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Precise measurements of the $K_{S}\to\gamma\gamma$ and $K_{L}\to\gamma\gamma$ decay rates / NA48 Collaboration
The $K_{S} \to \gamma\gamma$ decay rate has been measured with the NA48 detector using a high intensity short neutral beam from the CERN SPS. The measured branching ratio BR($K_{S}) \to \gamma\gamma = (2.78 \pm 0.06_{stat} \pm 0.04_{syst}) \times 10^{-6}$, obtained from 7461$\pm$172 $K_{S} \to \gamma\gamma$ events, is significantly higher than the $O(p^{4})$ prediction of Chiral Perturbation Theory. [...]
hep-ex/0210053; CERN-EP-2002-074; CERN-EP-2002-074.- Geneva : CERN, 2003 - 10 p. - Published in : Phys. Lett. B 551 (2003) 7-15 Fulltext: ep-2002-074 - PDF; arXiv:hep-ex_0210053 - PDF; S0370269302029556 - XML; External link: Preprint - Please contact the library if you need to access this document.

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