FastJet 3.0.2
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Class that helps perform 2-pronged boosted tagging using the "mass-drop" technique (with asymmetry cut) introduced by Jonathan Butterworth, Adam Davison, Mathieu Rubin and Gavin Salam in arXiv:0802.2470 in the context of a boosted Higgs search. More...
#include <fastjet/tools/MassDropTagger.hh>
Public Types | |
typedef MassDropTaggerStructure | StructureType |
the type of the associated structure | |
Public Member Functions | |
MassDropTagger (const double mu=0.67, const double ycut=0.09) | |
default ctor | |
virtual std::string | description () const |
returns a textual description of the tagger | |
virtual PseudoJet | result (const PseudoJet &jet) const |
runs the tagger on the given jet and returns the tagged PseudoJet if successful, a PseudoJet==0 otherwise (standard access is through operator()). | |
Protected Attributes | |
double | _mu |
double | _ycut |
Static Protected Attributes | |
static LimitedWarning | _warnings_nonca |
Class that helps perform 2-pronged boosted tagging using the "mass-drop" technique (with asymmetry cut) introduced by Jonathan Butterworth, Adam Davison, Mathieu Rubin and Gavin Salam in arXiv:0802.2470 in the context of a boosted Higgs search.
The tagger proceeds as follows:
0. start from a jet obtained from with the Cambridge/Aachen algorithm
1. undo the last step of the clustering step j -> j1 + j2 (label them such as j1 is the most massive).
2. if there is a mass drop, i.e. m_j1/m_j < mu_cut, and the splitting is sufficiently symmetric, , keep j as the result of the tagger (with j1 and j2 its 2 subjets)
3. otherwise, redefine j to be equal to j1 and return to step 1.
Note that in the original proposal, j1 and j2 are both required to be b-tagged and a filter (with Rfilt=min(0.3,Rbb/2) and n_filt=3) is also applied to j to obtain the final "Higgs candidate". See the example 12 - boosted Higgs tagging for details.
The constructor has the following arguments:
See also 12 - boosted Higgs tagging for a usage example.
Definition at line 90 of file MassDropTagger.hh.
runs the tagger on the given jet and returns the tagged PseudoJet if successful, a PseudoJet==0 otherwise (standard access is through operator()).
jet | the PseudoJet to tag |
Implements fastjet::Transformer.
Definition at line 54 of file MassDropTagger.cc.