Abstract
Using the results recently obtained for computing integrals over (non-minimal) pure spinor superspace, we compute the coefficient of the massless two-loop four-point amplitude from first principles. Contrasting with the mathematical difficulties in the RNS formalism where unknown normalizations of chiral determinant formulæ force the two-loop coefficient to be determined only indirectly through factorization, the computation in the pure spinor formalism can be smoothly carried out.
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Gomez, H., Mafra, C.R. The overall coefficient of the two-loop superstring amplitude using pure spinors. J. High Energ. Phys. 2010, 17 (2010). https://doi.org/10.1007/JHEP05(2010)017
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DOI: https://doi.org/10.1007/JHEP05(2010)017