Simplified Models for Coannihilating Dark Matter

This is a set of simplified models for coannihaliting dark matter based on ​The Coannihilation Codex. Each of the models includes a dark matter candidate, a coannihilation partner and a mediator in various representations of SU(3)xSU(2)xU(1). These models with minimal particle content provide a way to design generic collider searches for coannihilation, whose results can then be applied to more specific models. Another set of simplified models where the mediator is integrated out and X is colored have been presented in ​Simplified Phenomenology for Colored Dark Sectors and the UFO files can be generated using the ​FR-CDS package.

---

Authors

The implementation of the models has been done by

• Anna Kaminska (JGU Mainz, akaminsk@…)
• Maikel de Vries (JGU Mainz, mdevrie@…)
• Felix Yu (JGU Mainz, yu-001@…)
• José Zurita (KIT Karlsruhe, jose.zurita@…)

in collaboration with Michael Baker, Joachim Brod, Malte Buschmann, Sonia El Hedri, Joachim Kopp, Jia Liu, Andrea Thamm, Xiao-Ping Wang and Felix Yu.

---

Model Description

Each of the models introduces three new fields: DM (dark matter candidate), X (coannihilation partner), M (s- or t-channel mediator). Currently the set of models comprises:

• Leptoquark model (lq_met):

  $\mathrm{DM} \equiv (1,1,0)_\mathrm{M} \qquad \mathrm{X} \equiv (3,2,\tfrac{7}{3})_\mathrm{F} \qquad \mathrm{M}_s \equiv (3,2,\tfrac{7}{3})_\mathrm{S}$ 
  

• Triplet diquark model (dq3_met):

  $\mathrm{DM} \equiv (1,1,0)_\mathrm{M} \qquad \mathrm{X} \equiv (3,1,-\tfrac{2}{3})_\mathrm{F} \qquad \mathrm{M}_s \equiv (3,1,-\tfrac{2}{3})_\mathrm{S}$ 
  

• Sextet diquark model (dq6_met):

  $\mathrm{DM} \equiv (1,1,0)_\mathrm{M} \qquad \mathrm{X} \equiv (6,1,\tfrac{8}{3})_\mathrm{F} \qquad \mathrm{M}_s \equiv (6,1,\tfrac{8}{3})_\mathrm{S}$ 
  

• Scalar octet model (so_met):

  $\mathrm{DM} \equiv (1,1,0)_\mathrm{M} \qquad \mathrm{X} \equiv (8,2,1)_\mathrm{F} \qquad \mathrm{M}_s \equiv (8,2,1)_\mathrm{S}$ 
  

A more detailed description for each of the models including validation for MadGraph and Micromegas/MadDM is available in the manual (pdf).

---

Interfaces

These models files work with and have been tested for several programs. The UFO output has been tested to work with ​MadGraph 5 and ​MadDM. As well as the ​CalcHEP model files which have been tested to work with ​MicrOMEGAs. See the manual for more details.

---

References

• ​https://arxiv.org/abs/1510.03434: The Coannihilation Codex, overview of all simplified models and discussion of leptoquark coannihilation phenomenology.
• ​https://arxiv.org/abs/1605.08056: Hunting for Dark Matter Coannihilation by Mixing Dijet Resonances and Missing Transverse Energy, discussion of triplet diquark coannihilation phenomenology.
• ​https://arxiv.org/abs/1703.00452: Simplified Phenomenology for Colored Dark Sectors, simplified models with just a DM candidate and a colored coannihilation partner.

---

Model Files

All of the FeynRules model files below need the SM implementation of FeynRules.

• lq_met.fr: leptoquark model file.
• dq3_met.fr: triplet diquark model file.
• dq6_met.fr: sextet diquark model file.
• so_met.fr: scalar octet model file.
• resonance_met.nb: Mathematica notebook which generates the model files (UFO and CalcHEP).
• ufo_models.tar.gz: UFO files for all of the above models.
• calchep_models.tar.gz: CalcHEP files for all of the above models.