SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 78: Flavor VII

T 78.6: Talk

Wednesday, March 22, 2023, 18:45–19:00, HSZ/0304

Semileptonic Charged Kaon Decays in NA62 — •Atakan Tugberk Akmete — Johannes Gutenberg University Mainz

The NA62 experiment at the CERN SPS was proposed and designed to measure the branching ratio of the ultra-rare K⁺ → π⁺ ν ν using a decay-in-flight technique. NA62 took data of K_πνν in 2016, 2017, 2018, 2021 and 2022.

In such Kaon experiments, it is also possible to measure the branching ratios of the semileptonic decays K → π⁰ ℓ ν (γ) (K_ℓ3) with high precision. K_ℓ3 provides a very clean way to test the lepton universality and probe the first row of the unitary of the CKM quark mixing matrix |V_ud|² + |V_us|² + |V_ub|² = 1. The measurement is done by analyzing the charged single tracks to measure the six main decay modes at once without any specific PID. This strategy reduces the systematics and allows to measure of the branching fractions by using binned maximum-likelihood fit of each MC component to the data. In this talk, I will present my preliminary results using this method.