We address the near-collinear expansion of multiparticle NMHV amplitudes, namely, the heptagon and octagons in the dual language of null polygonal super Wilson loops. In particular, we verify multiparticle factorization of charged pentagon transitions in terms of pentagons for single flux-tube excitations within the framework of refined operator product expansion. We find a perfect agreement with available tree and one-loop data.
Belitsky, A. (2015). On factorization of multiparticle pentagons. Nuclear Physics B, 897, 346-373. doi:10.1016/j.nuclphysb.2015.05.024
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