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dc.contributor.authorEl-Bennich, B. [UNESP]
dc.contributor.authorde Melo, J. P B C
dc.contributor.authorFrederico, T.
dc.identifier.citationFew-Body Systems, v. 54, n. 11, p. 1851-1863, 2013.
dc.description.abstractWe study consistently the pion's static observables and the elastic and γ* γ → π0 transition form factors within a light-front model. Consistency requires that all calculations are performed within a given model with the same and single adjusted length or mass-scale parameter of the associated pion bound-state wave function. Our results agree well with all extent data including recent Belle data on the γ* γ → π0 form factor at large q2, yet the BaBar data on this transition form factor resists a sensible comparison. We relax the initial constraint on the bound-state wave function and show the BaBar data can partially be accommodated. This, however, comes at the cost of a hard elastic form factor not in agreement with experiment. Moreover, the pion charge radius is about 40 % smaller than its experimentally determined value. It is argued that a decreasing charge radius produces an ever harder form factor with a bound-state amplitude difficultly reconcilable with soft QCD. We also discuss why vector dominance type models for the photon-quark vertex, based on analyticity and crossing symmetry, are unlikely to reproduce the litigious transition form factor data. © 2013 Springer-Verlag Wien.en
dc.relation.ispartofFew-Body Systems
dc.titleA Combined Study of the Pion's Static Properties and form Factorsen
dc.contributor.institutionUniversidade Cruzeiro do Sul
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionInstituto Tecnológico de Aeronáutica
dc.description.affiliationLaboratorio de Física Teórica e Computacional Universidade Cruzeiro do Sul, 01506-000 São Paulo
dc.description.affiliationInstituto de Física Teórica Universidade Estadual Paulista, 01140-070 São Paulo
dc.description.affiliationDepartamento de Física Instituto Tecnológico de Aeronáutica, CTA 12228-900 Saõ José dos Campos
dc.description.affiliationUnespInstituto de Física Teórica Universidade Estadual Paulista, 01140-070 São Paulo
dc.rights.accessRightsAcesso restrito
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Física Teórica (IFT), São Paulopt[3]
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