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Factorization and Unitarity in Superstring Theory

Zhi-Guang Xiao, Chuan-Jie Zhu

hep-tharXiv:hep-th/0503248

Abstract

The overall coefficient of the two-loop 4-particle amplitude in superstring theory is determined by making use of the factorization and unitarity. To accomplish this we computed in detail all the relevant tree and one-loop amplitudes involved and determined their overall coefficients in a consistent way.

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