Hamiltonian Reduction of WZNW Model Associated With Chiral Constraints

The constant constraints in the conventional Hamiltonian reductions ofWZNW model are generalized to the case of arbitrary chiral constraints.It is shown thatthe reduced model is equivalent to a conformal integrable system at both classical andquantum levels.It is also found that the use of chiral constraints is equivalent to theHamihonian reduction of the product phase space of WZNW model and free fields.