Abstract
We show that scattering amplitudes in planar \( \mathcal{N}=4 \) Super Yang-Mills in multi-Regge kinematics can naturally be expressed in terms of single-valued iterated integrals on the moduli space of Riemann spheres with marked points. As a consequence, scattering amplitudes in this limit can be expressed as convolutions that can easily be computed using Stokes’ theorem. We apply this framework to MHV amplitudes to leading-logarithmic accuracy (LLA), and we prove that at L loops all MHV amplitudes are determined by amplitudes with up to L + 4 external legs. We also investigate non-MHV amplitudes, and we show that they can be obtained by convoluting the MHV results with a certain helicity flip kernel. We classify all leading singularities that appear at LLA in the Regge limit for arbitrary helicity configurations and any number of external legs. Finally, we use our new framework to obtain explicit analytic results at LLA for all MHV amplitudes up to five loops and all non-MHV amplitudes with up to eight external legs and four loops.
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ArXiv ePrint: 1606.08807
On leave from Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, Italy. (Vittorio Del Duca)
On leave from the "Fonds National de la Recherche Scientifique" (FNRS), Belgium. (Claude Duhr)
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Del Duca, V., Druc, S., Drummond, J. et al. Multi-Regge kinematics and the moduli space of Riemann spheres with marked points. J. High Energ. Phys. 2016, 152 (2016). https://doi.org/10.1007/JHEP08(2016)152
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DOI: https://doi.org/10.1007/JHEP08(2016)152