Search for the Rare Decay K_{L}\toπ^{0}π^{0}γ

Details Search for the Rare Decay K_{L}\toπ^{0}π^{0}γ Search for the Rare Decay K_{L}\toπ^{0}π^{0}γ

2007-08-21

arxiv.org/abs/0708.2874v2

Phys.Rev.D78:032014,2008

Physics

High Energy Physics

High Energy Physics - Experiment

six pages and six figures in the submission. Reformatted for Physics Review D

Scientific paper

10.1103/PhysRevD.78.032014

The KTeV E799 experiment has conducted a search for the rare decay $K_{L}\to\pi^{0}\pi^{0}\gamma$ via the topology $K_{L}\to\pi^{0}\pi^{0}_D\gamma$ (where $\pi^0_D\to\gamma e^+e^-$). Due to Bose statistics of the $\pi^0$ pair and the real nature of the photon, the $K_{L}\to\pi^{0}\pi^{0}\gamma$ decay is restricted to proceed at lowest order by the CP conserving direct emission (DE) of an E2 electric quadrupole photon. The rate of this decay is interesting theoretically since chiral perturbation theory predicts that this process vanishes at level $O(p^4)$. Therefore, this mode probes chiral perturbation theory at $O(p^6)$. In this paper we report a determination of an upper limit of $2.43\times 10^{-7}$ (90% CL) for $K_{L}\to\pi^{0}\pi^{0}\gamma$. This is approximately a factor of 20 lower than previous results.

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