Abstract
We introduce a method to extract the symbol of the coefficient of (2πi)2 of MHV remainder functions in planar \( \mathcal{N} \) = 4 Super Yang-Mills in multi-Regge kinematics region directly from the symbol in full kinematics. At two loops this symbol can be uplifted to the full function in a unique way, without any beyond-the-symbol ambiguities. We can therefore determine all two-loop MHV amplitudes at function level in all kinematic regions with different energy signs in multi-Regge kinematics. We analyse our results and we observe that they are consistent with the hypothesis of a contribution from the exchange of a three-Reggeon composite state starting from two loops and eight points in certain kinematic regions.
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ArXiv ePrint: 1811.10398
On leave from INFN, Laboratori Nazionali di Frascati, Italy. (Vittorio Del Duca)
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Del Duca, V., Duhr, C., Dulat, F. et al. All two-loop MHV remainder functions in multi-Regge kinematics. J. High Energ. Phys. 2019, 162 (2019). https://doi.org/10.1007/JHEP01(2019)162
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DOI: https://doi.org/10.1007/JHEP01(2019)162