Four-Point Amplitude from Open Superstring Field Theory

TL;DR

This paper computes the four-point tree amplitude in open superstring field theory, confirming its consistency with first-quantized results and addressing divergence issues in the action.

Contribution

It introduces a divergence-free superstring field theory action and verifies its four-point amplitude matches established first-quantized calculations.

Findings

Amplitude agrees with first-quantized prescription

Action avoids contact term divergences

Validates the superstring field theory approach

Abstract

An open superstring field theory action has been proposed which does not suffer from contact term divergences. In this paper, we compute the on-shell four-point tree amplitude from this action using the Giddings map. After including contributions from the quartic term in the action, the resulting amplitude agrees with the first-quantized prescription.