Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 52: Flavour Physics III

T 52.2: Vortrag

Mittwoch, 2. April 2025, 16:30–16:45, VG 1.104

Semileptonic Kaon decays in NA62 — •Atakan Akmete — Mainz University

The semileptonic charged kaon decays K⁺ → π⁰ ℓ⁺ ν (γ) (K_ℓ3) provide a clean way to test the e-µ lepton universality and probe the first row unitarity |V_ud|² + |V_us|² + |V_ub|² = 1 of the CKM matrix. Current results indicate a tension, known as the Cabibbo angle anomaly.

This work aims to update the branching fractions of K_ℓ3 decays, along with the other main K⁺ decay channels using a minimum bias low-intensity dataset collected by the NA62 experiment (CERN) in 2024. This dataset offers high statistics in a clean environment. The measurement is performed by analyzing single positively charged tracks, allowing all six main decay modes to be measured simultaneously.

In this talk, I will present the current status of the analysis, including the expected precision on the branching fractions.

Keywords: Cabibbo Angle Anomaly; CKM; Precision measurement; NA62; CERN