作者: Niklas Beisert , Burkhard U. W. Schwab
DOI: 10.1103/PHYSREVLETT.106.231602
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摘要: Recent developments in the determination of planar S-matrix N = 4 Super Yang-Mills are closely related to its Yangian symmetry. Here we provide evidence for a yet unobserved additional symmetry: level-one helicity operator.