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arXiv 2409.12445hep-thhep-ph
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${\cal N}=4$ 超杨-米尔斯理论中应力张量超多重态的两圈四点形状因子解析计算

Analytic two-Loop four-point form factor of the stress-tensor supermultiplet in ${\cal N}=4$ SYM

Yuanhong Guo, Lei Wang, Gang Yang, YiXiong Yin

AI总结:

本文计算了平面 ${\cal N}=4$ SYM 中应力张量超多重态的两圈四点 MHV 形状因子,利用幺正性切割、IBP 约化和五边形函数得到有限余项,并通过三重共线极限等检验验证了结果,揭示了被积函数层面的方向性对偶共形对称性。

摘要:

我们计算了平面 ${\cal N}=4$ 超杨-米尔斯(SYM)理论中应力张量超多重态的两圈四点 MHV 形状因子。当转换到 ${\cal N}=4$ SYM 语境下时,该形状因子类似于 QCD 重顶夸克极限下的希格斯加四胶子振幅。我们通过幺正性切割方法得到了直到两圈的完整 $D$ 维被积函数。随后,我们利用 IBP 约化将结果表示为一组均匀超越基积分,其中包含 Abreu 等人最近给出的两圈非平面五点单质量积分 [PRL 132 (2024) 14]。我们以五边形函数的形式得到了两圈有限余项的函数表达式。我们的余项的符号确认了 Dixon 等人报告的自举结果 [PRL 130 (2023) 11]。我们对结果进行了多种非平凡检验,包括三重共线极限,该极限恢复了两圈六胶子余项。我们还证明了该形状因子在被积函数层面具有方向性对偶共形对称性。我们的结果有望为进一步研究反极点对偶性以及 QCD 中希格斯加四部分子振幅的计算提供新的启示。

英文摘要:

We compute the two-loop four-point MHV form factor of the stress-tensor supermultiplet in planar ${\cal N}=4$ super Yang-Mills (SYM). This form factor is analogous to the Higgs plus four-gluon amplitudes in the heavy-top limit of QCD when translated to the ${\cal N}=4$ SYM context. We obtain the full $D$-dimensional integrands up to two loops via unitarity-cut methods. Subsequently, we utilize IBP reduction to express the result in terms of a set of uniformly transcendental basis integrals, incorporating the two-loop non-planar five-point one-mass integrals recently given by Abreu et al. [PRL 132 (2024) 14]. We obtain the two-loop finite remainder in the functional form in terms of the pentagon functions. The symbol of our remainder confirms the bootstrap results reported by Dixon et al. [PRL 130 (2023) 11]. We perform various non-trivial checks of our results, including the triple-collinear limit, which recovers the two-loop six-gluon remainder. We also show that the form factor has a directional dual conformal symmetry at the integrand level. Our results are expected to shed further light on the study of antipodal dualities and the computation of Higgs plus four-parton amplitudes in QCD.

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