Symmetries and Feynman Rules for Ramond Sector in Open Superstring Field Theory

TL;DR

This paper investigates the symmetries of the WZW-type open superstring field theory's action with constraints, proposing new Feynman rules for the Ramond sector that accurately reproduce known amplitudes.

Contribution

It introduces a novel prescription for Feynman rules in the Ramond sector respecting additional symmetries of the constrained action.

Findings

New Feynman rules reproduce known four- and five-point amplitudes.

Additional symmetries are identified when constraints are imposed after transformations.

The approach enhances understanding of symmetries in superstring field theory.

Abstract

We examine the symmetries of the action suppelemented by the constraint in the WZW-type open superstring field theory. It is found that this pseudo-action has additional symmetries provided we impose the constraint after the transformation. Respecting these additional symmetries, we propose a prescription for the new Feynman rules for the Ramond sector. It is shown that the new rules reproduce the well-known on-shell four- and five-point amplitudes with external fermions.