ATLAS Offline Software
TrkV0VertexFitter.cxx
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1 /*
2  Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration
3 */
4 
5 /***************************************************************************
6  TrkV0VertexFitter.cxx - Description
7  ***************************************************************************/
8 #include "TrkV0Fitter/TrkV0VertexFitter.h"
9 #include "TrkDetDescrUtils/GeometryStatics.h"
10 #include "TrkExInterfaces/IExtrapolator.h"
11 #include "TrkParameters/TrackParameters.h"
12 #include "TrkSurfaces/CylinderSurface.h"
13 #include "TrkSurfaces/PerigeeSurface.h"
14 #include "VxVertex/VxTrackAtVertex.h"
15 #include "xAODTracking/TrackParticle.h"
16 #include "xAODTracking/TrackParticleContainer.h"
17 #include "xAODTracking/Vertex.h"
18 
19 #include "StoreGate/ReadCondHandle.h"
20 
21 /* These are some local helper classes only needed for convenience, therefore
22 within anonymous namespace. They contain temporary calculations of matrices
23 and vectors resulting from the vertex calculation. */
24 namespace
25 {
26  struct V0FitterTrack final
27  {
28  V0FitterTrack() : originalPerigee(nullptr), chi2(-1.) {}
29  ~V0FitterTrack() = default;
30  const Trk::TrackParameters * originalPerigee;
31  double chi2;
32  AmgVector(5) TrkPar;
33  AmgSymMatrix(5) Wi_mat;
34  };
35 }
36 
37 namespace Trk
38 {
39  TrkV0VertexFitter::TrkV0VertexFitter(const std::string& t, const std::string& n, const IInterface* p) : base_class(t,n,p),
40  m_maxIterations(10),
41  m_maxDchi2PerNdf(0.1),
42  m_maxR(2000.),
43  m_maxZ(5000.),
44  m_firstMeas(true),
45  m_deltaR(false),
46  m_extrapolator("Trk::Extrapolator/InDetExtrapolator", this)
47  {
48  declareProperty("MaxIterations", m_maxIterations);
49  declareProperty("MaxChi2PerNdf", m_maxDchi2PerNdf);
50  declareProperty("MaxR", m_maxR);
51  declareProperty("MaxZ", m_maxZ);
52  declareProperty("FirstMeasuredPoint", m_firstMeas);
53  declareProperty("Use_deltaR", m_deltaR);
54  declareProperty("Extrapolator", m_extrapolator);
55  declareInterface<IVertexFitter>(this);
56  }
57 
58  TrkV0VertexFitter::~TrkV0VertexFitter() = default;
59 
60  StatusCode TrkV0VertexFitter::initialize()
61  {
62  if ( m_extrapolator.retrieve().isFailure() ) {
63  ATH_MSG_FATAL("Failed to retrieve tool " << m_extrapolator);
64  return StatusCode::FAILURE;
65  }
66  ATH_MSG_DEBUG( "Retrieved tool " << m_extrapolator );
67 
68 
69  ATH_CHECK( m_fieldCacheCondObjInputKey.initialize() );
70 
71  ATH_MSG_DEBUG( "Initialize successful");
72  return StatusCode::SUCCESS;
73  }
74 
75  StatusCode TrkV0VertexFitter::finalize()
76  {
77  ATH_MSG_DEBUG( "Finalize successful" );
78  return StatusCode::SUCCESS;
79  }
80 
81 
83  xAOD::Vertex * TrkV0VertexFitter::fit(const std::vector<const xAOD::TrackParticle*>& vectorTrk,
84  const Amg::Vector3D& firstStartingPoint) const
85  {
86  std::vector<double> masses;
87  double constraintMass = -9999.;
88  xAOD::Vertex * pointingVertex = nullptr;
89  return fit(vectorTrk, masses, constraintMass, pointingVertex, firstStartingPoint);
90  }
91 
93  xAOD::Vertex * TrkV0VertexFitter::fit(const std::vector<const xAOD::TrackParticle*>& vectorTrk,
94  const xAOD::Vertex& firstStartingPoint) const
95  {
96  std::vector<double> masses;
97  double constraintMass = -9999.;
98  xAOD::Vertex * pointingVertex = nullptr;
99  const Amg::Vector3D& startingPoint = firstStartingPoint.position();
100  return fit(vectorTrk, masses, constraintMass, pointingVertex, startingPoint);
101  }
102 
104  xAOD::Vertex * TrkV0VertexFitter::fit(const std::vector<const xAOD::TrackParticle*>& vectorTrk) const
105  {
106  Amg::Vector3D tmpVtx;
107  tmpVtx.setZero();
108  return fit(vectorTrk, tmpVtx);
109  }
110 
112  xAOD::Vertex * TrkV0VertexFitter::fit(const std::vector<const xAOD::TrackParticle*> & vectorTrk,
113  const std::vector<double>& masses,
114  const double& constraintMass,
115  const xAOD::Vertex* pointingVertex,
116  const Amg::Vector3D& firstStartingPoint) const
117  {
118  const EventContext& ctx = Gaudi::Hive::currentContext();
119  std::vector<const Trk::TrackParameters*> measuredPerigees;
120  std::vector<const Trk::TrackParameters*> measuredPerigees_delete;
121  for (const xAOD::TrackParticle* p : vectorTrk)
122  {
123  if (m_firstMeas) {
124  unsigned int indexFMP;
125  if (p->indexOfParameterAtPosition(indexFMP, xAOD::FirstMeasurement)) {
126  measuredPerigees.push_back(new CurvilinearParameters(p->curvilinearParameters(indexFMP)));
127  ATH_MSG_DEBUG("first measurement on track exists");
128  ATH_MSG_DEBUG("first measurement " << p->curvilinearParameters(indexFMP));
129  ATH_MSG_DEBUG("first measurement covariance " << *(p->curvilinearParameters(indexFMP)).covariance());
130  } else {
131  Amg::Transform3D CylTrf;
132  CylTrf.setIdentity();
133  Trk::CylinderSurface estimationCylinder(CylTrf, p->radiusOfFirstHit(), 10e10);
134  const Trk::TrackParameters* chargeParameters = &p->perigeeParameters();
135  MaterialUpdateMode mode = Trk::removeNoise;
136  const Trk::TrackParameters* extrapolatedPerigee(nullptr);
137  extrapolatedPerigee = m_extrapolator->extrapolate(ctx,
138  *chargeParameters,
139  estimationCylinder,
140  Trk::alongMomentum,
141  true,
142  Trk::pion,
143  mode).release();
144  if (extrapolatedPerigee != nullptr) {
145  ATH_MSG_DEBUG("extrapolated to first measurement");
146  measuredPerigees.push_back (extrapolatedPerigee);
147  measuredPerigees_delete.push_back (extrapolatedPerigee);
148  } else {
149  extrapolatedPerigee =
150  m_extrapolator->extrapolateDirectly(ctx,
151  *chargeParameters,
152  estimationCylinder,
153  Trk::alongMomentum,
154  true,
155  Trk::pion).release();
156  if (extrapolatedPerigee != nullptr) {
157  ATH_MSG_DEBUG( "extrapolated (direct) to first measurement");
158  measuredPerigees.push_back (extrapolatedPerigee);
159  measuredPerigees_delete.push_back (extrapolatedPerigee);
160  } else {
161  ATH_MSG_DEBUG("Failed to extrapolate to the first measurement on track, using Perigee parameters");
162  measuredPerigees.push_back (&p->perigeeParameters());
163  }
164  }
165  }
166  } else {
167  measuredPerigees.push_back (&p->perigeeParameters());
168  }
169  }
170 
171  xAOD::Vertex * fittedVxCandidate = fit(measuredPerigees, masses, constraintMass, pointingVertex, firstStartingPoint);
172 
173  // assign the used tracks to the V0Candidate
174  if (fittedVxCandidate) {
175  for (const xAOD::TrackParticle* p : vectorTrk)
176  {
177  ElementLink<xAOD::TrackParticleContainer> el;
178  el.setElement(p);
179  fittedVxCandidate->addTrackAtVertex (el);
180  }
181  }
182 
183  for (const auto *ptr : measuredPerigees_delete){ delete ptr; }
184 
185  return fittedVxCandidate;
186  }
187 
188 
189 
191  xAOD::Vertex * TrkV0VertexFitter::fit(const std::vector<const Trk::TrackParameters*> & originalPerigees,
192  const Amg::Vector3D& firstStartingPoint) const
193  {
194  std::vector<double> masses;
195  double constraintMass = -9999.;
196  xAOD::Vertex * pointingVertex = nullptr;
197  return fit(originalPerigees, masses, constraintMass, pointingVertex, firstStartingPoint);
198  }
199 
201  xAOD::Vertex * TrkV0VertexFitter::fit(const std::vector<const Trk::TrackParameters*> & originalPerigees,
202  const xAOD::Vertex& firstStartingPoint) const
203  {
204  std::vector<double> masses;
205  double constraintMass = -9999.;
206  xAOD::Vertex * pointingVertex = nullptr;
207  const Amg::Vector3D& startingPoint = firstStartingPoint.position();
208  return fit(originalPerigees, masses, constraintMass, pointingVertex, startingPoint);
209  }
210 
212  xAOD::Vertex * TrkV0VertexFitter::fit(const std::vector<const Trk::TrackParameters*>& originalPerigees) const
213  {
214  Amg::Vector3D tmpVtx;
215  tmpVtx.setZero();
216  return fit(originalPerigees, tmpVtx);
217  }
218 
220  xAOD::Vertex * TrkV0VertexFitter::fit(const std::vector<const Trk::TrackParameters*>& originalPerigees,
221  const std::vector<double>& masses,
222  const double& constraintMass,
223  const xAOD::Vertex* pointingVertex,
224  const Amg::Vector3D& firstStartingPoint) const
225  {
226  const EventContext& ctx = Gaudi::Hive::currentContext();
227  if ( originalPerigees.empty() )
228  {
229  ATH_MSG_DEBUG("No tracks to fit in this event.");
230  return nullptr;
231  }
232 
233  // Initialisation of variables
234  bool pointingConstraint = false;
235  bool massConstraint = false;
236  if(constraintMass > -100.) massConstraint = true;
237  bool conversion = false;
238  if(constraintMass == 0. && originalPerigees.size() == 2) conversion = true;
239  double x_point=0., y_point=0., z_point=0.;
240  AmgSymMatrix(3) pointingVertexCov; pointingVertexCov.setIdentity();
241  if (pointingVertex != nullptr) {
242  if (pointingVertex->covariancePosition().trace() != 0.) {
243  pointingConstraint = true;
244  Amg::Vector3D pv = pointingVertex->position();
245  x_point = pv.x();
246  y_point = pv.y();
247  z_point = pv.z();
248  pointingVertexCov = pointingVertex->covariancePosition().inverse();
249  }
250  }
251 
252  if (msgLvl(MSG::DEBUG)) {
253  msg(MSG::DEBUG) << "massConstraint " << massConstraint << " pointingConstraint " << pointingConstraint << " conversion " << conversion << endmsg;
254  msg(MSG::DEBUG) << "V0Fitter called with: " << endmsg;
255  if (massConstraint && !masses.empty()) msg(MSG::DEBUG) << "mass constraint, V0Mass = " << constraintMass << " particle masses " << masses << endmsg;
256  if (pointingConstraint) msg(MSG::DEBUG) << "pointing constraint, x = " << x_point << " y = " << y_point << " z = " << z_point << endmsg;
257  }
258 
259  bool restartFit = true;
260  double chi2 = 2000000000000.;
261  unsigned int nTrk = originalPerigees.size(); // Number of tracks to fit
262  unsigned int nMeas = 5*nTrk; // Number of measurements
263  unsigned int nVert = 1; // Number of vertices
264 
265  unsigned int nCnst = 2*nTrk; // Number of constraint equations
266  unsigned int nPntC = 2; // Contribution from pointing constraint in 2D
267  unsigned int nMass = 1; // Contribution from mass constraint
268 
269  if (massConstraint) {
270  nCnst = nCnst + nMass;
271  }
272  if (pointingConstraint) {
273  nCnst = nCnst + nPntC;
274  nMeas = nMeas + 3;
275  nVert = nVert + 1;
276  }
277 
278  unsigned int nPar = 5*nTrk + 3*nVert; // Number of parameters
279  int ndf = nMeas - (nPar - nCnst); // Number of degrees of freedom
280  if (ndf < 0) {ndf = 1;}
281 
282  unsigned int dim = nCnst; //
283  unsigned int n_dim = nMeas; //
284 
285  ATH_MSG_DEBUG("ndf " << ndf << " n_dim " << n_dim << " dim " << dim);
286 
287  std::vector<V0FitterTrack> v0FitterTracks;
288 
289  Amg::VectorX Y_vec(n_dim); Y_vec.setZero();
290  Amg::VectorX Y0_vec(n_dim); Y0_vec.setZero();
291  Amg::Vector3D A_vec; A_vec.setZero();
292 
293  Amg::MatrixX Wmeas_mat(n_dim,n_dim); Wmeas_mat.setZero();
294  Amg::MatrixX Wmeas0_mat(n_dim,n_dim); Wmeas0_mat.setZero();
295  Amg::MatrixX Bjac_mat(dim,n_dim); Bjac_mat.setZero();
296  Amg::MatrixX Ajac_mat(dim,3); Ajac_mat.setZero();
297  Amg::MatrixX C11_mat(n_dim,n_dim); C11_mat.setZero();
298  Amg::MatrixX C22_mat(3,3); C22_mat.setZero();
299  Amg::MatrixX C21_mat(3,n_dim); C21_mat.setZero();
300  Amg::MatrixX C31_mat(dim,n_dim); C31_mat.setZero();
301  Amg::MatrixX C32_mat(dim,3); C32_mat.setZero();
302  Amg::MatrixX Wb_mat(dim,dim); Wb_mat.setZero();
303  Amg::MatrixX Btemp_mat(dim,n_dim); Btemp_mat.setZero();
304  Amg::MatrixX Atemp_mat(dim,3); Atemp_mat.setZero();
305  Amg::VectorX DeltaY_vec(n_dim); DeltaY_vec.setZero();
306  Amg::Vector3D DeltaA_vec; DeltaA_vec.setZero();
307  Amg::VectorX DeltaY0_vec(n_dim); DeltaY0_vec.setZero();
308  Amg::VectorX F_vec(dim); F_vec.setZero();
309  Amg::VectorX C_vec(dim); C_vec.setZero();
310  Amg::VectorX C_cor_vec(dim); C_cor_vec.setZero();
311  Amg::MatrixX V_mat(nPar,nPar); V_mat.setZero();
312  Amg::MatrixX Chi_vec(1,n_dim); Chi_vec.setZero();
313  AmgSymMatrix(1) Chi_mat; Chi_mat.setZero();
314  Amg::MatrixX ChiItr_vec(1,n_dim); ChiItr_vec.setZero();
315  AmgSymMatrix(1) ChiItr_mat; ChiItr_mat.setZero();
316  Amg::VectorX F_fac_vec(dim); F_fac_vec.setZero();
317 
318  const Amg::Vector3D * globalPosition = &(firstStartingPoint);
319  ATH_MSG_DEBUG("globalPosition of starting point: " << (*globalPosition)[0] << ", " << (*globalPosition)[1] << ", " << (*globalPosition)[2]);
320  if (globalPosition->perp() > m_maxR && globalPosition->z() > m_maxZ) return nullptr;
321 
322  SG::ReadCondHandle<AtlasFieldCacheCondObj> readHandle{m_fieldCacheCondObjInputKey, ctx};
323  if (!readHandle.isValid()) {
324  std::string msg = "Failed to retrieve magmnetic field conditions data ";
325  msg += m_fieldCacheCondObjInputKey.key();
326  throw std::runtime_error(msg);
327  }
328  const AtlasFieldCacheCondObj* fieldCondObj{*readHandle};
329 
330  MagField::AtlasFieldCache fieldCache;
331  fieldCondObj->getInitializedCache (fieldCache);
332 
333  // magnetic field
334  double BField[3];
335  fieldCache.getField(globalPosition->data(),BField);
336  double B_z = BField[2]*299.792; // should be in GeV/mm
337  if (B_z == 0. || std::isnan(B_z)) {
338  ATH_MSG_DEBUG("Could not find a magnetic field different from zero: very very strange");
339  B_z = 0.60407; // Value in GeV/mm (ATLAS units)
340  } else {
341  ATH_MSG_VERBOSE("Magnetic field projection of z axis in the perigee position is: " << B_z << " GeV/mm ");
342  }
343 // double B_z = 1.998*0.3;
344 
345 
346  v0FitterTracks.clear();
347  Trk::PerigeeSurface perigeeSurface(*globalPosition);
348  // Extrapolate the perigees to the startpoint of the fit
349  for (const Trk::TrackParameters* chargeParameters : originalPerigees)
350  {
351  if (chargeParameters != nullptr)
352  {
353  // Correct material changes
354  const Amg::Vector3D gMomentum = chargeParameters->momentum();
355  const Amg::Vector3D gDirection = chargeParameters->position() - *globalPosition;
356  const double extrapolationDirection = gMomentum.dot( gDirection );
357  MaterialUpdateMode mode = Trk::removeNoise;
358  if(extrapolationDirection > 0) mode = Trk::addNoise;
359  std::unique_ptr<const Trk::Perigee> extrapolatedPerigee(nullptr);
360  std::unique_ptr<const Trk::TrackParameters> tmp =
361  m_extrapolator->extrapolate(ctx,
362  *chargeParameters,
363  perigeeSurface,
364  Trk::anyDirection,
365  true,
366  Trk::pion,
367  mode);
368  //if of right type we want to pass ownership
369  if (tmp && tmp->associatedSurface().type() == Trk::SurfaceType::Perigee) {
370  extrapolatedPerigee.reset(static_cast<const Trk::Perigee*>(tmp.release()));
371  }
372 
373  if (extrapolatedPerigee == nullptr) {
374  ATH_MSG_DEBUG("Perigee was not extrapolated! Taking original one!");
375  const Trk::Perigee* tmpPerigee = dynamic_cast<const Trk::Perigee*>(chargeParameters);
376  if (tmpPerigee!=nullptr) extrapolatedPerigee = std::make_unique<Trk::Perigee>(*tmpPerigee);
377  else return nullptr;
378  }
379 
380  // store track parameters at starting point
381  V0FitterTrack locV0FitterTrack;
382  locV0FitterTrack.TrkPar[0] = extrapolatedPerigee->parameters()[Trk::d0];
383  locV0FitterTrack.TrkPar[1] = extrapolatedPerigee->parameters()[Trk::z0];
384  locV0FitterTrack.TrkPar[2] = extrapolatedPerigee->parameters()[Trk::phi];
385  locV0FitterTrack.TrkPar[3] = extrapolatedPerigee->parameters()[Trk::theta];
386  locV0FitterTrack.TrkPar[4] = extrapolatedPerigee->parameters()[Trk::qOverP];
387  locV0FitterTrack.Wi_mat = extrapolatedPerigee->covariance()->inverse().eval();
388  locV0FitterTrack.originalPerigee = chargeParameters;
389  v0FitterTracks.push_back(locV0FitterTrack);
390  } else {
391  ATH_MSG_DEBUG("Track parameters are not charged tracks ... fit aborted");
392  return nullptr;
393  }
394  }
395 
396  // Iterate fits until the fit criteria are met, or the number of max iterations is reached
397  double chi2New=0.; double chi2Old=chi2;
398  double sumConstr=0.;
399  bool onConstr = false;
400  Amg::Vector3D frameOrigin = firstStartingPoint;
401  Amg::Vector3D frameOriginItr = firstStartingPoint;
402  for (int itr=0; itr < m_maxIterations; ++itr)
403  {
404  ATH_MSG_DEBUG("Iteration number: " << itr);
405  if (!restartFit) chi2Old = chi2New;
406  chi2New = 0.;
407 
408  if (restartFit)
409  {
410  // ===> loop over tracks
411  std::vector<V0FitterTrack>::iterator PTIter;
412  int i=0;
413  for (PTIter = v0FitterTracks.begin(); PTIter != v0FitterTracks.end() ; ++PTIter)
414  {
415  V0FitterTrack locP((*PTIter));
416  Wmeas0_mat.block(5*i,5*i,5,5) = locP.Wi_mat;
417  Wmeas_mat.block(5*i,5*i,5,5) = locP.Wi_mat;
418  for (int j=0; j<5; ++j) {
419  Y0_vec(j+5*i) = locP.TrkPar[j];
420  }
421  ++i;
422  }
423  if(pointingConstraint) {
424  Y0_vec(5*nTrk + 0) = x_point;
425  Y0_vec(5*nTrk + 1) = y_point;
426  Y0_vec(5*nTrk + 2) = z_point;
427  Wmeas0_mat.block(5*nTrk,5*nTrk,3,3) = pointingVertexCov;
428  Wmeas_mat.block(5*nTrk,5*nTrk,3,3) = pointingVertexCov;
429  }
430  Wmeas_mat = Wmeas_mat.inverse();
431  }
432 
433  Y_vec = Y0_vec + DeltaY_vec;
434  A_vec = DeltaA_vec;
435 
436  // check theta and phi ranges
437  for (unsigned int i=0; i<nTrk; ++i)
438  {
439  if ( fabs ( Y_vec(2+5*i) ) > 100. || fabs ( Y_vec(3+5*i) ) > 100. ) { return nullptr; }
440  while ( fabs ( Y_vec(2+5*i) ) > M_PI ) Y_vec(2+5*i) += ( Y_vec(2+5*i) > 0 ) ? -2*M_PI : 2*M_PI;
441  while ( Y_vec(3+5*i) > 2*M_PI ) Y_vec(3+5*i) -= 2*M_PI;
442  while ( Y_vec(3+5*i) < -M_PI ) Y_vec(3+5*i) += M_PI;
443  if ( Y_vec(3+5*i) > M_PI )
444  {
445  Y_vec(3+5*i) = 2*M_PI - Y_vec(3+5*i);
446  if ( Y_vec(2+5*i) >= 0 ) Y_vec(2+5*i) += ( Y_vec(2+5*i) >0 ) ? -M_PI : M_PI;
447  }
448  if ( Y_vec(3+5*i) < 0.0 )
449  {
450  Y_vec(3+5*i) = - Y_vec(3+5*i);
451  if ( Y_vec(2+5*i) >= 0 ) Y_vec(2+5*i) += ( Y_vec(2+5*i) >0 ) ? -M_PI : M_PI;
452  }
453  }
454 
455  double SigE=0., SigPx=0., SigPy=0., SigPz=0., Px=0., Py=0., Pz=0.;
456  Amg::VectorX rho(nTrk), Phi(nTrk), charge(nTrk);
457  rho.setZero(); Phi.setZero(); charge.setZero();
458  Amg::VectorX d0Cor(nTrk), d0Fac(nTrk), xcphiplusysphi(nTrk), xsphiminusycphi(nTrk);
459  d0Cor.setZero(); d0Fac.setZero(); xcphiplusysphi.setZero(); xsphiminusycphi.setZero();
460  AmgVector(2) conv_sign;
461  conv_sign[0] = -1; conv_sign[1] = 1;
462  for (unsigned int i=0; i<nTrk; ++i)
463  {
464  charge[i] = (Y_vec(4+5*i) < 0.) ? -1. : 1.;
465  rho[i] = sin(Y_vec(3+5*i))/(B_z*Y_vec(4+5*i));
466  xcphiplusysphi[i] = A_vec(0)*cos(Y_vec(2+5*i))+A_vec(1)*sin(Y_vec(2+5*i));
467  xsphiminusycphi[i] = A_vec(0)*sin(Y_vec(2+5*i))-A_vec(1)*cos(Y_vec(2+5*i));
468  if(fabs(-xcphiplusysphi[i]/rho[i]) > 1.) return nullptr;
469  d0Cor[i] = 0.5*asin(-xcphiplusysphi[i]/rho[i]);
470  double d0Facsq = 1. - xcphiplusysphi[i]*xcphiplusysphi[i]/(rho[i]*rho[i]);
471  d0Fac[i] = (d0Facsq>0.) ? sqrt(d0Facsq) : 0;
472  Phi[i] = Y_vec(2+5*i) + 2.*d0Cor[i];
473 
474  if(massConstraint && !masses.empty() && masses[i] != 0.){
475  SigE += sqrt(1./(Y_vec(4+5*i)*Y_vec(4+5*i)) + masses[i]*masses[i]);
476  SigPx += sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
477  SigPy += sin(Y_vec(3+5*i))*sin(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
478  SigPz += cos(Y_vec(3+5*i))*charge[i]/Y_vec(4+5*i);
479  }
480  Px += sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
481  Py += sin(Y_vec(3+5*i))*sin(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
482  Pz += cos(Y_vec(3+5*i))*charge[i]/Y_vec(4+5*i);
483  }
484 
485  double FMass=0., dFMassdxs=0., dFMassdys=0., dFMassdzs=0.;
486  double FPxy=0., dFPxydxs=0., dFPxydys=0., dFPxydzs=0., dFPxydxp=0., dFPxydyp=0., dFPxydzp=0.;
487  double FPxz=0., dFPxzdxs=0., dFPxzdys=0., dFPxzdzs=0., dFPxzdxp=0., dFPxzdyp=0., dFPxzdzp=0.;
488  Amg::VectorX Fxy(nTrk), Fxz(nTrk), dFMassdPhi(nTrk);
489  Fxy.setZero(); Fxz.setZero(); dFMassdPhi.setZero();
490  Amg::VectorX drhodtheta(nTrk), drhodqOverP(nTrk), csplusbc(nTrk), ccminusbs(nTrk);
491  drhodtheta.setZero(); drhodqOverP.setZero(); csplusbc.setZero(); ccminusbs.setZero();
492  Amg::VectorX dFxydd0(nTrk), dFxydz0(nTrk), dFxydphi(nTrk), dFxydtheta(nTrk), dFxydqOverP(nTrk);
493  dFxydd0.setZero(); dFxydz0.setZero(); dFxydphi.setZero(); dFxydtheta.setZero(); dFxydqOverP.setZero();
494  Amg::VectorX dFxydxs(nTrk), dFxydys(nTrk), dFxydzs(nTrk);
495  dFxydxs.setZero(); dFxydys.setZero(); dFxydzs.setZero();
496  Amg::VectorX dFxzdd0(nTrk), dFxzdz0(nTrk), dFxzdphi(nTrk), dFxzdtheta(nTrk), dFxzdqOverP(nTrk);
497  dFxzdd0.setZero(); dFxzdz0.setZero(); dFxzdphi.setZero(); dFxzdtheta.setZero(); dFxzdqOverP.setZero();
498  Amg::VectorX dFxzdxs(nTrk), dFxzdys(nTrk), dFxzdzs(nTrk);
499  dFxzdxs.setZero(); dFxzdys.setZero(); dFxzdzs.setZero();
500  Amg::VectorX dFMassdd0(nTrk), dFMassdz0(nTrk), dFMassdphi(nTrk), dFMassdtheta(nTrk), dFMassdqOverP(nTrk);
501  dFMassdd0.setZero(); dFMassdz0.setZero(); dFMassdphi.setZero(); dFMassdtheta.setZero(); dFMassdqOverP.setZero();
502  Amg::VectorX dFPxydd0(nTrk), dFPxydz0(nTrk), dFPxydphi(nTrk), dFPxydtheta(nTrk), dFPxydqOverP(nTrk);
503  dFPxydd0.setZero(); dFPxydz0.setZero(); dFPxydphi.setZero(); dFPxydtheta.setZero(); dFPxydqOverP.setZero();
504  Amg::VectorX dFPxzdd0(nTrk), dFPxzdz0(nTrk), dFPxzdphi(nTrk), dFPxzdtheta(nTrk), dFPxzdqOverP(nTrk);
505  dFPxzdd0.setZero(); dFPxzdz0.setZero(); dFPxzdphi.setZero(); dFPxzdtheta.setZero(); dFPxzdqOverP.setZero();
506  Amg::VectorX dPhidd0(nTrk), dPhidz0(nTrk), dPhidphi0(nTrk), dPhidtheta(nTrk), dPhidqOverP(nTrk);
507  dPhidd0.setZero(); dPhidz0.setZero(); dPhidphi0.setZero(); dPhidtheta.setZero(); dPhidqOverP.setZero();
508  Amg::VectorX dPhidxs(nTrk), dPhidys(nTrk), dPhidzs(nTrk);
509  dPhidxs.setZero(); dPhidys.setZero(); dPhidzs.setZero();
510  //
511  // constraint equations for V0vertex fitter
512  //
513  // FMass = mass vertex constraint
514  //
515  if (conversion) {
516  FMass = Phi[1] - Phi[0];
517  } else {
518  FMass = constraintMass*constraintMass - SigE*SigE + SigPx*SigPx + SigPy*SigPy + SigPz*SigPz;
519  }
520  //
521  // FPxy = pointing constraint in xy
522  //
523  FPxy = Px*(frameOriginItr[1] - y_point) - Py*(frameOriginItr[0]- x_point);
524  //
525  // FPxz = pointing constraint in xz
526  //
527  FPxz = Px*(frameOriginItr[2] - z_point) - Pz*(frameOriginItr[0]- x_point);
528 
529  for (unsigned int i=0; i<nTrk; ++i)
530  {
531  //
532  // Fxy = vertex constraint in xy plane (one for each track)
533  //
534  Fxy[i] = Y_vec(0+5*i) + xsphiminusycphi[i] - 2.*rho[i]*sin(d0Cor[i])*sin(d0Cor[i]);
535  //
536  // Fxz = vertex constraint in xz plane (one for each track)
537  //
538  Fxz[i] = Y_vec(1+5*i) - A_vec(2) - rho[i]*2.*d0Cor[i]/tan(Y_vec(3+5*i));
539  //
540  // derivatives
541  //
542  drhodtheta[i] = cos(Y_vec(3+5*i))/(B_z*Y_vec(4+5*i));
543  drhodqOverP[i] = -sin(Y_vec(3+5*i))/(B_z*Y_vec(4+5*i)*Y_vec(4+5*i));
544 
545  dFxydd0[i] = 1.;
546  dFxydphi[i] = xcphiplusysphi[i]*(1. + xsphiminusycphi[i]/(d0Fac[i]*rho[i]));
547  dFxydtheta[i] = (xcphiplusysphi[i]*xcphiplusysphi[i]/(d0Fac[i]*rho[i]*rho[i])-2.*sin(d0Cor[i])*sin(d0Cor[i]))*drhodtheta[i];
548  dFxydqOverP[i] = (xcphiplusysphi[i]*xcphiplusysphi[i]/(d0Fac[i]*rho[i]*rho[i])-2.*sin(d0Cor[i])*sin(d0Cor[i]))*drhodqOverP[i];
549  dFxydxs[i] = sin(Y_vec(2+5*i)) - cos(Y_vec(2+5*i))*xcphiplusysphi[i]/(d0Fac[i]*rho[i]);
550  dFxydys[i] = -cos(Y_vec(2+5*i)) - sin(Y_vec(2+5*i))*xcphiplusysphi[i]/(d0Fac[i]*rho[i]);
551 
552  dFxzdz0[i] = 1.;
553  dFxzdphi[i] = -xsphiminusycphi[i]/(d0Fac[i]*tan(Y_vec(3+5*i)));
554  dFxzdtheta[i] = -((xcphiplusysphi[i]/(d0Fac[i]*rho[i]) + 2.*d0Cor[i])*tan(Y_vec(3+5*i))*drhodtheta[i] -
555  rho[i]*2.*d0Cor[i]/(cos(Y_vec(3+5*i))*cos(Y_vec(3+5*i))))/(tan(Y_vec(3+5*i))*tan(Y_vec(3+5*i)));
556  dFxzdqOverP[i] = -(xcphiplusysphi[i]/(d0Fac[i]*rho[i]) + 2.*d0Cor[i])*drhodqOverP[i]/tan(Y_vec(3+5*i));
557  dFxzdxs[i] = cos(Y_vec(2+5*i))/(d0Fac[i]*tan(Y_vec(3+5*i)));
558  dFxzdys[i] = sin(Y_vec(2+5*i))/(d0Fac[i]*tan(Y_vec(3+5*i)));
559  dFxzdzs[i] = -1.;
560 
561  dPhidphi0[i] = 1. + xsphiminusycphi[i]/(d0Fac[i]*rho[i]);
562  dPhidtheta[i] = xcphiplusysphi[i]*drhodtheta[i]/(d0Fac[i]*rho[i]*rho[i]);
563  dPhidqOverP[i] = xcphiplusysphi[i]*drhodqOverP[i]/(d0Fac[i]*rho[i]*rho[i]);
564  dPhidxs[i] = -cos(Y_vec(2+5*i))/(d0Fac[i]*rho[i]);
565  dPhidys[i] = -sin(Y_vec(2+5*i))/(d0Fac[i]*rho[i]);
566 
567  if (massConstraint && !masses.empty() && masses[i] != 0.){
568  if (conversion) {
569  dFMassdphi[i] = conv_sign[i]*dPhidphi0[i];
570  dFMassdtheta[i] = conv_sign[i]*dPhidtheta[i];
571  dFMassdqOverP[i] = conv_sign[i]*dPhidqOverP[i];
572  dFMassdxs += conv_sign[i]*dPhidxs[i];
573  dFMassdys += conv_sign[i]*dPhidys[i];
574  } else {
575  csplusbc[i] = SigPy*sin(Y_vec(2+5*i))+SigPx*cos(Y_vec(2+5*i));
576  ccminusbs[i] = SigPy*cos(Y_vec(2+5*i))-SigPx*sin(Y_vec(2+5*i));
577  dFMassdphi[i] = 2.*sin(Y_vec(3+5*i))*ccminusbs[i]*charge[i]/Y_vec(4+5*i);
578  dFMassdtheta[i] = 2.*(cos(Y_vec(3+5*i))*csplusbc[i] - sin(Y_vec(3+5*i))*SigPz)*charge[i]/Y_vec(4+5*i);
579  dFMassdqOverP[i] = 2.*SigE/(sqrt(1./(Y_vec(4+5*i)*Y_vec(4+5*i)) + masses[i]*masses[i])*Y_vec(4+5*i)*Y_vec(4+5*i)*Y_vec(4+5*i)) -
580  2.*charge[i]*(sin(Y_vec(3+5*i))*csplusbc[i] + cos(Y_vec(3+5*i))*SigPz)/(Y_vec(4+5*i)*Y_vec(4+5*i));
581  }
582  }
583 
584  if (pointingConstraint){
585  dFPxydphi[i] = -sin(Y_vec(3+5*i))*(sin(Y_vec(2+5*i))*(frameOriginItr[1]-y_point)+cos(Y_vec(2+5*i))*(frameOriginItr[0]-x_point))*charge[i]/Y_vec(4+5*i);
586  dFPxydtheta[i] = cos(Y_vec(3+5*i))*(cos(Y_vec(2+5*i))*(frameOriginItr[1]-y_point)-sin(Y_vec(2+5*i))*(frameOriginItr[0]-x_point))*charge[i]/Y_vec(4+5*i);
587  dFPxydqOverP[i] = -sin(Y_vec(3+5*i))*(cos(Y_vec(2+5*i))*(frameOriginItr[1]-y_point)-sin(Y_vec(2+5*i))*(frameOriginItr[0]-x_point))*charge[i]/(Y_vec(4+5*i)*Y_vec(4+5*i));
588  dFPxydxs += -sin(Y_vec(3+5*i))*sin(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
589  dFPxydys += sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
590  dFPxydxp += sin(Y_vec(3+5*i))*sin(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
591  dFPxydyp += -sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
592 
593  dFPxzdphi[i] = -sin(Y_vec(3+5*i))*sin(Y_vec(2+5*i))*(frameOriginItr[2]-z_point)*charge[i]/Y_vec(4+5*i);
594  dFPxzdtheta[i] = cos(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*(frameOriginItr[2]-z_point)*charge[i]/Y_vec(4+5*i)
595  +sin(Y_vec(3+5*i))*(frameOriginItr[0]-x_point)*charge[i]/Y_vec(4+5*i);
596  dFPxzdqOverP[i] = -sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*(frameOriginItr[2]-z_point)*charge[i]/(Y_vec(4+5*i)*Y_vec(4+5*i))
597  +cos(Y_vec(3+5*i))*(frameOriginItr[0]-x_point)*charge[i]/(Y_vec(4+5*i)*Y_vec(4+5*i));
598  dFPxzdxs += -cos(Y_vec(3+5*i))*charge[i]/Y_vec(4+5*i);
599  dFPxzdzs += sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
600  dFPxzdxp += cos(Y_vec(3+5*i))*charge[i]/Y_vec(4+5*i);
601  dFPxzdzp += -sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
602  }
603 
604  // fill vector of constraints
605  F_vec[i] = -Fxy[i];
606  F_vec[i+nTrk] = -Fxz[i];
607  F_fac_vec[i] = 1.;
608  F_fac_vec[i+nTrk] = 1.;
609  }
610  if(massConstraint) F_vec(2*nTrk+0) = -FMass;
611  //if(massConstraint) F_fac_vec(2*nTrk+0) = 1.;
612  if(massConstraint) F_fac_vec(2*nTrk+0) = 0.000001;
613  if(pointingConstraint) {
614  if(massConstraint) {
615  F_vec(2*nTrk+1) = -FPxy;
616  F_vec(2*nTrk+2) = -FPxz;
617  F_fac_vec(2*nTrk+1) = 0.000001;
618  F_fac_vec(2*nTrk+2) = 0.000001;
619  } else {
620  F_vec(2*nTrk+0) = -FPxy;
621  F_vec(2*nTrk+1) = -FPxz;
622  F_fac_vec(2*nTrk+0) = 0.000001;
623  F_fac_vec(2*nTrk+1) = 0.000001;
624  }
625  }
626 
627  sumConstr = 0.;
628  for (unsigned int i=0; i<dim; ++i)
629  {
630  sumConstr += F_fac_vec[i]*fabs(F_vec[i]);
631  }
632  if ( std::isnan(sumConstr) ) { return nullptr; }
633  if (sumConstr < 0.001) { onConstr = true; }
634  ATH_MSG_DEBUG("sumConstr " << sumConstr);
635 
636  for (unsigned int i=0; i<nTrk; ++i)
637  {
638  Bjac_mat(i,0+5*i) = dFxydd0(i);
639  Bjac_mat(i,1+5*i) = dFxydz0(i);
640  Bjac_mat(i,2+5*i) = dFxydphi(i);
641  Bjac_mat(i,3+5*i) = dFxydtheta(i);
642  Bjac_mat(i,4+5*i) = dFxydqOverP(i);
643  Bjac_mat(i+nTrk,0+5*i) = dFxzdd0(i);
644  Bjac_mat(i+nTrk,1+5*i) = dFxzdz0(i);
645  Bjac_mat(i+nTrk,2+5*i) = dFxzdphi(i);
646  Bjac_mat(i+nTrk,3+5*i) = dFxzdtheta(i);
647  Bjac_mat(i+nTrk,4+5*i) = dFxzdqOverP(i);
648  if(massConstraint) {
649  Bjac_mat(2*nTrk,0+5*i) = dFMassdd0(i);
650  Bjac_mat(2*nTrk,1+5*i) = dFMassdz0(i);
651  Bjac_mat(2*nTrk,2+5*i) = dFMassdphi(i);
652  Bjac_mat(2*nTrk,3+5*i) = dFMassdtheta(i);
653  Bjac_mat(2*nTrk,4+5*i) = dFMassdqOverP(i);
654  }
655  if(pointingConstraint) {
656  if(massConstraint) {
657  Bjac_mat(2*nTrk+1,0+5*i) = dFPxydd0(i);
658  Bjac_mat(2*nTrk+1,1+5*i) = dFPxydz0(i);
659  Bjac_mat(2*nTrk+1,2+5*i) = dFPxydphi(i);
660  Bjac_mat(2*nTrk+1,3+5*i) = dFPxydtheta(i);
661  Bjac_mat(2*nTrk+1,4+5*i) = dFPxydqOverP(i);
662  Bjac_mat(2*nTrk+1,5*nTrk) = dFPxydxp;
663  Bjac_mat(2*nTrk+1,5*nTrk+1) = dFPxydyp;
664  Bjac_mat(2*nTrk+1,5*nTrk+2) = dFPxydzp;
665  Bjac_mat(2*nTrk+2,0+5*i) = dFPxzdd0(i);
666  Bjac_mat(2*nTrk+2,1+5*i) = dFPxzdz0(i);
667  Bjac_mat(2*nTrk+2,2+5*i) = dFPxzdphi(i);
668  Bjac_mat(2*nTrk+2,3+5*i) = dFPxzdtheta(i);
669  Bjac_mat(2*nTrk+2,4+5*i) = dFPxzdqOverP(i);
670  Bjac_mat(2*nTrk+2,5*nTrk) = dFPxzdxp;
671  Bjac_mat(2*nTrk+2,5*nTrk+1) = dFPxzdyp;
672  Bjac_mat(2*nTrk+2,5*nTrk+2) = dFPxzdzp;
673  } else {
674  Bjac_mat(2*nTrk+0,0+5*i) = dFPxydd0(i);
675  Bjac_mat(2*nTrk+0,1+5*i) = dFPxydz0(i);
676  Bjac_mat(2*nTrk+0,2+5*i) = dFPxydphi(i);
677  Bjac_mat(2*nTrk+0,3+5*i) = dFPxydtheta(i);
678  Bjac_mat(2*nTrk+0,4+5*i) = dFPxydqOverP(i);
679  Bjac_mat(2*nTrk+0,5*nTrk) = dFPxydxp;
680  Bjac_mat(2*nTrk+0,5*nTrk+1) = dFPxydyp;
681  Bjac_mat(2*nTrk+0,5*nTrk+2) = dFPxydzp;
682  Bjac_mat(2*nTrk+1,0+5*i) = dFPxzdd0(i);
683  Bjac_mat(2*nTrk+1,1+5*i) = dFPxzdz0(i);
684  Bjac_mat(2*nTrk+1,2+5*i) = dFPxzdphi(i);
685  Bjac_mat(2*nTrk+1,3+5*i) = dFPxzdtheta(i);
686  Bjac_mat(2*nTrk+1,4+5*i) = dFPxzdqOverP(i);
687  Bjac_mat(2*nTrk+1,5*nTrk) = dFPxzdxp;
688  Bjac_mat(2*nTrk+1,5*nTrk+1) = dFPxzdyp;
689  Bjac_mat(2*nTrk+1,5*nTrk+2) = dFPxzdzp;
690  }
691  }
692 
693  Ajac_mat(i,0) = dFxydxs(i);
694  Ajac_mat(i,1) = dFxydys(i);
695  Ajac_mat(i,2) = dFxydzs(i);
696  Ajac_mat(i+nTrk,0) = dFxzdxs(i);
697  Ajac_mat(i+nTrk,1) = dFxzdys(i);
698  Ajac_mat(i+nTrk,2) = dFxzdzs(i);
699  if(massConstraint) {
700  Ajac_mat(2*nTrk,0) = dFMassdxs;
701  Ajac_mat(2*nTrk,1) = dFMassdys;
702  Ajac_mat(2*nTrk,2) = dFMassdzs;
703  }
704  if(pointingConstraint) {
705  if(massConstraint) {
706  Ajac_mat(2*nTrk+1,0) = dFPxydxs;
707  Ajac_mat(2*nTrk+1,1) = dFPxydys;
708  Ajac_mat(2*nTrk+1,2) = dFPxydzs;
709  Ajac_mat(2*nTrk+2,0) = dFPxzdxs;
710  Ajac_mat(2*nTrk+2,1) = dFPxzdys;
711  Ajac_mat(2*nTrk+2,2) = dFPxzdzs;
712  } else {
713  Ajac_mat(2*nTrk+0,0) = dFPxydxs;
714  Ajac_mat(2*nTrk+0,1) = dFPxydys;
715  Ajac_mat(2*nTrk+0,2) = dFPxydzs;
716  Ajac_mat(2*nTrk+1,0) = dFPxzdxs;
717  Ajac_mat(2*nTrk+1,1) = dFPxzdys;
718  Ajac_mat(2*nTrk+1,2) = dFPxzdzs;
719  }
720  }
721  }
722 
723  Wb_mat = Wmeas_mat.similarity(Bjac_mat) ;
724  Wb_mat = Wb_mat.inverse();
725 
726  C22_mat = Wb_mat.similarity(Ajac_mat.transpose());
727  C22_mat = C22_mat.inverse();
728 
729  Btemp_mat = Wb_mat * Bjac_mat * Wmeas_mat;
730  Atemp_mat = Wb_mat * Ajac_mat;
731 
732  C21_mat = - C22_mat * Ajac_mat.transpose() * Btemp_mat;
733  C32_mat = Atemp_mat * C22_mat;
734  C31_mat = Btemp_mat + Atemp_mat * C21_mat;
735  Amg::MatrixX mat_prod_1 = Wmeas_mat * Bjac_mat.transpose();
736  Amg::MatrixX mat_prod_2 = Wmeas_mat * Bjac_mat.transpose() * Wb_mat * Ajac_mat;
737  C11_mat = Wmeas_mat - Wb_mat.similarity( mat_prod_1 ) + C22_mat.similarity( mat_prod_2 );
738 
739  C_cor_vec = Ajac_mat*DeltaA_vec + Bjac_mat*DeltaY_vec;
740  C_vec = C_cor_vec + F_vec;
741 
742  DeltaY_vec = C31_mat.transpose()*C_vec;
743  DeltaA_vec = C32_mat.transpose()*C_vec;
744 
745  for (unsigned int i=0; i<n_dim; ++i)
746  {
747  ChiItr_vec(0,i) = DeltaY_vec(i);
748  }
749  ChiItr_mat = Wmeas0_mat.similarity( ChiItr_vec );
750  chi2New = ChiItr_mat(0,0);
751 
752  // current vertex position in global coordinates
753  frameOriginItr[0] += DeltaA_vec(0);
754  frameOriginItr[1] += DeltaA_vec(1);
755  frameOriginItr[2] += DeltaA_vec(2);
756  if (msgLvl(MSG::DEBUG)) {
757  msg(MSG::DEBUG) << "New vertex, global coordinates: " << frameOriginItr.transpose() << endmsg;
758  msg(MSG::DEBUG) << "chi2Old: " << chi2Old << " chi2New: " << chi2New << " fabs(chi2Old-chi2New): " << fabs(chi2Old-chi2New) << endmsg;
759  }
760 
761  const Amg::Vector3D * globalPositionItr = &frameOriginItr;
762  if (globalPositionItr->perp() > m_maxR && globalPositionItr->z() > m_maxZ) return nullptr;
763 
764  if (onConstr && fabs(chi2Old-chi2New) < 0.1) { break; }
765 
766  double BFieldItr[3];
767  fieldCache.getField(globalPositionItr->data(),BFieldItr);
768  double B_z_new = BFieldItr[2]*299.792; // should be in GeV/mm
769  if (B_z_new == 0. || std::isnan(B_z)) {
770  ATH_MSG_DEBUG("Using old B_z");
771  B_z_new = B_z;
772  }
773 
774  restartFit = false;
775  double deltaR = sqrt(DeltaA_vec(0)*DeltaA_vec(0)+DeltaA_vec(1)*DeltaA_vec(1)+DeltaA_vec(2)*DeltaA_vec(2));
776  double deltaB_z = fabs(B_z-B_z_new)/B_z;
777  bool changeBz = false;
778 
779  if (m_deltaR) {
780  if (deltaR > 5. && itr < m_maxIterations-1) changeBz = true;
781  } else {
782  if (deltaB_z > 0.000001 && itr < m_maxIterations-1) changeBz = true;
783  }
784 
785  if (changeBz) {
786  B_z = B_z_new;
787 
788  v0FitterTracks.clear();
789  Trk::PerigeeSurface perigeeSurfaceItr(*globalPositionItr);
790  // Extrapolate the perigees to the new startpoint of the fit
791  for (const Trk::TrackParameters* chargeParameters : originalPerigees)
792  {
793  if (chargeParameters != nullptr)
794  {
795  // Correct material changes
796  const Amg::Vector3D gMomentum = chargeParameters->momentum();
797  const Amg::Vector3D gDirection = chargeParameters->position() - *globalPositionItr;
798  const double extrapolationDirection = gMomentum .dot( gDirection );
799  MaterialUpdateMode mode = Trk::removeNoise;
800  if(extrapolationDirection > 0) mode = Trk::addNoise;
801  std::unique_ptr<const Trk::Perigee> extrapolatedPerigee(nullptr);
802  std::unique_ptr<const Trk::TrackParameters> tmp =
803  m_extrapolator->extrapolate(ctx,
804  *chargeParameters,
805  perigeeSurfaceItr,
806  Trk::anyDirection,
807  true,
808  Trk::pion,
809  mode);
810  // if of right type we want to pass ownership
811  if (tmp && tmp->associatedSurface().type() == Trk::SurfaceType::Perigee) {
812  extrapolatedPerigee.reset(
813  static_cast<const Trk::Perigee*>(tmp.release()));
814  }
815 
816  if (extrapolatedPerigee == nullptr) {
817  ATH_MSG_DEBUG("Perigee was not extrapolated! Taking original one!");
818  const Trk::Perigee* tmpPerigee = dynamic_cast<const Trk::Perigee*>(chargeParameters);
819  if (tmpPerigee!=nullptr) extrapolatedPerigee = std::make_unique<Trk::Perigee>(*tmpPerigee);
820  else return nullptr;
821  }
822 
823  // store track parameters at new starting point
824  V0FitterTrack locV0FitterTrack;
825  locV0FitterTrack.TrkPar[0] = extrapolatedPerigee->parameters()[Trk::d0];
826  locV0FitterTrack.TrkPar[1] = extrapolatedPerigee->parameters()[Trk::z0];
827  locV0FitterTrack.TrkPar[2] = extrapolatedPerigee->parameters()[Trk::phi];
828  locV0FitterTrack.TrkPar[3] = extrapolatedPerigee->parameters()[Trk::theta];
829  locV0FitterTrack.TrkPar[4] = extrapolatedPerigee->parameters()[Trk::qOverP];
830  locV0FitterTrack.Wi_mat = extrapolatedPerigee->covariance()->inverse().eval();
831  locV0FitterTrack.originalPerigee = chargeParameters;
832  v0FitterTracks.push_back(locV0FitterTrack);
833  } else {
834  ATH_MSG_DEBUG("Track parameters are not charged tracks ... fit aborted");
835  return nullptr;
836  }
837  }
838  frameOrigin = frameOriginItr;
839  Y0_vec *= 0.;
840  Y_vec *= 0.;
841  A_vec *= 0.;
842  DeltaY_vec *= 0.;
843  DeltaA_vec *= 0.;
844  chi2Old = 2000000000000.;
845  chi2New = 0.;
846  sumConstr = 0.;
847  onConstr = false;
848  restartFit = true;
849  }
850 
851  //if (onConstr && fabs(chi2Old-chi2New) < 0.1) { break; }
852 
853  } // end of iteration
854 
855  frameOrigin[0] += DeltaA_vec(0);
856  frameOrigin[1] += DeltaA_vec(1);
857  frameOrigin[2] += DeltaA_vec(2);
858  if ( std::isnan(frameOrigin[0]) || std::isnan(frameOrigin[1]) || std::isnan(frameOrigin[2]) ) return nullptr;
859 
860  Y_vec = Y0_vec + DeltaY_vec;
861 
862  // check theta and phi ranges
863  for (unsigned int i=0; i<nTrk; ++i)
864  {
865  if ( fabs ( Y_vec(2+5*i) ) > 100. || fabs ( Y_vec(3+5*i) ) > 100. ) { return nullptr; }
866  while ( fabs ( Y_vec(2+5*i) ) > M_PI ) Y_vec(2+5*i) += ( Y_vec(2+5*i) > 0 ) ? -2*M_PI : 2*M_PI;
867  while ( Y_vec(3+5*i) > 2*M_PI ) Y_vec(3+5*i) -= 2*M_PI;
868  while ( Y_vec(3+5*i) < -M_PI ) Y_vec(3+5*i) += M_PI;
869  if ( Y_vec(3+5*i) > M_PI )
870  {
871  Y_vec(3+5*i) = 2*M_PI - Y_vec(3+5*i);
872  if ( Y_vec(2+5*i) >= 0 ) Y_vec(2+5*i) += ( Y_vec(2+5*i) >0 ) ? -M_PI : M_PI;
873  }
874  if ( Y_vec(3+5*i) < 0.0 )
875  {
876  Y_vec(3+5*i) = - Y_vec(3+5*i);
877  if ( Y_vec(2+5*i) >= 0 ) Y_vec(2+5*i) += ( Y_vec(2+5*i) >0 ) ? -M_PI : M_PI;
878  }
879  }
880 
881  for (unsigned int i=0; i<n_dim; ++i)
882  {
883  Chi_vec(0,i) = DeltaY_vec(i);
884  }
885  Chi_mat = Wmeas0_mat.similarity( Chi_vec );
886  chi2 = Chi_mat(0,0);
887 
888  V_mat.setZero();
889  V_mat.block(0,0,n_dim,n_dim) = C11_mat;
890  V_mat.block(n_dim,n_dim,3,3) = C22_mat;
891  V_mat.block(n_dim,0,3,n_dim) = C21_mat;
892  V_mat.block(0,n_dim,n_dim,3) = C21_mat.transpose();
893 
894  // ===> loop over tracks
895  std::vector<V0FitterTrack>::iterator BTIter;
896  int iRP=0;
897  for (BTIter = v0FitterTracks.begin(); BTIter != v0FitterTracks.end() ; ++BTIter)
898  {
899  // chi2 per track
900  AmgSymMatrix(5) covTrk; covTrk.setZero();
901  covTrk = Wmeas0_mat.block(5*iRP,5*iRP,4+5*iRP,4+5*iRP);
902  AmgVector(5) chi_vec; chi_vec.setZero();
903  for (unsigned int i=0; i<5; ++i) chi_vec(i) = DeltaY_vec(i+5*iRP);
904  double chi2Trk = chi_vec.dot(covTrk*chi_vec);
905  (*BTIter).chi2=chi2Trk;
906  iRP++;
907  }
908 
909  // Store the vertex
910  xAOD::Vertex* vx = new xAOD::Vertex;
911  vx->makePrivateStore();
912  vx->setPosition (frameOrigin);
913  vx->setCovariancePosition (C22_mat);
914  vx->setFitQuality(chi2,static_cast<float>(ndf));
915  vx->setVertexType(xAOD::VxType::V0Vtx);
916 
917  // Store the tracks at vertex
918  std::vector<VxTrackAtVertex> & tracksAtVertex = vx->vxTrackAtVertex(); tracksAtVertex.clear();
919  Amg::Vector3D Vertex(frameOrigin[0],frameOrigin[1],frameOrigin[2]);
920  const Trk::PerigeeSurface Surface(Vertex);
921  Trk::Perigee * refittedPerigee(nullptr);
922  unsigned int iterf=0;
923  std::vector<V0FitterTrack>::iterator BTIterf;
924  for (BTIterf = v0FitterTracks.begin(); BTIterf != v0FitterTracks.end() ; ++BTIterf)
925  {
926  AmgSymMatrix(5) CovMtxP;
927  CovMtxP.setIdentity();
928  for (unsigned int i=0; i<5; ++i) {
929  for (unsigned int j=0; j<i+1; ++j) {
930  double val = V_mat(5*iterf+i,5*iterf+j);
931  CovMtxP.fillSymmetric(i,j,val);
932  }
933  }
934  refittedPerigee = new Trk::Perigee (Y_vec(0+5*iterf),Y_vec(1+5*iterf),Y_vec(2+5*iterf),Y_vec(3+5*iterf),Y_vec(4+5*iterf),
935  Surface, std::move(CovMtxP));
936  tracksAtVertex.emplace_back((*BTIterf).chi2, refittedPerigee, (*BTIterf).originalPerigee);
937  iterf++;
938  }
939 
940  // Full Covariance Matrix
941  unsigned int sfcmv = nPar*(nPar+1)/2;
942  std::vector<float> floatErrMtx(sfcmv,0.);
943  unsigned int ipnt = 0;
944  for (unsigned int i=0; i<nPar; ++i) {
945  for (unsigned int j=0; j<i+1; ++j) {
946  floatErrMtx[ipnt++]=V_mat(i,j);
947  }
948  }
949  vx->setCovariance(floatErrMtx);
950 
951  return vx;
952  }
953 
954 
955 } //end of namespace definitions
xAOD::iterator
JetConstituentVector::iterator iterator
Definition: JetConstituentVector.cxx:68
covarianceTool.ndf
ndf
Definition: covarianceTool.py:678
Trk::anyDirection
@ anyDirection
Definition: PropDirection.h:22
Trk::Vertex
Definition: Tracking/TrkEvent/VxVertex/VxVertex/Vertex.h:26
xAOD::Vertex_v1::setPosition
void setPosition(const Amg::Vector3D &position)
Sets the 3-position.
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#define ATH_MSG_FATAL(x)
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Eigen::Matrix< double, Eigen::Dynamic, 1 > VectorX
Dynamic Vector - dynamic allocation.
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xAOD::Vertex_v1::setFitQuality
void setFitQuality(float chiSquared, float numberDoF)
Set the 'Fit Quality' information.
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Vertex_v1 Vertex
Define the latest version of the vertex class.
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PerigeeSurface.h
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Trk::TrkV0VertexFitter::m_deltaR
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Dummy class used to allow special convertors to be called for surfaces owned by a detector element.
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xAOD::VxType::V0Vtx
@ V0Vtx
Vertex from V0 decay.
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#define M_PI
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Trk::Perigee
ParametersT< 5, Charged, PerigeeSurface > Perigee
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Trk::z0
@ z0
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IExtrapolator.h
Trk::MaterialUpdateMode
MaterialUpdateMode
This is a steering enum to force the material update it can be: (1) addNoise (-1) removeNoise Second ...
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EL::Detail::ManagerStep::final
@ final
Trk::alongMomentum
@ alongMomentum
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xAOD::Vertex_v1::position
const Amg::Vector3D & position() const
Returns the 3-pos.
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@ Phi
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#define ATH_MSG_VERBOSE(x)
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SG::VarHandleKey::key
const std::string & key() const
Return the StoreGate ID for the referenced object.
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xAOD::Vertex_v1::setCovariance
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Sets the covariance matrix as a simple vector of values.
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ReadCondHandle.h
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void setVertexType(VxType::VertexType vType)
Set the type of the vertex.
GeometryStatics.h
xAOD::Vertex_v1::addTrackAtVertex
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Add a new track to the vertex.
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ToolHandle< Trk::IExtrapolator > m_extrapolator
Data members to store the results.
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@ theta
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xAOD::FirstMeasurement
@ FirstMeasurement
Parameter defined at the position of the 1st measurement.
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#define endmsg
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::StatusCode StatusCode
StatusCode definition for legacy code.
Definition: PhysicsAnalysis/D3PDTools/EventLoop/EventLoop/StatusCode.h:22
ATH_MSG_DEBUG
#define ATH_MSG_DEBUG(x)
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Definition: CylinderSurface.h:55
AmgVector
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@ pion
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Amg::Transform3D
Eigen::Affine3d Transform3D
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CylinderSurface.h
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double chi2(TH1 *h0, TH1 *h1)
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CurvilinearParametersT< 5, Charged, PlaneSurface > CurvilinearParameters
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VxTrackAtVertex.h
Trk::TrkV0VertexFitter::~TrkV0VertexFitter
virtual ~TrkV0VertexFitter()
standard destructor
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Trk::TrkV0VertexFitter::m_maxZ
double m_maxZ
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Ensure that the ATLAS eigen extensions are properly loaded.
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Trk::SurfaceType::Perigee
@ Perigee
Py
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Trk::d0
@ d0
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double charge(const T &p)
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SG::CondHandleKey::initialize
StatusCode initialize(bool used=true)
SG::AuxElement::makePrivateStore
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Create a new (empty) private store for this object.
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Eigen::Matrix< double, 3, 1 > Vector3D
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TrkV0VertexFitter.h
TrackParticle.h
Trk::TrkV0VertexFitter::fit
virtual xAOD::Vertex * fit(const std::vector< const xAOD::TrackParticle * > &vectorTrk, const Amg::Vector3D &startingPoint) const override
Interface for xAOD::TrackParticle with Amg::Vector3D starting point.
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Class describing a Vertex.
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@ addNoise
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#define DEBUG
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Local cache for magnetic field (based on MagFieldServices/AtlasFieldSvcTLS.h)
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@ qOverP
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MagField::AtlasFieldCache::getField
void getField(const double *ATH_RESTRICT xyz, double *ATH_RESTRICT bxyz, double *ATH_RESTRICT deriv=nullptr)
get B field value at given position xyz[3] is in mm, bxyz[3] is in kT if deriv[9] is given,...
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Class describing a TrackParticle.
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std::vector< Trk::VxTrackAtVertex > & vxTrackAtVertex()
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Definition: makeComparison.py:36
xAOD::Vertex_v1::setCovariancePosition
void setCovariancePosition(const AmgSymMatrix(3)&covariancePosition)
Sets the vertex covariance matrix.
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Definition: SUSY_SimplifiedModel_PreInclude.py:7
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