The Standard Model prediction for R_{e/mu}^{(pi,K)}
High Energy Physics - Phenomenology
2008-11-26 v1
Abstract
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).
Keywords
Cite
@article{arxiv.0707.3439,
title = {The Standard Model prediction for R_{e/mu}^{(pi,K)}},
author = {Vincenzo Cirigliano and Ignasi Rosell},
journal= {arXiv preprint arXiv:0707.3439},
year = {2008}
}
Comments
4 pages, 1 figure, 2 tables