Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 22: Flavour physics 1
T 22.4: Talk
Monday, March 4, 2024, 16:45–17:00, Geb. 30.41: HS 4
Time-dependent studies of Bs0-meson decays at the LHCb experiment — Johannes Albrecht and •Quentin Führing — TU Dortmund University, Dortmund, Germany
The system of neutral Bs0 mesons provides experimental access to the CKM sector of the Standard Model. The neutral meson oscillation is not only a measurable observable itself but also enables CP-violating effects in the interference of direct decay and decay after mixing.
Flavour-specific decay modes, like Bs0 → Ds− π+, can be used for a clean measurement of the oscillation frequency Δ ms. This frequency itself can be utilized to constrain the sides of the unitarity triangles. More importantly, it is a crucial input to all time-dependent measurements of CP violation in Bs0-meson decays.
The decay to a CP eigenstate, such as Bs0 → J/ψ φ, gives access to the CP-violating phase φs. Together with this information the analysis of Bs0 → Ds∓K± decays allows for the determination of the CKM angle γ. While these decay modes, dominated by tree-level processes, allow for clean measurements of the CP-violating phases, in other modes effects from the presence of loop processes have to be accounted for.
At the LHCb experiment, these decay-time-dependent studies can be performed with high sensitivity, as the fast Bs0 oscillation can be well resolved due to the O(50 fs) decay-time resolution of the detector. The crucial information of the Bs0-meson flavour at the time of its production is derived by various flavour-tagging algorithms.
An overview of the latest published analyses and ongoing developments in this field will be presented.
Keywords: LHCb; Mixing; CPV; CKM; Flavour Tagging