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Abstract: The pure spinor formulation of the ten-dimensional superstring leads tomanifestly supersymmetric loop amplitudes, expressed as integrals in purespinor superspace. This paper explores different methods to evaluate theseintegrals and then uses them to calculate the kinematic factors of the one-loopand two-loop massless four-point amplitudes involving two and four Ramondstates.



Autor: Christian Stahn

Fuente: https://arxiv.org/







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