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#ifndef Alignment_TwoBodyDecay_TwoBodyDecayParameters_h
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#define Alignment_TwoBodyDecay_TwoBodyDecayParameters_h
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/** /class TwoBodyDecayParameters
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*
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* This class provides the definition and a container for the parameters
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* describing a two-body decay.
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*
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* /author Edmund Widl
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*/
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#include "DataFormats/CLHEP/interface/AlgebraicObjects.h"
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class TwoBodyDecayParameters
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{
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public:
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/// Define order of parameters
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enum ParameterName { x = 0, y = 1, z = 2, px = 3, py = 4, pz = 5, theta = 6, phi = 7, mass = 8 };
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enum { dimension = 9 };
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TwoBodyDecayParameters( void ) :
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theParameters( AlgebraicVector() ), theCovariance( AlgebraicSymMatrix() ) {}
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TwoBodyDecayParameters( const AlgebraicVector & param, const AlgebraicSymMatrix & cov ) :
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theParameters( param ), theCovariance( cov ) {}
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TwoBodyDecayParameters( AlgebraicVector param ) :
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theParameters( param ), theCovariance( AlgebraicSymMatrix() ) {}
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TwoBodyDecayParameters( const TwoBodyDecayParameters & other ) :
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theParameters( other.parameters() ), theCovariance( other.covariance() ) {}
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~TwoBodyDecayParameters( void ) {}
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/// Get decay parameters.
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inline const AlgebraicVector & parameters( void ) const { return theParameters; }
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/// Get error matrix.
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inline const AlgebraicSymMatrix & covariance( void ) const { return theCovariance; }
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/// Get specified decay parameter.
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inline const double operator[]( ParameterName name ) const { return theParameters[name]; }
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/// Get specified decay parameter.
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inline const double operator()( ParameterName name ) const { return theParameters[name]; }
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/// Get specified range of decay parameters.
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inline const AlgebraicVector sub( ParameterName first, ParameterName last ) const { return theParameters.sub( first+1, last+1 ); }
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inline const bool hasError( void ) const { return ( theCovariance.num_row() != 0 ); }
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private:
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AlgebraicVector theParameters;
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AlgebraicSymMatrix theCovariance;
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};
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#endif
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