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File indexing completed on 2021-02-14 14:31:52

0001 #include "TrackingTools/TrajectoryState/interface/TrajectoryStateTransform.h"
0002 #include "DataFormats/TrackReco/interface/Track.h"
0003 #include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
0004 #include "TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h"
0005 #include "DataFormats/GeometrySurface/interface/Surface.h"
0006 #include "TrackingTools/TrajectoryParametrization/interface/GlobalTrajectoryParameters.h"
0007 #include "Geometry/CommonDetUnit/interface/TrackingGeometry.h"
0008 #include "Geometry/CommonDetUnit/interface/GeomDet.h"
0009 
0010 namespace trajectoryStateTransform {
0011 
0012   using namespace SurfaceSideDefinition;
0013 
0014   PTrajectoryStateOnDet persistentState(const TrajectoryStateOnSurface& ts, unsigned int detid) {
0015     int surfaceSide = static_cast<int>(ts.surfaceSide());
0016     auto pt = ts.globalMomentum().perp();
0017 
0018     if (ts.hasError()) {
0019       AlgebraicSymMatrix55 const& m = ts.localError().matrix();
0020 
0021       int dim = 5;  /// should check if corresponds to m
0022       float localErrors[15];
0023 
0024       int k = 0;
0025       for (int i = 0; i < dim; i++) {
0026         for (int j = 0; j <= i; j++) {
0027           localErrors[k++] = m(i, j);
0028         }
0029       }
0030       return PTrajectoryStateOnDet(ts.localParameters(), pt, localErrors, detid, surfaceSide);
0031     }
0032     return PTrajectoryStateOnDet(ts.localParameters(), pt, detid, surfaceSide);
0033   }
0034 
0035   TrajectoryStateOnSurface transientState(const PTrajectoryStateOnDet& ts,
0036                                           const Surface* surface,
0037                                           const MagneticField* field) {
0038     AlgebraicSymMatrix55 m;
0039     bool errInv = true;
0040     if (ts.hasError()) {
0041       errInv = false;
0042       int dim = 5;
0043       int k = 0;
0044       for (int i = 0; i < dim; i++) {
0045         for (int j = 0; j <= i; j++) {
0046           m(i, j) = ts.error(k++);  // NOTE: here we do a cast float => double.
0047         }
0048       }
0049     }
0050 
0051     return TrajectoryStateOnSurface(ts.parameters(),
0052                                     errInv ? LocalTrajectoryError(InvalidError()) : LocalTrajectoryError(m),
0053                                     *surface,
0054                                     field,
0055                                     static_cast<SurfaceSide>(ts.surfaceSide()));
0056   }
0057 
0058   FreeTrajectoryState initialFreeState(const reco::Track& tk, const MagneticField* field, bool withErr) {
0059     Basic3DVector<float> pos(tk.vertex());
0060     GlobalPoint gpos(pos);
0061     Basic3DVector<float> mom(tk.momentum());
0062     GlobalVector gmom(mom);
0063     GlobalTrajectoryParameters par(gpos, gmom, tk.charge(), field);
0064     if (!withErr)
0065       return FreeTrajectoryState(par);
0066     CurvilinearTrajectoryError err(tk.covariance());
0067     return FreeTrajectoryState(par, err);
0068   }
0069 
0070   FreeTrajectoryState initialFreeStateL1TTrack(const TTTrack<Ref_Phase2TrackerDigi_>& tk,
0071                                                const MagneticField* field,
0072                                                bool withErr) {
0073     Basic3DVector<float> pos(tk.POCA());
0074     GlobalPoint gpos(pos);
0075     GlobalVector gmom = tk.momentum();
0076     int charge = tk.rInv() > 0.f ? 1 : -1;
0077 
0078     GlobalTrajectoryParameters par(gpos, gmom, charge, field);
0079     if (!withErr)
0080       return FreeTrajectoryState(par);
0081     AlgebraicSymMatrix55 mat = AlgebraicMatrixID();
0082     mat *= 1e-8;
0083     return FreeTrajectoryState(par, mat);
0084   }
0085 
0086   FreeTrajectoryState innerFreeState(const reco::Track& tk, const MagneticField* field, bool withErr) {
0087     Basic3DVector<float> pos(tk.innerPosition());
0088     GlobalPoint gpos(pos);
0089     Basic3DVector<float> mom(tk.innerMomentum());
0090     GlobalVector gmom(mom);
0091     GlobalTrajectoryParameters par(gpos, gmom, tk.charge(), field);
0092     if (!withErr)
0093       return FreeTrajectoryState(par);
0094     CurvilinearTrajectoryError err(tk.extra()->innerStateCovariance());
0095     return FreeTrajectoryState(par, err);
0096   }
0097 
0098   FreeTrajectoryState outerFreeState(const reco::Track& tk, const MagneticField* field, bool withErr) {
0099     Basic3DVector<float> pos(tk.outerPosition());
0100     GlobalPoint gpos(pos);
0101     Basic3DVector<float> mom(tk.outerMomentum());
0102     GlobalVector gmom(mom);
0103     GlobalTrajectoryParameters par(gpos, gmom, tk.charge(), field);
0104     if (!withErr)
0105       return FreeTrajectoryState(par);
0106     CurvilinearTrajectoryError err(tk.extra()->outerStateCovariance());
0107     return FreeTrajectoryState(par, err);
0108   }
0109 
0110   TrajectoryStateOnSurface innerStateOnSurface(const reco::Track& tk,
0111                                                const TrackingGeometry& geom,
0112                                                const MagneticField* field,
0113                                                bool withErr) {
0114     const Surface& surface = geom.idToDet(DetId(tk.extra()->innerDetId()))->surface();
0115     return TrajectoryStateOnSurface(innerFreeState(tk, field, withErr), surface);
0116   }
0117 
0118   TrajectoryStateOnSurface outerStateOnSurface(const reco::Track& tk,
0119                                                const TrackingGeometry& geom,
0120                                                const MagneticField* field,
0121                                                bool withErr) {
0122     const Surface& surface = geom.idToDet(DetId(tk.extra()->outerDetId()))->surface();
0123     return TrajectoryStateOnSurface(outerFreeState(tk, field, withErr), surface);
0124   }
0125 
0126 }  // namespace trajectoryStateTransform