Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 15: CP-Verletzung und Mischung

T 15.9: Talk

Monday, March 25, 2019, 18:05–18:20, S15

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

One way to uncover hiding places for New Physics are precise measurements of the CP parameters in the Standard Model. To extract the currently least known CKM-angle γ with the latest LHCb dataset of B_s⁰ → D_s^∓K^± decays, the B_s⁰- 1pt −1pt B_s⁰ oscillation frequency Δ m_s is needed as an external input.

At the LHCb experiment, the parameter Δ m_s has so far only 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. The uncertainty of this measurment is one of the leading systematic uncertainties of the current measurement of γ with the LHCb experiment. In this talk, the current status of an updated measurement of Δ m_s is presented. The analysis is using an extended dataset, recorded with the LHCb experiment between 2015 and 2017, corresponding to an integrated luminosity of L_int = 3.6 fb⁻¹.