The Standard Model prediction for R_{e/mu}^{(pi,K)}

Details The Standard Model prediction for R_{e/mu}^{(pi,K)} The Standard Model prediction for R_{e/mu}^{(pi,K)}

2007-07-23

arxiv.org/abs/0707.3439v1

Phys.Rev.Lett.99:231801,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 figure, 2 tables

Scientific paper

10.1103/PhysRevLett.99.231801

We study the ratios R_{e/mu}^{(P)} = Gamma(P -> e nu [gamma])/Gamma(P -> mu
nu [gamma]) (P=pi,K) in Chiral Perturbation Theory to order e^2 p^4. We
complement the two-loop effective theory results with a matching calculation of
the counterterm, finding R_{e/mu}^{(pi)} = (1.2352 \pm 0.0001)*10^(-4) and
R_{e/mu}^{(K)} = (2.477 \pm 0.001)*10^(-5).

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