Study of the K0(L) --> pi0 pi0 nu nu-bar decay

Abstract

The rare decay K0(L) --> pi0 pi0 nu nu-bar was studied with the E391a detector at the KEK 12-GeV proton synchrotron. Based on 9.4 x 10^9 K0L decays, an upper limit of 8.1 x 10^{-7} was obtained for the branching fraction at 90% confidence level. We also set a limit on the K0(L) --> pi0 pi0 X (X --> invisible particles) process; the limit on the branching fraction varied from 7.0 x 10^{-7} to 4.0 x 10^{-5} for the mass of X ranging from 50 MeV/c^2 to 200 MeV/c^2.

5 pages, 5 figures

References in corpus (4)

• Experimental study of the decay $K_L^0\to {\pi }^0\nu \bar{\nu }$
• Search for the Decay $K_L^0\to {\pi }^0\nu \bar{\nu }$
• Search for a Low Mass Particle Decaying into mu^+ mu^- in B0-> K*0 X and B0-> rho0 X at Belle
• Search for the decay $K_L^0\to 3\gamma$

Cited by in corpus (10)

• Quark Flavor Phenomenology of the QCD Axion
• Experiments with K-Meson Decays
• Exploring leptoquark effects in hyperon and kaon decays with missing energy
• Flavor-changing hyperon decays with light invisible bosons
• Probing new physics with the kaon decays $K\to \pi \pi /E$
• Imprint of a new light particle at KOTO?
• Flavor phenomenology of light dark sectors
• Light dark-matter window constrained by \boldmath$K^{+}\to {\pi }^{+}$$+$$/E$
• Workshop summary -- Kaons@CERN 2023
• Sweeping the pion chimney for axion-like particles with KOTO