On the K⁺ → π⁰π⁰π⁰ e⁺ ν decay

2024/12/19 by E. K. Karkaryan, Karkaryan, E. K., K. V. Kiselev +7
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2412.15407

openalex publication_date 2024/12/19 · openalex created_date 2024/12/24 · openalex updated_date 2026/07/28

Abstract

The OKA Collaboration has obtained a new upper limit on the K⁺ → π⁰π⁰π⁰ e⁺ ν decay probability which is 65 times lower than the one currently listed by PDG. However it is still about 10⁴ times worse than the theoretical prediction. It was suggested that production of pionium A_2π in the final state of the semileptonic K⁺ decay with subsequent A_2π → π⁰ π⁰ decay will increase the value of theoretical branching ratio due to the absence of five-particle phase space suppression. The estimates done in our paper show that despite the gain in the phase space the decay K⁺ → A_2ππ⁰ e⁺ ν appeares to be strongly suppressed because of the smallness of the pionium wave function at zero π mesons separation.

Related

• The upper limit on the K⁺ → π⁰π⁰π⁰e⁺ν decay
• Observation of K⁺ → π⁺π⁰π⁰γ decay
• Search for K⁺ decays into the π⁺e⁺e^-e⁺e^- final state
• Does the existence of f₀ meson enlarge the K⁺ → π⁰π⁰π⁰ e⁺ ν decay probability?
• Observation of the decay K⁺→ π⁺ νν