SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 2: Flavor I

T 2.3: Vortrag

Montag, 20. März 2023, 17:00–17:15, HSZ/0004

Flavour tagging, B_s→ D_sK, and B⁰→ J/ψ K_S — Quentin Führing, Vukan Jevtic, Gerwin Meier, •Sophie Hollitt, and Johannes Albrecht — TU Dortmund University, Dortmund, Germany

The amount of CP violation in the Standard Model is insufficient to explain the universe’s matter-antimatter asymmetry. Precision measurements of CP violation in decays–including measurements of the angles of the ‘CKM triangle’ to test for unitarity–are crucial to further understand CP violation in the Standard Model and reveal any possible hints of new physics. Determining the flavour of the B meson at the time of production with flavour tagging is a key part of this process.

In this talk we consider analyses for two of the three CKM angles: the angle γ using the decay B_s⁰ → D_s K, and the angle β using the channel B⁰→ J/ψ K_S. The LHCb experiment provides a large number of B_s meson decays with an excellent decay time resolution, that can be used to measure B_s→ D_sK and provide an additional constraint on γ. For sin(2β), the statistical significance of previous measurements of B⁰→ J/ψ K_S can be improved by including additional track reconstruction types and more decay channels in this updated analysis.