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In this paper we derive a class of contributions to all orders in $\alpha'$to the effective action of D-brane-anti D-brane systems in Type II StringTheory, considering an amplitude involving a closed-string Ramond-Ramond stateand four open-string states: two tachyons, a scalar and a gauge boson. Thistype of amplitude arises in both Type IIA and Type IIB strings, and reveals anumber of new effective couplings. Furthermore, we derive a seriesrepresentation for the result that goes beyond a factorized limit that wasrecently studied, and which is expected to apply to more general six-pointamplitudes of superstrings, including external fermions.

On All-Order Higher-Point $\text{D}p$-$\overline{\text{D}p}$ Effective Actions