Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 15: CP-Verletzung und Mischung

T 15.6: Talk

Monday, March 25, 2019, 17:20–17:35, S15

Measurement of the weak mixing phase φ_s in B_s⁰ → D_s⁺ D_s⁻ decays with the LHCb experiment — •Louis Gerken, Philipp Ibis, Antje Mödden, and Margarete Schellenberg — Experimentelle Physik 5, TU Dortmund

One research priority of the LHCb experiment is testing the Standard Model by the precise measurement of CP-violating parameters. In B_s⁰-meson decays with b→ ccs transitions, the weak mixing phase φ_s can be measured in the interference between the decay with and without B_s⁰-B_s⁰ mixing. Since φ_s is predicted to be small in the Standard Model, a significant deviation to this prediction could be evidence of New Physics.

In this talk the current status of the B_s⁰ → D_s⁺ D_s⁻ analysis will be presented. The analysis aims to measure φ_s by using data corresponding to an integrated luminosity of 6 fb⁻¹ collected by the LHCb detector during 2015 to 2018 at a centre-of-mass energy of 13 TeV.