Caravel: A C++ framework for the computation of multi-loop amplitudes with numerical unitarity

Souto Gonçalves de abreu, Samuel [UCL] Dormans, J. [Albert-Ludwigs-Universität] Febres Cordero, F. [Florida State University] Ita, H. [Albert-Ludwigs-Universität] Kraus, M. [Florida State University] Page, B. [Université Paris-Saclay] Pascual, E. [Albert-Ludwigs-Universität] Ruf, M.S. [Albert-Ludwigs-Universität] Sotnikov, V. [Werner-Heisenberg-Institut] et al.[show all]

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.