Search for the rare decay KLπ0π0γ

E. Abouzaid et al. (KTeV Collaboration)
Phys. Rev. D 78, 032014 – Published 21 August 2008

Abstract

The KTeV E799 experiment has conducted a search for the rare decay KLπ0π0γ via the topology KLπ0πD0γ (where πD0γe+e). Because of Bose statistics of the π0 pair and the real nature of the photon, the KLπ0π0γ 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(p4). Therefore, this mode probes chiral perturbation theory at O(p6). In this paper we report a determination of an upper limit of 2.43×107 (90% CL) for KLπ0π0γ. This is approximately a factor of 20 lower than previous results.

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  • Received 21 August 2007

DOI:https://doi.org/10.1103/PhysRevD.78.032014

©2008 American Physical Society

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Vol. 78, Iss. 3 — 1 August 2008

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