FORM-FACTORS OF THE XXZ MODEL AND THE AFFINE QUANTUM GROUP SYMMETRY

We present new expressions of form factors of the XXZ model which sati sfy Smirnov's three axioms. These new form factors are obtained by app lying the affine quantum group U-q(<(sl(2))over cap>) to the known one s obtained in our previous works. We also find the relations among all the new and known form factors, i.e. all other form factors are obtai ned by applying U-q(<(sl(2))over cap>) to a singlet form factor.