Changes between Version 12 and Version 13 of SMEFT


Ignore:
Timestamp:
09/14/17 20:13:53 (2 years ago)
Author:
YunJiang
Comment:

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  • SMEFT

    v12 v13  
    1919The 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.
    2020
    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:
     21The 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 loop-induced 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.
     22
     23Two independent sets are supplied in the SMEFTsim package. Each set contains a single master code and a number of subroutines, along with several restriction files. The model file can be loaded in FeynRules using the notebook program, with the product of the UFOs.
     24Model files and pre-exported UFO files to be interfaced with MadGraph5_aMC@NLO can be downloaded on this page.
     25
     26Each model set constructs three different versions of the SMEFT based on the flavor symmetry assumption adopted:
    2227* a fully flavour general SMEFT
    2328* a U(3)^5^ − SMEFT with non-SM complex phases
    2429* Minimal flavor violation (MFV) SMEFT
    2530
    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 loop-induced 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.
     31In each model two different input schemes {α,,em,,, m,,Z,, , G,,f,, } and {m,,W,,, m,,Z,, , G,,f,, } are available.
    2732
    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 pre-exported UFO files to be interfaced with MadGraph5_aMC@NLO can be downloaded on this page.
     33
     34Note that the two models sets differ in the structure and in the technical implementation of L,,6,,, but they produce equivalent results: the use of both sets is recommended for debugging and validation of the numerical results. We appreciate if you could report us any inconsistency or bugs.
    3135
    3236
     
    5559== UFO generated files ==
    5660 
    57 ||                          ||    Set A  ||       Set B ||
    58 || Flavor general SMEFT  ||  ||  ||                             
    59 || MFV  SMEFT       ||  ||  || 
    60 || U(3)^5^ SMEFT     ||  ||  || 
     61||                          ||    Set A  ||  || Set B || ||
     62||   ||  α scheme || m,,W,, scheme ||  α scheme || m,,W,, scheme ||
     63|| Flavor general SMEFT  ||  ||  ||  ||  ||                           
     64|| MFV  SMEFT       ||  ||  ||   ||  ||
     65|| U(3)^5^ SMEFT     ||  ||  ||   ||  ||