Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 3: Flavour Physics 1

T 3.8: Vortrag

Montag, 21. März 2022, 18:00–18:15, T-H16

Normalization of the rare K⁺ → π⁺ ν ν decay by a K⁺ → π⁺ π⁰ / K⁺ → µ ν measurement with NA62 — •ATAKAN TUĞBERK AKMETE — JOHANNES GUTENBERG UNIVERSITÄT, MAINZ

The ultra-rare K⁺ → π⁺ ν ν decay has a precisely predicted Standard Model branching ratio of 8.4 ± 1.0 × 10⁻¹¹ which is almost free from theoretical uncertainties. Therefore, this SM limit can be tested by a precision measurement. Further, the very high sensitivity of this decay also makes it one of the most suitable candidates to investigate indirect effects of new physics in the flavour sector.

The NA62 experiment at the CERN SPS was proposed and designed to measure this branching ratio by using a decay-in-flight technique. NA62 took data of the K⁺ → π⁺ ν ν decay in 2016, 2017, 2018 and 2021. The previous analyses yielded the most precise branching-ratio measurement of the decay. In those analyses, the K⁺ → π⁺ π⁰ was used as normalization in order to extract the number of kaon decays for the K⁺ → π⁺ ν ν branching ratio measurement.

However, it is also possible to use another normalization mode, K⁺ → µ ν, which can be useful for eliminating undesirable effects that were considered in the previous analyses such as photon and multiplicity rejections. In this talk, I will be discussing the results of this K⁺ → µ ν normalization mode and representing a new measurement on K⁺ → π⁺ π⁰ / K⁺ → µ ν.