Abstract
The SMEFTsim package [1] is designed to enable automated computations in the Standard Model Effective Field Theory (SMEFT), where the SM Lagrangian is extended with a complete basis of dimension six operators. It contains a set of models written in FeynRules and pre-exported to the UFO format, for usage within Monte Carlo event generators. The models differ in the flavor assumptions and in the input parameters chosen for the electroweak sector. The present document provides a self-contained, pedagogical reference that collects all the theoretical and technical aspects relevant to the use of SMEFTsim and it documents the release of version 3.0. Compared to the previous release, the description of Higgs production via gluon-fusion in the SM has been significantly improved, two flavor assumptions for studies in the top quark sector have been added, and a new feature has been implemented, that enables the treatment of linearized SMEFT corrections to the propagators of unstable particles.SMEFTsim 3.0 is available on the Github website https://SMEFTsim.github.io and on the FeynRules database http://feynrules.irmp.ucl.ac.be/wiki/SMEFT.
Highlights
LHC physics is about to enter a precision era that will span over the two decades
New opportunities to hunt for new physics will arise: direct searches of new particles will be complemented by indirect searches, that target possible deviations from the predictions of the Standard Model (SM)
While the isolation of this kind of signatures is not without challenges, indirect searches present some very attractive features. They do not rely on specific assumptions about the nature of the new physics under scrutiny and, at the same time, their sensitivity in terms of new physics scales can potentially extend beyond the energy reach of the collider
Summary
LHC physics is about to enter a precision era that will span over the two decades. The SMEFTsim package [1] was designed in order to enable the Monte Carlo simulation of arbitrary processes in the effective theory, in the spirit of providing a unified, generalpurpose tool for SMEFT physics at the LHC It provides complete tree level, unitary gauge predictions at O(Λ−2), including all the dimension six operators in the so-called Warsaw basis [42]. This section reviews the Lagrangian manipulations that are required in order to compute physical processes in the SMEFT truncated at O(Λ−2).4The procedure described here largely overlaps with what reported e.g. in [1, 32, 48,49,50,51,52,53,54,55,56,57,58,59]
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