The paper “Infinite dimensional R-matrices for the relativistic scattering of massless modes on AdS_2“, co-authored by Juan Miguel Nieto García (formerly a postdoc at Surrey, now at Hamburg University), Roberto Ruiz (Madrid University), and Alessandro Torrielli, has been accepted for publication in the Journal of High Energy Physics. In the paper they construct infinite-dimensional R-matrices that generalise the relativistic scattering of massless modes with the same chirality on AdS2 near the Berestein-Maldacena-Nastase vacuum. Full details can be found in the final-form arXiv version (link here). The screenshot below shows key equations from Section 2.