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#ifndef Alignment_TwoBodyDecay_TwoBodyDecayEstimator_h
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#define Alignment_TwoBodyDecay_TwoBodyDecayEstimator_h
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#include "Alignment/TwoBodyDecay/interface/TwoBodyDecay.h"
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#include "Alignment/TwoBodyDecay/interface/TwoBodyDecayVirtualMeasurement.h"
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#include "RecoVertex/VertexTools/interface/PerigeeLinearizedTrackState.h"
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#include "DataFormats/CLHEP/interface/AlgebraicObjects.h"
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#include "FWCore/ParameterSet/interface/ParameterSet.h"
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/** Class TwoBodyDecayEstimator estimates the decay parameters and the corresponding error
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* matrix (see TwoBodyDecayParameter) from two linearized tracks, and an hypothesis for the
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* primary particle's mass and width as well as the mass of the secondary particles. It utilizes
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* a robust M-estimator.
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*
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* /author Edmund Widl
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*/
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class TwoBodyDecayEstimator
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{
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public:
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typedef PerigeeLinearizedTrackState::RefCountedLinearizedTrackState RefCountedLinearizedTrackState;
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TwoBodyDecayEstimator( const edm::ParameterSet & config );
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virtual ~TwoBodyDecayEstimator( void ) {}
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virtual TwoBodyDecay estimate( const std::vector< RefCountedLinearizedTrackState > & linTracks,
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const TwoBodyDecayParameters & linearizationPoint,
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const TwoBodyDecayVirtualMeasurement & vm ) const;
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inline const int ndf( void ) const { return theNdf; }
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inline const AlgebraicVector& pulls( void ) const { return thePulls; }
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virtual TwoBodyDecayEstimator* clone( void ) const { return new TwoBodyDecayEstimator( *this ); }
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protected:
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virtual bool constructMatrices( const std::vector< RefCountedLinearizedTrackState > & linTracks,
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const TwoBodyDecayParameters & linearizationPoint,
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const TwoBodyDecayVirtualMeasurement & vm,
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AlgebraicVector & vecM, AlgebraicSymMatrix & matG, AlgebraicMatrix & matA ) const;
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private:
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bool checkValues( const AlgebraicVector & vec ) const;
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double theRobustificationConstant;
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double theMaxIterDiff;
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int theMaxIterations;
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bool theUseInvariantMass;
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mutable int theNdf;
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mutable AlgebraicVector thePulls;
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};
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#endif
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