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arXiv 1303.6909hep-thhep-ph
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引导奇点与离壳共形积分

Leading singularities and off-shell conformal integrals

James Drummond, Claude Duhr, Burkhard Eden, Paul Heslop, Jeffrey Pennington, Vladimir A. Smirnov

摘要:

在N=4的超杨-米尔斯理论中,应力张量多重态的三圈四点函数除了包含已知的梯形积分外,还包含两个未知的离壳保角积分.在本文中,我们评估未知的积分,从而获得三圈关联函数解析。积分具有有理函数乘以(多重)多项式的一般结构。我们使用的想法,导致奇点,以获得合理的系数,符号-与一个适当的anasterian其结构-作为一种手段,表征多个多项式,和技术的渐近展开的费曼积分,以获得积分在一定的限制。极限行为唯一地固定了积分的符号,然后我们将其提升以找到相应的多对数函数。最后的公式进行了数值验证。我们开发的技术可以更普遍地应用,我们说明了这一点,通过分析评估的积分之一,有助于在四个循环相同的四点函数。这个例子显示了前导奇点和符号的条目之间的联系。

英文摘要:

The three-loop four-point function of stress-tensor multiplets in N=4 super Yang-Mills theory contains two so far unknown, off-shell, conformal integrals, in addition to the known, ladder-type integrals. In this paper we evaluate the unknown integrals, thus obtaining the three-loop correlation function analytically. The integrals have the generic structure of rational functions multiplied by (multiple) polylogarithms. We use the idea of leading singularities to obtain the rational coefficients, the symbol - with an appropriate ansatz for its structure - as a means of characterising multiple polylogarithms, and the technique of asymptotic expansion of Feynman integrals to obtain the integrals in certain limits. The limiting behaviour uniquely fixes the symbols of the integrals, which we then lift to find the corresponding polylogarithmic functions. The final formulae are numerically confirmed. The techniques we develop can be applied more generally, and we illustrate this by analytically evaluating one of the integrals contributing to the same four-point function at four loops. This example shows a connection between the leading singularities and the entries of the symbol.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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