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At high center-of-mass energies scattering amplitudes enjoy a hidden integrability. An important example in QCD is Odderon exchange, a composite state of three reggeized gluons, with can be understood as a closed spin chain with periodic boundary conditions. In the $$N = 4$$ supersymmetric Yang–Mills theory a similar open spin chain appears for the planar eight-point amplitude. We solve these two...
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