Displaced Dimuon High Level Trigger

Complete: 4

Trigger outline (preliminary)

  • events have to pass the L1 dimuon trigger
  • L2 muons are reconstructed and filtered on
  • primary vertex is reconstructed
  • muon tracks are reconstructed using the L1/L2 muons as seeds
  • two muon tracks are combined (to build e.g. a J/psi) and required to be within a certain mass range
  • The Kalman Vertex Fitter is applied on these two tracks
  • A cut is applied on the decay length singnificance, on the chiČ of the fit and on the angle between the momentum of the two combined tracks and the decay length

Usage for CMSSW_1_3_1_HLT2

  • tcshell:
scramv1 project CMSSW CMSSW_1_3_1_HLT2
cd CMSSW_1_3_1_HLT2/src
eval `scramv1 run -csh`
project CMSSW
cvs co -r V00-00-50 HLTrigger/btau
cd HLTrigger/btau
scramv1 b
  • modify data/displacedmumu/PathBToJpsiToMumu.cff, data/displacedmumu/L3ForDisplacedMumuTrigger.cff and test/hltBToJPsiToMumu.cfg

What can be modified?

in included package HLTDisplacedmumuFilter

  • minimal decay length significance (> 3)
  • maximal normalised Chi2 of the Kalman Vertex Fitter (< 10)
  • minimal cosine of the opening angle between the momentum of the two combined tracks and the decay length (> 0.9)
in CandSelector
  • the transverse momentum of the muon (> 2.5GeV)

in CandCombiner
  • the invariant mass (2.95 < m < 3.25) and momentum of the mumu particle(> 4GeV)

Review Status

Editor/Reviewer Comments
LotteWilke - 26 Mar 2007 page author
JennyWilliams - 27 Mar 2007 edited to fit swguide general layout

Responsible: LotteWilke
Last reviewed by: Reviewer

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Topic revision: r6 - 2007-05-11 - unknown

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