Difference: SingleTopHiggsBBEventSel (11 vs. 12)

Revision 122013-08-19 - AndreyPopov

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META TOPICPARENT name="SingleTopHiggsBB"

Reference event selection for th(bb) analyses

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  (The first criterion is hard-coded in plugin PrimaryVertexObjectFilter, the last one is defined in the default parameter set pvSelector, which is imported in the code snippet under the link above.)
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For a long time single-top analyses have been requiring the first vertex in offlinePrimaryVertices (i.e. the one with the largest $\sum p_T^2$ of associated tracks) to satisfy these conditions; however, at the moment many analyses require at least one good primary vertex instead. We need to agree on selection. I can find a (weak) motivation for checking the first vertex.
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The first vertex in offlinePrimaryVertices (i.e. the one with the largest $\sum p_T^2$ of associated tracks) are required to satisfy these conditions.
 

Event filters

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  Exactly the same definition is used to prevent electrons from clustering into jets with the help of top projections and to veto additional loose electrons in an event.
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Description of selection Implementation
Transverse momentum is greater that 20 GeV/c 1 reco::PFCandidate::pt() > 20.
fabs(eta) < 2.5 1 fabs(PFCandidate::eta()) < 2.5
$\rho$-corrected relative isolation with cone size 0.3 is smaller than 0.15 1 Non-trivial to implement; description is to be added
Transverse impact parameter w.r.t. to the first primary vertex is smaller than 0.2 cm 2 Applied in module pfMuonsFromVertex
Longitudinal distance to the first primary vertex is smaller than 0.5 cm 2
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Description of selection Implementation
Transverse momentum is greater that 20 GeV/c 1 reco::PFCandidate::pt() > 20.
$\vert\eta\vert < 2.5$ 1 fabs(PFCandidate::eta()) < 2.5
$\rho$-corrected relative isolation with cone size 0.3 is smaller than 0.15 1 Non-trivial to implement; description is to be added
Transverse impact parameter w.r.t. to the first primary vertex is smaller than 0.2 cm 2 Applied in module pfMuonsFromVertex
Longitudinal distance to the first primary vertex is smaller than 0.5 cm 2
  1 This selection is inherited from TWikiTopRefEventSel.
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Loose muons

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The definition below is a proposal for discussion.
 Exactly the same definition of loose muons is used in top projections in PFBRECO and to reject events that contain additional muons (veto).
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Description of selection Implementation
Muon is reconstructed by PF algorithm 1 'muonRef.isAvailable & muonRef.isPFMuon' in pfSelectedMuons.cut 2
Avoid using muons that are only standalone muons 1 'muonRef.isAvailable & (muonRef.isGlobalMuon  || isTrackerMuon)' in pfSelectedMuons.cut 2
Transverse momentum is greater that 10 GeV/c 3 reco::PFCandidate::pt() > 10.
fabs(eta) < 2.5 3 fabs(reco::PFCandidate::eta()) < 2.5
$\Delta\beta$-corrected relative isolation with cone size 0.4 is smaller than 0.2 4 Can be implemented with module pfIsolatedMuons as described in 4
Transverse impact parameter w.r.t. to the first primary vertex is smaller than 0.2 cm 5 Applied in module pfMuonsFromVertex
Longitudinal distance to the first primary vertex is smaller than 0.5 cm 5
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Description of selection Implementation
Muon is reconstructed by PF algorithm 1 'muonRef.isAvailable & muonRef.isPFMuon' in pfSelectedMuons.cut 2
Avoid using muons that are only standalone muons 1 'muonRef.isAvailable & (muonRef.isGlobalMuon  || isTrackerMuon)' in =pfSelectedMuons.cut= 2
Transverse momentum is greater that 10 GeV/c 3 reco::PFCandidate::pt() > 10.
$\vert\eta\vert<2.5$ 3 fabs(reco::PFCandidate::eta()) < 2.5
$\Delta\beta$-corrected relative isolation with cone size 0.4 is smaller than 0.2 4 Can be implemented with module pfIsolatedMuons as described in 4
Transverse impact parameter w.r.t. to the first primary vertex is smaller than 0.2 cm 5 Applied in module pfMuonsFromVertex
Longitudinal distance to the first primary vertex is smaller than 0.5 cm 5
  1 Recommended in SWGuideMuonId.
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Tight muons

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Tight muons are a strict subset of loose ones. Quality criteria follow recommendations from Muon POG.
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Tight muons are a strict subset of loose ones. Quality criteria follow recommendations from Muon POG:

Description of selection Implementation
The candidate is a global muon pat::Muon::isGlobalMuon
The candidate passes PF ID pat::Muon::isPFMuon
Fit to global track has $\chi^2/\mbox{n.d.f.} < 10$ pat::Muon::globalTrack()->normalizedChi2() < 10.
At least one hit in muon chambers included in the global track pat::Muon::globalTrack()->hitPattern().numberOfValidMuonHits() > 0
At least two muon stations with hits pat::Muon::numberOfMatchedStations() > 1
Transverse impact parameter w.r.t. to the first primary vertex $d_{xy} < 2$ mm fabs(pat::Muon::dB() < 0.2)
Longitudinal distance of tracker track from the first primary vertex $d_z < 5$ mm fabs(pat::Muon::muonBestTrack()->dz(vertex->position())) < 0.5
At least one hit in pixel system pat::Muon::innerTrack()->hitPattern().numberOfValidPixelHits() > 0
At least six tracker layers with measurements pat::Muon::track()->hitPattern().trackerLayersWithMeasurement() > 5

All the above requirements can be evaluated with the help of muon::isTightMuon function defined in DataFormats/MuonReco/interface/MuonSelectors.h or, equivalently, method pat::Muon::isTightMuon.

Isolation is calculated in the same way as for loose muons with a tighter cut value (recommended in SWGuideMuonId):

Description of selection Implementation
$\Delta\beta$-corrected relative isolation with cone size 0.4 is smaller than 0.12 (pat::Muon::chargedHadronIso() + std::max(pat::Muon::neutralHadronIso() + pat::Muon::photonIso() - 0.5 * pat::Muon::puChargedHadronIso(), 0.)) / pat::Muon::pt() < 0.12 1

1 Note SWGuideMuonId provides two different recipes to calculated muon isolation. The one cited here exploits the same value maps for isolation (muPFIsoValueCharged04 and others) as module pfIsolatedMuons; thus, it is fully consistent with PFBRECO and should be preferred.

Kinematical cuts are used on top of the above quality requirements in order to stay on the trigger plateau:

Description of selection Implementation
Transverse momentum is greater that 26 GeV/c pat::Muon::pt() > 26.
$\vert\eta\vert<2.1$ fabs(eta) < 2.1

Below the previous version of criteria is provided. It will be removed soon.

 
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  Muon
 
Particle Flow Muon ID isPFMuon
Muon Reconstruction Alghoritm ID isGlobalMuon
pT > 26 GeV
 
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