Changes between Version 27 and Version 28 of SMEFT
 Timestamp:
 09/17/17 21:24:43 (2 years ago)
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SMEFT
v27 v28 17 17 18 18 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. 19 The SMEFTsim package provides a complete implementation of the dimension6 Lagrangian adopting the Warsaw basis [https://arxiv.org/abs/1008.4884] 19 20 20 The SMEFTsim package provides a complete implementation of the dimension6 Lagrangian adopting the Warsaw basis [https://arxiv.org/abs/1008.4884] and it is designed to enable numerical studies of the LO interference of the SMEFT with the SM, while neglecting NLO corrections. 21 The SM Lagrangian is extended with the inclusion of the complete set of baryonnumberconserving operators of the Warsaw basis and of the SM loopinduced Higgs couplings to gg, γγ and Zγ. 22 Importantly, 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. 21 23 22 The SM Lagrangian is extended with the inclusion of the complete set of baryonnumberconserving operators of the Warsaw basis and of the SM loopinduced Higgs couplings to gg, γγ and Zγ. The code assumes unitary gauge: in particular, modifications of the ghost Lagrangian have not been included.23 Importantly, 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.24 24 25 25 The SMEFTsim package provides implementations for 3 different flavor assumptions and 2 input scheme choices, for a total of 6 different models. … … 34 34 * m,,W,, scheme: {m,,W,,, m,,Z,, , G,,f,,} 35 35 36 Two independent sets (A and B) are supplied. Each set contains a main file, a number of subroutines and restriction files. 37 Preexported UFO files to be interfaced with MadGraph5_aMC@NLO can also be downloaded on this page (see Table below). 38 39 Note 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. 40 41 We appreciate if you could report us any inconsistency or bugs. 36 42 37 43 38 each set contains a main file, a number of subroutines and restriction files. 39 Preexported UFO files to be interfaced with MadGraph5_aMC@NLO can also be downloaded from this page. 44 == Usage recommendations == 40 45 46 The SMEFTsim package is designed to enable numerical studies of the LO interference of the SMEFT with the SM, while neglecting NLO corrections. 47 In this spirit, it has not been optimized for loop calculations in the SM or in the SMEFT. In particular: 41 48 49 * the Lagrangian assumes unitary gauge. Using it in R,,xi or Feynman gauge may lead to inconsistent results, as the ghost Lagrangian have not been modified to account for L,,6 corrections. 42 50 43 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. 44 45 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 Wilson coefficient 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. 46 47 Two 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. 48 Model files and preexported UFO files to be interfaced with MadGraph5_aMC@NLO can be downloaded on this page. 49 50 51 Note 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. 51 * the UFO files are not suitable for NLO evaluation in MadGraph5_aMC@NLO 52 52 53 53 … … 76 76  77 77 78 == UFO generated files==78 == Preexported UFO files (include restriction cards) == 79 79 80 80   Set A   Set B  