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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 decaying in the VELO 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 (see attached the full output file)

 |*"Selected by Hlt1SMOG2D2KpiDecision"            |     29807 |         33 |(0.1107122 +- 0.01926186)% |
 |*"Selected by Hlt1SMOG2DiMuonHighMassDecision"   |     29807 |          1 |(0.003354917 +- 0.003354860)% |
 |*"Selected by Hlt1SMOG2DisplacedDiMuonDecision"  |     29807 |          5 |(0.01677458 +- 0.007501192)% |
 |*"Selected by Hlt1SMOG2KsTopipiDecision"         |     29807 |         21 |(0.07045325 +- 0.01536874)% |

The conditions:

  • A candidate with a PV in the smog region [-541mm,-341mm]

  • The decay vertex of the dimuon pair located outside the cell [-341mm;inf]       

  • At least one of the muon track with pt > 300MeV       

  • FDCHI2 > 15       

  • Max vertex chi2 of 30        

  • Mom IP < 1 mm       

  • Invariant mass starting at dimuon threshold

  • chi2Corr < 2

output_hlt1.txt

Goes with Moore!3299

Edited by Samuel Belin

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