JacobianLocalToCurvilinear.cc

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#include "TrackingTools/AnalyticalJacobians/interface/JacobianLocalToCurvilinear.h"
#include "DataFormats/GeometrySurface/interface/Surface.h"
#include "TrackingTools/TrajectoryParametrization/interface/LocalTrajectoryParameters.h"
#include "TrackingTools/TrajectoryParametrization/interface/GlobalTrajectoryParameters.h"

#include "MagneticField/Engine/interface/MagneticField.h"

JacobianLocalToCurvilinear::
JacobianLocalToCurvilinear(const Surface& surface, 
               const LocalTrajectoryParameters& localParameters,
               const MagneticField& magField) : theJacobian(ROOT::Math::SMatrixNoInit()) {
  

  GlobalPoint  x = surface.toGlobal(localParameters.position());
  GlobalVector h  = magField.inInverseGeV(x);
  GlobalVector hq = h*localParameters.signedInverseMomentum();  // changed sign

 
  LocalVector tnl = localParameters.direction();
  GlobalVector tn = surface.toGlobal(tnl);
 
  Surface::RotationType const & rot = surface.rotation();

  compute(rot, tnl, tn, hq);
}

JacobianLocalToCurvilinear::
JacobianLocalToCurvilinear(const Surface& surface, 
               const LocalTrajectoryParameters& localParameters,
               const GlobalTrajectoryParameters& globalParameters,
               const MagneticField& magField) : theJacobian(ROOT::Math::SMatrixNoInit()) {

  GlobalVector h  = globalParameters.magneticFieldInInverseGeV();
  GlobalVector hq = h*localParameters.signedInverseMomentum();  // changed sign

 
  LocalVector tnl = localParameters.direction();
  GlobalVector tn = surface.toGlobal(tnl);  // globalParameters.momentum().unit();
 
  Surface::RotationType const & rot = surface.rotation();

  compute(rot, tnl, tn, hq);
}
 

void JacobianLocalToCurvilinear::compute(Surface::RotationType const & rot, LocalVector const & tnl,  GlobalVector  const & tn, GlobalVector const & hq) {
  // Origin: TRSDSC

  GlobalVector dj(rot.x());
  GlobalVector dk(rot.y());
 
  // rotate coordinates because of wrong coordinate system in orca
  double tvwX=tnl.z(), tvwY=tnl.x(), tvwZ=tnl.y();
  double cosl = tn.perp(); if (cosl < 1.e-30) cosl = 1.e-30;
  double cosl1 = 1./cosl;


  GlobalVector un(-tn.y()*cosl1, tn.x()*cosl1, 0.);
  double uj = un.dot(dj);
  double uk = un.dot(dk);
  double sinz =-un.dot(hq);

  GlobalVector vn(-tn.z()*un.y(), tn.z()*un.x(), cosl);
  double vj = vn.dot(dj);
  double vk = vn.dot(dk);
  double cosz = vn.dot(hq);
 

  theJacobian(0,0) = 1.; for (auto i=1;i<5; ++i) theJacobian(0,i)=0.;

  theJacobian(1,0) = 0.;
  theJacobian(2,0) = 0.;

  theJacobian(1,1) = tvwX*vj;
  theJacobian(1,2) = tvwX*vk;
  theJacobian(2,1) = tvwX*uj*cosl1;
  theJacobian(2,2) = tvwX*uk*cosl1;

  for (auto i=0;i<3; ++i) { theJacobian(3,i)=0.; theJacobian(4,i)=0.; }

  theJacobian(3,3) = uj;
  theJacobian(3,4) = uk;
  theJacobian(4,3) = vj;
  theJacobian(4,4) = vk;
 
  theJacobian(1,3) = tvwY*sinz;
  theJacobian(1,4) = tvwZ*sinz;
  theJacobian(2,3) = tvwY*(cosz*cosl1);
  theJacobian(2,4) = tvwZ*(cosz*cosl1);
  // end of TRSDSC

  //dbg::dbg_trace(1,"Loc2Cu", localParameters.vector(),x,dj,dk,theJacobian);
}