CERN Accelerating science

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First observation of the $K_{S}\to \pi^{0}\gamma\gamma$ decay / NA48 Collaboration
Using the NA48 detector at the CERN SPS, 31 $K_{S}\to \pi^{0}\gamma\gamma$ candidates with an estimated background of $13.7 \pm 3.2$ events have been observed. This first observation leads to a branching ratio of $BR(K_{S}\to \pi^{0}\gamma\gamma)_{z>0.2} = (4.9 \pm 1.6_{stat} \pm 0.9_{syst}) \times 10^{-8}$ in agreement with Chiral Perturbation theory predictions..
hep-ex/0309022; CERN-EP-2003-052; CERN-EP-2003-052.- Geneva : CERN, 2004 - 10 p. - Published in : Phys. Lett. B 578 (2004) 276-284 Fulltext: arXiv:hep-ex_0309022 - PDF; ep-2003-052 - PDF; S0370269303016782 - XML; External link: Preprint - Please contact the library if you need to access this document.

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