Abstract
We derive a recursive formula for the expansion of superstring tree amplitudes involving any number of massless open string states. String corrections to Yang-Mills field theory are shown to enter through the Drinfeld associator, a generating series for multiple zeta values. Our results apply to any number of spacetime dimensions or supersymmetries and chosen helicity configurations.
- Received 10 July 2013
DOI:https://doi.org/10.1103/PhysRevD.89.066014
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