Spacelike and timelike pion electromagnetic form factor and Fock state components within the light-front dynamics

• Autor(a) principal: De Melo, J. P.B.C. [UNESP]
• Data de Publicação: 2006
• Outros Autores: Frederico, T., Pace, E., Salmè, G.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1103/PhysRevD.73.074013; http://hdl.handle.net/11449/224740

The simultaneous investigation of the pion electromagnetic form factor in the space- and timelike regions within a light-front model allows one to address the issue of nonvalence components of the pion and photon wave functions. Our relativistic approach is based on a microscopic vector-meson-dominance model for the dressed vertex where a photon decays in a quark-antiquark pair, and on a simple parametrization for the emission or absorption of a pion by a quark. The results show an excellent agreement in the space like region up to -10(GeV/c)2, while in timelike region the model produces reasonable results up to 10(GeV/c)2. © 2006 The American Physical Society.