Level 3 Jet Tool - Documentation
Last update: 23-Oct-2000
This page gives a short overview of L3TJet.
For more detailed documentation please take a look at
this note.
Algorithms:
- Simple Cone Clustering: Clusters as found by
L3TCalCluster will be taken as is.
- kt Clustering: Two methods (Ellis+Soper as well
as Catani) are implemented according to the prescriptions used offline.
Results (as currently available in DebugBlock of l3fanalyze):
- L3DJn: Number of jets above Et threshold.
- L3DJet: Jet Et (wrt primary vertex).
- L3DJemfr: Et fraction in EM layers.
- L3DJimfr: Et fraction in ICD/MG layers.
- L3DJchfr: Et fraction in CH layers.
- L3DJpx: Jet px.
- L3DJpy: Jet py.
- L3DJpz: Jet pz.
- L3DJeta: Jet eta (wrt primary vertex).
- L3DJphi: Jet phi.
Note that the prefix L3DJ is set in l3fanalyze/rcp/proto_L3JetsDebugInfoExaminer.rcp.
Tool Parameters (passed in via trigger list, for a list check the
Database):
- calclus: the reference to the cal clustering
tool - this defines the (pre-)clustering for the jets.
- vertex: the reference to the (primary) vertex tool. The best primary
vertex candidate found with this tool will be used to calculate Et
and Eta of jets. [Warning: currently not implemented! Please
specify the vertex in the cal clustering tool instead.]
- algorithm: "SC" for Simple Cone, "ES" for
kt-Ellis+Soper, "CT" for kt-Catani.
- MinEt: Only jets with Et above threshold
will be returned.
- MinPreEt: Only preclusters with Et above
threshold will be considered by L3TJet (kt-algorithms only).
- ES_R: Ellis+Soper normalisation scale,
enters into the metric squared (kt-ES only).
- kt_cut: kt cutoff on the kt-distance,
i.e. in GeV*GeV (kt-CT only).
RCP Switches:
These pages are maintained by
Volker Buescher