Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 63: Flavorphysik II

T 63.6: Talk

Wednesday, March 27, 2019, 17:15–17:30, S15

Search for B_s⁰ → ψ(2S) K_S⁰ decays at the LHCb experiment — Vukan Jevtic, •Jasper Lammering, and Patrick Mackowiak — Experimentelle Physik 5, TU Dortmund

The decay B_s⁰ → ψ(2S) K_S⁰ has not been observed yet but is predicted by the Standard Model. In a previous analysis, where CP-violation was measured in B⁰ → ψ(2S) K_S⁰, performed by LHCb using the Run I dataset, a hint for the B_s decay has been seen. Therefore the observation is expected by analyzing more data and developing a specialized selection for such decays. In order to cancel systematic uncertainties, the ratio of branching fractions B(B_s⁰ → ψ(2S) K_S⁰)/B(B⁰ → ψ(2S) K_S⁰) is measured. In this talk, the current status of the analysis using the complete LHCb dataset corresponding to an integrated luminosity of 9 fb⁻¹ is presented.