Search for the Decay Kl -> pi0 e+ e-

Details Search for the Decay Kl -> pi0 e+ e- Search for the Decay Kl -> pi0 e+ e-

2000-09-12

arxiv.org/abs/hep-ex/0009030v1

Phys.Rev.Lett.86:397-401,2001

Physics

High Energy Physics

High Energy Physics - Experiment

13 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.86.397

We report on a search for the decay Kl -> pi0 e+ e- carried out by the KTeV/E799 experiment at Fermilab. This decay is expected to have a significant CP violating contribution and the measurement of its branching ratio could support the CKM mechanism for CP violation or could point to new physics. Two events were observed in the 1997 data with an expected background of 1.06 +-0.41 events, and we set an upper limit Br(Kl -> pi0 e+ e-) < 5.1 x 10^-10 at the 90% confidence level.

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