Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 4: Quark mixing and CP violation

T 4.4: Talk

Monday, March 15, 2021, 16:45–17:00, Td

Measurement of the B_s⁰ oscillation frequency Δ m_s with B_s⁰ → D_s⁻ π⁺ decays at the LHCb experiment — •Quentin Führing and Kevin Heinicke — Experimentelle Physik 5, TU Dortmund

The B_s⁰−B_s⁰ oscillation frequency Δ m_s is equivalent to the mass difference of the B_s⁰ 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 B_s⁰−B_s⁰ system.

At the LHCb experiment, the parameter Δ m_s has previously been measured using data of B_s⁰ → D_s⁻ π⁺ decays, recorded in 2011, corresponding to an integrated luminosity of L_int = 1.0 fb⁻¹. In this talk, an updated measurement of Δ m_s is presented. The analysis uses an larger dataset, recorded with the LHCb experiment between 2015 and 2018, corresponding to an integrated luminosity of L_int = 5.7 fb⁻¹.