Electromagnetic form factor of the pion in the space- and time-like regions within the front-form dynamics

Details Electromagnetic form factor of the pion in the space- and time-like regions within the front-form dynamics Electromagnetic form factor of the pion in the space- and time-like regions within the front-form dynamics

2003-11-28

arxiv.org/abs/hep-ph/0311369v1

Phys.Lett. B581 (2004) 75-81

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages + 4 figures. To appear in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2003.11.072

The pion electromagnetic form factor is calculated in the space- and time-like regions from -10 $(GeV/c)^2$ up to 10 $(GeV/c)^2$, within a front-form model. The dressed photon vertex where a photon decays in a quark-antiquark pair is depicted generalizing the vector meson dominance ansatz, by means of the vector meson vertex functions. An important feature of our model is the description of the on-mass-shell vertex functions in the valence sector, for the pion and the vector mesons, through the front-form wave functions obtained within a realistic quark model. The theoretical results show an excellent agreement with the data in the space-like region, while in the time-like region the description is quite encouraging.

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