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#ifndef Alignment_CommonAlignmentAlgorithm_AlignmentTwoBodyDecayTrackSelector_h
#define Alignment_CommonAlignmentAlgorithm_AlignmentTwoBodyDecayTrackSelector_h
//Framework
#include "FWCore/Framework/interface/ConsumesCollector.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/ParameterSet/interface/ParameterSetDescription.h"
#include "FWCore/Utilities/interface/EDGetToken.h"
//STL
#include <vector>
// forward declaration:
#include <DataFormats/TrackReco/interface/TrackFwd.h>
#include <DataFormats/METReco/interface/CaloMETFwd.h>
namespace edm {
class Event;
class EventSetup;
} // namespace edm
class AlignmentTwoBodyDecayTrackSelector {
public:
typedef std::vector<const reco::Track*> Tracks;
/// constructor
AlignmentTwoBodyDecayTrackSelector(const edm::ParameterSet& cfg, edm::ConsumesCollector& iC);
/// destructor
~AlignmentTwoBodyDecayTrackSelector();
/// select tracks
Tracks select(const Tracks& tracks, const edm::Event& iEvent, const edm::EventSetup& iSetup);
bool useThisFilter();
static void fillPSetDescription(edm::ParameterSetDescription& desc);
private:
///checks if the mass of the mother is in the mass region
Tracks checkMass(const Tracks& cands) const;
///checks if the mass of the mother is in the mass region adding missing E_T
Tracks checkMETMass(const Tracks& cands, const edm::Event& iEvent) const;
///checks if the mother has charge = [theCharge]
bool checkCharge(const reco::Track* trk1, const reco::Track* trk2 = nullptr) const;
///checks if the [cands] are acoplanar (returns empty set if not)
bool checkAcoplanarity(const reco::Track* trk1, const reco::Track* trk2) const;
///checks if [cands] contains a acoplanar track w.r.t missing ET (returns empty set if not)
bool checkMETAcoplanarity(const reco::Track* trk, const reco::CaloMET* met) const;
/// private data members
//settings from conigfile
bool theMassrangeSwitch;
bool theChargeSwitch;
bool theMissingETSwitch;
bool theAcoplanarityFilterSwitch;
//inv mass Cut
double theMinMass;
double theMaxMass;
double theDaughterMass;
unsigned int theCandNumber;
bool secThrBool;
double thesecThr;
//charge filter
int theCharge;
bool theUnsignedSwitch;
//missing ET Filter
edm::EDGetTokenT<reco::CaloMETCollection> theMissingETToken;
//acoplanarity Filter
double theAcoplanarDistance;
//helpers
///print Information on Track-Collection
void printTracks(const Tracks& col) const;
};
#endif
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