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add displaced dimuon produced in smog2 collisions

Samuel Belin requested to merge sbelin_smog2displaced into 2024-patches

Adding a line called "Hlt1SMOG2DisplacedDimuon" to trigger on dark matter candidate produced in a SMOG2 with a dimuon decay within the VELO.

The line should start at dimuon threshold mass, with the candidate displaced but with its momentum direction compatible with a primary vertex in the SMOG2 cell. This should be be a free line in term of rate, as we see in the test with pAr+pp simulation

 |*"Selected by Hlt1SMOG2DisplacedDiMuonDecision"  |     29807 |          1 |(0.003354917 +- 0.003354860)% |

The conditions:

  • A candidate with a PV in the smog region [-541mm,-341mm]
  • The decay vertex `z` of the dimuon pair located at [-541mm;inf]      
  • muon track with pt > 500MeV       
  • FDCHI2 > 100       
  • Max vertex chi2 of 25        
  • Mom IP < 1 mm       
  • Invariant mass starting at 500MeV
  • Min pt of dimuon 500MeV
  • chi2Corr < 1.3

Goes with Moore!3299

Edited by Samuel Belin

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