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#ifndef _TwoTrackMinimumDistance_H_
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#define _TwoTrackMinimumDistance_H_
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#include "TrackingTools/PatternTools/interface/ClosestApproachOnHelices.h"
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#include "TrackingTools/PatternTools/interface/ClosestApproachInRPhi.h"
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#include "TrackingTools/PatternTools/interface/TwoTrackMinimumDistanceHelixHelix.h"
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#include "TrackingTools/PatternTools/interface/TwoTrackMinimumDistanceLineLine.h"
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#include "TrackingTools/PatternTools/interface/TwoTrackMinimumDistanceHelixLine.h"
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/**
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* General interface to calculate the PCA of two tracks.
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* According to the charge of the tracks, the correct algorithm is used:<ul>
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* <li> charged-charged: TwoTrackMinimumDistanceHelixHelix
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* <li> charged-neutral: TwoTrackMinimumDistanceHelixLine
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* <li> neutral-neutral: TwoTrackMinimumDistanceLineLine
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* </ul>
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*/
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class TwoTrackMinimumDistance : public ClosestApproachOnHelices {
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public:
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enum Mode { FastMode=0, SlowMode=1 };
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TwoTrackMinimumDistance( const Mode m=FastMode ) { theModus=m; status_ = false;};
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virtual bool calculate(const TrajectoryStateOnSurface & sta,
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const TrajectoryStateOnSurface & stb);
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virtual bool calculate(const FreeTrajectoryState & sta,
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const FreeTrajectoryState & stb);
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virtual bool calculate(const GlobalTrajectoryParameters & sta,
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const GlobalTrajectoryParameters & stb);
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virtual bool status() const {return status_;}
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/**
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* Returns the two PCA on the trajectories.
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*/
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virtual std::pair<GlobalPoint, GlobalPoint> points() const;
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/** arithmetic mean of the two points of closest approach */
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virtual GlobalPoint crossingPoint() const;
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/** distance between the two points of closest approach in 3D */
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virtual float distance() const;
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/**
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* Clone method
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*/
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virtual TwoTrackMinimumDistance * clone() const {
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return new TwoTrackMinimumDistance(* this);
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}
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double firstAngle() const;
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double secondAngle() const;
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std::pair <double, double> pathLength() const;
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private:
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enum Charge { hh, hl, ll };
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Mode theModus;
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mutable Charge theCharge;
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ClosestApproachInRPhi theIniAlgo;
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mutable TwoTrackMinimumDistanceHelixHelix theTTMDhh;
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mutable TwoTrackMinimumDistanceLineLine theTTMDll;
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mutable TwoTrackMinimumDistanceHelixLine theTTMDhl;
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bool status_;
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std::pair<GlobalPoint, GlobalPoint> points_;
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bool pointsLineLine(const GlobalTrajectoryParameters & sta,
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const GlobalTrajectoryParameters & stb);
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bool pointsHelixLine(const GlobalTrajectoryParameters & sta,
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const GlobalTrajectoryParameters & stb);
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bool pointsHelixHelix(const GlobalTrajectoryParameters & sta,
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const GlobalTrajectoryParameters & stb);
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};
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#endif
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