Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-04-22
JHEP 1012:082,2010
Physics
High Energy Physics
High Energy Physics - Theory
23 pages, 3 figures. v3: A major revision of the paper, various points much clarified, appendix added; no change of the main r
Scientific paper
10.1007/JHEP12(2010)082
In this paper we study the scattering amplitudes at strong coupling for the case where the number of gluons is a multiple of four. This is an important missing piece in arXiv:1002.2459. The tricky point for n=4K is that there is some accidental degeneracy in such case. We explain this point in detail and show that a non-trivial monodromy around infinity was developed by the world-sheet coordinate transformation appearing in the computation. It turns out that besides solving the Y system, we also need to calculate T functions to compute the full amplitudes. We show that the T functions can be derived by taking a limit of Y functions of a higher-point case. As a check, we obtain the known result of eight-point in AdS_3 case.
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