Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 15: CP-Verletzung und Mischung

T 15.7: Talk

Monday, March 25, 2019, 17:35–17:50, S15

Measurement of CP violation in B⁰→ J/ψ K_S⁰ decays with the LHCb detector using Run II data — •Vukan Jevtic and Patrick Mackowiak — 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 in the interference of mixing and the decay in the B⁰→ J/ψ K_S⁰ channel at LHCb reached a sensitivity for sin(2β) that is comparable to measurements of Belle I and BaBar. Due to the higher centre-of-mass energy of √s=13 TeV at the LHC in Run II, more data was taken at higher rates, which helps to increase the statistical significances of analyses. At the same time, this poses new 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 measurement of the CP-violation parameters in B⁰→ J/ψ(→µµ)K_S⁰(→π⁺π⁻) decays will be presented and new reconstruction possibilities of K_S⁰ mesons will be discussed.