Vector form factor of the pion : A model-independent approach
Abstract
We study a model-independent parameterization of the vector pion form factor that arises from the constraints of analyticity and unitarity. Our description should be suitable up to s^(1/2) ~ 1.2 GeV and allows a model-independent determination of the mass of the rho(770) resonance. We analyse the experimental data on tau^- -> pion^- pion^0 nu_tau and e^+ e^- -> pion^+ pion^- in this framework, and its consequences on the low-energy observables worked out by chiral perturbation theory. An evaluation of the two pion contribution to the anomalous magnetic moment of the muon, a_{mu}, and to the fine structure constant, alpha(M_Z^2), is also performed.
Keywords
Cite
@article{arxiv.hep-ph/0209224,
title = {Vector form factor of the pion : A model-independent approach},
author = {A. Pich and J. Portoles},
journal= {arXiv preprint arXiv:hep-ph/0209224},
year = {2009}
}
Comments
5 pages, 2 figures. To appear in the proceedings of the High-Energy Physics International Conference on Quantum Chromodynamics QCD02, Montpellier (France), 2-9 July (2002)