Analytic Structure of Three-Mass Triangle Coefficients

Authors :: Bjerrum-Bohr, N. E. J.
Dunbar, David C.
Perkins, Warren B.
Source :: JHEP0804:038,2008
Publication Year :: 2007
Abstract: ``Three-mass triangles'' are a class of integral functions appearing in one-loop gauge theory amplitudes. We discuss how the complex analytic properties and singularity structures of these amplitudes can be combined with generalised unitarity techniques to produce compact expressions for three-mass triangle coefficients. We present formulae for the N=1 contributions to the n-point NMHV amplitude.<br />Comment: 22 pages; v3: NMHV n=point expression added. 7 point expression removed