Version 18 (modified by NeilChristensen, 4 years ago) (diff) 

Minimal Higgsless Model or 3Site Model
Implementation Author
 Neil Christensen
 Michigan State University
 neil@…
This implementation is based on an earlier implementation done in collaboration with Alexander Belyaev which can be found here.
References
 Phys.Rev.D74:075011,2006: This is the first description of the 3Site Model.
 Phys.Rev.D78:031701,2008 : This is a study of the LHC collider phenomenology of the 3Site Model that uses the earlier LanHEP version that this implementation was based on.
 arXiv:0906.2472 : This is the 2nd FeynRules paper where this implementation was published. It contains a shortened version of the notes below.
Model Files
 3Sitev1.4.tar.gz: 3Site Model modelfiles.
Model Implementation
Details about the Minimal Higgsless Model can be found in the reference above. This implementation goes beyond that reference in two ways. It uses exact formulas for all the internal parameters and wavefunctions and the Goldstone bosons and ghosts are worked out in complete detail as is necessary for Feynman gauge. Full details about this implementation can be found in:
 3SiteNotes.pdf: Notes giving the details of the model implementation.
 3SiteTeX.pdf: Automatic LaTeX output from this model (including the Feynman rules).
Instructions
The 3Site Model 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.
Examples
We provide a basic notebook giving examples of how to run the interfaces on this model:
Interfaces
This model implementation is known to work with the following interfaces:
 CalcHEP/CompHEP Interface
 MadGraph Interface
 Sherpa Interface: This model works with a beta version of Sherpa that will be released later this year.
 FeynArts Interface: A handful of calculations have been done but a thorough validation has not been done.
Validation
Over 200 2>2 processes were run in a variety of ways. First, each process was compared between the original LanHEP implementation and the current FeynRules implementation. Second, each process was run across multiple montecarlos including CalcHEP, CompHEP, MadGraph and Sherpa. Third, each process was run in two different gauges, namely Feynman gauge (in CalcHEP and CompHEP) and in unitary gauge (in CalcHEP, MadGraph and Sherpa). The cross section was computed for each process and compared to one another. Agreement to better than 1% was found for all processes. The parameters for these calculations were taken as in the model files above. The energies and cuts for these calculations were:
Particles involved  sqrt(s)  p_T 
Only SM  600GeV  20GeV 
W',Z'  1200GeV  200GeV 
Heavy Fermion Partners  10TeV  2TeV 
where "Particles" refers to what particles are involved in the process. The results of these validations can be seen in the following images:
Each of these processes was also run at a single phase space point of the squared amplitude. In this test, only CalcHEP in Feynman and unitary gauge and MadGraph were used. It is planned to include Sherpa at a later date. The energies were chosen as in the cross section comparison. The angle was chosen to be 73.3 degrees. Agreement to better than 0.1% was found in all cases. Here are images of the results:
These tests were performed with the following versions of the software:
Software  Version 
Mathematica  7.0.0 
FeynRules  1.4.0 
CalcHEP  2.5.3 
CompHEP  4.4.104 
MadGraph  4.4.21 
Sherpa  Private development version 
Attachments

3Sitev1.3.tar.gz
(10.0 KB) 
added by NeilChristensen 8 years ago.
3Site (Minimal Higgsless Model) files

3Site.pdf
(100.0 KB) 
added by NeilChristensen 8 years ago.
Notes giving the details of the model implementation.

3SiteModel.pdf
(457.8 KB) 
added by NeilChristensen 8 years ago.
Automatic LaTeX output from this model.

Examplev1.0.nb.tar.gz
(23.4 KB) 
added by NeilChristensen 8 years ago.
Example notebook for this model.
 CSstrong.jpg (81.5 KB)  added by NeilChristensen 8 years ago.
 CSffAA.jpg (34.5 KB)  added by NeilChristensen 8 years ago.
 CSffAZ.jpg (62.5 KB)  added by NeilChristensen 8 years ago.
 CSffZZ.jpg (82.0 KB)  added by NeilChristensen 8 years ago.
 CSffAW.jpg (69.0 KB)  added by NeilChristensen 8 years ago.
 CSffZW.jpg (89.6 KB)  added by NeilChristensen 8 years ago.
 CSffWW.jpg (71.1 KB)  added by NeilChristensen 8 years ago.
 CSVVVVcharged.jpg (71.9 KB)  added by NeilChristensen 8 years ago.
 CSVVVVneutral.jpg (107.4 KB)  added by NeilChristensen 8 years ago.
 CSllll.jpg (95.1 KB)  added by NeilChristensen 8 years ago.
 CSllqq.jpg (79.5 KB)  added by NeilChristensen 8 years ago.
 CSlnln.jpg (106.4 KB)  added by NeilChristensen 8 years ago.
 CSlnqq.jpg (79.8 KB)  added by NeilChristensen 8 years ago.
 PSstrong.jpg (71.3 KB)  added by NeilChristensen 8 years ago.
 PSffAA.jpg (30.6 KB)  added by NeilChristensen 8 years ago.
 PSffAZ.jpg (50.6 KB)  added by NeilChristensen 8 years ago.
 PSffZZ.jpg (63.6 KB)  added by NeilChristensen 8 years ago.
 PSffAW.jpg (55.0 KB)  added by NeilChristensen 8 years ago.
 PSffZW.jpg (73.3 KB)  added by NeilChristensen 8 years ago.
 PSffWW.jpg (59.2 KB)  added by NeilChristensen 8 years ago.
 PSVVVVcharged.jpg (91.5 KB)  added by NeilChristensen 8 years ago.
 PSVVVVneutral.jpg (91.5 KB)  added by NeilChristensen 8 years ago.
 PSllll.jpg (76.6 KB)  added by NeilChristensen 8 years ago.
 PSllqq.jpg (59.6 KB)  added by NeilChristensen 8 years ago.
 PSlnln.jpg (82.0 KB)  added by NeilChristensen 8 years ago.
 PSlnqq.jpg (63.1 KB)  added by NeilChristensen 8 years ago.

3Sitev1.4.tgz
(10.1 KB) 
added by NeilChristensen 4 years ago.
3Site Model v1.4