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LundPlane FastJet contrib
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The LundPlane FastJet contrib provides tools necessary to construct
the Lund Plane of a jet.
It is based on arXiv:1807.04758 by Frederic Dreyer, Gavin Salam, and
Gregory Soyez.
Azimuthal-angle definitions are taken from arXiv:2103.16526, by
Alexander Karlberg, Gavin Salam, Ludovic Scyboz and Rob Verheyen, and
arXiv:2111.01161 by the authors above and Keith Hamilton.
It provides the following C++ classes:
- LundDeclustering
Contains the declustering variables associated with a node on
the Lund plane.
- LundGenerator
A tool to generate a vector of LundDeclustering for a given jet
corresponding to its primary Lund plane.
- RecursiveLundEEGenerator
A recursive tool to extract declusterings for a given jet in
e+e- collisions, i.e. its full Lund structure down to a user-given
depth
- LundWithSecondary
A tool to generate primary, and secondary, lund planes of a jet
according to the definition given as input.
- SecondaryLund, SecondaryLund_{mMDT|dotmMDT|Mass}
Provides a definition for the leading emission.
There are four C++ examples which can be compiled with
> make example example_secondary example_dpsi_collinear example_dpsi_slice
The example program can be run using
> ./example < ../data/single-event.dat
and will output the primary lund plane declusterings as well as
generating a jets.json file, which can be read by a python script:
> python3 ./example.py
Some python classes to assist with reading and processing the json file
are provided in the read_lund_json.py module.
The example_secondary program outputs both the primary and secondary
Lund plane declusterings to screen, and can be run with:
> ./example_secondary < ../data/single-event.dat
The example_dpsi_collinear and example_dpsi_slice programs compute the
contribution to the collinear azimuthal delta_psi observable from
2103.16526, and to the slice observable delta_psi_slice from 2111.01161,
respectively. They can be run with
> ./example_dpsi_collinear < ../data/single-ee-event.dat
> ./example_dpsi_slice < ../data/single-ee-event.dat

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