Twistor-Strings, Grassmannians and Leading Singularities by Bullimore, M, Mason, L, Skinner, D

“…We go on to show that the genus g twistor-string moduli space for g-loop N^{k-2}MHV amplitudes may be mapped into the Grassmannian G(k,n). Restricting to a leading singularity, the image of this map is a 2(n-2)-dimensional subcycle of G(k,n) of exactly the type found from the Grassmannian residue formula of Arkani-Hamed, Cachazo, Cheung and Kaplan. …”

Twistor-strings, Grassmannians and leading singularities by Bullimore, M, Mason, L, Skinner, D

Scattering Amplitudes and Wilson Loops in Twistor Space by Adamo, T, Bullimore, M, Mason, L, Skinner, D

“…We give a brief review of other ideas in connection with amplitudes in twistor space: twistor-strings, recursion in twistor space, the Grassmannian residue formula for leading singularities and amplitudes as polytopes. …”