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

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

1995-10-27

arxiv.org/abs/hep-ph/9510435v1

Phys.Rev. D53 (1996) 4089-4091

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1103/PhysRevD.53.4089

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 $2m_{\pi} \leq \sqrt{s} \leq 1.1$ GeV.
Using the CVC hypothesis we predict $B(\tpp) = (24.75 \pm 0.38)\% $, in
excellent agreement with recent experiments.

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