Bonn 2020 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 74: Flavor physics: CKM II

T 74.8: Vortrag

Donnerstag, 2. April 2020, 18:15–18:30, H-HS XI

Measurement of CP violation in B⁰→[cc]K_S⁰ decays with the LHCb experiment using 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. Previous measurements of CP-violation parameters in B⁰→ J/ψ K_S⁰ decays using the Run I dataset that was taken at centre-of-mass energies of 7 and 8 TeV reached a sensitivity for the parameter sin(2β) comparable to Belle and BaBar. With the full LHCb Run II dataset at √s=13 TeV, the statistical significance of this measurement is expected to increase as more data was collected at higher rates. At the same time, this poses challenges, for example in the reconstruction of particle tracks in datasets with high background contamination and track multiplicities. In this talk, the status of the ongoing measurement of the CP-violation parameters will be presented with a focus on the decays B⁰→ J/ψ(→µµ)K_S⁰(→π⁺π⁻) and B⁰→ ψ(2S)(→µµ)K_S⁰(→π⁺π⁻).