S-matrix approach to two-pion production in e^+e^- annihilation and tau decay

Abstract

Based on the S-matrix approach, we introduce a modified formula for the ${\pi }^{\pm }$ electromagnetic form factor which describes very well the experimental data in the energy region $2m_{\pi }\le \sqrt{s}\le 1.1$ GeV. Using the CVC hypothesis we predict $B(\tpp) = (24.75 \pm 0.38)\% $, in excellent agreement with recent experiments.

Latex, 10 pages, submitted to Phys. Rev. D

References in corpus (1)

• Rho-omega Mixing and the Pion Electromagnetic Form-Factor

Cited by in corpus (5)

• An Update of the HLS Estimate of the Muon g-2
• Gauge invariance and finite width effects in radiative two-pion tau lepton decay
• Asymptotic Limits and Structure of the Pion Form Factor
• Masses and widths of the rho(770)
• Isospin breaking corrections in $2\pi$ production in tau decays and $e^{+}{e}^{-}$ annihilation: consequences for the muon $g-2$ and CVC tests