Changes between Version 1 and Version 2 of SMEFTatNLO

Timestamp:

Dec 10, 2018, 2:12:45 PM (6 years ago)

Author:

Ken Mimasu

Comment:

--

SMEFTatNLO

@@ -1 @@
-=== To be filled
+
+== Standard Model Effective Theory at Next-to-Leading-Order in QCD ==
+
+ ''Céline Degrande, Gauthier Durieux, Fabio Maltoni, Ken Mimasu, Eleni Vryonidou & Cen Zhang''
+
+A complete implementation of the SMEFT compatible with NLO QCD predictions. 
+
+The implementation is based on the Warsaw basis of operators and includes all degrees of freedom consistent with the following symmetry assumptions:
+* CP-conservation.
+* U(2),,Q,, x U(2),,u,, x U(3),,d,, x U(3),,L,, x U(3),,e,, flavor symmetry.
+The CKM matrix is approximated as a unit matrix. The flavor symmetry imposes that only the top quark is massive. The model therefore implements the 5-flavor scheme for PDFs. 
+The bosonic operators are implemented as in the Warsaw basis employing the M,,Z,,, M,,W,,, G,,F,, scheme of Electroweak input parameters. 
+
+The Standard Model input parameters that need to be specified are:
+
+   M,,Z,,, M,,W,,, G,,F,,, M,,H,,, M,,t,,, α,,S,,(M,,Z,,)
+
+The fermionic degrees of freedom (2 & 4 fermion operators) are defined according to the common standards and prescriptions established by the  LHC TOP WG for the EFT interpretation of top-quark measurements at the LHC (see the [https://feynrules.irmp.ucl.ac.be/wiki/dim6top dim6top page] for more information). This model has been validated at LO with the dim6top implementation.
+
+A new coupling order, {{{NP}}}, is added to the model for the SMEFT interactions.
+
+=== Usage notes ===
+The {{{NLO}}} restriction card should be used when importing the model for NLO QCD generation:
+{{{
+ > import model SMEFTatNLO_U2_2_U3_3_cG_4F_LO_UFO-NLO
+}}}
+This invokes a restricted set of operators for which the required counterterms are implemented.
+
+We recommend specifying the full {{{QCD}}}, {{{QED}}} and {{{NP}}} orders for process generation.
+
+For example:
+
+{{{
+ > generate p p > t t~ QCD=2 QED=0 NP=2 [QCD]
+}}}
+Generated the NLO QCD top pair production process including the QCD-induced SM and the SMEFT contributions.
+=== Model Files ===
+* [https://feynrules.irmp.ucl.ac.be/wiki/dud SMEFTatNLO_U2_2_U3_3_cG_4F_LO_UFO.tgz] : archive of UFO model - 4 fermion and c,,G,, operators at LO, U(2)^2^ x U(3)^3^ flavor symmetry
+=== Version updates ===
+* 2018/20/12  - v.0.1: First version upload, 4F and c,,G,, operators at LO pending validation; a few minor convention tweaks required to match dim6top exactly. {{{decays.py}}} missing.