Automatic construction of dipole subtraction

An automatization of the dipole subtraction method is reported. We have completed three essential steps: the creation of the dipole terms, the calculation of the color linked squared Born matrix elements, and the evaluation of different helicity amplitudes. The routines have been tested for a number of complex processes. For example we have compared the output of our program for gg→tt-bar gg with the results of Refs. [S. Dittmaier, P. Uwer and S. Weinzierl, Phys. Rev. Lett. 98, 262002 (2007), S. Dittmaier, P. Uwer and S. Weinzierl, arXiv:0810.0452 [hep-ph]] and found complete agreement