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T: Fachverband Teilchenphysik

T 4: Quark mixing and CP violation

T 4.3: Talk

Monday, March 15, 2021, 16:30–16:45, Td

Measurement of CP violation in B⁰→ ψ K_S⁰ decays with the LHCb detector using the full Run II data — Vukan Jevtic, Patrick Mackowiak, and •Gerwin Meier — Experimentelle Physik 5, TU Dortmund

The measurement of the CKM angle β is an important precision test of the Standard Model. The golden mode of this observable is B⁰ → J/ψ K_S⁰, because of its domination by tree-level amplitudes. With new reconstruction types of the K_S⁰ and the combination of different decay channels it is possible to increase the statistical sensitivity to the most precise measurement of this quantity.

In this talk the current status of the CP violation measurement in the decays B⁰ → J/ψ(→ ℓ^±ℓ^∓)K_S⁰(→ π^±π^∓) with ℓ=e,µ and B⁰ → ψ(2S)(→ µ^±µ^∓)K_S⁰(→ π^±π^∓) will be presented for the full LHCb Run II dataset, which corresponds to 6 fb⁻¹.