Search for a light pseudoscalar particle in the decay $K^0_L \to π^0 π^0 X$

Details Search for a light pseudoscalar particle in the decay $K^0_L \to π^0 π^0 X$ Search for a light pseudoscalar particle in the decay $K^0_L \to π^0 π^0 X$

2008-10-23

arxiv.org/abs/0810.4222v3

Phys.Rev.Lett.102:051802,2009

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.102.051802

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.

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