标题： 自旋-2 形状因子在 QCD 中的三环阶计算 显示英文标题

标题： Spin-2 Form Factors at Three Loop in QCD

摘要： 自旋-2场在标准模型之外的物理中经常是候选者，即具有额外维度的模型，其中自旋-2的Kaluza-Klein引力子与标准模型的场耦合。 此外，在希格斯粒子搜索的背景下，自旋-2场已被研究作为标量希格斯玻色子的替代方案。 在本文中，我们给出了SU(N)规范理论中带有$n_f$个轻味夸克的自旋-2夸克-反夸克和自旋-2胶子-胶子形式因子的完整三环QCD辐射修正。 这些形式因子对涉及自旋-2粒子的强子反应中由夸克-反夸克和胶子-胶子引发的过程都有贡献。 我们使用Sudakov积分微分方程研究了这些形式因子中红外奇点的结构，并发现来自环积分软区和共线区的异常维数与电弱矢量玻色子和希格斯形式因子的相同，证实了QCD振幅中红外奇点的普遍性。 显示英文摘要

摘要： Spin-2 fields are often candidates in physics beyond the Standard Model namely the models with extra-dimensions where spin-2 Kaluza-Klein gravitons couple to the fields of the SM. Also, in the context of Higgs searches, spin-2 fields have been studied as an alternative to the scalar Higgs boson. In this article, we present the complete three loop QCD radiative corrections to the spin-2 quark-antiquark and spin-2 gluon-gluon form factors in SU(N) gauge theory with $n_f$ light flavors. These form factors contribute to both quark-antiquark and gluon-gluon initiated processes involving spin-2 particle in the hadronic reactions at the LHC. We have studied the structure of infrared singularities in these form factors up to three loop level using Sudakov integro-differential equation and found that the anomalous dimensions originating from soft and collinear regions of the loop integrals coincide with those of the electroweak vector boson and Higgs form factors confirming the universality of the infrared singularities in QCD amplitudes.