Hamburg 2016 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 71: Flavour-Physik und CP-Verletzung im D- und K-System

T 71.6: Vortrag

Mittwoch, 2. März 2016, 18:00–18:15, VMP6 HS F

Measurement of the mixing parameters of neutral charm mesons and search for indirect CP violation with D⁰ → K_S⁰ π⁺ π⁻ decays at LHCb — •Stefanie Reichert and Johannes Albrecht — Technische Universität Dortmund

The hadronic decay D⁰ → K_S⁰ π⁺ π⁻ provides direct access to the measurement of the mixing parameters of the neutral charm meson system and allows to test for CP violation. In the neutral D meson system, the physical eigenstates D_1,2 are a linear superposition of the flavour eigenstates D⁰ and D⁰ as |D_1,2⟩ = p |D⁰⟩ ± q | D⁰ ⟩. A measurement of the mixing parameters x ≡ (m₁−m₂)/Γ and y ≡ (Γ₁−Γ₂)/(2Γ) as well as of the parameters |q/p| and φ = ar(q,p), which govern indirect CP violation, will be performed based on a time-dependent amplitude-model analysis of the full LHCb dataset of 2011 and 2012, corresponding to an integrated luminosity of 3   fb⁻¹. The decay mode D⁰ → K_S⁰ π⁺ π⁻ is accessible via D^* decays produced directly in the pp collisions as well as via semileptonic B decays. Through a combined fit of both data sets, the measurement will be sensitive at all D⁰ decay times. The status of the analysis will be presented.