Changes between Version 26 and Version 27 of SMEFT

09/17/17 21:09:57 (3 years ago)




    v26 v27  
    1 = '''Standard Model Effective Field Theory  (SMEFT) sim''' =
     1= '''Standard Model Effective Field Theory  -- The SMEFTsim package''' =
    33== Authors ==
    1515== The model description ==
    1718The 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.
     20The SMEFTsim package provides a complete implementation of the dimension-6 Lagrangian adopting the Warsaw basis [] and it is designed to enable numerical studies of the LO interference of the SMEFT with the SM, while neglecting NLO corrections.
     22The SM Lagrangian is extended with the inclusion of the complete set of baryon-number-conserving operators of the Warsaw basis and of the SM loop-induced  Higgs couplings to gg, γγ and Zγ. The code assumes unitary gauge: in particular, modifications of the ghost Lagrangian have not been included.
     23Importantly, field rotations required to have canonically normalized kinetic terms and parameter redefinitions following from the choice of an input parameters set are automatically applied in the Lagrangian.
     25The SMEFTsim package provides implementations for 3 different flavor assumptions and 2 input scheme choices, for a total of 6 different models.
     27The flavor symmetry assumptions adopted are (see [] for a detailed description)
     28* The flavour general case
     29* The U(3)^5 flavor symmetric case, with possible non-SM CP-violating phases
     30* A linear Minimal flavor violation (MFV) ansatz, in which non-SM CP-violating effects are neglected, but flavor-violation spurion insertions are allowed in quark currents
     32For each model it is possible to choose between two input parameters sets for the electroweak sector, namely:
     33* α scheme: {α,,em,,, m,,Z,, , G,,f,,}
     34* m,,W,, scheme: {m,,W,,, m,,Z,, , G,,f,,}
     38each set contains a main file, a number of subroutines and restriction files.
     39Pre-exported UFO files to be interfaced with MadGraph5_aMC@NLO can also be downloaded from this page.
    1943The 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.
    2448Model files and pre-exported UFO files to be interfaced with MadGraph5_aMC@NLO can be downloaded on this page.
    26 Each model set constructs three different versions of the SMEFT based on the flavor symmetry assumption adopted:
    27 * Flavour general SMEFT
    28 * U(3)^5^ − SMEFT with non-SM complex phases
    29 * Minimal flavor violation (MFV) SMEFT
    31 In each model two input parameter schemes of choosing external parameters are employed:
    32 * α scheme: {α,,em,,, m,,Z,, , G,,f,,}
    33 * m,,W,, scheme: {m,,W,,, m,,Z,, , G,,f,,}
    3551Note that the two sets differ in the structure and in the technical implementation of L,,6,,, but they produce consistent 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.
    4258== References ==
    44 * I. Bravio, Y. Jiang and M. Trott, ''The SMEFTsim package, theory and tools'', arXiv:1709.XXXX
     60* I. Brivio, Y. Jiang and M. Trott, ''The SMEFTsim package, theory and tools'', arXiv:1709.XXXX
    4864'''Model Set A'''
    50 *  [attachment:""] This archive contains all the FeynRules files.
     66* [attachment:""] This archive contains all the FeynRules files.
    5167* [attachment:"SMEFTsim-setA.nb"] Example of a Mathematica® notebook loading the model