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 also non-polynomial in the Ramond string field psi, we can construct them order by order in psi. Their explicit forms with the gauge transformations are given up to the next-to-next-to-leading order in psi. We also determine a subset of the terms to all orders. By introducing an auxiliary Ramond string field Xi, 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.