Dispersive representation of the pion vector form factor in τ→ππντ decays

被引：0
作者：
D. Gómez Dumm
P. Roig
机构：
[1] Universidad Nacional de La Plata,IFLP, CONICET, Departamento de Física
[2] Universitat Autònoma de Barcelona,Grup de Física Teòrica, Institut de Física d’Altes Energies
来源：
The European Physical Journal C | 2013年 / 73卷
关键词：
Form Factor; Loop Function; Dispersive Representation; Muon Anomalous Magnetic Moment; Vector Form Factor;
D O I：
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学科分类号：
摘要：
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 τ−→π−π0ντ decays obtained by Belle, leading to a good description of the corresponding spectral function up to a ππ squared invariant mass s≃1.5 GeV2. We determine the ρ(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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