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#define private public
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#include "TrackingTools/PatternTools/interface/ClosestApproachInRPhi.h"
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#include "TrackingTools/PatternTools/interface/TwoTrackMinimumDistanceHelixHelix.h"
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#undef private
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// #include "DataFormats/GeometrySurface/interface/BoundPlane.h"
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#include "MagneticField/Engine/interface/MagneticField.h"
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// #include "TrackingTools/TrajectoryState/interface/BasicSingleTrajectoryState.h"
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#include "TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h"
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#include <iostream>
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class ConstMagneticField : public MagneticField {
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public:
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virtual GlobalVector inTesla ( const GlobalPoint& ) const {
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return GlobalVector(0,0,4);
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}
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};
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namespace {
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inline GlobalPoint mean ( std::pair<GlobalPoint, GlobalPoint> pr ) {
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return GlobalPoint ( 0.5*(pr.first.basicVector() + pr.second.basicVector()) );
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}
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inline double dist ( std::pair<GlobalPoint, GlobalPoint> pr ) {
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return ( pr.first - pr.second ).mag();
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}
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}
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void compute(GlobalTrajectoryParameters const & gtp1, GlobalTrajectoryParameters const & gtp2) {
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ClosestApproachInRPhi ca;
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TwoTrackMinimumDistanceHelixHelix TTMDhh;
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std::cout << "CAIR" << std::endl;
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bool ok = ca.calculate(gtp1,gtp2);
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if(!ok)
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std::cout << "no intercept!" << std::endl;
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else {
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std::cout << "distance, xpoint " << ca.distance() << ca.crossingPoint() << std::endl;
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std::pair <GlobalTrajectoryParameters, GlobalTrajectoryParameters > tca = ca.trajectoryParameters();
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std::cout << tca.first << std::endl;
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std::cout << tca.second << std::endl;
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}
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std::cout << "TTMDhh" << std::endl;
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bool nok = TTMDhh.calculate(gtp1,gtp2,.0001);
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if(nok)
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std::cout << "no intercept!" << std::endl;
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else {
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std::pair<GlobalPoint, GlobalPoint> pr = TTMDhh.points();
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std::cout << "distance, xpoint " << dist(pr) << mean(pr) << std::endl;
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// std::pair <GlobalTrajectoryParameters, GlobalTrajectoryParameters > thh = TTMDhh.trajectoryParameters();
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// std::cout << thh.first << std::endl;
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// std::cout << thh.second << std::endl;
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}
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}
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int main() {
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MagneticField * field = new ConstMagneticField;
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{
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// going back and forth gtp2 should be identical to gpt1....
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GlobalPoint gp1(1,0,0);
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GlobalVector gv1(1,1,-1);
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GlobalTrajectoryParameters gtp1(gp1,gv1,1,field);
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double bz = field->inTesla(gp1).z() * 2.99792458e-3;
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GlobalPoint np(0.504471, -0.498494, 0.497014);
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GlobalTrajectoryParameters gtpN = ClosestApproachInRPhi::newTrajectory(np,gtp1,bz);
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GlobalTrajectoryParameters gtp2 = ClosestApproachInRPhi::newTrajectory(gp1,gtpN,bz);
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std::cout << gtp1 << std::endl;
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std::cout << gtpN << std::endl;
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std::cout << gtp2 << std::endl;
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std::cout << std::endl;
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}
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{
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std::cout <<"opposite sign, same direction, same origin: the two circles are tangent to each other at gp1\n" << std::endl;
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GlobalPoint gp1(0,0,0);
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GlobalVector gv1(1,1,1);
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GlobalTrajectoryParameters gtp1(gp1,gv1,1,field);
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GlobalPoint gp2(0,0,0);
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GlobalVector gv2(1,1,-1);
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GlobalTrajectoryParameters gtp2(gp2,gv2,-1,field);
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compute(gtp1,gtp2);
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std::cout << std::endl;
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}
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{
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std::cout <<" not crossing: the pcas are on the line connecting the two centers\n"
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<<"the momenta at the respective pcas shall be parallel as they are perpendicular to the same line\n"
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<<"(the one connecting the two centers)\n" << std::endl;
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GlobalPoint gp1(-1,0,0);
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GlobalVector gv1(1,1,1);
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GlobalTrajectoryParameters gtp1(gp1,gv1,-1,field);
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GlobalPoint gp2(1,0,0);
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GlobalVector gv2(1,1,-1);
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GlobalTrajectoryParameters gtp2(gp2,gv2,1,field);
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compute(gtp1,gtp2);
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std::cout << std::endl;
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}
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{
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std::cout <<"crossing (only opposite changes w.r.t. previous)\n" << std::endl;
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GlobalPoint gp1(-1,0,0);
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GlobalVector gv1(1,1,1);
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GlobalTrajectoryParameters gtp1(gp1,gv1,1,field);
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GlobalPoint gp2(1,0,0);
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GlobalVector gv2(1,1,-1);
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GlobalTrajectoryParameters gtp2(gp2,gv2,-1,field);
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compute(gtp1,gtp2);
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std::cout << std::endl;
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}
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{
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std::cout <<"crossing\n" << std::endl;
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GlobalPoint gp1(-1,0,0);
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GlobalVector gv1(1,1,1);
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GlobalTrajectoryParameters gtp1(gp1,gv1,-1,field);
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GlobalPoint gp2(1,0,0);
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GlobalVector gv2(-1,1,-1);
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GlobalTrajectoryParameters gtp2(gp2,gv2,1,field);
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compute(gtp1,gtp2);
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std::cout << std::endl;
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}
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return 0;
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}
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