Non-planar massless two-loop Feynman diagrams with four on-shell legs

Abstract

The non-planar Feynman diagram with seven massless, scalar propagators and four on-shell legs (the crossed double box) is calculated analytically in dimensional regularization. The non-planar diagram with six propagators is also discussed.

Comments: Latex, 10 pages; 5 .eps files included with graphicx package