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#ifndef _Tracker_TwoTrackMinimumDistanceHelixHelix_H_
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#define _Tracker_TwoTrackMinimumDistanceHelixHelix_H_
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#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
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// #include <string>
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// #include <sstream>
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#include <utility>
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/** \class TwoTrackMinimumDistanceHelixHelix
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* This is a helper class for TwoTrackMinimumDistance.
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* No user should need direct access to this class.
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* It actually implements a Newton-Kantorowitsch method
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* for finding the minimum distance between two tracks.
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*/
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class GlobalTrajectoryParameters;
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class TwoTrackMinimumDistanceHelixHelix {
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public:
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TwoTrackMinimumDistanceHelixHelix();
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~TwoTrackMinimumDistanceHelixHelix();
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bool calculate( const GlobalTrajectoryParameters &,
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const GlobalTrajectoryParameters &,
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const float qual=.001 ); // retval=true? error occured.
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std::pair <GlobalPoint, GlobalPoint> points() const {
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if (!pointsUpdated) finalPoints();
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return std::pair<GlobalPoint, GlobalPoint> (pointG, pointH);
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}
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std::pair <double, double> pathLength() const {
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if (!pointsUpdated) finalPoints();
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return std::pair <double, double> ( pathG, pathH);
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}
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double firstAngle() const {return thepG;}
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double secondAngle() const {return thepH;}
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private:
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bool updateCoeffs( const GlobalPoint & , const GlobalPoint & );
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bool oneIteration ( double &, double & ) const;
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// bool parallelTracks () const;
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void finalPoints() const;
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private:
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GlobalTrajectoryParameters const *theH, *theG;
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// the 'GH-track data' (constants)
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double thea, theb, thec1, thec2, thed1, thed2, thee1, thee2, theg, theh;
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// double thelambdaG, thelambdaH;
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double thetanlambdaG, thetanlambdaH;
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double thesinpG0, thecospG0;
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double thesinpH0, thecospH0;
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double thepG0, thepH0;
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// the variable stuff
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// = the point we are currently looking at.
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mutable double thepG, thepH;
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mutable double thesinpG, thesinpH;
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mutable double thecospG, thecospH;
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mutable GlobalPoint pointG, pointH;
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mutable double pathG, pathH;
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mutable bool pointsUpdated;
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double themaxjump, thesingjacI;
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int themaxiter;
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};
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#endif
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