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2019:groups:bsm:fislhc [2019/06/24 14:05]
andre.lessa
2019:groups:bsm:fislhc [2019/06/27 11:59] (current)
andreas.goudelis
Line 1: Line 1:
 **Project Acronym: FISLHC** **Project Acronym: FISLHC**
  
-**Interested people**: Andreas Goudelis, Genevieve Belanger, Dipan Sengupta, Nishita Desai, Aoife Bharucha, José Zurita, Jose Miguel No, Jan Heisig, Andre Lessa.+**Interested people**: Andreas Goudelis, Genevieve Belanger, Dipan Sengupta, Nishita Desai, Aoife Bharucha, José Zurita, Jose Miguel No, Jan Heisig, Andre Lessa, Sezen Sekmen, Adil Jueid, Giacomo Polesello.
  
 [Please add (or remove!) your name and feel free to edit tasks!] [Please add (or remove!) your name and feel free to edit tasks!]
  
-**Goal** : study if it's possible to test scenarios of freeze-in ​in which DM is produced through scattering of SM particles ​(as opposed ​to production ​from decays ​of a heavier ​bath particle).+**Goal** ​(generalised following discussion on 26/​6/​2019) ​: study if it's possible to realise ​freeze-in ​with much-stronger-than-feeble couplings and test the corresponding scenarios at the LHC (and direct/​indirect detection experiments). 
 + 
 +---- 
 +The answer appears to be positive according to our - preliminary - findings and estimates, and the trick is to assume a low reheating temperature. We discussed two effects ​(corresponding ​to regimes which can also overlap):  
 + 
 +* The reheating temperature being below the dark matter mass. In this case, in order to get the relic right one needs to increase the DM couplings since DM production ​relies on the tails of the distributions of the thermal ​bath particles. 
 + 
 +* The reheating temperature being below the mediator mass. In this case, even for large-ish couplings, the mediator is not produced on-shell and the effective interaction can be feeble. 
 + 
 +Of all models that one can think of, we agreed to consider three simple scenarios:  
 +* The singlet scalar model  
 +* A 2HDM + pseudoscalar singlet model 
 +* A t-channel model, like the ones in [[https://​arxiv.org/​abs/​1811.05478]] or https://​arxiv.org/​abs/​1705.09292
  
 **Tasks**: **Tasks**:
  
-1) Adopt a concrete ​freeze-in model and see to which extent it's possible to increase ​the coupling of DM to the visible sector ​(e.g. by lowering ​the reheating temperature ​and, genericallyby playing with the ratio of the mediator mass and the reheating temperature). Jose Miguel has proposed to start with the simple singlet scalar ​model and lower the reheating temperature below the Higgs mass.+1) Write model files for all models 
 + 
 +2) Compute the freeze-in ​DM abundance by varying the model parameters ​and the reheating temperature. For the latter, an indicative interval could be between 1 GeV (such that we're roughly above the QCD scale) ​and 1 TeV (such that we don't go far above LHC-accessible masses). 
 + 
 +3) Compute direct detection constraints. The t-channel modelin particularhas a loop-induced contribution which must be calculated 
 + 
 +4) Consider "​peripheral"​ constraints,​ such as flavour constraints in the t-channel model 
 + 
 +5) Compute LHC constraints (presumably quite a few channels, depending on the model) 
 + 
 +**UFO files for different benchmark models**: 
 + 
 +2HDM + pseudoscalar $a$ {{ :​2019:​groups:​bsm:​pseudoscalar_2hdm_uli.tar.gz |2HDM+a UFO file }} (by Uli Haisch) from [[https://​arxiv.org/​abs/​1810.09420|1810.09420]] (LHC DM Working Group). 
 + 
 +Feynrules file (with some restrictions w.r.t. Uli's) for 2HDM + pseudoscalar $a$  {{ :​2019:​groups:​bsm:​typeii2hdm_pseudoportal_dm.fr.tar.gz |2HDM+a .fr file }} . 
 + 
 +Feynrules files for the t-channel ​model considered in [[https://​arxiv.org/​abs/​1811.05478]]:​ [[https://​feynrules.irmp.ucl.ac.be/​wiki/​FICPLHC]]
  
-2) Depending on the findings of 1) we'll see how to proceed. 
  
 **References**:​ **References**:​
  
  
2019/groups/bsm/fislhc.1561377906.txt.gz · Last modified: 2019/06/24 14:05 by andre.lessa