The overall coefficient of the two-loop superstring amplitude using pure spinors
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Springer Nature
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Acesso aberto
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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. © SISSA 2010.
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English
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Journal of High Energy Physics, v. 2010, n. 5, 2010.
