Electromagnetic form factors of light vector mesons

The electromagnetic form factors GE(q²), GM(q²), and GQ(q²), charge radii, magnetic and quadrupole moments, and decay widths of the light vector mesons ρ⁺,K*+, and K*0 are calculated in a Lorentz-covariant, Dyson-Schwinger-equation-based model using algebraic quark propagators that incorporate confinement, asymptotic freedom, and dynamical chiral symmetry breaking, and vector-meson Bethe-Salpeter amplitudes closely related to the pseudoscalar amplitudes obtained from phenomenological studies of π and K mesons. Calculated static properties of vector mesons include the charge radii and magnetic moments 〈r_ρ+²〉1/2=0.61 fm, 〈r_K*+²〉1/2=0.54 fm, and 〈r_K*0²〉=-0.048 fm² and μ_ρ+=2.69, μ_K*+=2.37, and μ_K*0=-0.40. The calculated static limits of the ρ-meson form factors are similar to those obtained from light-front quantum mechanical calculations, but begin to differ above q²=1 GeV² due to the dynamical evolution of the quark propagators in our approach.