Supersymmetric Dual String Theory (iii).
Abstract
Singleloop amplitudes with three or four external particles are constructed in the supersymmetric dual theory. The threeparticle loops vanish, signifying the absence of coupling constant renormalization. The fourparticle planarloop amplitude has a divergence that can be absorbed into a renormalization of α', the Regge slope, since it is proportional to the derivative of the tree amplitude with respect to α'. Furthermore, we demonstrate that this divergence can be expressed as the emission from a tree of a zeromass closedstring scalar state at zero momentum. There is also a divergence in the nonplanar loop that couples one external SU(n) singlet [the states of the model are SU(n) singlet and adjoint representations] to three other particles. This divergence can be interpreted as a wavefunction renormalization for external singlets. The nonplanar loop with schannel SU(n) singlet quantum numbers is shown to contain poles corresponding to the states of the closedstring sector of the theory (which includes the massless states of simple d = 10 supergravity).
 Publication:

Superstrings: The First 15 Years of Superstring Theory (Reprints + Commentary  in 2 Volumes). Edited by SCHWARZ J H. Published by World Scientific Publishing Co. Pte. Ltd
 Pub Date:
 September 1985
 DOI:
 10.1142/9789814542456_0040
 Bibcode:
 1985ffys.conf..399G