Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 74: Flavor physics: CKM II

T 74.7: Talk

Thursday, April 2, 2020, 18:00–18:15, H-HS XI

Measurement of sin(2β) in the CP violating decays B⁰ → J/ψ(→ e^±e^∓)K_S⁰(→ π^±π^∓) with the LHCb experiment — Vukan Jevtic, Patrick Mackowiak, and •Gerwin Meier — Experimentelle Physik 5, TU Dortmund

High precision measurements of Standard Model parameters can be used to search for New Physics . The golden mode B⁰ → J/ψ K_S⁰, which is dominated by tree-level amplitudes, provides a clean measurement of the CKM angle β. Combining the measurements of sin(2β) 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 lead 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(→ e^±e^∓)K_S⁰(→ π^±π^∓) will be presented for the full LHCb Run II dataset, which corresponds to 6 fb⁻¹.