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From maximal to minimal supersymmetry in string loop amplitudes

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

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1603.05262.pdf
(Preprint), 2MB

JHEP04(2017)163.pdf
(Publisher version), 964KB

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Citation

Berg, M., Buchberger, I., & Schlotterer, O. (2017). From maximal to minimal supersymmetry in string loop amplitudes. Journal of high energy physics: JHEP, 2017(04): 163. doi:10.1007/JHEP04(2017)163.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002A-3BE4-4
Abstract
We calculate one-loop string amplitudes of open and closed strings with N=1,2,4 supersymmetry in four and six dimensions, by compactification on Calabi-Yau and K3 orbifolds. In particular, we develop a method to combine contributions from all spin structures for arbitrary number of legs at minimal supersymmetry. Each amplitude is cast into a compact form by reorganizing the kinematic building blocks and casting the worldsheet integrals in a basis. Infrared regularization plays an important role to exhibit the expected factorization limits. We comment on implications for the one-loop string effective action.