Simplified dark matter models

Authors

• s-channel
  • Antony Martini (Université catholique de Louvain) & Kentarou Mawatari (Vrije Universiteit Brussel)
    • Emails: kentarou.mawatari @ vub.ac.be
• s-channel (electroweak)
  • Jian Wang (Johnnas Gutenberg University of Mainz) & Cen Zhang (Brookhaven National Laboratory)
    • Emails: cenzhang @ bnl.gov

Description of the model

This is simplified dark matter models for NLO. Our lagrangian consists of different types of DM:

• Xr (real scalar DM)
• Xc (complex scalar DM)
• Xd (Dirac spinor DM)
• Xm (Majorana spinor DM) (to be done.)
• ...

and different types of mediators:

• s-channel
  • Y0 (spin-0)
  • Y1 (spin-1)
  • Y2 (spin-2) [to be done.]
  • ...

• t-channel [to be done.]

One can find the model lagrangian in the note. See more details in

• ​1508.00564 : O. Mattelaer, E. Vryonidou, "Dark matter production through loop-induced processes at the LHC: the s-channel mediator case".
• ​1508.05327 : M. Backovic, M. Kramer, F. Maltoni, A. Martini, K. Mawatari, M. Pellen, "Higher-order QCD predictions for dark matter production at the LHC in simplified models with s-channel mediators".
• ​1508.xxxxx : M. Neubert, J. Wang, C. Zhang, "".

Model files

• dm_s_spin1.fr : the main model file for spin1 mediators.
• dm_s_spin1_ew.fr : the main model file for spin1 mediators for EW.
• dm_s_spin0.fr : the main model file for spin0 mediators.
• dm_s_spin0_ew.fr : the main model file for spin0 mediators for EW.
• DMsimp_s_spin1.nb : this is an example Mathematica notebook that loads the model, calculates the Feynman rules and extract the model files within the UFO format.
• DMsimp_s_spin1_UFO.zip : The model files in UFO format (for MadGraph5_aMC@NLO).
• DMsimp_s_spin0_UFO.zip : The model files in UFO format (for MadGraph5_aMC@NLO).

(The old alpha version is available ​here.)

Sample commands for MadGraph5_aMC@NLO

NLO process samples for s-channel spin-1 mediators

• Associated production with jets
  

import model DMsimp_s_spin1
generate p p > xd xd~ j [QCD]
add process p p > xd xd~ j j [QCD]

• Associated production with a Higgs
  

import model DMsimp_s_spin1 
generate p p > xd xd~ h [QCD] 

NLO process samples for s-channel spin-0 mediators

• Associated production with a top-quark pair
  

import model DMsimp_s_spin0
generate p p > xd xd~ t t~ [QCD] 

• Associated production with a photon/Z/W
  

import model DMsimp_s_spin0 
generate p p > xd xd~ a [QCD]
generate p p > xd xd~ z [QCD]
generate p p > xd xd~ w+ [QCD]
generate p p > xd xd~ w- [QCD] 

LO loop-induced process samples

• mono-jet
  

import model DMsimp_s_spin0
generate p p > xd xd~ j [QCD]

• mono-Z
  

import model DMsimp_s_spin0
generate p p > xd xd~ z [QCD]

• mono-photon (will be 0 for all couplings)
  

import model DMsimp_s_spin0
generate p p > xd xd~ a [QCD]

• mono-Higgs
  

import model DMsimp_s_spin0
generate p p > xd xd~ h [QCD]

Version updates

*2015.08.24 - v1.0: release version.