Starting from version 3 FastJet introduces a number of tools meant to facilitate the analysis of events and of jet substructure. A schematic view of these tools is provided below. In addition many other tools are available through the FastJet Contrib package.
Users of FastJet 2 can refer to this page, where a number of external codes implementing some of the same tools are described and linked to.
Native tools
| Tool | Available since FastJet version | Reference |
|---|---|---|
| Generic tools | ||
| Filter | 3.0 | arXiv:0802.2470 + Trimming (arXiv:0810.1304) [1] |
| Pruner | 3.0 | arXiv:0903.5081 [2] |
| Boost/Unboost | 3.0 | |
| Recluster | 3.1 | |
| Background estimation and subtraction | ||
| JetMedianBackgroundEstimator | 3.0 | [3] |
| GridMedianBackgroundEstimator | 3.0 | |
| Subtractor | 3.0 | |
| Taggers | ||
| MassDropTagger | 3.0 | arXiv:0802.2470 [4] |
| CASubJetTagger | 3.0 | arXiv:0906.0728 [5] |
| RestFrameNSubjettinessTagger | 3.0 | arXiv:1011.1493 |
| JHTopTagger | 3.0 | arXiv:0806.0848 |
- For older versions of FastJet use Filter.hh and Filter.cc for filtering and see the authors' web-site for trimming. See also see example/fastjet_boosted_higgs.cc in earlier versions of FastJet
- For earlier versions of FastJet, use the plugin from pruning authors' web site
- Superseeds the background estimation through ClusterSequenceArea in earlier versions of FastJet
- For older versions of fastjet, see example/fastjet_boosted_higgs.cc, which also illustrates the filtering step
- Use CASubJet.hh with older versions of FastJet
3rd party tools (external code)
A wide range of 3rd-party tools is available from the fastjet-contrib project (see list). A few tools exist only outside of fastjet-contrib:
| Code | Authors | Comment | Available in FastJet Contrib |
|---|---|---|---|
| Taggers | |||
| YSplitter | Butterworth, Cox and Forshaw | Just call the ClusterSequence::exclusive_subdmerge(...) method on your jet. | -- |
| HEPTopTagger | Plehn, Salam, Spannowsky and Takeuchi | based on arXiv:0910.5472 and arXiv:1006.2833 | N |
| multivariate W-jet | Cui, Han and Schwartz | arXiv:1012.2077 | N |
| Qjets | Ellis, Hornig, Krohn, Roy and Schwartz | arXiv:1201.1914 | N |
| TemplateTagger | Backovic, Juknevic and Perez | arXiv:1212.2978, based on arXiv:1006.2035 | N |
Native jet algorithms
| Algorithm | Available since FastJet version |
|---|---|
| longitudinally invariant kt | 1.0 |
| (inclusive) Cambridge/Aachen | 2.0 |
| anti-kt | 2.2 |
| gen-kt | 2.4 |
| e+e- kt and gen-kt | 2.4 |
Plugins
(some must be explicitly enabled at configure time)| Algorithm | Available since FastJet version | Comments |
|---|---|---|
| SISCone | 2.1 | |
| CDF MidPoint | 2.1 | [IR(3+1) unsafe, deprecated] |
| CDF JetClu | 2.1 | [IR(2+1) unsafe, deprecated] |
| PxCone (fortran 77) | 2.1 | [IR(3+1) unsafe, deprecated] |
| D0 Run II Cone | 2.4 | [IR(3+1) unsafe, deprecated] |
| ATLAS Cone algorithm | 2.4 | [IR(2+1) unsafe, deprecated] |
| CMS Cone algorithm | 2.4 | [Coll(3+1) unsafe, deprecated] |
| TrackJet | 2.4 | [Coll(3+1) unsafe, deprecated] |
| e+e- (spherical) SISCone | 2.4 | |
| e+e- JADE algorithm | 2.4 | |
| e+e- Cambridge algorithm | 2.4 | |
| Nested definitions | 2.4 | |
| D0 Run I Cone | 3.0 | [IR(2+1) unsafe, deprecated] |
| GridJet | 3.0 |