Les Houches

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**Chair:** Andreas Goudelis	

**Members:**  Benjamin Fuks, Nishita Desai, Giacomo Polesello, Sanjoy Biswas, Suchita Kulkarni, Dipan Sengupta, Björn Herrmann, Daniel Schmeier, Daniele Barducci, Michele Frigerio, Aoife Bharucha, Genevieve Belanger

** Main idea: **
Would an observed excess of j+MET events allow for a distinction of the underlying model? Can the monojet pT distribution differentiate among different SM-DM couplings? An enhancement of the signal for large pT occurs if the coupling is proportional to the exchanged momentum; this happens for a derivative coupling, typically encountered, e.g., in compositeness models. 

** Simplest example: **
The SM plus one singlet scalar DM, including a dim-6 operator coupling the Higgs doublet to the DM.
A recent reference on this model: http://inspirehep.net/record/1341060?ln=en , see section 3.1.1, in particular eq.(3.3) for the Higgs-DM-DM coupling, if somebody is interested to generate the related pT distribution...
 
A preliminary study of the monojet signature in this model was performed in the master thesis by Sylvain Lacroix (2013, in French): see section 3.9 for the case without derivative coupling, and section 4.3 for the addition of the derivative operator.

Notes by M.Frigerio including motivations, the simplest model, and two non-minimal models are available here: {{:2015:groups:higgs:dmhiggs:monojetpt.pdf|}}


**Useful references**

  * Composite Dark Matter and LHC Interplay
http://arxiv.org/abs/1404.7419

  * Dark Matter Constraints on Composite Higgs Models
http://arxiv.org/abs/1501.05957

  * A rather inclusive summary on signatures of various EFT DM models
http://arxiv.org/abs/1506.03116

  * The ATLAS/CMS Dark Matter forum summary
http://arxiv.org/abs/1507.00966

  * A relevant MSc thesis from a student of Michele's (in French)
{{:2015:groups:higgs:dmhiggs:rapport.pdf|}}

**Tools**
  * UFO model file for some s-channel simplified models:
https://feynrules.irmp.ucl.ac.be/wiki/DMsimp

  * FeynRules (with corresponding CalcHEP and UFO) model files for the singlet model, with an effective g-g-h vertex implemented for h production
{{:2015:groups:higgs:dmhiggs:compositedmleshouches.tar|}}

**Micromegas results**
{{:2015:groups:higgs:dmhiggs:scdm-micro.tar.gz|}}
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