Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 4: Quark mixing and CP violation

T 4.4: Vortrag

Montag, 15. März 2021, 16:45–17:00, Td

Measurement of the Bs0 oscillation frequency Δ ms with Bs0Ds π+ decays at the LHCb experiment — •Quentin Führing and Kevin Heinicke — Experimentelle Physik 5, TU Dortmund

The Bs0Bs0 oscillation frequency Δ ms is equivalent to the mass difference of the Bs0 mass eigenstates. This frequency is an important Standard Model measurement in its own right, and a precise measurement is crucial for reducing the systematic uncertainties associated with time-dependent CP violation measurements in the Bs0Bs0 system.

At the LHCb experiment, the parameter Δ ms has previously been measured using data of Bs0Ds π+ decays, recorded in 2011, corresponding to an integrated luminosity of Lint = 1.0 fb−1. In this talk, an updated measurement of Δ ms is presented. The analysis uses an larger dataset, recorded with the LHCb experiment between 2015 and 2018, corresponding to an integrated luminosity of Lint = 5.7 fb−1.

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