The Rare Decays $\piee$, $\etaee$ and \etamumu$ in Chiral Perturbation Theory

Details The Rare Decays $\piee$, $\etaee$ and \etamumu$ in Chiral Perturbation Theory The Rare Decays $\piee$, $\etaee$ and \etamumu$ in Chiral Perturbation Theory

1992-07-10

arxiv.org/abs/hep-ph/9207233v1

Phys.Lett. B291 (1992) 481-483

Physics

High Energy Physics

High Energy Physics - Phenomenology

(6 pages, 1 figure available on request, uses harvmac.tex), UCSD/PTH 92-23, CALT-68-1803

Scientific paper

10.1016/0370-2693(92)91407-Z

We calculate the decay rates for $\piee$, $\etaee$ and $\etamumu$ in chiral
perturbation theory. The linear combination of counterterms necessary to render
these amplitudes finite is fixed by the recently measured branching fraction
for $\etamumu$. We find $\Br(\piee ) = 7\pm 1\times 10^{-8}$ and $\Br(\etaee
)=5\pm 1\times 10^{-9}$.

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