Measurement of the Decay $K_{L} \to π^{0} γ γ$

2 August 1999

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 83 (5) , 917-921
https://doi.org/10.1103/physrevlett.83.917

Abstract

We report on a new measurement of the decay

K_{L} \to π^{0} γ γ

by the KTeV experiment at Fermilab. We determine the

K_{L} \to π^{0} γ γ

branching ratio to be

(1.68 \pm 0.07 \pm 0.08) \times 10^{- 6}

. Our data show the first evidence for a low-mass

γ γ

signal as predicted by recent

O (p^{6})

chiral perturbation calculations which include vector meson exchange contributions. From our data, we extract a value for the effective vector coupling

a_{V} = - 0.72 \pm 0.05 \pm 0.06

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Version 1, 1999-02-22, ArXiv

This publication has 9 references indexed in Scilit:

Vector meson exchange contributions to K → πγγ and KL → γℓ+ℓ−
Nuclear Physics B, 1997
The KTeV hardware cluster counter
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1996
Reanalysis of the decay $K_{L}$ → $π^{0}$ $e^{+}$ $e^{-}$
Physical Review D, 1995
Analysis of the decay $K_{L} \to π^{0} γ γ$ and expectations for the decays $K_{L} \to π^{0} e^{+} e^{-}$ and $K_{L} \to π^{0} μ^{+} μ^{-}$
Physical Review D, 1993
Unitarity and KL → π0γγ
Physics Letters B, 1993
A measurement of the decay KL→π0γγ
Physics Letters B, 1992
Measurement of the branching ratio of the decayKL→π0γγ
Physical Review D, 1991
Observation of the decay KL→π0γγ
Physics Letters B, 1990
K0 → π0γγ decays in chiral perturbation theory
Physics Letters B, 1987

Measurement of the DecayKL→π0γγ

Abstract

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Measurement of the Decay $K_{L} \to π^{0} γ γ$