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Space-like and time-like pion electromagnetic form factor and Fock state components within the Light-Front dynamics

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arxiv hep-ph/0508001 v1 submitted 2005-07-29 hep-ph hep-exnucl-exnucl-th

J. P. B. C. de Melo (Centro de Ciências Exatas e Tecnológicas , Universidade Cruzeiro do Sul , Sao Paulo , SP. , Instituto de Fisica Teorica , Universidade Estadual Paulista , SP , Brazil)
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T. Frederico (Dep. de Fisica Instituto Tecnologico da Aeronautica Centro Tecnico Aeroespacial Sao Jose dos Campos Brazil) E. Pace (Dipartimento di Fisica Universita di Roma "Tor Vergata" Istituto Nazionale di Fisica Nucleare Sezione Tor Vergata Via della Ricerca Scientifica 1 Roma Italy) G. Salme (Istituto Nazionale di Fisica Nucleare Sezione Roma I P.le A. Moro 2
This is my paper · ORCID
classification hep-phhep-exnucl-exnucl-th
keywords pionmodeltime-likecomponentselectromagneticfactorformlight-front
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abstract

The simultaneous investigation of the pion electromagnetic form factor in the space- and time-like regions within a light-front model allows one to address the issue of non-valence components of the pion and photon wave functions. Our relativistic approach is based on a microscopic vector meson dominance (VMD) 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 time-like region the model produces reasonable results up to 10 $(GeV/c)^2$.

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Cited by 1 Pith paper

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  1. Covariant analysis of electromagnetic current on the light cone: exposition with scalar Yukawa theory

    hep-ph 2025-01 conditional novelty 6.0 of 10

    Adding an antinucleon Fock component, even at only ~2% probability, dramatically reduces the frame dependence of the charge form factor in strongly coupled scalar Yukawa theory on the light front.

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