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We explicitly compute the (NS) sector conventional type-I superstringtree-level amplitudes at five points after compactifying to 4-D, express theQFT building block in the helicity basis, and give several attempts towardsarbitrary $n$ points. More specifically, we consider the interaction of onefirst excited level and otherwise massless states of conventional type-Isuperstrings, where the four-dimensional states can, for instance, be realizedvia D$3$ branes. We construct the amplitude by using the Berends-Gielecurrents. From the recursion of Berends-Giele currents, we can generate thehigher point amplitude. We also apply the BCFW recursion with massive externallegs shifted and get the amplitude for arbitrary $n$ points.

Higher-Point Gauge-Theory Couplings of Massive Spin-2 States in 4-Dimensional String Theories