$\mathcal{N}=4$ single-minus superamplitudes and dual superconformal symmetry

We construct the $\mathcal{N}=4$ supersymmetric completion of the recently proposed single-minus gluon amplitudes in $(2,2)$ signature, which are nonvanishing for all multiplicities on a half-collinear kinematic locus. The superamplitude factorises into a permutation-invariant measure $Δ^{(n-1)}$ wi