期刊
EUROPEAN PHYSICAL JOURNAL C
卷 73, 期 8, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-013-2528-1
关键词
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资金
- Spanish grants [FPA2007-60323, FPA2011-25948]
- Consolider Ingenio Programme CPAN [CSD2007-00042]
- CONICET [PIP02495]
- ANPCyT (Argentina) [PICT-2011-0113]
We propose a dispersive representation of the charged pion vector form factor that is consistent with chiral symmetry and fulfills the constraints imposed by analyticity and unitarity. Unknown parameters are fitted to the very precise data on tau(-) -> pi(-)pi(0)nu(tau) decays obtained by Belle, leading to a good description of the corresponding spectral function up to a pi pi squared invariant mass s similar or equal to 1.5 GeV2. We determine the rho(770) mass and width pole parameters and obtain the values of low-energy observables. The significance of isospin-breaking corrections is also discussed. For larger values of s, this representation is complemented with a phenomenological description to allow its implementation in the new TAUOLA hadronic currents.
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