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#ifndef HemisphereAlgo_h
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#define HemisphereAlgo_h
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/* \class HemisphereAlgo
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*
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* Class that, given the 4-momenta of the objects in the event,
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* allows to split up the event into two "hemispheres" according
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* to different criteria (see below)/
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*
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* Authors: Luc Pape & Filip Moortgat Date: July 2005
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* Updated: July 2006
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* Updated: 15 Sept 2006
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Transported to PAT by Wolfgang Adam and Tanja Rommerskirchen
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*
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*/
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#include "DataFormats/Candidate/interface/Candidate.h"
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#include <vector>
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#include <iostream>
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#include <cmath>
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class HemisphereAlgo {
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public:
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// There are 2 constructors:
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// 1. Constructor taking as argument vectors of Px, Py, Pz and E of the objects in
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// the event that should be separated, the seeding method and the hemisphere
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// association method,
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// 2. Constructor taking as argument vectors of Px, Py, Pz and E of the objects in
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// the event that should be separated. The seeding method and the hemisphere
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// association method should then be defined by SetMethod(seeding_method, association_method).
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//
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// Seeding method: choice of 2 inital axes
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// 1: 1st: max P ; 2nd: max P * delta R wrt first one
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// 2: 2 objects who give maximal invariant mass (recommended)
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//
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// HemisphereAlgo association method:
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// 1: maximum pt longitudinal projected on the axes
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// 2: minimal mass squared sum of the hemispheres
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// 3: minimal Lund distance (recommended)
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//
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// Note that SetMethod also allows the seeding and/or association method to be
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// redefined for an existing hemisphere object. The GetAxis or GetGrouping is
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// then recomputed using the newly defined methods.
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//
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HemisphereAlgo(const std::vector<reco::CandidatePtr>& componentRefs_, const int seed_method = 0, const int hemisphere_association_method = 0);
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// Destructor
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~HemisphereAlgo(){};
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std::vector<float> getAxis1(); // returns Nx, Ny, Nz, P, E of the axis of group 1
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std::vector<float> getAxis2(); // returns Nx, Ny, Nz, P, E of the axis of group 2
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// where Nx, Ny, Nz are the direction cosines e.g. Nx = Px/P,
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// P is the momentum, E is the energy
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std::vector<int> getGrouping(); // returns vector with "1" and "2"'s according to
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// which group the object belongs
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// (order of objects in vector is same as input)
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void SetMethod(int seed_method, int hemisphere_association_method){
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seed_meth = seed_method;
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hemi_meth = hemisphere_association_method;
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status = 0;
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} // sets or overwrites the seed and association methods
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void SetNoSeed(int object_number) {
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Object_Noseed[object_number] = 1;
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status = 0;
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}
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// prevents an object from being used as a seed
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// (method introduced on 15/09/06)
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private:
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int reconstruct(); // the hemisphere separation algorithm
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std::vector<reco::CandidatePtr> Object;
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std::vector<int> Object_Group;
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std::vector<int> Object_Noseed;
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std::vector<float> Axis1;
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std::vector<float> Axis2;
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//static const float hemivsn = 1.01;
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int seed_meth;
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int hemi_meth;
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int status;
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};
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#endif
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