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TrkV0VertexFitter.cxx
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1/*
2 Copyright (C) 2002-2026 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
22within anonymous namespace. They contain temporary calculations of matrices
23and vectors resulting from the vertex calculation. */
24namespace
25{
26 struct V0FitterTrack final
27 {
28 const Trk::TrackParameters * originalPerigee{};
29 double chi2{-1.};
30 AmgVector(5) TrkPar{0,0,0,0,0};
31 AmgSymMatrix(5) Wi_mat{};
32 };
33}
34
35namespace Trk
36{
37 TrkV0VertexFitter::TrkV0VertexFitter(const std::string& t, const std::string& n, const IInterface* p) : base_class(t,n,p),
38 m_maxIterations(10),
39 m_maxDchi2PerNdf(0.1),
40 m_maxR(2000.),
41 m_maxZ(5000.),
42 m_firstMeas(true),
43 m_deltaR(false),
44 m_extrapolator("Trk::Extrapolator/InDetExtrapolator", this)
45 {
46 declareProperty("MaxIterations", m_maxIterations);
47 declareProperty("MaxChi2PerNdf", m_maxDchi2PerNdf);
48 declareProperty("MaxR", m_maxR);
49 declareProperty("MaxZ", m_maxZ);
50 declareProperty("FirstMeasuredPoint", m_firstMeas);
51 declareProperty("Use_deltaR", m_deltaR);
52 declareProperty("Extrapolator", m_extrapolator);
53 declareInterface<IVertexFitter>(this);
54 }
55
56 TrkV0VertexFitter::~TrkV0VertexFitter() = default;
57
58 StatusCode TrkV0VertexFitter::initialize()
59 {
60 if ( m_extrapolator.retrieve().isFailure() ) {
61 ATH_MSG_FATAL("Failed to retrieve tool " << m_extrapolator);
62 return StatusCode::FAILURE;
63 }
64 ATH_MSG_DEBUG( "Retrieved tool " << m_extrapolator );
65
66
67 ATH_CHECK( m_fieldCacheCondObjInputKey.initialize() );
68
69 ATH_MSG_DEBUG( "Initialize successful");
70 return StatusCode::SUCCESS;
71 }
72
73 StatusCode TrkV0VertexFitter::finalize()
74 {
75 ATH_MSG_DEBUG( "Finalize successful" );
76 return StatusCode::SUCCESS;
77 }
78
79
81 std::unique_ptr<xAOD::Vertex> TrkV0VertexFitter::fit(const EventContext& ctx,
82 const std::vector<const xAOD::TrackParticle*>& vectorTrk,
83 const Amg::Vector3D& firstStartingPoint) const
84 {
85 std::vector<double> masses;
86 double constraintMass = -9999.;
87 xAOD::Vertex * pointingVertex = nullptr;
88 return fit(ctx, vectorTrk, masses, constraintMass, pointingVertex, firstStartingPoint);
89 }
90
92 std::unique_ptr<xAOD::Vertex> TrkV0VertexFitter::fit(const EventContext& ctx,
93 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(ctx, vectorTrk, masses, constraintMass, pointingVertex, startingPoint);
101 }
102
104 std::unique_ptr<xAOD::Vertex> TrkV0VertexFitter::fit(const EventContext& ctx,
105 const std::vector<const xAOD::TrackParticle*>& vectorTrk) const
106 {
107 Amg::Vector3D tmpVtx;
108 tmpVtx.setZero();
109 return fit(ctx, vectorTrk, tmpVtx);
110 }
111
113 std::unique_ptr<xAOD::Vertex> TrkV0VertexFitter::fit(const EventContext& ctx,
114 const std::vector<const xAOD::TrackParticle*> & vectorTrk,
115 const std::vector<double>& masses,
116 const double& constraintMass,
117 const xAOD::Vertex* pointingVertex,
118 const Amg::Vector3D& firstStartingPoint) const
119 {
120 std::vector<const Trk::TrackParameters*> measuredPerigees;
121 std::vector<const Trk::TrackParameters*> measuredPerigees_delete;
122 for (const xAOD::TrackParticle* p : vectorTrk)
123 {
124 if (m_firstMeas) {
125 unsigned int indexFMP;
126 if (p->indexOfParameterAtPosition(indexFMP, xAOD::FirstMeasurement)) {
127 measuredPerigees.push_back(new CurvilinearParameters(p->curvilinearParameters(indexFMP)));
128 measuredPerigees_delete.push_back(measuredPerigees.back());
129 ATH_MSG_DEBUG("first measurement on track exists");
130 ATH_MSG_DEBUG("first measurement " << p->curvilinearParameters(indexFMP));
131 ATH_MSG_DEBUG("first measurement covariance " << *(p->curvilinearParameters(indexFMP)).covariance());
132 } else {
133 Amg::Transform3D CylTrf;
134 CylTrf.setIdentity();
135 Trk::CylinderSurface estimationCylinder(CylTrf, p->radiusOfFirstHit(), 10e10);
136 const Trk::TrackParameters* chargeParameters = &p->perigeeParameters();
137 MaterialUpdateMode mode = Trk::removeNoise;
138
139 const Trk::TrackParameters* extrapolatedPerigee =
140 std::abs(chargeParameters->position().z()) > m_maxZ ? nullptr :
141 m_extrapolator->extrapolate(ctx,
142 *chargeParameters,
143 estimationCylinder,
144 Trk::alongMomentum,
145 true,
146 Trk::pion,
147 mode).release();
148
149 if (extrapolatedPerigee != nullptr) {
150 ATH_MSG_DEBUG("extrapolated to first measurement");
151 measuredPerigees.push_back (extrapolatedPerigee);
152 measuredPerigees_delete.push_back (extrapolatedPerigee);
153 } else {
154
155 extrapolatedPerigee =
156 std::abs(chargeParameters->position().z()) > m_maxZ ? nullptr :
157 m_extrapolator->extrapolateDirectly(ctx,
158 *chargeParameters,
159 estimationCylinder,
160 Trk::alongMomentum,
161 true,
162 Trk::pion).release();
163
164 if (extrapolatedPerigee != nullptr) {
165 ATH_MSG_DEBUG( "extrapolated (direct) to first measurement");
166 measuredPerigees.push_back (extrapolatedPerigee);
167 measuredPerigees_delete.push_back (extrapolatedPerigee);
168 } else {
169 ATH_MSG_DEBUG("Failed to extrapolate to the first measurement on track, using Perigee parameters");
170 measuredPerigees.push_back (&p->perigeeParameters());
171 }
172 }
173 }
174 } else {
175 measuredPerigees.push_back (&p->perigeeParameters());
176 }
177 }
178
179 std::unique_ptr<xAOD::Vertex> fittedVxCandidate = fit(ctx, measuredPerigees, masses, constraintMass, pointingVertex, firstStartingPoint);
180
181 // assign the used tracks to the V0Candidate
182 if (fittedVxCandidate) {
183 for (const xAOD::TrackParticle* p : vectorTrk)
184 {
185 ElementLink<xAOD::TrackParticleContainer> el;
186 el.setElement(p);
187 fittedVxCandidate->addTrackAtVertex (el);
188 }
189 }
190
191 for (const auto *ptr : measuredPerigees_delete){ delete ptr; }
192
193 return fittedVxCandidate;
194 }
195
196
197
199 std::unique_ptr<xAOD::Vertex> TrkV0VertexFitter::fit(const EventContext& ctx,
200 const std::vector<const Trk::TrackParameters*> & originalPerigees,
201 const Amg::Vector3D& firstStartingPoint) const
202 {
203 std::vector<double> masses;
204 double constraintMass = -9999.;
205 xAOD::Vertex * pointingVertex = nullptr;
206 return fit(ctx, originalPerigees, masses, constraintMass, pointingVertex, firstStartingPoint);
207 }
208
210 std::unique_ptr<xAOD::Vertex> TrkV0VertexFitter::fit(const EventContext& ctx,
211 const std::vector<const Trk::TrackParameters*> & originalPerigees,
212 const xAOD::Vertex& firstStartingPoint) const
213 {
214 std::vector<double> masses;
215 double constraintMass = -9999.;
216 xAOD::Vertex * pointingVertex = nullptr;
217 const Amg::Vector3D& startingPoint = firstStartingPoint.position();
218 return fit(ctx, originalPerigees, masses, constraintMass, pointingVertex, startingPoint);
219 }
220
222 std::unique_ptr<xAOD::Vertex> TrkV0VertexFitter::fit(const EventContext& ctx,
223 const std::vector<const Trk::TrackParameters*>& originalPerigees) const
224 {
225 Amg::Vector3D tmpVtx;
226 tmpVtx.setZero();
227 return fit(ctx, originalPerigees, tmpVtx);
228 }
229
231 std::unique_ptr<xAOD::Vertex> TrkV0VertexFitter::fit(const EventContext& ctx,
232 const std::vector<const Trk::TrackParameters*>& originalPerigees,
233 const std::vector<double>& masses,
234 const double& constraintMass,
235 const xAOD::Vertex* pointingVertex,
236 const Amg::Vector3D& firstStartingPoint) const
237 {
238 if ( originalPerigees.empty() )
239 {
240 ATH_MSG_DEBUG("No tracks to fit in this event.");
241 return nullptr;
242 }
243
244 // Initialisation of variables
245 bool pointingConstraint = false;
246 bool massConstraint = false;
247 if(constraintMass > -100.) massConstraint = true;
248 bool conversion = false;
249 if(constraintMass == 0. && originalPerigees.size() == 2) conversion = true;
250 double x_point=0., y_point=0., z_point=0.;
251 AmgSymMatrix(3) pointingVertexCov; pointingVertexCov.setIdentity();
252 if (pointingVertex != nullptr) {
253 if (pointingVertex->covariancePosition().trace() != 0.) {
254 pointingConstraint = true;
255 Amg::Vector3D pv = pointingVertex->position();
256 x_point = pv.x();
257 y_point = pv.y();
258 z_point = pv.z();
259 pointingVertexCov = pointingVertex->covariancePosition().inverse();
260 }
261 }
262
263 if (msgLvl(MSG::DEBUG)) {
264 msg(MSG::DEBUG) << "massConstraint " << massConstraint << " pointingConstraint " << pointingConstraint << " conversion " << conversion << endmsg;
265 msg(MSG::DEBUG) << "V0Fitter called with: " << endmsg;
266 if (massConstraint && !masses.empty()) msg(MSG::DEBUG) << "mass constraint, V0Mass = " << constraintMass << " particle masses " << masses << endmsg;
267 if (pointingConstraint) msg(MSG::DEBUG) << "pointing constraint, x = " << x_point << " y = " << y_point << " z = " << z_point << endmsg;
268 }
269
270 bool restartFit = true;
271 double chi2 = 2000000000000.;
272 unsigned int nTrk = originalPerigees.size(); // Number of tracks to fit
273 unsigned int nMeas = 5*nTrk; // Number of measurements
274 unsigned int nVert = 1; // Number of vertices
275
276 unsigned int nCnst = 2*nTrk; // Number of constraint equations
277 unsigned int nPntC = 2; // Contribution from pointing constraint in 2D
278 unsigned int nMass = 1; // Contribution from mass constraint
279
280 if (massConstraint) {
281 nCnst = nCnst + nMass;
282 }
283 if (pointingConstraint) {
284 nCnst = nCnst + nPntC;
285 nMeas = nMeas + 3;
286 nVert = nVert + 1;
287 }
288
289 unsigned int nPar = 5*nTrk + 3*nVert; // Number of parameters
290 int ndf = nMeas - (nPar - nCnst); // Number of degrees of freedom
291 if (ndf < 0) {ndf = 1;}
292
293 unsigned int dim = nCnst; //
294 unsigned int n_dim = nMeas; //
295
296 ATH_MSG_DEBUG("ndf " << ndf << " n_dim " << n_dim << " dim " << dim);
297
298 std::vector<V0FitterTrack> v0FitterTracks;
299
300 Amg::VectorX Y_vec(n_dim); Y_vec.setZero();
301 Amg::VectorX Y0_vec(n_dim); Y0_vec.setZero();
302 Amg::Vector3D A_vec; A_vec.setZero();
303
304 Amg::MatrixX Wmeas_mat(n_dim,n_dim); Wmeas_mat.setZero();
305 Amg::MatrixX Wmeas0_mat(n_dim,n_dim); Wmeas0_mat.setZero();
306 Amg::MatrixX Bjac_mat(dim,n_dim); Bjac_mat.setZero();
307 Amg::MatrixX Ajac_mat(dim,3); Ajac_mat.setZero();
308 Amg::MatrixX C11_mat(n_dim,n_dim); C11_mat.setZero();
309 Amg::MatrixX C22_mat(3,3); C22_mat.setZero();
310 Amg::MatrixX C21_mat(3,n_dim); C21_mat.setZero();
311 Amg::MatrixX C31_mat(dim,n_dim); C31_mat.setZero();
312 Amg::MatrixX C32_mat(dim,3); C32_mat.setZero();
313 Amg::MatrixX Wb_mat(dim,dim); Wb_mat.setZero();
314 Amg::MatrixX Btemp_mat(dim,n_dim); Btemp_mat.setZero();
315 Amg::MatrixX Atemp_mat(dim,3); Atemp_mat.setZero();
316 Amg::VectorX DeltaY_vec(n_dim); DeltaY_vec.setZero();
317 Amg::Vector3D DeltaA_vec; DeltaA_vec.setZero();
318 Amg::VectorX DeltaY0_vec(n_dim); DeltaY0_vec.setZero();
319 Amg::VectorX F_vec(dim); F_vec.setZero();
320 Amg::VectorX C_vec(dim); C_vec.setZero();
321 Amg::VectorX C_cor_vec(dim); C_cor_vec.setZero();
322 Amg::MatrixX V_mat(nPar,nPar); V_mat.setZero();
323 Amg::MatrixX Chi_vec(1,n_dim); Chi_vec.setZero();
324 AmgSymMatrix(1) Chi_mat; Chi_mat.setZero();
325 Amg::MatrixX ChiItr_vec(1,n_dim); ChiItr_vec.setZero();
326 AmgSymMatrix(1) ChiItr_mat; ChiItr_mat.setZero();
327 Amg::VectorX F_fac_vec(dim); F_fac_vec.setZero();
328
329 const Amg::Vector3D * globalPosition = &(firstStartingPoint);
330 ATH_MSG_DEBUG("globalPosition of starting point: " << (*globalPosition)[0] << ", " << (*globalPosition)[1] << ", " << (*globalPosition)[2]);
331
332 if (globalPosition->perp() > m_maxR && globalPosition->z() > m_maxZ) return nullptr;
333
334 SG::ReadCondHandle<AtlasFieldCacheCondObj> readHandle{m_fieldCacheCondObjInputKey, ctx};
335 if (!readHandle.isValid()) {
336 std::string msg = "Failed to retrieve magmnetic field conditions data ";
337 msg += m_fieldCacheCondObjInputKey.key();
338 throw std::runtime_error(msg);
339 }
340 const AtlasFieldCacheCondObj* fieldCondObj{*readHandle};
341 if (!fieldCondObj){
342 ATH_MSG_ERROR("fieldCondObj is nullptr");
343 return nullptr;
344 }
345 MagField::AtlasFieldCache fieldCache;
346 fieldCondObj->getInitializedCache (fieldCache);
347
348 // magnetic field
349 double BField[3];
350 fieldCache.getField(globalPosition->data(),BField);
351 double B_z = BField[2]*299.792; // should be in GeV/mm
352 if (B_z == 0. || std::isnan(B_z)) {
353 ATH_MSG_DEBUG("Could not find a magnetic field different from zero: very very strange");
354 B_z = 0.60407; // Value in GeV/mm (ATLAS units)
355 } else {
356 ATH_MSG_VERBOSE("Magnetic field projection of z axis in the perigee position is: " << B_z << " GeV/mm ");
357 }
358// double B_z = 1.998*0.3;
359
360
361 v0FitterTracks.clear();
362 Trk::PerigeeSurface perigeeSurface(*globalPosition);
363 // Extrapolate the perigees to the startpoint of the fit
364 for (const Trk::TrackParameters* chargeParameters : originalPerigees)
365 {
366 if (chargeParameters != nullptr)
367 {
368 // Correct material changes
369 const Amg::Vector3D gMomentum = chargeParameters->momentum();
370 const Amg::Vector3D gDirection = chargeParameters->position() - *globalPosition;
371 const double extrapolationDirection = gMomentum.dot( gDirection );
372 MaterialUpdateMode mode = Trk::removeNoise;
373 if(extrapolationDirection > 0) mode = Trk::addNoise;
374 std::unique_ptr<const Trk::Perigee> extrapolatedPerigee(nullptr);
375
376 std::unique_ptr<const Trk::TrackParameters> tmp =
377 std::abs(chargeParameters->position().z()) > m_maxZ ? nullptr :
378 m_extrapolator->extrapolate(ctx,
379 *chargeParameters,
380 perigeeSurface,
381 Trk::anyDirection,
382 true,
383 Trk::pion,
384 mode);
385
386 //if of right type we want to pass ownership
387 if (tmp && tmp->associatedSurface().type() == Trk::SurfaceType::Perigee) {
388 extrapolatedPerigee.reset(static_cast<const Trk::Perigee*>(tmp.release()));
389 }
390
391 if (extrapolatedPerigee == nullptr) {
392 ATH_MSG_DEBUG("Perigee was not extrapolated! Taking original one!");
393 const Trk::Perigee* tmpPerigee = dynamic_cast<const Trk::Perigee*>(chargeParameters);
394 if (tmpPerigee!=nullptr) extrapolatedPerigee = std::make_unique<Trk::Perigee>(*tmpPerigee);
395 else return nullptr;
396 }
397
398 // store track parameters at starting point
399 V0FitterTrack locV0FitterTrack{};
400 locV0FitterTrack.TrkPar[0] = extrapolatedPerigee->parameters()[Trk::d0];
401 locV0FitterTrack.TrkPar[1] = extrapolatedPerigee->parameters()[Trk::z0];
402 locV0FitterTrack.TrkPar[2] = extrapolatedPerigee->parameters()[Trk::phi];
403 locV0FitterTrack.TrkPar[3] = extrapolatedPerigee->parameters()[Trk::theta];
404 locV0FitterTrack.TrkPar[4] = extrapolatedPerigee->parameters()[Trk::qOverP];
405 locV0FitterTrack.Wi_mat = extrapolatedPerigee->covariance()->inverse().eval();
406 locV0FitterTrack.originalPerigee = chargeParameters;
407 v0FitterTracks.push_back(locV0FitterTrack);
408 } else {
409 ATH_MSG_DEBUG("Track parameters are not charged tracks ... fit aborted");
410 return nullptr;
411 }
412 }
413
414 // Iterate fits until the fit criteria are met, or the number of max iterations is reached
415 double chi2New=0.; double chi2Old=chi2;
416 double sumConstr=0.;
417 bool onConstr = false;
418 Amg::Vector3D frameOrigin = firstStartingPoint;
419 Amg::Vector3D frameOriginItr = firstStartingPoint;
420 for (int itr=0; itr < m_maxIterations; ++itr)
421 {
422 ATH_MSG_DEBUG("Iteration number: " << itr);
423 if (!restartFit) chi2Old = chi2New;
424 chi2New = 0.;
425
426 if (restartFit)
427 {
428 // ===> loop over tracks
429 std::vector<V0FitterTrack>::iterator PTIter;
430 int i=0;
431 for (PTIter = v0FitterTracks.begin(); PTIter != v0FitterTracks.end() ; ++PTIter)
432 {
433 V0FitterTrack locP((*PTIter));
434 Wmeas0_mat.block<5,5>(5*i,5*i) = locP.Wi_mat;
435 Wmeas_mat.block<5,5>(5*i,5*i) = locP.Wi_mat;
436 for (int j=0; j<5; ++j) {
437 Y0_vec(j+5*i) = locP.TrkPar[j];
438 }
439 ++i;
440 }
441 if(pointingConstraint) {
442 Y0_vec(5*nTrk + 0) = x_point;
443 Y0_vec(5*nTrk + 1) = y_point;
444 Y0_vec(5*nTrk + 2) = z_point;
445 Wmeas0_mat.block<3,3>(5*nTrk,5*nTrk) = pointingVertexCov;
446 Wmeas_mat.block<3,3>(5*nTrk,5*nTrk) = pointingVertexCov;
447 }
448 Wmeas_mat = Wmeas_mat.inverse();
449 }
450
451 Y_vec = Y0_vec + DeltaY_vec;
452 A_vec = DeltaA_vec;
453
454 // check theta and phi ranges
455 for (unsigned int i=0; i<nTrk; ++i)
456 {
457 if ( fabs ( Y_vec(2+5*i) ) > 100. || fabs ( Y_vec(3+5*i) ) > 100. ) { return nullptr; }
458 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;
459 while ( Y_vec(3+5*i) > 2*M_PI ) Y_vec(3+5*i) -= 2*M_PI;
460 while ( Y_vec(3+5*i) < -M_PI ) Y_vec(3+5*i) += M_PI;
461 if ( Y_vec(3+5*i) > M_PI )
462 {
463 Y_vec(3+5*i) = 2*M_PI - Y_vec(3+5*i);
464 if ( Y_vec(2+5*i) >= 0 ) Y_vec(2+5*i) += ( Y_vec(2+5*i) >0 ) ? -M_PI : M_PI;
465 }
466 if ( Y_vec(3+5*i) < 0.0 )
467 {
468 Y_vec(3+5*i) = - Y_vec(3+5*i);
469 if ( Y_vec(2+5*i) >= 0 ) Y_vec(2+5*i) += ( Y_vec(2+5*i) >0 ) ? -M_PI : M_PI;
470 }
471 }
472
473 double SigE=0., SigPx=0., SigPy=0., SigPz=0., Px=0., Py=0., Pz=0.;
474 Amg::VectorX rho(nTrk), Phi(nTrk), charge(nTrk);
475 rho.setZero(); Phi.setZero(); charge.setZero();
476 Amg::VectorX d0Cor(nTrk), d0Fac(nTrk), xcphiplusysphi(nTrk), xsphiminusycphi(nTrk);
477 d0Cor.setZero(); d0Fac.setZero(); xcphiplusysphi.setZero(); xsphiminusycphi.setZero();
478 AmgVector(2) conv_sign;
479 conv_sign[0] = -1; conv_sign[1] = 1;
480 for (unsigned int i=0; i<nTrk; ++i)
481 {
482 charge[i] = (Y_vec(4+5*i) < 0.) ? -1. : 1.;
483 rho[i] = sin(Y_vec(3+5*i))/(B_z*Y_vec(4+5*i));
484 xcphiplusysphi[i] = A_vec(0)*cos(Y_vec(2+5*i))+A_vec(1)*sin(Y_vec(2+5*i));
485 xsphiminusycphi[i] = A_vec(0)*sin(Y_vec(2+5*i))-A_vec(1)*cos(Y_vec(2+5*i));
486 if(fabs(-xcphiplusysphi[i]/rho[i]) > 1.) return nullptr;
487 d0Cor[i] = 0.5*asin(-xcphiplusysphi[i]/rho[i]);
488 double d0Facsq = 1. - xcphiplusysphi[i]*xcphiplusysphi[i]/(rho[i]*rho[i]);
489 d0Fac[i] = (d0Facsq>0.) ? sqrt(d0Facsq) : 0;
490 Phi[i] = Y_vec(2+5*i) + 2.*d0Cor[i];
491
492 if(massConstraint && !masses.empty() && masses[i] != 0.){
493 SigE += sqrt(1./(Y_vec(4+5*i)*Y_vec(4+5*i)) + masses[i]*masses[i]);
494 SigPx += sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
495 SigPy += sin(Y_vec(3+5*i))*sin(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
496 SigPz += cos(Y_vec(3+5*i))*charge[i]/Y_vec(4+5*i);
497 }
498 Px += sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
499 Py += sin(Y_vec(3+5*i))*sin(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
500 Pz += cos(Y_vec(3+5*i))*charge[i]/Y_vec(4+5*i);
501 }
502
503 double FMass=0., dFMassdxs=0., dFMassdys=0., dFMassdzs=0.;
504 double FPxy=0., dFPxydxs=0., dFPxydys=0., dFPxydzs=0., dFPxydxp=0., dFPxydyp=0., dFPxydzp=0.;
505 double FPxz=0., dFPxzdxs=0., dFPxzdys=0., dFPxzdzs=0., dFPxzdxp=0., dFPxzdyp=0., dFPxzdzp=0.;
506 Amg::VectorX Fxy(nTrk), Fxz(nTrk), dFMassdPhi(nTrk);
507 Fxy.setZero(); Fxz.setZero(); dFMassdPhi.setZero();
508 Amg::VectorX drhodtheta(nTrk), drhodqOverP(nTrk), csplusbc(nTrk), ccminusbs(nTrk);
509 drhodtheta.setZero(); drhodqOverP.setZero(); csplusbc.setZero(); ccminusbs.setZero();
510 Amg::VectorX dFxydd0(nTrk), dFxydz0(nTrk), dFxydphi(nTrk), dFxydtheta(nTrk), dFxydqOverP(nTrk);
511 dFxydd0.setZero(); dFxydz0.setZero(); dFxydphi.setZero(); dFxydtheta.setZero(); dFxydqOverP.setZero();
512 Amg::VectorX dFxydxs(nTrk), dFxydys(nTrk), dFxydzs(nTrk);
513 dFxydxs.setZero(); dFxydys.setZero(); dFxydzs.setZero();
514 Amg::VectorX dFxzdd0(nTrk), dFxzdz0(nTrk), dFxzdphi(nTrk), dFxzdtheta(nTrk), dFxzdqOverP(nTrk);
515 dFxzdd0.setZero(); dFxzdz0.setZero(); dFxzdphi.setZero(); dFxzdtheta.setZero(); dFxzdqOverP.setZero();
516 Amg::VectorX dFxzdxs(nTrk), dFxzdys(nTrk), dFxzdzs(nTrk);
517 dFxzdxs.setZero(); dFxzdys.setZero(); dFxzdzs.setZero();
518 Amg::VectorX dFMassdd0(nTrk), dFMassdz0(nTrk), dFMassdphi(nTrk), dFMassdtheta(nTrk), dFMassdqOverP(nTrk);
519 dFMassdd0.setZero(); dFMassdz0.setZero(); dFMassdphi.setZero(); dFMassdtheta.setZero(); dFMassdqOverP.setZero();
520 Amg::VectorX dFPxydd0(nTrk), dFPxydz0(nTrk), dFPxydphi(nTrk), dFPxydtheta(nTrk), dFPxydqOverP(nTrk);
521 dFPxydd0.setZero(); dFPxydz0.setZero(); dFPxydphi.setZero(); dFPxydtheta.setZero(); dFPxydqOverP.setZero();
522 Amg::VectorX dFPxzdd0(nTrk), dFPxzdz0(nTrk), dFPxzdphi(nTrk), dFPxzdtheta(nTrk), dFPxzdqOverP(nTrk);
523 dFPxzdd0.setZero(); dFPxzdz0.setZero(); dFPxzdphi.setZero(); dFPxzdtheta.setZero(); dFPxzdqOverP.setZero();
524 Amg::VectorX dPhidd0(nTrk), dPhidz0(nTrk), dPhidphi0(nTrk), dPhidtheta(nTrk), dPhidqOverP(nTrk);
525 dPhidd0.setZero(); dPhidz0.setZero(); dPhidphi0.setZero(); dPhidtheta.setZero(); dPhidqOverP.setZero();
526 Amg::VectorX dPhidxs(nTrk), dPhidys(nTrk), dPhidzs(nTrk);
527 dPhidxs.setZero(); dPhidys.setZero(); dPhidzs.setZero();
528 //
529 // constraint equations for V0vertex fitter
530 //
531 // FMass = mass vertex constraint
532 //
533 if (conversion) {
534 FMass = Phi[1] - Phi[0];
535 } else {
536 FMass = constraintMass*constraintMass - SigE*SigE + SigPx*SigPx + SigPy*SigPy + SigPz*SigPz;
537 }
538 //
539 // FPxy = pointing constraint in xy
540 //
541 FPxy = Px*(frameOriginItr[1] - y_point) - Py*(frameOriginItr[0]- x_point);
542 //
543 // FPxz = pointing constraint in xz
544 //
545 FPxz = Px*(frameOriginItr[2] - z_point) - Pz*(frameOriginItr[0]- x_point);
546
547 for (unsigned int i=0; i<nTrk; ++i)
548 {
549 //
550 // Fxy = vertex constraint in xy plane (one for each track)
551 //
552 Fxy[i] = Y_vec(0+5*i) + xsphiminusycphi[i] - 2.*rho[i]*sin(d0Cor[i])*sin(d0Cor[i]);
553 //
554 // Fxz = vertex constraint in xz plane (one for each track)
555 //
556 Fxz[i] = Y_vec(1+5*i) - A_vec(2) - rho[i]*2.*d0Cor[i]/tan(Y_vec(3+5*i));
557 //
558 // derivatives
559 //
560 drhodtheta[i] = cos(Y_vec(3+5*i))/(B_z*Y_vec(4+5*i));
561 drhodqOverP[i] = -sin(Y_vec(3+5*i))/(B_z*Y_vec(4+5*i)*Y_vec(4+5*i));
562
563 dFxydd0[i] = 1.;
564 dFxydphi[i] = xcphiplusysphi[i]*(1. + xsphiminusycphi[i]/(d0Fac[i]*rho[i]));
565 dFxydtheta[i] = (xcphiplusysphi[i]*xcphiplusysphi[i]/(d0Fac[i]*rho[i]*rho[i])-2.*sin(d0Cor[i])*sin(d0Cor[i]))*drhodtheta[i];
566 dFxydqOverP[i] = (xcphiplusysphi[i]*xcphiplusysphi[i]/(d0Fac[i]*rho[i]*rho[i])-2.*sin(d0Cor[i])*sin(d0Cor[i]))*drhodqOverP[i];
567 dFxydxs[i] = sin(Y_vec(2+5*i)) - cos(Y_vec(2+5*i))*xcphiplusysphi[i]/(d0Fac[i]*rho[i]);
568 dFxydys[i] = -cos(Y_vec(2+5*i)) - sin(Y_vec(2+5*i))*xcphiplusysphi[i]/(d0Fac[i]*rho[i]);
569
570 dFxzdz0[i] = 1.;
571 dFxzdphi[i] = -xsphiminusycphi[i]/(d0Fac[i]*tan(Y_vec(3+5*i)));
572 dFxzdtheta[i] = -((xcphiplusysphi[i]/(d0Fac[i]*rho[i]) + 2.*d0Cor[i])*tan(Y_vec(3+5*i))*drhodtheta[i] -
573 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)));
574 dFxzdqOverP[i] = -(xcphiplusysphi[i]/(d0Fac[i]*rho[i]) + 2.*d0Cor[i])*drhodqOverP[i]/tan(Y_vec(3+5*i));
575 dFxzdxs[i] = cos(Y_vec(2+5*i))/(d0Fac[i]*tan(Y_vec(3+5*i)));
576 dFxzdys[i] = sin(Y_vec(2+5*i))/(d0Fac[i]*tan(Y_vec(3+5*i)));
577 dFxzdzs[i] = -1.;
578
579 dPhidphi0[i] = 1. + xsphiminusycphi[i]/(d0Fac[i]*rho[i]);
580 dPhidtheta[i] = xcphiplusysphi[i]*drhodtheta[i]/(d0Fac[i]*rho[i]*rho[i]);
581 dPhidqOverP[i] = xcphiplusysphi[i]*drhodqOverP[i]/(d0Fac[i]*rho[i]*rho[i]);
582 dPhidxs[i] = -cos(Y_vec(2+5*i))/(d0Fac[i]*rho[i]);
583 dPhidys[i] = -sin(Y_vec(2+5*i))/(d0Fac[i]*rho[i]);
584
585 if (massConstraint && !masses.empty() && masses[i] != 0.){
586 if (conversion) {
587 dFMassdphi[i] = conv_sign[i]*dPhidphi0[i];
588 dFMassdtheta[i] = conv_sign[i]*dPhidtheta[i];
589 dFMassdqOverP[i] = conv_sign[i]*dPhidqOverP[i];
590 dFMassdxs += conv_sign[i]*dPhidxs[i];
591 dFMassdys += conv_sign[i]*dPhidys[i];
592 } else {
593 csplusbc[i] = SigPy*sin(Y_vec(2+5*i))+SigPx*cos(Y_vec(2+5*i));
594 ccminusbs[i] = SigPy*cos(Y_vec(2+5*i))-SigPx*sin(Y_vec(2+5*i));
595 dFMassdphi[i] = 2.*sin(Y_vec(3+5*i))*ccminusbs[i]*charge[i]/Y_vec(4+5*i);
596 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);
597 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)) -
598 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));
599 }
600 }
601
602 if (pointingConstraint){
603 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);
604 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);
605 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));
606 dFPxydxs += -sin(Y_vec(3+5*i))*sin(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
607 dFPxydys += sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
608 dFPxydxp += sin(Y_vec(3+5*i))*sin(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
609 dFPxydyp += -sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
610
611 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);
612 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)
613 +sin(Y_vec(3+5*i))*(frameOriginItr[0]-x_point)*charge[i]/Y_vec(4+5*i);
614 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))
615 +cos(Y_vec(3+5*i))*(frameOriginItr[0]-x_point)*charge[i]/(Y_vec(4+5*i)*Y_vec(4+5*i));
616 dFPxzdxs += -cos(Y_vec(3+5*i))*charge[i]/Y_vec(4+5*i);
617 dFPxzdzs += sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
618 dFPxzdxp += cos(Y_vec(3+5*i))*charge[i]/Y_vec(4+5*i);
619 dFPxzdzp += -sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
620 }
621
622 // fill vector of constraints
623 F_vec[i] = -Fxy[i];
624 F_vec[i+nTrk] = -Fxz[i];
625 F_fac_vec[i] = 1.;
626 F_fac_vec[i+nTrk] = 1.;
627 }
628 if(massConstraint) F_vec(2*nTrk+0) = -FMass;
629 //if(massConstraint) F_fac_vec(2*nTrk+0) = 1.;
630 if(massConstraint) F_fac_vec(2*nTrk+0) = 0.000001;
631 if(pointingConstraint) {
632 if(massConstraint) {
633 F_vec(2*nTrk+1) = -FPxy;
634 F_vec(2*nTrk+2) = -FPxz;
635 F_fac_vec(2*nTrk+1) = 0.000001;
636 F_fac_vec(2*nTrk+2) = 0.000001;
637 } else {
638 F_vec(2*nTrk+0) = -FPxy;
639 F_vec(2*nTrk+1) = -FPxz;
640 F_fac_vec(2*nTrk+0) = 0.000001;
641 F_fac_vec(2*nTrk+1) = 0.000001;
642 }
643 }
644
645 sumConstr = 0.;
646 for (unsigned int i=0; i<dim; ++i)
647 {
648 sumConstr += F_fac_vec[i]*fabs(F_vec[i]);
649 }
650 if ( std::isnan(sumConstr) ) { return nullptr; }
651 if (sumConstr < 0.001) { onConstr = true; }
652 ATH_MSG_DEBUG("sumConstr " << sumConstr);
653
654 for (unsigned int i=0; i<nTrk; ++i)
655 {
656 Bjac_mat(i,0+5*i) = dFxydd0(i);
657 Bjac_mat(i,1+5*i) = dFxydz0(i);
658 Bjac_mat(i,2+5*i) = dFxydphi(i);
659 Bjac_mat(i,3+5*i) = dFxydtheta(i);
660 Bjac_mat(i,4+5*i) = dFxydqOverP(i);
661 Bjac_mat(i+nTrk,0+5*i) = dFxzdd0(i);
662 Bjac_mat(i+nTrk,1+5*i) = dFxzdz0(i);
663 Bjac_mat(i+nTrk,2+5*i) = dFxzdphi(i);
664 Bjac_mat(i+nTrk,3+5*i) = dFxzdtheta(i);
665 Bjac_mat(i+nTrk,4+5*i) = dFxzdqOverP(i);
666 if(massConstraint) {
667 Bjac_mat(2*nTrk,0+5*i) = dFMassdd0(i);
668 Bjac_mat(2*nTrk,1+5*i) = dFMassdz0(i);
669 Bjac_mat(2*nTrk,2+5*i) = dFMassdphi(i);
670 Bjac_mat(2*nTrk,3+5*i) = dFMassdtheta(i);
671 Bjac_mat(2*nTrk,4+5*i) = dFMassdqOverP(i);
672 }
673 if(pointingConstraint) {
674 if(massConstraint) {
675 Bjac_mat(2*nTrk+1,0+5*i) = dFPxydd0(i);
676 Bjac_mat(2*nTrk+1,1+5*i) = dFPxydz0(i);
677 Bjac_mat(2*nTrk+1,2+5*i) = dFPxydphi(i);
678 Bjac_mat(2*nTrk+1,3+5*i) = dFPxydtheta(i);
679 Bjac_mat(2*nTrk+1,4+5*i) = dFPxydqOverP(i);
680 Bjac_mat(2*nTrk+1,5*nTrk) = dFPxydxp;
681 Bjac_mat(2*nTrk+1,5*nTrk+1) = dFPxydyp;
682 Bjac_mat(2*nTrk+1,5*nTrk+2) = dFPxydzp;
683 Bjac_mat(2*nTrk+2,0+5*i) = dFPxzdd0(i);
684 Bjac_mat(2*nTrk+2,1+5*i) = dFPxzdz0(i);
685 Bjac_mat(2*nTrk+2,2+5*i) = dFPxzdphi(i);
686 Bjac_mat(2*nTrk+2,3+5*i) = dFPxzdtheta(i);
687 Bjac_mat(2*nTrk+2,4+5*i) = dFPxzdqOverP(i);
688 Bjac_mat(2*nTrk+2,5*nTrk) = dFPxzdxp;
689 Bjac_mat(2*nTrk+2,5*nTrk+1) = dFPxzdyp;
690 Bjac_mat(2*nTrk+2,5*nTrk+2) = dFPxzdzp;
691 } else {
692 Bjac_mat(2*nTrk+0,0+5*i) = dFPxydd0(i);
693 Bjac_mat(2*nTrk+0,1+5*i) = dFPxydz0(i);
694 Bjac_mat(2*nTrk+0,2+5*i) = dFPxydphi(i);
695 Bjac_mat(2*nTrk+0,3+5*i) = dFPxydtheta(i);
696 Bjac_mat(2*nTrk+0,4+5*i) = dFPxydqOverP(i);
697 Bjac_mat(2*nTrk+0,5*nTrk) = dFPxydxp;
698 Bjac_mat(2*nTrk+0,5*nTrk+1) = dFPxydyp;
699 Bjac_mat(2*nTrk+0,5*nTrk+2) = dFPxydzp;
700 Bjac_mat(2*nTrk+1,0+5*i) = dFPxzdd0(i);
701 Bjac_mat(2*nTrk+1,1+5*i) = dFPxzdz0(i);
702 Bjac_mat(2*nTrk+1,2+5*i) = dFPxzdphi(i);
703 Bjac_mat(2*nTrk+1,3+5*i) = dFPxzdtheta(i);
704 Bjac_mat(2*nTrk+1,4+5*i) = dFPxzdqOverP(i);
705 Bjac_mat(2*nTrk+1,5*nTrk) = dFPxzdxp;
706 Bjac_mat(2*nTrk+1,5*nTrk+1) = dFPxzdyp;
707 Bjac_mat(2*nTrk+1,5*nTrk+2) = dFPxzdzp;
708 }
709 }
710
711 Ajac_mat(i,0) = dFxydxs(i);
712 Ajac_mat(i,1) = dFxydys(i);
713 Ajac_mat(i,2) = dFxydzs(i);
714 Ajac_mat(i+nTrk,0) = dFxzdxs(i);
715 Ajac_mat(i+nTrk,1) = dFxzdys(i);
716 Ajac_mat(i+nTrk,2) = dFxzdzs(i);
717 if(massConstraint) {
718 Ajac_mat(2*nTrk,0) = dFMassdxs;
719 Ajac_mat(2*nTrk,1) = dFMassdys;
720 Ajac_mat(2*nTrk,2) = dFMassdzs;
721 }
722 if(pointingConstraint) {
723 if(massConstraint) {
724 Ajac_mat(2*nTrk+1,0) = dFPxydxs;
725 Ajac_mat(2*nTrk+1,1) = dFPxydys;
726 Ajac_mat(2*nTrk+1,2) = dFPxydzs;
727 Ajac_mat(2*nTrk+2,0) = dFPxzdxs;
728 Ajac_mat(2*nTrk+2,1) = dFPxzdys;
729 Ajac_mat(2*nTrk+2,2) = dFPxzdzs;
730 } else {
731 Ajac_mat(2*nTrk+0,0) = dFPxydxs;
732 Ajac_mat(2*nTrk+0,1) = dFPxydys;
733 Ajac_mat(2*nTrk+0,2) = dFPxydzs;
734 Ajac_mat(2*nTrk+1,0) = dFPxzdxs;
735 Ajac_mat(2*nTrk+1,1) = dFPxzdys;
736 Ajac_mat(2*nTrk+1,2) = dFPxzdzs;
737 }
738 }
739 }
740
741 Wb_mat = Wmeas_mat.similarity(Bjac_mat) ;
742 Wb_mat = Wb_mat.inverse();
743
744 C22_mat = Wb_mat.similarity(Ajac_mat.transpose());
745 C22_mat = C22_mat.inverse();
746
747 Btemp_mat = Wb_mat * Bjac_mat * Wmeas_mat;
748 Atemp_mat = Wb_mat * Ajac_mat;
749
750 C21_mat = - C22_mat * Ajac_mat.transpose() * Btemp_mat;
751 C32_mat = Atemp_mat * C22_mat;
752 C31_mat = Btemp_mat + Atemp_mat * C21_mat;
753 Amg::MatrixX mat_prod_1 = Wmeas_mat * Bjac_mat.transpose();
754 Amg::MatrixX mat_prod_2 = Wmeas_mat * Bjac_mat.transpose() * Wb_mat * Ajac_mat;
755 C11_mat = Wmeas_mat - Wb_mat.similarity( mat_prod_1 ) + C22_mat.similarity( mat_prod_2 );
756
757 C_cor_vec = Ajac_mat*DeltaA_vec + Bjac_mat*DeltaY_vec;
758 C_vec = C_cor_vec + F_vec;
759
760 DeltaY_vec = C31_mat.transpose()*C_vec;
761 DeltaA_vec = C32_mat.transpose()*C_vec;
762
763 for (unsigned int i=0; i<n_dim; ++i)
764 {
765 ChiItr_vec(0,i) = DeltaY_vec(i);
766 }
767 ChiItr_mat = Wmeas0_mat.similarity( ChiItr_vec );
768 chi2New = ChiItr_mat(0,0);
769
770 // current vertex position in global coordinates
771 frameOriginItr[0] += DeltaA_vec(0);
772 frameOriginItr[1] += DeltaA_vec(1);
773 frameOriginItr[2] += DeltaA_vec(2);
774 if (msgLvl(MSG::DEBUG)) {
775 msg(MSG::DEBUG) << "New vertex, global coordinates: " << frameOriginItr.transpose() << endmsg;
776 msg(MSG::DEBUG) << "chi2Old: " << chi2Old << " chi2New: " << chi2New << " fabs(chi2Old-chi2New): " << fabs(chi2Old-chi2New) << endmsg;
777 }
778
779 const Amg::Vector3D * globalPositionItr = &frameOriginItr;
780 if (globalPositionItr->perp() > m_maxR && globalPositionItr->z() > m_maxZ) return nullptr;
781
782 if (onConstr && fabs(chi2Old-chi2New) < 0.1) { break; }
783
784 double BFieldItr[3];
785 fieldCache.getField(globalPositionItr->data(),BFieldItr);
786 double B_z_new = BFieldItr[2]*299.792; // should be in GeV/mm
787 if (B_z_new == 0. || std::isnan(B_z_new)) {
788 ATH_MSG_DEBUG("Using old B_z");
789 B_z_new = B_z;
790 }
791
792 restartFit = false;
793 double deltaR = sqrt(DeltaA_vec(0)*DeltaA_vec(0)+DeltaA_vec(1)*DeltaA_vec(1)+DeltaA_vec(2)*DeltaA_vec(2));
794 double deltaB_z = fabs(B_z-B_z_new)/B_z;
795 bool changeBz = false;
796
797 if (m_deltaR) {
798 if (deltaR > 5. && itr < m_maxIterations-1) changeBz = true;
799 } else {
800 if (deltaB_z > 0.000001 && itr < m_maxIterations-1) changeBz = true;
801 }
802
803 if (changeBz) {
804 B_z = B_z_new;
805
806 v0FitterTracks.clear();
807 Trk::PerigeeSurface perigeeSurfaceItr(*globalPositionItr);
808 // Extrapolate the perigees to the new startpoint of the fit
809 for (const Trk::TrackParameters* chargeParameters : originalPerigees)
810 {
811 if (chargeParameters != nullptr)
812 {
813 // Correct material changes
814 const Amg::Vector3D gMomentum = chargeParameters->momentum();
815 const Amg::Vector3D gDirection = chargeParameters->position() - *globalPositionItr;
816 const double extrapolationDirection = gMomentum .dot( gDirection );
817 MaterialUpdateMode mode = Trk::removeNoise;
818 if(extrapolationDirection > 0) mode = Trk::addNoise;
819 std::unique_ptr<const Trk::Perigee> extrapolatedPerigee(nullptr);
820
821 std::unique_ptr<const Trk::TrackParameters> tmp =
822 std::abs(chargeParameters->position().z()) > m_maxZ ? nullptr :
823 m_extrapolator->extrapolate(ctx,
824 *chargeParameters,
825 perigeeSurfaceItr,
826 Trk::anyDirection,
827 true,
828 Trk::pion,
829 mode);
830
831 // if of right type we want to pass ownership
832 if (tmp && tmp->associatedSurface().type() == Trk::SurfaceType::Perigee) {
833 extrapolatedPerigee.reset(
834 static_cast<const Trk::Perigee*>(tmp.release()));
835 }
836
837 if (extrapolatedPerigee == nullptr) {
838 ATH_MSG_DEBUG("Perigee was not extrapolated! Taking original one!");
839 const Trk::Perigee* tmpPerigee = dynamic_cast<const Trk::Perigee*>(chargeParameters);
840 if (tmpPerigee!=nullptr) extrapolatedPerigee = std::make_unique<Trk::Perigee>(*tmpPerigee);
841 else return nullptr;
842 }
843
844 // store track parameters at new starting point
845 V0FitterTrack locV0FitterTrack;
846 locV0FitterTrack.TrkPar[0] = extrapolatedPerigee->parameters()[Trk::d0];
847 locV0FitterTrack.TrkPar[1] = extrapolatedPerigee->parameters()[Trk::z0];
848 locV0FitterTrack.TrkPar[2] = extrapolatedPerigee->parameters()[Trk::phi];
849 locV0FitterTrack.TrkPar[3] = extrapolatedPerigee->parameters()[Trk::theta];
850 locV0FitterTrack.TrkPar[4] = extrapolatedPerigee->parameters()[Trk::qOverP];
851 locV0FitterTrack.Wi_mat = extrapolatedPerigee->covariance()->inverse().eval();
852 locV0FitterTrack.originalPerigee = chargeParameters;
853 v0FitterTracks.push_back(locV0FitterTrack);
854 } else {
855 ATH_MSG_DEBUG("Track parameters are not charged tracks ... fit aborted");
856 return nullptr;
857 }
858 }
859 frameOrigin = frameOriginItr;
860 Y0_vec *= 0.;
861 Y_vec *= 0.;
862 A_vec *= 0.;
863 DeltaY_vec *= 0.;
864 DeltaA_vec *= 0.;
865 chi2Old = 2000000000000.;
866 chi2New = 0.;
867 sumConstr = 0.;
868 onConstr = false;
869 restartFit = true;
870 }
871
872 //if (onConstr && fabs(chi2Old-chi2New) < 0.1) { break; }
873
874 } // end of iteration
875
876 frameOrigin[0] += DeltaA_vec(0);
877 frameOrigin[1] += DeltaA_vec(1);
878 frameOrigin[2] += DeltaA_vec(2);
879 if ( std::isnan(frameOrigin[0]) || std::isnan(frameOrigin[1]) || std::isnan(frameOrigin[2]) ) return nullptr;
880
881 Y_vec = Y0_vec + DeltaY_vec;
882
883 // check theta and phi ranges
884 for (unsigned int i=0; i<nTrk; ++i)
885 {
886 if ( fabs ( Y_vec(2+5*i) ) > 100. || fabs ( Y_vec(3+5*i) ) > 100. ) { return nullptr; }
887 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;
888 while ( Y_vec(3+5*i) > 2*M_PI ) Y_vec(3+5*i) -= 2*M_PI;
889 while ( Y_vec(3+5*i) < -M_PI ) Y_vec(3+5*i) += M_PI;
890 if ( Y_vec(3+5*i) > M_PI )
891 {
892 Y_vec(3+5*i) = 2*M_PI - Y_vec(3+5*i);
893 if ( Y_vec(2+5*i) >= 0 ) Y_vec(2+5*i) += ( Y_vec(2+5*i) >0 ) ? -M_PI : M_PI;
894 }
895 if ( Y_vec(3+5*i) < 0.0 )
896 {
897 Y_vec(3+5*i) = - Y_vec(3+5*i);
898 if ( Y_vec(2+5*i) >= 0 ) Y_vec(2+5*i) += ( Y_vec(2+5*i) >0 ) ? -M_PI : M_PI;
899 }
900 }
901
902 for (unsigned int i=0; i<n_dim; ++i)
903 {
904 Chi_vec(0,i) = DeltaY_vec(i);
905 }
906 Chi_mat = Wmeas0_mat.similarity( Chi_vec );
907 chi2 = Chi_mat(0,0);
908
909 V_mat.setZero();
910 V_mat.block(0,0,n_dim,n_dim) = C11_mat;
911 V_mat.block<3,3>(n_dim,n_dim) = C22_mat;
912 V_mat.block(n_dim,0,3,n_dim) = C21_mat;
913 V_mat.block(0,n_dim,n_dim,3) = C21_mat.transpose();
914
915 // ===> loop over tracks
916 std::vector<V0FitterTrack>::iterator BTIter;
917 int iRP=0;
918 for (BTIter = v0FitterTracks.begin(); BTIter != v0FitterTracks.end() ; ++BTIter)
919 {
920 // chi2 per track
921 AmgSymMatrix(5) covTrk = Wmeas0_mat.block<5,5>(5*iRP,5*iRP);
922 AmgVector(5) chi_vec; chi_vec.setZero();
923 for (unsigned int i=0; i<5; ++i) chi_vec(i) = DeltaY_vec(i+5*iRP);
924 double chi2Trk = chi_vec.dot(covTrk*chi_vec);
925 (*BTIter).chi2=chi2Trk;
926 iRP++;
927 }
928
929 // Store the vertex
930 auto vx = std::make_unique<xAOD::Vertex>();
931 vx->makePrivateStore();
932 vx->setPosition (frameOrigin);
933 vx->setCovariancePosition (C22_mat);
934 vx->setFitQuality(chi2,static_cast<float>(ndf));
935 vx->setVertexType(xAOD::VxType::V0Vtx);
936
937 // Store the tracks at vertex
938 std::vector<VxTrackAtVertex> & tracksAtVertex = vx->vxTrackAtVertex(); tracksAtVertex.clear();
939 Amg::Vector3D Vertex(frameOrigin[0],frameOrigin[1],frameOrigin[2]);
940 const Trk::PerigeeSurface Surface(Vertex);
941 Trk::Perigee * refittedPerigee(nullptr);
942 unsigned int iterf=0;
943 std::vector<V0FitterTrack>::iterator BTIterf;
944 for (BTIterf = v0FitterTracks.begin(); BTIterf != v0FitterTracks.end() ; ++BTIterf)
945 {
946 AmgSymMatrix(5) CovMtxP = V_mat.block<5,5>(5*iterf, 5*iterf);
947 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),
948 Surface, std::move(CovMtxP));
949 tracksAtVertex.emplace_back((*BTIterf).chi2, refittedPerigee, (*BTIterf).originalPerigee);
950 iterf++;
951 }
952
953 // Full Covariance Matrix
954 unsigned int sfcmv = nPar*(nPar+1)/2;
955 std::vector<float> floatErrMtx(sfcmv,0.);
956 unsigned int ipnt = 0;
957 for (unsigned int i=0; i<nPar; ++i) {
958 for (unsigned int j=0; j<i+1; ++j) {
959 floatErrMtx[ipnt++]=V_mat(i,j);
960 }
961 }
962 vx->setCovariance(floatErrMtx);
963
964 return vx;
965 }
966
967
968} //end of namespace definitions
M_PI
#define M_PI
Definition ActiveFraction.h:14
deltaR
Scalar deltaR(const MatrixBase< Derived > &vec) const
Definition AmgMatrixBasePlugin.h:105
endmsg
#define endmsg
Definition AnalysisConfig_Ntuple.cxx:54
ATH_CHECK
#define ATH_CHECK
Evaluate an expression and check for errors.
Definition AthCheckMacros.h:40
ATH_MSG_DEBUG
#define ATH_MSG_DEBUG(x,...)
Definition AthMsgStreamMacros.h:43
ATH_MSG_ERROR
#define ATH_MSG_ERROR(x,...)
Definition AthMsgStreamMacros.h:47
ATH_MSG_VERBOSE
#define ATH_MSG_VERBOSE(x,...)
Definition AthMsgStreamMacros.h:42
ATH_MSG_FATAL
#define ATH_MSG_FATAL(x,...)
Definition AthMsgStreamMacros.h:48
charge
double charge(const T &p)
Definition AtlasPID.h:1003
AmgSymMatrix
#define AmgSymMatrix(dim)
Definition EventPrimitives.h:50
AmgVector
#define AmgVector(rows)
Definition EventPrimitives.h:55
Vertex
boost::graph_traits< boost::adjacency_list< boost::vecS, boost::vecS, boost::bidirectionalS > >::vertex_descriptor Vertex
Definition FPGATrackSimGNNRoadMakerTool.h:35
Phi
@ Phi
Definition RPCdef.h:8
AtlasFieldCacheCondObj::getInitializedCache
void getInitializedCache(MagField::AtlasFieldCache &cache) const
get B field cache for evaluation as a function of 2-d or 3-d position.
Definition AtlasFieldCacheCondObj.h:32
MagField::AtlasFieldCache
Local cache for magnetic field (based on MagFieldServices/AtlasFieldSvcTLS.h).
Definition AtlasFieldCache.h:43
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,...
Definition AtlasFieldCache.cxx:42
Trk::CylinderSurface
Class for a CylinderSurface in the ATLAS detector.
Definition CylinderSurface.h:55
Trk::ParametersBase::position
const Amg::Vector3D & position() const
Access method for the position.
Trk::PerigeeSurface
Class describing the Line to which the Perigee refers to.
Definition PerigeeSurface.h:43
Trk::Surface
Abstract Base Class for tracking surfaces.
Definition Surface.h:79
Trk::TrkV0VertexFitter::initialize
virtual StatusCode initialize() override
Definition TrkV0VertexFitter.cxx:58
Trk::TrkV0VertexFitter::TrkV0VertexFitter
TrkV0VertexFitter(const std::string &t, const std::string &n, const IInterface *p)
Definition TrkV0VertexFitter.cxx:37
Trk::TrkV0VertexFitter::m_fieldCacheCondObjInputKey
SG::ReadCondHandleKey< AtlasFieldCacheCondObj > m_fieldCacheCondObjInputKey
Definition TrkV0VertexFitter.h:194
Trk::TrkV0VertexFitter::m_extrapolator
ToolHandle< Trk::IExtrapolator > m_extrapolator
Data members to store the results.
Definition TrkV0VertexFitter.h:192
Trk::TrkV0VertexFitter::finalize
virtual StatusCode finalize() override
Definition TrkV0VertexFitter.cxx:73
Trk::TrkV0VertexFitter::~TrkV0VertexFitter
virtual ~TrkV0VertexFitter()
standard destructor
Trk::TrkV0VertexFitter::fit
virtual std::unique_ptr< xAOD::Vertex > fit(const EventContext &ctx, const std::vector< const xAOD::TrackParticle * > &vectorTrk, const Amg::Vector3D &startingPoint) const override
Interface for xAOD::TrackParticle with Amg::Vector3D starting point.
Definition TrkV0VertexFitter.cxx:81
Trk::Vertex
This class is a simplest representation of a vertex candidate.
Definition Tracking/TrkEvent/VxVertex/VxVertex/Vertex.h:26
xAOD::Vertex_v1::position
const Amg::Vector3D & position() const
Returns the 3-pos.
Definition Vertex_v1.cxx:106
chi2
double chi2(TH1 *h0, TH1 *h1)
Definition comparitor.cxx:525
Amg::MatrixX
Eigen::Matrix< double, Eigen::Dynamic, Eigen::Dynamic > MatrixX
Dynamic Matrix - dynamic allocation.
Definition EventPrimitives.h:27
Amg::Transform3D
Eigen::Affine3d Transform3D
Definition GeoPrimitives.h:46
Amg::Vector3D
Eigen::Matrix< double, 3, 1 > Vector3D
Definition GeoPrimitives.h:48
Amg::VectorX
Eigen::Matrix< double, Eigen::Dynamic, 1 > VectorX
Dynamic Vector - dynamic allocation.
Definition EventPrimitives.h:30
Trk
Ensure that the ATLAS eigen extensions are properly loaded.
Definition FakeTrackBuilder.h:9
Trk::alongMomentum
@ alongMomentum
Definition PropDirection.h:20
Trk::anyDirection
@ anyDirection
Definition PropDirection.h:22
Trk::Perigee
ParametersT< TrackParametersDim, Charged, PerigeeSurface > Perigee
Definition Tracking/TrkEvent/TrkParameters/TrkParameters/TrackParameters.h:33
Trk::CurvilinearParameters
CurvilinearParametersT< TrackParametersDim, Charged, PlaneSurface > CurvilinearParameters
Definition Tracking/TrkEvent/TrkParameters/TrkParameters/TrackParameters.h:29
Trk::theta
@ theta
Definition ParamDefs.h:66
Trk::qOverP
@ qOverP
perigee
Definition ParamDefs.h:67
Trk::phi
@ phi
Definition ParamDefs.h:75
Trk::d0
@ d0
Definition ParamDefs.h:63
Trk::z0
@ z0
Definition ParamDefs.h:64
Trk::MaterialUpdateMode
MaterialUpdateMode
This is a steering enum to force the material update it can be: (1) addNoise (-1) removeNoise Second ...
Definition MaterialUpdateMode.h:18
Trk::TrackParameters
ParametersBase< TrackParametersDim, Charged > TrackParameters
Definition Tracking/TrkEvent/TrkParameters/TrkParameters/TrackParameters.h:27
xAOD::VxType::V0Vtx
@ V0Vtx
Vertex from V0 decay.
Definition TrackingPrimitives.h:594
xAOD::TrackParticle
TrackParticle_v1 TrackParticle
Reference the current persistent version:
Definition Event/xAOD/xAODTracking/xAODTracking/TrackParticle.h:13
xAOD::Vertex
Vertex_v1 Vertex
Define the latest version of the vertex class.
Definition Event/xAOD/xAODTracking/xAODTracking/Vertex.h:16
xAOD::FirstMeasurement
@ FirstMeasurement
Parameter defined at the position of the 1st measurement.
Definition TrackingPrimitives.h:214
msg
MsgStream & msg
Definition testRead.cxx:32
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