Search for the rare decays π⁺ → μ⁺ν_μνν and π⁺ → e⁺ν_eνν

2020/05/30 by A. Aguilar-Arevalo, M. Aoki, M. Blecher +23 · 2 citations
Physics and Astronomy · #hep-ex #hep-ph

paper · pdf · doi:10.1103/physrevd.102.012001

published as Phys. Rev. D 102, 012001 (2020) · 6 figures

arxiv created 2020/05/30 · arxiv updated 2020/07/08

Abstract

The rare pion decays π⁺→μ⁺ν_μνν and π⁺→e⁺ν_eνν are allowed in the Standard Model but highly suppressed. These decays were searched for using data from the PIENU experiment. A first result for Γ(π⁺→μ⁺ν_μνν)/Γ(π⁺→μ⁺ν_μ)<8.6×10^-6, and an improved measurement Γ(π⁺→e⁺ν_eνν)/Γ(π⁺→μ⁺ν_μ)<1.6×10^-7 were obtained.

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