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Yang, Gang
The journal of high energy physics, 03/2011, Letnik: 2011, Številka: 3Journal Article
Collinear limit usually provides strong constraints for scattering amplitudes. At strong coupling, collinear limit of the amplitudes in SYM is related to the large mass limit of the corresponding Y system. In this paper, we consider a special case in which all mass parameters are taken to be large, which corresponds to a multi-double-collinear limit in which a n -side polygon becomes pentagons. This limit provides a useful constraint for the amplitudes, in particular can be used to fix the periods part for the case of 4 K gluons, which is the last missing piece of full amplitudes.
