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- W4300696413 abstract "We have calculated the ratios $R_{e/mu}^{(P)} equiv Gamma(P to e bar{nu}_e [gamma])/ Gamma(P to mu bar{nu}_mu [gamma])$ ($P=pi,K$) in Chiral Perturbation Theory up to $mathcal{O}(e^2p^4)$, finding $R_{e/mu}^{(pi)} = (1.2352 pm 0.0001) times 10^{-4}$ and $R_{e/mu}^{(K)} = (2.477 pm 0.001) times 10^{-5}$. This observable is helicity suppressed in the Standard Model, so that it is a sensitive probe of all Standard Model extensions that induce pseudoscalar currents and nonuniversal corrections to the lepton couplings. Ongoing experimental searches plan to reach uncertainties that are comparable to these results. At the moment $R_{e/mu}^{(K)}$ is in agreement with the final result by the KLOE Collaboration at DAFNE and it is at $1.4 sigma$ of the preliminary result by the NA62 Experiment at CERN. New measurements of $R_{e/mu}^{(pi)}$ are under way by the PEN Collaboration at PSI and by the PIENU Collaboration at TRIUMF." @default.
- W4300696413 created "2022-10-04" @default.
- W4300696413 creator A5020015572 @default.
- W4300696413 date "2009-10-13" @default.
- W4300696413 modified "2023-10-06" @default.
- W4300696413 title "The Standard model prediction for K(e2)/K_(mu2) and pi(e2)/pi(mu2)" @default.
- W4300696413 doi "https://doi.org/10.48550/arxiv.0910.2347" @default.
- W4300696413 hasPublicationYear "2009" @default.
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