Six Open String Disk Amplitude in Pure Spinor Superspace

Understand

The tree-level amplitude of six massless open strings is computed using the pure spinor formalism.

• The OPE poles among integrated and unintegrated vertices can be efficiently organized according to the cohomology of pure spinor superspace.
• The identification and use of these BRST structures and their interplay with the system of equations fulfilled by the generalized Euler integrals allow the full supersymmetric six-point amplitude to be written in compact form.
• Furthermore, the complete set of extended Bern-Carrasco-Johansson relations are derived from the monodromy properties of the disk world-sheet and explicitly verified for the supersymmetric numerator factors.