Bethe ansatz and exact form factors of the O(6) Gross Neveu-model

The isomorphism SU(4)≃ O(6) is used to construct the form factors of the O(6) Gross-Neveu model as bound state form factors of the SU(4) chiral Gross-Neveu model. This technique is generalized and is then applied to use the O(6) as the starting point of the nesting procedure to obtain the O(N) form factors for general even N.

Dedicated to the memory of Petr Petrovich Kulish.