Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-01-17
Phys.Rev.D63:093005,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
1+15 pages, 2 figures
Scientific paper
10.1103/PhysRevD.63.093005
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 sqrt(s) ~ 1.2 GeV and allows a model-independent determination of the mass of the rho(770) resonance, M(rho) = (775.1 +- 0.5) MeV. We analyse the experimental data on tau(-) -> pion(-) pion(0) neutrino(tau), 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_muon, and to the fine structure constant, alpha(M(Z)^2), is also performed.
Pich Antonio
Portoles Jorge
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