Changes between Version 11 and Version 12 of SMEFT
 Timestamp:
 09/14/17 19:44:41 (2 years ago)
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SMEFT
v11 v12 1 = = '''Standard Model Effective Field Theory (SMEFT)''' ==1 = '''Standard Model Effective Field Theory (SMEFT) sim''' = 2 2 3 '''Authors''' 3 == Authors == 4 4 5 5 Ilaria Bravio, Yun Jiang and Micheal Trott … … 13 13  14 14 15 '''The model description'' 15 == The model description == 16 16 17 The SMEFT is constructed out of a series of SU C(3) × SUL(2) × UY(1) invariant (local and analytic) higher dimensional operatorsbuilt out of the SM fields.17 The SMEFT is constructed out of a series of SU(3),,C,, × SU(2),,L,, × U(1),,Y,, invariant (local and analytic) higher dimensional operators L,,6,,, L,,7,,, ... built out of the SM fields. 18 18 19 The main purpose of the SMEFTsim package is to provide a complete tool for the analysis of the tree level interference terms between the $L_{6}$ dependent amplitude and the SM amplitudes in a measured process.19 The SMEFTsim package is to provide a complete tool for the analysis of the tree level interference terms between the L,,6,, dependent amplitude and the SM amplitudes in a measured process. In this spirit, we stress that this package is neither to be employed for the extraction of accurate SM predictions nor equipped for NLO calculations in MadGraph5_aMC@NLO. 20 20 21 The implementation of the entire parameter space of the SMEFT and the automatic inclusion of the shifts due to the choice of an input parameters set is a key feature. 21 Two independent sets are supplied in the SMEFTsim package. Each one consists three different versions of the SMEFT based on the flavor symmetry assumption adopted: 22 * a fully flavour general SMEFT 23 * a U(3)^5^ − SMEFT with nonSM complex phases 24 * Minimal flavor violation (MFV) SMEFT 22 25 23 In this spirit, the models are not meant to be employed for the extraction of accurate SM predictions and they are not equipped for NLO calculations in MadGraph5_aMC@NLO.26 The models are built upon the default SM implementation in FeynRules, from which they inherit the SM fields, parameters and Lagrangian definitions. The original file has been extended and modified to include the complete set of L,,6,, baryon number conserving operators of the Warsaw basis. The loopinduced effective couplings of SM Higgs to gg, γγ and Zγ have also been included. At this stage, the ghost Lagrangian has been left in its SM form. The entire parameter space of the L,,6,, SMEFT and the automatic inclusion of the shifts due to the choice of an input parameters set are implemented. 24 27 25 The SMEFTsim package consists of several model files for the treelevel analysis of the SMEFT at d = 6. It contains both model files for FeynRules [6] and preexported UFO files [5] to be interfaced e.g. with MadGraph5_aMC@NLO [83]. 26 Two independent models sets are supplied, called “Models set A” and “Models set B”: each contains three different versions of the SMEFT: a fully flavour general SMEFT, a U(3)5 − SMEFT with nonSM complex phases and MFV − SMEFT.12 In addition, each case has 28 Each set contains a single master code and a number of subroutines, along with several restriction files. 29 The model file can be loaded in FeynRules using the notebook program, with the product of the UFOs. 30 Model files and preexported UFO files to be interfaced with MadGraph5_aMC@NLO can be downloaded on this page. 27 31 28 All the models are built upon the default SM implementation in FeynRules, from which they inherit the SM fields, parameters and Lagrangian definitions. The original file has been extended and modified to include the complete set of L(6) baryon number conserving operators of the Warsaw basis. The loopinduced effective couplings of SM Higgs to gg, γγ and Zγ have also been included. At this stage, the ghost Lagrangian has been left in its SM form.29 32 30 '''Change log''' 33 == Change log == 31 34 32 v1.0 (1 4.09.2017) The first version released35 v1.0 (17.09.2017) The first version released 33 36 34 '''References''' 37 == References == 35 38 36 I. Bravio, Y. Jiang and M. Trott, ''The SMEFTsim package, theory and tools'', arXiv:1709.XXXX39 * I. Bravio, Y. Jiang and M. Trott, ''The SMEFTsim package, theory and tools'', arXiv:1709.XXXX 37 40 38 41  … … 40 43 '''Model Set A''' 41 44 45 42 46 '''Model Set B'' 43 47 48 In the master code two flags: Scheme and Flavor are established, which are used to identify the input scheme and flavor symmetry being adopted in loading the model. 44 49 45 '''UFO generated files''' 46 50 * This archive contains all the model files. Should be expanded in the FR model directory. 51 * Example of a Mathematica® notebook loading the model 47 52 48 53  49 54 50 51 55 == UFO generated files == 56 57   Set A  Set B  58  Flavor general SMEFT    59  MFV SMEFT    60  U(3)^5^ SMEFT   