Two-loop amplitude generation in OpenLoops
arXiv:2202.00703 · doi:10.21468/SciPostPhysProc.7.018
Abstract
Numerical tools, such as OpenLoops, provide NLO scattering amplitudes for a very wide range of hard scattering amplitudes in a fully automated way. In order to match the numerical precision of current and future experiments, however, the higher precision of NNLO calculations is essential, and their automation in a similar tool highly desirable. In our approach, D-dimensional amplitudes are decomposed into loop-momentum tensor integrals with coefficients constructed in four dimensions and rational terms. We present a fully generic algorithm for the efficient numerical construction of the tensor coefficients, which constitutes an important building block for an automated NNLO tool.
Contribution to the proceedings of the 15th International Symposium on Radiative Corrections: Applications of Quantum Field Theory to Phenomenology (RADCOR + LoopFest 2021); v2: Typos fixed, reference updated