The Overall Coefficient of the Two-loop Superstring Amplitude Using Pure Spinors

Details The Overall Coefficient of the Two-loop Superstring Amplitude Using Pure Spinors The Overall Coefficient of the Two-loop Superstring Amplitude Using Pure Spinors

2010-03-02

arxiv.org/abs/1003.0678v2

Physics

High Energy Physics

High Energy Physics - Theory

29 pages, harvmac TeX. v2: add references

Scientific paper

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 formulae 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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