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T: Fachverband Teilchenphysik

T 78: Flavour Physics V

T 78.8: Vortrag

Donnerstag, 19. März 2026, 18:00–18:15, KH 02.014

Measurement of the Oscillation Frequency Δ m_s with 2024 Data of the Upgraded LHCb Experiment — •Johann Nicolas Himbert¹, Stephanie Hansmann-Menzemer¹, Lennart Uecker¹, Sara Celani², and Marc Quentin Führing³ — ¹Physikalisches Institut Heidelberg University, Heidelberg, Germany — ²CERN, Switzerland — ³TU Dortmund University, Dortmund, Germany

The measurement of the oscillation frequency Δ m_s in the B_s⁰ −B_s⁰ system is an excellent showcase of the capabilities of the upgrade LHCb experiment in Run 3. The LHCb detector in Run 3 is collecting data at a five times larger instantaneous luminosity than in Run 2. To cope with this increased luminosity, all subdetectors and their readout-electronics have undergone major upgrades and a fully software based trigger has been implemented. The later improves the acceptance of softer decays for multi-body hadronic final states, which results in a three times larger yield of signal candidates per fb⁻¹. For the measurement of Δ m_s new dedicated Run 3 flavour-tagging algorithms and the excellent decay time resolution of the upgrade detector are exploited to resolve the oscillation. On a small test data set of 1.2 fb⁻¹ the decay channel B_s⁰ → D_s⁻π⁺ with D_s⁻ → φ⁰ (→ K⁻K⁺)π⁻ is studied and the oscillation frequency, Δ m_s, resolved with a statistical uncertainty of 0.0156 ps⁻¹.

Keywords: Flavour Physics; Bs-mixing; Neutral meson mixing; Time-dependent; Flavour tagging