Higher-derivative couplings in string theory: Five-point contact terms

We compute the tree-level (HR3)-R-2 couplings of type II strings and provide some basic tests of the couplings by considering both K3 and Calabi-Yau threefold compactifications. Curiously, additional kinematical structures show up at tree level that are not present in the one-loop couplings. This has interesting implications for type II supersymmetry as well as SL(2, Z) duality in type IIB strings. (C) 2021 The Authors. Published by Elsevier B.V.

Automated summary

We computed the tree-level (HR3)-R-2 couplings of type II strings and found additional kinematical structures at tree level that are not present in the one-loop couplings. This has interesting implications for type II supersymmetry as well as SL(2, Z) duality in type IIB strings.