The Standard Model
Authors
- Claude Duhr
- ETH, Zurich
- duhrc@…
- Neil Christensen
- Michigan State University
- neil@…
- Benjamin Fuks
- IPHC Strasbourg / University of Strasbourg
- benjamin.fuks@…
- Celine Degrande
- IPPP University of Durham
- celine.degrande@…
Model Files
- SM.fr : This is the new main file (FeynRules versions >= v1.6.2).
- SM_old.fr : This is the older implementation (FeynRules versions < v1.6.2).
Model Restrictions
- Massless.rst: Only the top, bottom and charm quarks, and the tau lepton are massive.
- DiagonalCKM.rst: The CKM maktrix is diagonal.
- Cabibbo.rst: 3rd generation mixing is off.
Instructions
The Standard Model (SM) is implemented in both Feynman and unitary gauge. A switch FeynmanGauge
has been created. To switch between the two simply set FeynmanGauge = True/False
inside your mathematica notebook after loading the model but before doing any calculations with it (finding vertices for example.) FeynmanGauge
is set to False
by default. The NLO counterterms have been computed and can be found in the
SMQCD.nlo. They can be exported in the UFO format to Madgraph5/aMCatNLO.
Examples
- SM.nb: This is an example Mathematica® notebook that loads SM.fr and calculates Feynman rules.
Validation
The SM implementation was extensively tested on various 2-to-2 processes. A selection is shown in this table. (Note that the discrepancy with MG stock simply comes from the fact that MG stock has the 4 higgs vertex not implemented). The counterterms analytic expressions have been checked with the literature and the UFO compared with the built in version of SM in Madgraph5/aMCatNLO.
Interfaces
This model implementation is known to work with the following interfaces:
UFO models
- SM_NLO.tar.gz UFO model with QCD corrections with the top and bottom yukawa renormalised in the on-shell scheme
- SM5F_NLO.tar.gz UFO model with QCD corrections in the 5 flavour scheme (massless b but non-vanishing bottom yukawa renormalised in the MSbar)
- SM4F_NLO.tar.gz UFO model with QCD corrections in the 4 flavour scheme (massive b but bottom yukawa renormalised in the MSbar)
Attachments (11)
-
DiagonalCKM.rst
(499 bytes
) - added by 15 years ago.
Restriction file for a diagonal CKM matrix
-
Cabibbo.rst
(818 bytes
) - added by 15 years ago.
Restriction file for a CKM with only Cabbibo mixing
-
XS1.jpg
(94.9 KB
) - added by 14 years ago.
cross sections for a selection of SM processes.
-
SM_old.fr
(22.8 KB
) - added by 13 years ago.
Older implementation of the SM
- Massless.rst (724 bytes ) - added by 11 years ago.
- SM.fr (24.8 KB ) - added by 11 years ago.
- SMQCD.nlo (109.4 KB ) - added by 11 years ago.
- SM.nb (28.8 KB ) - added by 11 years ago.
- SM5F_NLO.tar.gz (21.1 KB ) - added by 7 years ago.
- SM4F_NLO.tar.gz (21.9 KB ) - added by 7 years ago.
- SM_NLO.tar.gz (21.9 KB ) - added by 7 years ago.
Download all attachments as: .zip