Tag And Probe / BPAG Offline DQM

Purpose

The purpose of this page is to document Muon HLT Offline DQM for tag and probe with muon resonances. The monitoring from Tag and Probe is supplemental to the baseline Muon HLT Offline DQM. The software was developed by the members of both the B PAG and the Muon HLT group. The resonances monitored are J/Psi, Upsilon, and Z.

What selection is applied to muons?

Probe track = tracker track
d0cut = 2.0
z0cut = 25.0  
RECO Muon Requirements: "pt > 0.5 && abs(eta) < 2.1 "),
HLT Muon Requirements: "pt > 0.5 && abs(eta) < 2.1 "),

 # define the tag collection here
     tagCollectionName = cms.untracked.string ("tagForProbeAnyMuon"),
     tagTrackCollection = cms.untracked.string ("innerTrack"),
     # this is the how you specify the trigger you want the probe to pass
     # for now, the tag trigger = probe trigger
     tagObjectTrigger = cms.untracked.string(""),
      tagD0cut = cms.untracked.double(2.0),
      tagZ0cut = cms.untracked.double(50.0), 
     tagChi2cut = cms.untracked.double(30.0),
     tagNHits = cms.untracked.int32(20),
      tagRecoCuts = cms.untracked.string ("pt > 1.0 && abs(eta) < 2.1 "),
      tagHltCuts  = cms.untracked.string ("pt > 1.0 && abs(eta) < 2.1 "),



---+ Which triggers are monitored?

   * Low pT single muons trigger, HLT_Mu3

---+ How are the fits run?

   * The invariant mass distributions of All and Passing Tag 'n' Probe pairs are fit simultaneously with maximum likelihood
   * The looked-for efficiency is incorporated as a parameter of the fit and the errors are calculated by the fitter
   * example fit: <br />
     <img src="%ATTACHURLPATH%/fitInPtBin5.gif" alt="fitInPtBin5.gif" width='523' height='272' />

---+ Where is the code?

   * [[http://cmssw.cvs.cern.ch/cgi-bin/cmssw.cgi/CMSSW/DQMOffline/Trigger/src/BPAGTrigAnalyzer.cc?view=log][BPAGTrigAnalyzer.cc]]
   * [[http://cmssw.cvs.cern.ch/cgi-bin/cmssw.cgi/CMSSW/DQMOffline/Trigger/plugins/DQMGenericTnPClient.cc?view=log][DQMGenericTnPClient]]



DQM


-- Main.JasonSlaunwhite - 2009-08-31