Paper detail

The Ramond Sector of Heterotic String Field Theory

We attempt to construct the full equations of motion for the Neveu-Schwarz and the Ramond sectors of the heterotic string field theory. Although they are non-polynomial also in the Ramond string field $Ψ$, we can construct them order by order in $Ψ$. Their explicit forms with the gauge transformations are given up to the next-to-next-to-leading order in $Ψ$. We also determine a subset of the terms to all orders. By introducing an auxiliary Ramond string field $Ξ$, we construct a covariant action supplemented with a constraint, which should be imposed on the equations of motion. We propose the Feynman rules and show how they reproduce well-known physical four-point amplitudes with external fermions.