FastJet 3.0.2
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Implementation of the MidPoint algorithm from CDF (plugin for fastjet-v2.1 upwards) More...
#include <fastjet/CDFMidPointPlugin.hh>
Public Types | |
enum | SplitMergeScale { SM_pt, SM_Et, SM_mt, SM_pttilde } |
the choice of scale to be used in the split-merge step | |
Public Member Functions | |
CDFMidPointPlugin (double seed_threshold_in, double cone_radius_in, double cone_area_fraction_in, int max_pair_size_in, int max_iterations_in, double overlap_threshold_in, SplitMergeScale sm_scale_in=SM_pt) | |
A CDFMidPointPlugin constructor that looks like the one provided by CDF. | |
CDFMidPointPlugin (double cone_radius_in, double overlap_threshold_in, double seed_threshold_in=1.0, double cone_area_fraction_in=1.0) | |
a compact constructor | |
double | seed_threshold () const |
double | cone_radius () const |
double | cone_area_fraction () const |
int | max_pair_size () const |
int | max_iterations () const |
double | overlap_threshold () const |
virtual std::string | description () const |
return a textual description of the jet-definition implemented in this plugin | |
virtual void | run_clustering (ClusterSequence &) const |
given a ClusterSequence that has been filled up with initial particles, the following function should fill up the rest of the ClusterSequence, using the following member functions of ClusterSequence: | |
virtual double | R () const |
the plugin mechanism's standard way of accessing the jet radius |
Implementation of the MidPoint algorithm from CDF (plugin for fastjet-v2.1 upwards)
A plugin for fastjet-v2.1 that provides an interface to the CDF midpoint algorithm
CDFMidPointPlugin is a plugin for fastjet (v2.1 upwards) that provides an interface to the CDF version of Run-II iterative cone algorithm with midpoint seeds (also known as the Iterative Legacy Cone Algorithm, ILCA).
The CDF code has been taken from Joey Huston's webpage http://www.pa.msu.edu/~huston/Les_Houches_2005/Les_Houches_SM.html
Note that the CDF midpoint code contains options that go beyond those described in the Tevatron run-II document (hep-ex/0005012), notably search-cones, as described in hep-ph/0111434, and midpoints bewteen multiplets of stable cones.
Additionally, the version of the CDF midpoint code distributed here has been modified by the FastJet authors, so as to allow one to choose the scale used in the split-merge step.
Definition at line 66 of file CDFMidPointPlugin.hh.
fastjet::CDFMidPointPlugin::CDFMidPointPlugin | ( | double | seed_threshold_in, |
double | cone_radius_in, | ||
double | cone_area_fraction_in, | ||
int | max_pair_size_in, | ||
int | max_iterations_in, | ||
double | overlap_threshold_in, | ||
SplitMergeScale | sm_scale_in = SM_pt |
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) | [inline] |
A CDFMidPointPlugin constructor that looks like the one provided by CDF.
Its arguments should have the following meaning:
. SM_pt: pt (default -- source of small IR safety issue in purely hadronic events)
. SM_Et: Et (not boost invariant, reduces to mt at zero rapidity and to pt and infinite rapidity)
. SM_mt: transverse mass = sqrt(m^2+pt^2)
Definition at line 111 of file CDFMidPointPlugin.hh.
fastjet::CDFMidPointPlugin::CDFMidPointPlugin | ( | double | cone_radius_in, |
double | overlap_threshold_in, | ||
double | seed_threshold_in = 1.0 , |
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double | cone_area_fraction_in = 1.0 |
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) | [inline] |
a compact constructor
NB: as of version 2.4, the default value for the overlap_threshold threshold has been removed, to avoid misleading people into using the value of 0.5 without thinking, which is known to have adverse effects in high-noise environments. A recommended value is 0.75.
Definition at line 134 of file CDFMidPointPlugin.hh.
void fastjet::CDFMidPointPlugin::run_clustering | ( | ClusterSequence & | ) | const [virtual] |
given a ClusterSequence that has been filled up with initial particles, the following function should fill up the rest of the ClusterSequence, using the following member functions of ClusterSequence:
Implements fastjet::JetDefinition::Plugin.
Definition at line 87 of file CDFMidPointPlugin.cc.