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arXiv 1504.06323hep-thhep-phmath-phmath.MP
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双圈扩张算子和有限余项的在壳方法

On-Shell Methods for the Two-Loop Dilatation Operator and Finite Remainders

Florian Loebbert, Dhritiman Nandan, Christoph Sieg, Matthias Wilhelm, Gang Yang

摘要:

利用在壳幺正性方法计算了平面N=4 SYM理论SU(2)扇区中所有算子的双圈极小形状因子.从这个结果的UV发散,我们得到了该部门的双圈膨胀算子。此外,我们还计算了相应的有限余函数。由于算子破缺了超对称性,剩余函数不具有一致超越性。然而,领先的超越性部分原来是普遍的,是相同的相应的BPS表达式。余项函数满足线性关系,这些线性关系可以用R对称性下的形状因子的沃德恒等式来解释。

英文摘要:

We compute the two-loop minimal form factors of all operators in the SU(2) sector of planar N=4 SYM theory via on-shell unitarity methods. From the UV divergence of this result, we obtain the two-loop dilatation operator in this sector. Furthermore, we calculate the corresponding finite remainder functions. Since the operators break the supersymmetry, the remainder functions do not have the property of uniform transcendentality. However, the leading transcendentality part turns out to be universal and is identical to the corresponding BPS expressions. The remainder functions are shown to satisfy linear relations which can be explained by Ward identities of form factors following from R-symmetry.

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