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Search for the decay $K_{S} \to \pi^{0} \gamma\gamma$ / NA48 Collaboration
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 $BR(K_{S} \to \pi^{0} \gamma\gamma, z \geq 0.2) < 3.3 \times 10^{-7}$ has been obtained at 90% confidence level, where $z = m_{\gamma\gamma}^{2}/m_{K_{0}}^{2}$..
hep-ex/0212054; CERN-EP-2002-101; CERN-EP-2002-101.- Geneva : CERN, 2003-03-20 - 12 p. - Published in : Phys. Lett. B 556 (2003) 105-13 Fulltext: ep-2002-101 - PDF; arXiv:hep-ex_0212054 - PDF; External link: Preprint - Please contact the library if you need to access this document.

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