU Dortmund

With larger datasets collected by the LHCb Experiment and the start of Belle II, future measurements of sin(2β) in the golden mode B⁰ → J/ψ K_S⁰ will be systematically limited by the uncertainty from penguin contributions. One ingredient to constrain these contributions is the measurement of CP violation in B_s⁰ → J/ψ K_S⁰, where the tree level contribution is Cabibbo suppressed. The larger oscillation frequency of B_s⁰ compared to B_d⁰ and the lower branching fraction lead to further challenges in the analysis. The talk will present the current status of the analysis in B_s⁰ → J/ψ K_S⁰ using the full Run II dataset collected by the LHCb Experiment corresponding to an integrated luminosity of 6 fb⁻¹.