SMEFTsim
contains a set of UFO models that have been validated following the recommendations in CERN-LPCC-2019-02 and using the dedicated MadGraph5_aMC@NLO
plugin.
The procedure consists in pairwise comparisons between models, based on the values returned for a set of squared amplitudes.
Given a list of 2-->n processes and a list of points in parameter space, the plugin computes the SM squared amplitude, the pure SM-L6 interference and the quadratic L6 contribution at one random phase-space point for each process and parameter point. The validation is considered successful if all the squared amplitudes agree within a permille.
The validation of the SMEFTsim
UFOs was performed
- internally, comparing models with same flavor assumptions and different input scheme and viceversa.
- externally, comparing the
general
,top
andtopU3l
models with m_W input scheme todim6top
andSMEFT@NLO
This repository contains two types of files that have been produced in the validation process:
Each directory cards_MODEL1_to_MODEL2
contains files named param_XX.dat
, where XX
is the name of a parameter in MODEL2
.
This is a parameter card of MODEL1
that corresponds to setting XX = 1
and all other MODEL2
parameters to 0.
These cards were used as input to the validation, and are provided here to aid the translation between different UFO models.
The models are labeled as follows:
general
:SMEFTsim_general_MwScheme_UFO_v3_0
utf
:SMEFTsim_U35_MwScheme_UFO_v3_0
MFV
:SMEFTsim_MFV_MwScheme_UFO_v3_0
top
:SMEFTsim_top_MwScheme_UFO_v3_0
topU3l
:SMEFTsim_topU3l_MwScheme_UFO_v3_0
Labels with an extra A
indicate that the alphaScheme
is used instead, for instance generalA
refers to SMEFTsim_general_alphaScheme_UFO_v3_0
.
The label SMEFTatNLO
corresponds to the SMEFTatNLO_U2_2_U3_3_cG_4F_LO_UFO
model released in 2018, while SMEFTatNLOv1
denotes SMEFTatNLO_v1_0
released in 2020.
The output_PDFs
directory contains the PDF files produced as output by the validation plugin.
One file is produced for each comparison.
Discrepancies larger than a permille are marked in red, unless the absolute value of the squared amplitude is smaller than 1e-16 for both models, in which case they are blue.