Search for the decay $K_S\to {\pi }^0\gamma \gamma$

Abstract

A search for the decay $K_S\to {\pi }^0\gamma \gamma$ has been made using the NA48 detector at the CERN SPS. Using data collected in 1999 during a 40-hour run with a high-intensity $K_S$ beam, an upper limit for the branching ratio $BR(K_S\toπ^0γγ, z\ge 0.2)<3.3\times\nolinebreak 10^{-7}$ has been obtained at 90% confidence level, where $z=m_{\gamma \gamma }^2/m_{K_0}^2$.

12 pages, 4 figures; Submitted to Phys. Lett. B

References in corpus (6)

• A Unified Approach to the Classical Statistical Analysis of Small Signals
• A precision measurement of direct CP violation in the decay of neutral kaons into two pions
• A precise measurement of the direct CP violation parameter Re(epsilon'/epsilon)
• Precise measurement of the decay $K_L\to {\pi }^0\gamma \gamma$
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• First observation of the KS->pi0 gamma gamma decay
• Recent developments in rare kaon decays