ANATAR: AN Automated Tool for higher-order Amplitude geneRation

A bstract We present a new M athematica package that provides a platform to perform multi-loop computations. A natar integrates several existing tools designed for higher-order computations. In particular, it uses QG raf to generate Feynman diagrams and relies on F orm to perform the Dirac and colour algebras. This makes it very efficient without compromising user-friendliness and flexibility. In addition, A natar is equipped with functionalities to manipulate the generated amplitudes and to extract scalar form factors. The resulting expressions can be mapped to integral families that can subsequently be reduced to master integrals via dedicated interfaces to codes for integration-by-parts reduction. Support for large classes of BSM models with the same gauge group as the SM is provided, and in particular A natar is optimised for computations in effective field theories. We review and introduce the main functionalities of A natar and illustrate its use for phenomenological applications.