Mainz 2014 – scientific programme

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T: Fachverband Teilchenphysik

T 92: Flavour (Theorie/Experiment) 2

T 92.2: Talk

Wednesday, March 26, 2014, 17:00–17:15, GFH 01-701

Measurement of the Form Factors in the Decay Channel K^±→ π⁰ e^±ν_e — •David Lomidze — Institut für Physik, Johannes Gutenberg-Universität, Mainz, Germany

The increasing precision with which the unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) quark mixing matrix can be tested is an important tool for exploring the limits of the Standard Model. One such unitarity relation is |V_ud |² + |V_us|² + |V_ub|² = 1 whose uncertainty is dominated by the precision of |V_us |.
The K^±→ π⁰ e^±ν_e (K_e3) decay provides an excellent way for an accurate determination of the CKM matrix element |V_us|. To do this, a precise knowledge of the form factors in K_e3 decays is crucial.

The NA62 experiment at CERN collected a about 40 million K_e3 decays during a dedicated physics run in 2007 for the measurement of the ratio R_K = Γ(K⁺ → e⁺ ν)/Γ(K⁺ → µ⁺ ν). With these statistics, a determination of the form factors with high precision is possible.