  The electroweak properties of light and charmed D and Ds pseudoscalar mesons
are investigated within a unified covariant constituent quark model. The
quark-antiquark-meson vertices are assumed to have a symmetric form by the
exchange of quark momenta, which is successful in describing the light
pseudoscalar meson properties. The flavor decomposition of the elastic
electromagnetic form factors, electromagnetic charge radii, and weak decay
constants are calculated. Based on the results a discussion on the SU(3) and
SU(4) symmetry breaking is made and a comparison with the pion and kaon
properties to highlight the Higgs contribution to the structure of these
mesons.
