Simplified dark matter models

Authors

• s-channel
  • Antony Martini (Université catholique de Louvain) & Kentarou Mawatari (LPSC Grenoble)
    • Emails: kentarou.mawatari @ lpsc.in2p3.fr
• 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".
• ​1509.05785 : M. Neubert, J. Wang, C. Zhang, "Higher-order QCD predictions for dark matter production in mono-Z searches at the LHC".

Model files

• FR files (for spin-1)
  • dm_s_spin1.fr : the main model file for spin1 mediators.
  • dm_s_spin1_ew.fr : the add-on model file for spin1 mediators for EW.
  • Cabibbo.rst, Massless_5f.rst : the restriction files.
  • DMsimp_s_spin1.nb : this is an example Mathematica notebook that loads the spin-1 model, calculates the Feynman rules and extract the model files within the UFO format.
• FR files (for spin-0)
  • dm_s_spin0.fr : the main model file for spin0 mediators.
  • dm_s_spin0_ew.fr : the add-on model file for spin0 mediators for EW.
  • Cabibbo.rst, Massless_5f.rst : the restriction files.
  • DMsimp_s_spin0.nb : this is an example Mathematica notebook that loads the spin-0 model, calculates the Feynman rules and extract the model files within the UFO format.

• UFO files (for, e.g. MadGraph5_aMC@NLO)
  • DMsimp_s_spin1.zip : The model files for spin1 mediators.
  • DMsimp_s_spin0.zip : The model files for spin0 mediators.

(The old alpha version is available ​here.)

Version updates

*2015.08.24 - v1.0: release version.
*2016.09.23 - v2.0: included the Y1-lepton interactions (B.Zaldivar).

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~ / a z w+ w- [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 for s-channel mediators

• 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 / a z [QCD]

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

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

• mono-Higgs
  

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

---

Model files for tools for DM relic abundance and DM (in)direct detections

• DMsimp_s_spin1_LO_UFO.zip : The model files for spin1 mediators in UFO format (for MadDM).
• DMsimp_s_spin0_LO_UFO.zip : The model files for spin0 mediators in UFO format (for MadDM).
• DMsimp_s_spin1_LO_CH.zip : The model files for spin1 mediators in CH format (for MicrOMEGAs).
• DMsimp_s_spin0_LO_CH.zip : The model files for spin0 mediators in CH format (for MicrOMEGAs).

(The model keeps all the quark masses finite, and apply only to tree-level processes. In the CH format, we have only Xd without the EW part.)