Search for a light pseudoscalar particle in the decay $K_L^0\to {\pi }^0{\pi }^{0}X$

Abstract

We performed a search for a light pseudoscalar particle $X$ in the decay $K_L^0->pi0pi0X$, $X->\gamma \gamma$ with the E391a detector at KEK. Such a particle with a mass of 214.3 MeV/$c^2$ was suggested by the HyperCP experiment. We found no evidence for $X$ and set an upper limit on the product branching ratio for $K_L^0->pi0pi0X$, $X->\gamma \gamma$ of $2.4\times 10^{-7}$ at the 90% confidence level. Upper limits on the branching ratios in the mass region of $X$ from 194.3 to 219.3 MeV/$c^2$ are also presented.

5 pages, 5 figures

References in corpus (5)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006
• Has HyperCP Observed a Light Higgs Boson?
• Search for the Decay $K_L^0\to {\pi }^0\nu \bar{\nu }$
• First search for $K_L\to {\pi }^0{\pi }^0\nu \bar{\nu }$

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