Simplified dark matter models

Authors

• s-channel
  • Antony Martini (Université catholique de Louvain) & Kentarou Mawatari (Vrije Universiteit Brussel)
    • Emails: kentarou.mawatari @ vub.ac.be
• 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.

Model files

• DMsimp_UFO.zip: the s-channel model files in UFO format
• TO BE DONE: include the s-channel+EW model files in UFO format

NLO process samples for s-channel mediators

Remember that "scalar" below means scalar/pseudoscalar and "vector" means vector/axial-vector.

• NLO vector mediator + jets
  

import model DMsimp_UFO 
generate p p > xd xd~ j DMV=2 DMS=0 QCD=1 QED=0 [QCD]
generate p p > xd xd~ j j  DMV=2 DMS=0 QCD=1 QED=0 [QCD]

• NLO ttbar associated production (for vector coupling to both top and light quarks) at NLO
  

import model DMsimp_UFO 
generate p p > xd xd~ t t~ / y0 [QCD] 

• NLO ttbar associated production with a vector mediator coupling only to tops
  

import model DMsimp_UFO-onlytops
define p = p b b~
define j = p
generate p p > xd xd~ t t~ / y0 [QCD] 

• NLO ttbar associated production with a scalar mediator coupling only to tops
  

import model DMsimp_UFO-onlytops
define p = p b b~
define j = p
generate p p > xd xd~ t t~ / y1 [QCD] 

• NLO associated production with a Z with a vector mediator Y1 coupling to light quarks (no coupling of a Z with Y1)
  

import model DMsimp_UFO
define p = p b b~
define j = p
generate p p > xd xd~ z / y0 [QCD]

• NLO associated production with a W with a vector mediator Y1 coupling to light quarks (no coupling of a W with Y1)
  

import model DMsimp_UFO
define p = p b b~
define j = p
define wpm = w+ w-
generate p p > xd xd~ wpm / y0 [QCD]

• NLO associated production with a gamma with a vector mediator Y1 coupling to light quarks (no coupling of a gamma with Y1)
  

import model DMsimp_UFO
define p = p b b~
define j = p
generate p p > xd xd~ a / y0 [QCD]

LO processes loop (top-quark) induced

• LO mono jet loop-induced with a scalar mediator

import model DMsimp_UFO-onlytops  
generate p p > xd xd~ j DMV=0 [QCD]

• LO monojet loop-induced with a vector mediator
  

import model DMsimp_UFO-onlytops
generate p p > xd xd~ j DMS=0 [QCD]

• LO mono-Higgs loop-induced with scalar mediator (no interaction between the h and the mediator)
  

import model DMsimp_UFO-onlytops
generate p p > xd xd~ h DMS=2 DMV=0 [QCD]

• LO mono-Higgs loop-induced with vector mediator (no interaction between the h and the mediator)
  

import model DMsimp_UFO-onlytops
generate p p > xd xd~ h DMV=2 DMS=0 [QCD]

• LO mono-Z loop-induced with scalar mediator (no interaction between the Z and the scalar mediator)
  

import model DMsimp_UFO-onlytops
generate p p > xd xd~ z DMS=2 DMV=0 [QCD]

• LO mono-Z loop-induced with vector mediator (no interaction between the Z and the vector mediator)
  

import model DMsimp_UFO-onlytops
generate p p > xd xd~ z DMV=2 DMS=0 [QCD]

• O mono-photon loop-induced with scalar mediator (no interaction between the gamma and the scalar mediator)
  

import model DMsimp_UFO-onlytops
generate p p > xd xd~ a DMS=2 DMV=0 [QCD]

NOTE: this process gives zero because of C parity for both scalar and pseudoscalar mediators. It is here for reference.

• LO mono-photon loop-induced with vector mediator (no interaction between the gamma and the vector mediator)
  

import model DMsimp_UFO-onlytops
generate p p > xd xd~ a DMV=2 DMS=0 [QCD]

Version updates

*2015.06.11 - v0.1_alpha: alpha version.
*2015.06.16 - v0.2_alpha: alpha version : deleted “DMT” coupling (for spin-2 mediator model) from couplings_order.py. Added onlytops restriction to only allow vector and scalar mediators coupling to tops. (Thanks to Uli Haisch for testing).