Search for the decay $K_L^0 \rightarrow 3γ$

Details Search for the decay $K_L^0 \rightarrow 3γ$ Search for the decay $K_L^0 \rightarrow 3γ$

2010-11-19

arxiv.org/abs/1011.4403v2

Phys.Rev.D83:031101,2011

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1103/PhysRevD.83.031101

We performed a search for the decay $K_L^0 \rightarrow 3\gamma$ with the E391a detector at KEK. In the data accumulated in 2005, no event was observed in the signal region. Based on the assumption of $K_L^0 \rightarrow 3\gamma$ proceeding via parity-violation, we obtained the single event sensitivity to be $(3.23\pm0.14)\times10^{-8}$, and set an upper limit on the branching ratio to be $7.4\times10^{-8}$ at the 90% confidence level. This is a factor of 3.2 improvement compared to the previous results. The results of $K_L^0 \rightarrow 3\gamma$ proceeding via parity-conservation were also presented in this paper.

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