Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-07-25
JHEP0611:079,2006
Physics
High Energy Physics
High Energy Physics - Theory
20 pages, harvmac tex
Scientific paper
10.1088/1126-6708/2006/11/079
We use the non-minimal pure spinor formalism to compute in a super-Poincare covariant manner the four-point massless one and two-loop open superstring amplitudes, and the gauge anomaly of the six-point one-loop amplitude. All of these amplitudes are expressed as integrals of ten-dimensional superfields in a "pure spinor superspace" which involves five $\theta$ coordinates covariantly contracted with three pure spinors. The bosonic contribution to these amplitudes agrees with the standard results, and we demonstrate identities which show how the $t_8$ and $\epsilon_{10}$ tensors naturally emerge from integrals over pure spinor superspace.
Berkovits Nathan
Mafra Carlos R.
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