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/* File TopTopologicalVariables.hpp
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*
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* Created : Tue Oct 4 16:58:28 CDT 2005
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* Author : Supriya JAIN, sjain@fnal.gov
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*
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* Purpose : Class containing generic methods for
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* calculating topological variables
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* (Instantiate using as argument: vector<TMBLorentzVector>
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* of all objects for which you want any variable
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* to be calculated)
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*
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* Last modified : Amnon Harel, 06 Mar 2006 (const correctness, cache eigenvalues)
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* Comments :
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*/
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#ifndef TopTopologicalVariables_HPP_
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#define TopTopologicalVariables_HPP_
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#include <vector>
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#include "LJMet/MultivariateAnalysis/interface/TMBLorentzVector.h"
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namespace top_cafe {
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class TopTopologicalVariables {
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/**
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Contains generic methods for calculating topological variables
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Constructor takes most containers (vector, list, Collection, etc.)
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of any object derived from TMBLorentzVector
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*/
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public:
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// Constructor, destructor:
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template<class Container>
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TopTopologicalVariables(const Container& objects)
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: _pv (0)
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{
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copy(objects.begin(), objects.end(), back_inserter(_myobjects));
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}
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~TopTopologicalVariables();
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TopTopologicalVariables& operator= (const TopTopologicalVariables& that);
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TopTopologicalVariables(const TopTopologicalVariables& that);
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// Lambdas (eigen vectors of momentum tensor) and their combinations:
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TVectorD GetMomentumTensorEigenvalues() const;
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double Aplanarity() const;
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double Sphericity() const;
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double C() const;
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double D() const;
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double Centrality() const;
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double Pt() const;
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double Ht() const;
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double H() const;
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double TransverseMass() const;
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double M() const;
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double Mt() const;
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double GeometricMeanPt() const;
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double WeightedEtaRMS() const;
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double MinimumPairMass() const;
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double CosThetaStar() const;
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double CosThetaStarJustZ() const;
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double SoftestPt() const;
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double MinDR() const;
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double MaxDR() const;
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// Note: this is the minimal relative momentum between two objects,
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// a clean variation of KtMin. As for Ktmin, the user is
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// encouraged to divide by an energy and get PtrelMinPrime
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double PtrelMin() const;
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// Note: this is KtMin, **NOT** KtMinPrime
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// User needs to divide by his/her favorite energy variable to get
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// KtMinPrime
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double KtMin() const;
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private:
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typedef std::vector<TMBLorentzVector>::const_iterator Iterator;
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std::vector<TMBLorentzVector> _myobjects;
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mutable TVectorD *_pv; // internal representation: can change even for a const object
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void ensurePV() const; // will calculate the eigen values (_pv) if it hasn't been done yet
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};
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} // namespace top_cafe
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#endif
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