Ah. Bougourzi et Ra. Weston, A FREE-FIELD REPRESENTATION OF THE SCREENING CURRENTS OF U-Q((SL(3))OVER-CAP), International journal of modern physics A, 10(4), 1995, pp. 561-578
We construct five independent screening currents associated with the U
-q(<sl(3)over cap>) quantum current algebra. The screening currents ar
e expressed as exponentials of the eight basic deformed bosonic fields
that are required in the quantum analog of the Wakimoto realization o
f the current algebra. Four of the screening currents are ''simple,''
in that each one is given as a single exponential field. The fifth is
expressed as an infinite sum of exponential fields. For reasons which
we will discuss, we expect that the structure of the screening current
s for a general quantum affine algebra will be similar to the U-q(<sl(
3)over cap>) case.