Version 17 (modified by NeilChristensen, 5 years ago) (diff) 

SM + new DY resonances
We consider new spin0, 1, and 2 resonances that can contribute to the schannel DrellYan processes p,p>l+,l,X and p,p>l,v,X where l is a charged lepton, v is a neutrino or antineutrino and X is the inclusive hadronic remnants. We implement the most general Lagrangian between these new bosons and the SM fermions and gluons allowed by Lorentz, quantum chromodynamic and electromagnetic invariance. In each case, we only include the leading effective terms which are either dimension4 or dimension5 operators. Furthermore, we drop all terms which vanish when the masses of the initialstate and finalstate particles are taken to zero. Further details can be found in the reference below.
Implementation Author
 Neil Christensen
 University of Wisconsin  Madison
 neil at hep.wisc.edu
in collaboration with ChengWei Chiang, GuiJun Ding, and Tao Han.
References
Model Files
 DYSMFR.tgz: FeynRules Model Files
Model Implementation
Details about this implementation can be found in the reference above. Additionally, the FeynRules automatic output for this model can be found here:
 DYSM.pdf: Fields, parameters, Lagrangians and Vertices.
Instructions
We provide a basic notebook giving examples of how to run the FeynRules interfaces on this model. Before running the notebook, the user must change $FeynRulesPath to the path of FeynRules on their computer and the user must change $ModelDir to the path to the DYSM FeynRules model files downloaded from here:
After loading the model in CalcHEP or MadGraph, suppose you want to run a Z' with SMlike couplings. The Z' name is VV, the mass is MVV, the width is WVV and you would set the couplings as:
 gVuR11=0.1861*(18/3*0.23369)
 gAuR11=0.1861*(1)
 gVuR22=0.1861*(18/3*0.23369)
 gAuR22=0.1861*(1)
 gVdR11=0.1861*(1+4/3*0.23369)
 gAdR11=0.1861*(1)
 gVdR22=0.1861*(1+4/3*0.23369)
 gAdR22=0.1861*(1)
 gVlR11=0.1861*(1+4*0.23369)
 gAlR11=0.1861*(1)
 gVlR22=0.1861*(1+4*0.23369)
 gAlR22=0.1861*(1)
You may also want to run a W' with SMlike couplings. The W' names are VVP+ and VVP, the width is WVVP and you would set the couplings as:
 hVqR11=0.231*cos(0.227736)
 hAqR11=0.231*cos(0.227736)
 hVqR12=0.231*sin(0.227736)
 hAqR12=0.231*sin(0.227736)
 hVqR21=0.231*sin(0.227736)
 hAqR21=0.231*sin(0.227736)
 hVqR22=0.231*cos(0.227736)
 hAqR22=0.231*cos(0.227736)
 hVlR11=0.231
 hAlR11=0.231
 hVlR22=0.231
 hAlR22=0.231
Interfaces
This model implementation is known to work with CalcHEP. The CalcHEP files can be found here:
This model also runs with MadGraph 5 but has not been as thoroughly tested. The files can be found here:
Please report any bugs to Neil Christensen.
Validation
The Feynman rules were computed by hand and compared with the FeynRules vertices and found to agree. Furthermore, the squared amplitudes for several DrellYan processes were calculated by hand and compared with the analytic output of CalcHEP and found to agree. Hermiticity of the Lagrangian was also tested at the Feynman rules level.
Attachments (6)

SMplus.nb.gz
(23.9 KB) 
added by NeilChristensen 8 years ago.
FeynRules Mathematica notebook that runs on the SMDY model files. Just change the paths.

SMDY.pdf
(241.0 KB) 
added by NeilChristensen 8 years ago.
Automatic FeynRules pdf output for model.

DYSM.pdf
(149.7 KB) 
added by NeilChristensen 8 years ago.
automatic FeynRules pdf output for model.

dy_sm_fr.tgz
(75.7 KB) 
added by NeilChristensen 8 years ago.
MadGraph? 5 files (UFO files)

DYSMFR.tgz
(10.9 KB) 
added by NeilChristensen 8 years ago.
FeynRules model files.

SMDYCH.tgz
(16.1 KB) 
added by NeilChristensen 8 years ago.
CalcHEP model files
Download all attachments as: .zip