Towards the n-point one-loop superstring amplitude III: One-loop correlators 
and their double-copy structure

Mafra, Carlos R.; Schlotterer, Oliver

doi:10.1007/JHEP08(2019)092

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Towards the n-point one-loop superstring amplitude III: One-loop correlators and their double-copy structure

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Schlotterer, Oliver
Quantum Gravity and Unified Theories, AEI Golm, MPI for Gravitational Physics, Max Planck Society;

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Citation

Mafra, C. R., & Schlotterer, O. (2019). Towards the n-point one-loop superstring amplitude III: One-loop correlators and their double-copy structure. Journal of High Energy Physics, 2019(8): 92. doi:10.1007/JHEP08(2019)092.

Cite as: https://hdl.handle.net/21.11116/0000-0002-DC7F-9

Abstract

In this final part of a series of three papers, we will assemble
supersymmetric expressions for one-loop correlators in pure-spinor superspace
that are BRST invariant, local, and single valued. A key driving force in this
construction is the generalization of a so far unnoticed property at
tree-level; the correlators have the symmetry structure akin to {\it Lie
polynomials}. One-loop correlators up to seven points are presented in a
variety of representations manifesting different subsets of their defining
properties. These expressions are related via identities obeyed by the
kinematic superfields and worldsheet functions spelled out in the first two
parts of this series and reflecting a duality between the two kinds of
ingredients.
Interestingly, the expression for the eight-point correlator following from
our method seems to capture correctly all the dependence on the worldsheet
punctures but leaves undetermined the coefficient of the holomorphic Eisenstein
series ${\rm G}_4$. By virtue of chiral splitting, closed-string correlators
follow from the double copy of the open-string results.