Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 78: Flavour Physics V
T 78.8: Talk
Thursday, March 19, 2026, 18:00–18:15, KH 02.014
Measurement of the Oscillation Frequency Δ ms 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 ms in the Bs0 −Bs0 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 ms 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 Bs0 → Ds−π+ with Ds− → φ0 (→ K−K+)π− is studied and the oscillation frequency, Δ ms, resolved with a statistical uncertainty of 0.0156 ps−1.
Keywords: Flavour Physics; Bs-mixing; Neutral meson mixing; Time-dependent; Flavour tagging