Caravel: A C++ Framework for the Computation of Multi-Loop Amplitudes with Numerical Unitarity

Abstract

We present the first public version of Caravel, a C++17 framework for the computation of multi-loop scattering amplitudes in quantum field theory, based on the numerical unitarity method. Caravel is composed of modules for the $D$-dimensional decomposition of integrands of scattering amplitudes into master and surface terms, the computation of tree-level amplitudes in floating point or finite-field arithmetic, the numerical computation of one- and two-loop amplitudes in QCD and Einstein gravity, and functional reconstruction tools. We provide programs that showcase Caravel's main functionalities and allow to compute selected one- and two-loop amplitudes.

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• Universal Decomposition of Phase-Space Integrands
• The spectrum of Feynman-integral geometries at two loops
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• Integrands of Less-Supersymmetric Yang-Mills at One Loop
• Two-loop leading-color QCD corrections for Higgs plus two-jet production in the heavy-top limit