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T: Fachverband Teilchenphysik

T 51: Flavor physics: CKM I

T 51.7: Vortrag

Mittwoch, 1. April 2020, 18:00–18:15, H-HS XI

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

The LHCb experiment performs precision measurements of CP violation to test the Standard Model of particle physics. In B_s⁰ → D_s⁺ D_s⁻ decays, the CP-violating parameter φ_s can be measured. This weak mixing phase arises in the interference between the direct decay of the B_s⁰ meson and the decay after mixing.

In this talk, the selection of B_s⁰ → D_s⁺ D_s⁻ candidates for a measurement of φ_s will be presented. A challenging part of the selection is the suppression of hadronic background decays. The analysis uses the full Run II dataset corresponding to an integrated luminosity of 6 fb⁻¹ collected during 2015 to 2018 at a centre-of-mass energy of 13 TeV.