Contains tau candidates found at level 3 by L3TauHadronic. The Tau tool is based on cal clusters found with L3TCalCluster and on tracks found by GlobalTracker. It can perform either a cal based search, matching tracks to found cal clusters, or a track based search, matching cal clusters to found track clusters. This is done by setting ALGORITHM to CAL_BASED or TRACK_BASED respectively in the trigger list. It also collects CPS and EM3 information. The package is l3fTauTools.
In the trigger list, the following parameters can be
set to use external tools:
TRACK: tracking is turned on/off by setting it to GlobalTracker or NONE
CPS: NONE or CPS_CLUS
CLUSTER: CAL_CLUS (L3TCalCluster with conesize of .7)
One can also cut on the width and profile, delta(eta)/delta(phi) track
matching values and the number of matched tracks.
Finally the tool behaviour is also governed by rcp parameters in
L3TauTools.rcp (min pt when calling GlobalTracker, min pt of leading
track in TRACK_BASED and min ET of calorimeter clusters).
| Variable | Definition |
| L3Taun | Number of tau candidates found |
| L3Taualgo | Algorithm used (1=CAL_BASED, 2=TRACK_BASED) |
| L3TaukineT | Cluster energy |
| L3TaukineX | Projection of 4-vector along x |
| L3TaukineY | Projection of 4-vector along x |
| L3TaukineZ | Projection of 4-vector along z |
| L3TauvtxX | Cluster vertex x |
| L3TauvtxY | Cluster vertex y |
| L3TauvtxZ | Cluster vertex z |
| L3TauE | Cluster energy |
| L3TauET | Cluster transverse energy |
| L3TauEta | Cluster pseudorapidity |
| L3Taueta | Cluster pseudorapidity w.r.t. vertex used by calorimeter clustering tool |
| L3Tauphi | Cluster phi |
| L3Tauemfr | The transverse energy fraction in EM layers |
| L3Tauprofile | Ratio of transverse energy of the sum of the two highest transverse energy towers in the cluster, and of the total cluster transverse energy |
| L3Tauwidth | Transverse energy-weighted cluster width |
| L3Tauem3E | Cluster E in EM3 layer |
| L3Tauem3eta | Cluster eta in EM3 layer |
| L3Tauem3phi | Cluster phi in EM3 layer |
| L3Tauntrks | Number of tracks pointing to the cal cluster if CAL_BASED, or number of tracks in track cluster if TRACK_BASED |
| L3Tauntrks3 | Number of matching tracks with pt>3GeV |
| L3Tausumpt | Sum of |pt| of matching tracks |
| L3Tausumpt3 | If TRACK_BASED and more than 3 matching tracks, sum of |pt| of those extra tracks |
| L3Tautrpt | Array of track pt (9999 for non-entries) |
| L3Tautreta | Array of track eta (99 for non-entries) |
| L3Tautrphi | Array of track phi (99 for non-entries) |
| L3Tautrzcal | Array of track z at magnet radius (999 for non-entries) |
| L3Tautrphical | Array of track phi at magnet radius (99 for non-entries) |
| L3Taum01 | If TRACK_BASED, invariant mass of first 2 tracks |
| L3Taum012 | If TRACK_BASED, invariant mass of first 3 tracks |
| L3Tauncps | Number of CPS clusters (matched around leading track) |
| L3TaucpsE | Array of CPS cluster energy (999 for non-entries) |
| L3Taucpsphi | Array of CPS cluster phi (99 for non-entries) |
| L3Taucpsz | Array of CPS cluster z (999 for non-entries) |