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T: Fachverband Teilchenphysik

T 22: CP: B-Mesonen, Kaon

T 22.7: Talk

Monday, March 9, 2015, 18:15–18:30, L.09.28 (HS 12)

Measurement of the Form Factors in the Decay Channel K⁺ → π⁰ e⁺ ν_e — •David Lomidze — Institute of physiks, Mainz

Within the Standard Model, semileptonic kaon decays can provide the experimentally most accurate and theoretically cleanest way for determination of the element |V_us| of the CKM matrix. To do this, a precise knowledge of the form factors in K⁺ → π⁰ e⁺ ν_e (Ke3) decays is crucial.

The NA62 experiment at CERN collected huge sample of Ke3 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. This talk reports preliminary measurements of the form factors of the semileptonic decay K⁺ → π⁰ e⁺ ν_e, based on 50 million Ke3 events with negligible background.