Phys. Rev. Lett. 99, 081803 (2007) [5 pages]

First Observation of K_L→π^±e^∓νe⁺e^-

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E. Abouzaid et al. KTeV Collaboration
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Received 22 May 2007; published 24 August 2007

This Letter is the first report of the K_L→π^±e^∓νe⁺e^- decay. Based on 19 208±144 events, we determine the branching fraction, B(K_L→π^±e^∓νe⁺e^-;M_e⁺e^->5 MeV/c²,E_e⁺e^-^*>30 MeV)=(1.285±0.041)×10^-5, and Γ(K_e3ee;M_e⁺e^->5 MeV/c²)/Γ(K_e3)=[4.57±0.04(stat)±0.14(syst)]×10^-5. This ratio agrees with a theoretical prediction based on chiral perturbation theory (ChPT) calculated to O(p⁴). The measured kinematical distributions agree with those predicted by just ChPT O(p⁴), but show significant disagreement with ones predicted by leading-order ChPT.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.99.081803

DOI:

10.1103/PhysRevLett.99.081803

PACS:

13.20.Eb, 12.39.Fe, 14.40.Aq

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