Electromagnetic form factors of light vector mesons
- Centre for the Subatomic Structure of Matter, University of Adelaide, South Australia 5005 (Australia)
- Department of Physics and Supercomputer Computations Research Institute, Florida State University, Tallahassee, Florida 32306-4130 (United States)
The electromagnetic form factors G{sub E}(q{sup 2}), G{sub M}(q{sup 2}), and G{sub Q}(q{sup 2}), charge radii, magnetic and quadrupole moments, and decay widths of the light vector mesons {rho}{sup +},K{sup {asterisk}+}, and K{sup {asterisk}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 {pi} and {ital K} mesons. Calculated static properties of vector mesons include the charge radii and magnetic moments {l_angle}r{sub {rho}+}{sup 2}{r_angle}{sup 1/2}=0.61 fm, {l_angle}r{sub K{sup {asterisk}+}}{sup 2}{r_angle}{sup 1/2}=0.54 fm, and {l_angle}r{sub K{sup {asterisk}0}}{sup 2}{r_angle}={minus}0.048 fm{sup 2} and {mu}{sub {rho}+}=2.69, {mu}{sub K{sup {asterisk}+}}=2.37, and {mu}{sub K{sup {asterisk}0}}={minus}0.40. The calculated static limits of the {rho}-meson form factors are similar to those obtained from light-front quantum mechanical calculations, but begin to differ above q{sup 2}=1 GeV{sup 2} due to the dynamical evolution of the quark propagators in our approach. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 322015
- Journal Information:
- Physical Review, C, Vol. 59, Issue 3; Other Information: PBD: Mar 1999
- Country of Publication:
- United States
- Language:
- English
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