Anastasiou Charalampos, Beerli Stefan, Daleo Alejandro
Institute for Theoretical Physics, ETH, CH-8093, Zürich, Switzerland.
Phys Rev Lett. 2008 Jun 20;100(24):241806. doi: 10.1103/PhysRevLett.100.241806.
We present the two-loop QCD amplitude for the interaction of two gluons and a CP-even Higgs boson in the minimal supersymmetric standard model (MSSM). We apply a novel numerical method for the evaluation of Feynman diagrams with infrared, ultraviolet, and threshold singularities. We discuss subtleties in the ultraviolet renormalization of the amplitude with conventional dimensional regularization, dimensional reduction, and the four dimensional helicity scheme. Finally, we show numerical results for scenarios of supersymmetry breaking with a rather challenging phenomenology in which the Higgs signal in the MSSM is suppressed in comparison to the standard model.
我们给出了最小超对称标准模型（MSSM）中两个胶子与一个CP偶数希格斯玻色子相互作用的两圈量子色动力学振幅。我们应用了一种新颖的数值方法来评估具有红外、紫外和阈值奇点的费曼图。我们讨论了在传统维数正规化、维数约化和四维螺旋度方案下该振幅紫外重整化中的微妙之处。最后，我们展示了超对称破缺情形下的数值结果，这些情形具有相当具有挑战性的现象学特征，其中与标准模型相比，MSSM中的希格斯信号被抑制。
