arxiv: hep-ph/0212267 · v1 · submitted 2002-12-18 · ✦ hep-ph · nucl-th

Frame Dependence of the Pair Contribution to the Pion Electromagnetic Form Factor in a Light-Front Approach

J. P. B. C. de Melo (1) , T. Frederico (2) , E. Pace (3) , G. Salme (4) ((1) Instituto de Fisica Teorica , UNESP , Sao Paulo , SP , Brazil

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(2) Dep. de Fisica ITA CTA Sao Jose dos Campos (3) Dipartimento di Fisica Universita di Roma "Tor Vergata" Istituto Nazionale di Fisica Nucleare Sezione Tor Vergata Roma Italy (4) Istituto Nazionale di Fisica Nucleare Italy)

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classification ✦ hep-ph nucl-th

keywords pionapproachcontributiondependenceelectromagneticfactorformframe

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The frame dependence of the pair-term contribution to the electromagnetic form factor of the pion is studied within the Light Front approach. A symmetric ansatz for the pion Bethe-Salpeter amplitude with a pseudo scalar coupling of the constituent to the pion field is used. In this model, the pair term vanishes for the Drell-Yan condition, while it is dominant for momentum transfer along the light-front direction.

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Frame Dependence of the Pair Contribution to the Pion Electromagnetic Form Factor in a Light-Front Approach

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