NUCLEON AND PION ELECTROMAGNETIC FORM-FACTORS IN A LIGHT-FRONT CONSTITUENT QUARK-MODEL

Nucleon and pion electromagnetic form factors are evaluated in the spa celike region within a light-front constituent quark model, where eige nfunctions of a mass operator, reproducing a large set of hadron energ y levels, are adopted and quark form factors are considered in the one -body current. The hadron form factors are sharply affected by the hig h momentum tail generated in the wave function by the one-gluon-exchan ge interaction. Useful information on the electromagnetic structure of light constituent quarks can be obtained from the comparison with nuc leon and pion experimental data.