The string model with $N=2\mathrm{}$ world-sheet supersymmetry is approached via ghosts, Becchi-Rouet-Stora-Tyutin cohomology, and bosonization. Some amplitudes involving massless scalars and vectors are computed at the tree level. The constraints of locality on the spectrum are analyzed. An attempt is made to "decompactify" the model into a four-dimensional theory.

• Received 3 October 1988

DOI:https://doi.org/10.1103/PhysRevD.40.408