Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-11-16
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, revtex, 2 figures
Scientific paper
The space-like electromagnetic form factor is expressed in terms of the overlap integral of the initial and final meson wave functions written as Lorentz covariant distributions of internal momenta. The meson constituents are assumed to be valence quarks and an effective vacuum-like field. The momentum of the latter represents a relativistic generalization of the potential energy of the quark system. The calculation is fully Lorentz covariant and the form factors of the charged mesons are normalized to unity at t=0. The numerical results have been obtained by freezing the transverse degrees of freedom. We found r_\pi^2=0.434 fm^2, r_{K^+}^2=0.333 fm^2, r_{K^0}^2=-0.069 fm^2 by taking m_{u,d}=430 MeV, m_s=700 MeV.
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