Measurement of the Decay KL -> Pi0 Gamma Gamma

Details Measurement of the Decay KL -> Pi0 Gamma Gamma Measurement of the Decay KL -> Pi0 Gamma Gamma

1999-02-22

arxiv.org/abs/hep-ex/9902029v1

Phys.Rev.Lett.83:917-921,1999

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.83.917

We report on a new measurement of the decay KL -> pi0 gamma gamma by the KTeV experiment at Fermilab. We determine the KL -> pi0 gamma gamma branching ratio to be (1.68 +/- 0.07 +/- 0.08)x10**-6. Our data shows the first evidence for a low-mass gamma gamma signal as predicted by recent O(p**6) chiral perturbation calculations that include vector meson exchange contributions. From our data, we extract a value for the effective vector coupling aV = -0.72 +/- 0.05 +/- 0.06.

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