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

Preprint

23 July 2007

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.0707.3439

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

CHIRAL PERTURBATION
PERTURBATION THEORY
MODEL PREDICTION
STANDARD MODEL
TWO LOOP
MATCHING
E/MU

All Related Versions

Version 1, 2007-07-23, ArXiv
Published version: Physical Review Letters, 99 (23), 231801.

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