Year: 2026
Type: article
Abstract: A bstract We construct the π© = 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 β ( n β1) with uniform little-group weight that imposes the half-collinearity constraint, a piecewise constant stripped amplitude $${\widetilde{A}}_{1\dots n}$$ that is helicity blind and dual conformal invariant, and (super)momentum conservation delta functions. For n = 3, our superamplitude reduces to the known $$\overline{\text{M}\text{H}\text{V} }$$ superamplitude. We prove dual superconformal covariance of the n -point superamplitude, and further analyse the Gr( k, n ) Grassmannian integral at k = 1. Finally, we present the corresponding single-minus superamplitude in π© = 8 supergravity.
Source: Journal of High Energy Physics
Institution: Queen Mary University of London
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W7222758828