Closed string Ramond-Ramond proposed higher derivative interactions on fermionic amplitudes in IIB

TL;DR

This paper computes detailed fermionic scattering amplitudes in IIB superstring theory, revealing new higher derivative interactions, infinite poles, and couplings involving Ramond-Ramond fields, supporting universality in string corrections.

Contribution

It provides the complete form of a specific fermionic amplitude in IIB superstring theory, discovering new vertices, higher derivative corrections, and analyzing infinite poles and couplings, advancing understanding of string interactions.

Findings

Discovered new vertices and higher derivative corrections.

Identified all infinite gauge and scalar poles in the amplitude.

Supported the universality conjecture for higher derivative corrections.

Abstract

The complete form of the amplitude of one closed string Ramond-Ramond (RR), two fermionic strings and one scalar field in IIB superstring theory has been computed in detail. Deriving $<V_{C}V_{\bar\psi}V_{\psi} V_{\phi}>$ by using suitable gauge fixing, we discover some new vertices and their higher derivative corrections. We investigate both infinite gauge and scalar $u-$channel poles of this amplitude. In particular, by using the fact that the kinetic term of fermion fields has no correction, employing Born-Infeld action, the Wess-Zumino terms and their higher derivative corrections, we discover all infinite $t,s-$channel fermion poles. The couplings between one RR and two fermions and all their infinite higher derivative corrections have been explored. In order to look for all infinite $(s+t+u)-$ channel scalar/gauge poles for $p+2=n,p=n$ cases, we obtain the couplings between two fermions-two scalars and two fermions, one scalar and one gauge field as well as all their infinite higher derivative corrections in type IIB. Specifically we make various comments based on arXiv:1205.5079 in favor of universality conjecture for all order higher derivative corrections (with or without low energy expansion) and the relation of open/closed string that is responsible for all superstring scattering amplitudes in IIA,IIB.