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The computation of renormalized one-loop amplitudes in quantum field theoryrequires not only the knowledge of the Lagrangian density and the correspondingFeynman rules, but also that of the ultraviolet counterterms. More in general,and depending also on the methods used in the actual computation of theone-loop amplitudes, additional interactions might be needed. One example isthat of the R2 rational terms in the OPP method. In this paper, we argue thatthe determination of all elements necessary for loop computations in arbitrarymodels can be automated starting only from information on the Lagrangian at thetree-level. In particular, we show how the R2 rational and ultravioletcounterterms for any renormalizable model can be computed with the help of anew package, which we name NLOCT and builds upon FeynRules and FeynArts. Toshow the potential of our approach, we calculate all additional rules that areneeded to promote a Two Higgs Doublet Model Lagrangian to one-loop computationsin QCD and electroweak couplings.

Automatic evaluation of UV and R2 terms for beyond the Standard Model Lagrangians: a proof-of-principle