Vector form factor of the pion : A model-independent approach

✍ Scribed by A. Pich; J. Portolés

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 366 KB
• Volume: 121
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/s0920-5632(03)01841-3

✦ Synopsis

We study a model-independent parameterization of the vector pion form factor that arises from the constraints of anaiyticity and unitarity. Our description should be suitable up to fi ci 1.2 GeV and allows a modelindependent determination of the mass of the ~(770) resonance.

We analyse the experimental data on T-+ T-TOY and e+e--+ T'T-in this framework, and its consequences on the low-energy observables worked out by chirTti perturbation theory. An evaluation of the two pion contribution to the anomalous magnetic moment of the muon, CQ, and to the fine structure constant, cr(Mi), is also performed.