We compute the two-loop helicity amplitudes for the scattering of five gluons, including all
contributions beyond the leading-color approximation. The analytic expressions are …

A bstract We study scattering amplitudes in massless non-abelian gauge theory where all
outgoing gluons have positive helicity. It has been argued recently by Costello that for a …

A bstract We characterise possible identities among the two-loop partial amplitudes of gluon
scattering in Yang-Mills theory. We use known amplitudes in an exhaustive search to identify …

There is a special set of massless four-dimensional gauge theories which admit local and
gauge-anomaly-free uplifts to twistor space; we call such theories twistorial. In twistorial …

A bstract In the decomposition of gauge-theory amplitudes into kinematic and color factors,
the color factors (at a given loop order L) span a proper subspace of the extended trace …