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/* $Id: TwoTrackMinimumDistanceLineLine.h,v 1.2 2008/05/02 19:52:24 burkett Exp $ */
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#ifndef _Tracker_TwoTrackMinimumDistanceLineLine_H_
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#define _Tracker_TwoTrackMinimumDistanceLineLine_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 TwoTrackMinimumDistanceLineLine
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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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* Exact solution.
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*/
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class GlobalTrajectoryParameters;
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class TwoTrackMinimumDistanceLineLine {
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public:
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/**
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* Calculates the point of closest approach on the two tracks.
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* \return false in case of success<br>
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* true in case of failure. Possible failures:<br>
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* - Either of the Trajectories are charged
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* - Either of the Trajectories is of zero momentum
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* - Trajectories are parallel
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*/
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bool calculate( const GlobalTrajectoryParameters &,
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const GlobalTrajectoryParameters &); // retval=true? error occured.
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std::pair <GlobalPoint, GlobalPoint> points() const;
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std::pair <double, double> pathLength() const;
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double firstAngle() const {return phiG;}
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double secondAngle() const {return phiH;}
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private:
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double phiH, phiG;
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double pathG, pathH;
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GlobalPoint gPos, hPos;
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};
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#endif
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