Scalar mesons and the muon anomaly
Abstract
We evaluate systematically some new contributions of the QCD scalar mesons, including radiative decay-productions, not considered with a better attention until now in the evaluation of the hadronic contributions to the muon anomaly. The sum of the scalar contributions to be added to the existing Standard Model predictions a_mu^{SM} are estimated in units 10^{-10} to be a^{S}_mu= 1.0(0.6) [TH based]} and 13(11) [ PDG based], where the errors are dominated by the ones from the experimental widths of these scalar mesons. PDG based results suggest that the value of a_mu^{SM} and its errors might have been underestimated in previous works. The inclusion of these new effects leads to a perfect agreement (< 1.1\sigma) of the measured value a^{exp}_mu and a_mu^{SM} from tau-decay and implies a (1.5 ~ 3.3) sigma discrepancy between a^{exp}_mu and a_mu^{SM} from e^+e^- into hadrons data. More refined unbiased estimates of a_mu^{SM} require improved measurements of the scalar meson masses and widths. The impact of our results to a_mu^{SM} is summarized in the conclusions.
Keywords
Cite
@article{arxiv.hep-ph/0303004,
title = {Scalar mesons and the muon anomaly},
author = {Stephan Narison},
journal= {arXiv preprint arXiv:hep-ph/0303004},
year = {2009}
}
Comments
Latex file, 5 pages, 2 tables, 1 eps figure. Version to appear in Phys. Lett. B. Separation of the pure theoretical based and experimental PDG based estimates of a_mu^SM