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#ifndef CollinearFitAtTM2_h_
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#define CollinearFitAtTM2_h_
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#include "TrackingTools/PatternTools/interface/TrajectoryMeasurement.h"
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#include "DataFormats/GeometryCommonDetAlgo/interface/Measurement1D.h"
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#include "DataFormats/Math/interface/Vector.h"
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#include "DataFormats/Math/interface/Error.h"
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// #include "Workspace/TrajectoryMeasurementFits/interface/RandomVector.h"
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/** Constrained fit at a TrajectoryMeasurement assuming collinearity
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* of incoming / outgoing momenta. The result of the fit is a vector
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* of 6 variables: the first five correspond to local trajectory
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* parameters for the incoming momentum, the 6th is the estimated
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* remaining energy fraction (p_out / p_in). The NDF are 6 (4)
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* for a valid (invalid) RecHit. **/
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class CollinearFitAtTM2 {
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public:
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/// parameter indices in the result vector / covariance matrix
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enum { ParQpIn=0, ParQpOut, ParDxDz, ParDyDz, ParX, ParY };
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CollinearFitAtTM2 (const TrajectoryMeasurement& tm);
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CollinearFitAtTM2 (const AlgebraicVector5& fwdParameters,
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const AlgebraicSymMatrix55& fwdCovariance,
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const AlgebraicVector5& bwdParameters,
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const AlgebraicSymMatrix55& bwdCovariance,
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const LocalPoint& hitPosition,
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const LocalError& hitErrors);
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typedef ROOT::Math::SVector<double,6> ResultVector;
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typedef ROOT::Math::SMatrix<double,6,6,ROOT::Math::MatRepSym<double,6> > ResultMatrix;
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/// status of the fit
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bool valid () const {return valid_;}
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/// chi2
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double chi2 () const {return chi2_;}
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/// degrees of freedom
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int ndof () const {return ndof_;}
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/// vector of fitted parameters
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const ResultVector& parameters () const {return parameters_;}
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/// covariance matrix of fitted parameters
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const ResultMatrix& covariance () const {return covariance_;}
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/// estimated deltaP (out-in) from fit parameters
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Measurement1D deltaP () const;
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private:
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/// initialise the jacobian
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void initJacobian ();
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/// Perform the fit. Return value "true" for success.
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bool fit (const AlgebraicVector5& fwdParameters,
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const AlgebraicSymMatrix55& fwdCovariance,
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const AlgebraicVector5& bwdParameters,
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const AlgebraicSymMatrix55& bwdCovariance,
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const LocalPoint& hitPosition, const LocalError& hitErrors);
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private:
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ROOT::Math::SMatrix<double,12,6> jacobian_;
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ROOT::Math::SVector<double,12> measurements_;
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ROOT::Math::SMatrix<double,12,12,ROOT::Math::MatRepSym<double,12> > weightMatrix_;
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ROOT::Math::SVector<double,6> projectedMeasurements_;
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// RandomVector randomGenerator;
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bool valid_;
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ResultVector parameters_;
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ResultMatrix covariance_;
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double chi2_;
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int ndof_;
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};
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#endif
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