Lightest pseudoscalar exchange contribution to light-by-light scattering piece of the muon g-2
Abstract
Lightest pseudoscalar (P= pi^0, eta, eta') exchange contribution to the light-by-light (LbL) scattering piece of the muon anomaly, a_mu=(g_mu-2)/2, has been evaluated using a resonance chiral Lagrangian (R\chi L). Best description of pion transition form-factor (TFF) data is obtained with only tiny violations of one of the relations in the minimal consistent set of short-distance constraints on the anomalous R\chi L couplings. eta^{(')} TFF, predicted in terms of the pi TFF and the eta-eta^' mixing, are in good agreement with measurements. With this input, we obtain a_mu^{P,LbL} = (10.47\pm0.54)x10^-10, consistent with the reference determinations in the literature, albeit with smaller error.
Keywords
Cite
@article{arxiv.1409.2174,
title = {Lightest pseudoscalar exchange contribution to light-by-light scattering piece of the muon g-2},
author = {Pablo Roig and Adolfo Guevara and Gabriel López Castro},
journal= {arXiv preprint arXiv:1409.2174},
year = {2014}
}
Comments
3 pages, 3 figures. Contribution to the Proceedings of the ICHEP 2014 Conference. To be published in Nucl. Phys. B Proc. Suppl