6.4 Cuts

Cuts may be applied to select the data to be displayed. They are grouped (InDet (6.4.1 Cuts for Inner Detector (InDet)), Calo (6.4.2 Cuts for Calorimeters (Calo)), MuonDet (6.4.3 Cuts for Muon Detector (MuonDet)), AOD (6.4.4 Cuts for Analysis Object Data (AOD)) and ATLAS (6.4.5 Cuts for whole Detector (ATLAS))) and are accessible via the Cuts tab of the parameter control section in the Control Window.

Cuts can be made on tracks, track associations, hits, calorimeter cells, TRT straws, angular regions.

Each cut can be switched on or off by clicking on the small check-box on the left hand side. The value of each cut is displayed in the white field and is modified by changing the value in the field, followed by pressing the Enter key on the keyboard.

Cuts which act on real numbers may select values either < or > the cut value. The selection of < or > is toggled by clicking on them with the left mouse button.

For cuts applied to integer values a left-click causes a pull down menu to appear where you may select according to the C/JAVA syntax: =, != (not equal), <, <=, > or >=.

6.4.1 Cuts for Inner Detector (InDet)

Most cuts are applied to tracks.

If the track association of hits or calorimeter cells is known, they may be selected according to the tracks - with their cuts - they are associated to. See Hits By STr and Hits By Track.

  • |Pt| : (tracks) transverse momentum [GeV/c]

  • |d0| : (tracks) distance of closest approach to the beam axis [cm]

  • |z0| : (tracks) distance in Z from nominal origin at d0 [cm]

  • |d0 Loose| : (tracks) outer loose d0 cut [cm]

  • |z0-ZVtx| : (tracks) distance in Z from primary vertex at d0 [cm]

  • Num SpacePoint : (tracks) number of associated silicon space points

  • |STr (code)| : (tracks) code of simulated track

  • STr (barcode) : (tracks) kine number of simulated track

  • STr type : (tracks) type of simulated track

    • charged hadron (default)

    • tau

    • electron

    • muon

    • neutral hadron

    • photon

    • neutrino

  • SimVertex : (tracks) originating simulated vertex (0=primary)

  • SCT/Pixel : ...

    • All (default)

    • Endcap-: ...

    • Barrel: ...

    • Endcap+: ...

  • TRT_DriftCircle : ...

    • All (default)

    • Barrel-: ...

    • Barrel+: ...

  • Track Index : (tracks) identifier of reconstructed track

  • Hits By STr :

    • All (default)

    • Connected : hits connected to simulated tracks

    • Unconnected : hits unconnected to simulated tracks

  • Hits By Track :

    • All (default)

    • Connected : hits connected to reconstructed tracks

    • Unconnected : hits unconnected to reconstructed tracks

  • Hit type:

  • Group : group number of silicon hit: 0 = noise. See 7.1.13 Hit Filter Setup (Hit Filter).

  • TRT Threshold: threshold for TRT Straws

    • high (default)

    • low

6.4.2 Cuts for Calorimeters (Calo)

  • |Jet Et|

  • |LAr Energy|: energy deposit [MeV]

  • |Tile Energy|: energy deposit [MeV]

  • |HEC Energy|: energy deposit [MeV]

  • |FCAL Energy|: energy deposit [MeV]

  • FCAL

    • All (default)

    • Endcap-

    • Endcap+

  • LAr

    • All (default)

    • Endcap-

    • Endcap+

  • HEC

    • All (default)

    • Endcap-

    • Endcap+

  • |Cluster ET| : cluster to which the cell is associated

  • Cluster

    Cluster to which the cell is associated

  • |LVL1 Trigger Energy|

6.4.3 Cuts for Muon Detector (MuonDet)

No cuts available yet.

6.4.4 Cuts for Analysis Object Data (AOD)

  • |BJet Pt| : B-tagged Jet transverse momentum

  • BJet lhSig : B-tagged Jet likelihood significance, combined B-tagging algorithms.

  • BJet weight : B-tagged Jet B-tagging algorithm's weight

  • |Electron Pt| : Electron transverse momentum

  • Electron isEM (*) : Electron electromagnetic criteria passed (bitmap)

  • Electron eOverp : Electron ratio of energy over momentum

  • |Muon Pt| : Muon transverse momentum

  • Muon chi2 : Muon fit chi2

  • |Photon Pt| : Photon transverse momentum

  • Photon isEM (*) : Photon electromagnetic criteria passed (bitmap)

  • |TauJet Pt| : Tau transverse momentum

  • |TauJet Charge| : Tau total charge

  • TauJet NumTrack : Tau number of tracks

  • TauJet isolFrac : Tau isolation fraction

  • TauJet logLhRatio : Tau log-likelihood ratio between tau and jet

N.B.

(*) Cut-logic for isEM: int required. Logic in bitmap: "1" means "do not care". Non-passing of algorithm is allowed. "0" means: "is required to be passed". E.g. 16 (binary: 1000) means that algorithm encoded into fourth bit is allowed to have failed.

6.4.5 Cuts for whole Detector (ATLAS)

  • Index : (tracks) in the range 0 to numTracks-1

  • Module : ...

  • Layer : ...

  • Cut φ : (angular region) hits and tracks in the range φ±φcut

  • φ : (angular region) ...

  • Cut η : (angular region) hits and tracks in the range η±ηcut

  • η : (angular region) ...

  • ByList : (list) only data in the currently selected list (3.3.4 Lists Window) are shown

  • Summary : a summary of the effects of the currently applied cuts is shown in the output window (3.1.5 Output Display).