First search for K⁺→π⁰πμe decays

2024/09/03 by NA62 Collaboration
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2409.12981

openalex publication_date 2024/09/03 · openalex created_date 2024/09/25 · openalex updated_date 2026/07/28

Abstract

The first search for the lepton number violating decay K⁺→π⁰π^-μ⁺e⁺ and lepton flavour violating decays K⁺→π⁰π⁺μ^-e⁺, K⁺→π⁰π⁺μ⁺e^- has been performed using a dataset collected by the NA62 experiment at CERN in 2016-2018. Upper limits of 2.9× 10^-10, 3.1× 10^-10 and 5.0× 10^-10, respectively, are obtained at 90% CL for the branching ratios of the three decays on the assumption of uniform phase-space distributions.

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