File indexing completed on 2024-04-06 12:31:35
0001 #include "TrackingTools/PatternTools/interface/TSCBLBuilderNoMaterial.h"
0002 #include "TrackingTools/AnalyticalJacobians/interface/AnalyticalCurvilinearJacobian.h"
0003 #include "TrackingTools/PatternTools/interface/TwoTrackMinimumDistance.h"
0004 #include "FWCore/MessageLogger/interface/MessageLogger.h"
0005
0006 using namespace std;
0007
0008 TrajectoryStateClosestToBeamLine TSCBLBuilderNoMaterial::operator()(const FreeTrajectoryState& originalFTS,
0009 const reco::BeamSpot& beamSpot) const {
0010 TwoTrackMinimumDistance ttmd;
0011 bool status = ttmd.calculate(
0012 originalFTS.parameters(),
0013 GlobalTrajectoryParameters(GlobalPoint(beamSpot.position().x(), beamSpot.position().y(), beamSpot.position().z()),
0014 GlobalVector(beamSpot.dxdz(), beamSpot.dydz(), 1.),
0015 0,
0016 &(originalFTS.parameters().magneticField())));
0017 if (!status) {
0018 LogDebug("TrackingTools|PatternTools")
0019 << "TSCBLBuilderNoMaterial: Failure in TTMD when searching for PCA of track to beamline.\n"
0020 << "TrajectoryStateClosestToBeamLine is now invalid.";
0021 return TrajectoryStateClosestToBeamLine();
0022 }
0023
0024 pair<GlobalPoint, GlobalPoint> points = ttmd.points();
0025
0026 GlobalPoint xTrack = points.first;
0027 GlobalVector pTrack = GlobalVector(
0028 GlobalVector::Cylindrical(originalFTS.momentum().perp(), ttmd.firstAngle(), originalFTS.momentum().z()));
0029
0030 double s = ttmd.pathLength().first;
0031
0032 FreeTrajectoryState theFTS;
0033 if (originalFTS.hasError()) {
0034 const AlgebraicSymMatrix55& errorMatrix = originalFTS.curvilinearError().matrix();
0035 AnalyticalCurvilinearJacobian curvilinJacobian(originalFTS.parameters(), xTrack, pTrack, s);
0036 const AlgebraicMatrix55& jacobian = curvilinJacobian.jacobian();
0037 CurvilinearTrajectoryError cte(ROOT::Math::Similarity(jacobian, errorMatrix));
0038
0039 theFTS = FreeTrajectoryState(
0040 GlobalTrajectoryParameters(xTrack, pTrack, originalFTS.charge(), &(originalFTS.parameters().magneticField())),
0041 cte);
0042 } else {
0043 theFTS = FreeTrajectoryState(
0044 GlobalTrajectoryParameters(xTrack, pTrack, originalFTS.charge(), &(originalFTS.parameters().magneticField())));
0045 }
0046 return TrajectoryStateClosestToBeamLine(theFTS, points.second, beamSpot);
0047 }
