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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 V0FitterTrack() : originalPerigee(nullptr), chi2(-1.) {}
29 const Trk::TrackParameters * originalPerigee;
30 double chi2;
31 AmgVector(5) TrkPar;
32 AmgSymMatrix(5) Wi_mat;
33 };
34}
35
36namespace Trk
37{
38 TrkV0VertexFitter::TrkV0VertexFitter(const std::string& t, const std::string& n, const IInterface* p) : base_class(t,n,p),
39 m_maxIterations(10),
40 m_maxDchi2PerNdf(0.1),
41 m_maxR(2000.),
42 m_maxZ(5000.),
43 m_firstMeas(true),
44 m_deltaR(false),
45 m_extrapolator("Trk::Extrapolator/InDetExtrapolator", this)
46 {
47 declareProperty("MaxIterations", m_maxIterations);
48 declareProperty("MaxChi2PerNdf", m_maxDchi2PerNdf);
49 declareProperty("MaxR", m_maxR);
50 declareProperty("MaxZ", m_maxZ);
51 declareProperty("FirstMeasuredPoint", m_firstMeas);
52 declareProperty("Use_deltaR", m_deltaR);
53 declareProperty("Extrapolator", m_extrapolator);
54 declareInterface<IVertexFitter>(this);
55 }
56
57 TrkV0VertexFitter::~TrkV0VertexFitter() = default;
58
59 StatusCode TrkV0VertexFitter::initialize()
60 {
61 if ( m_extrapolator.retrieve().isFailure() ) {
62 ATH_MSG_FATAL("Failed to retrieve tool " << m_extrapolator);
63 return StatusCode::FAILURE;
64 }
65 ATH_MSG_DEBUG( "Retrieved tool " << m_extrapolator );
66
67
68 ATH_CHECK( m_fieldCacheCondObjInputKey.initialize() );
69
70 ATH_MSG_DEBUG( "Initialize successful");
71 return StatusCode::SUCCESS;
72 }
73
74 StatusCode TrkV0VertexFitter::finalize()
75 {
76 ATH_MSG_DEBUG( "Finalize successful" );
77 return StatusCode::SUCCESS;
78 }
79
80
82 std::unique_ptr<xAOD::Vertex> TrkV0VertexFitter::fit(const EventContext& ctx,
83 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(ctx, vectorTrk, masses, constraintMass, pointingVertex, firstStartingPoint);
90 }
91
93 std::unique_ptr<xAOD::Vertex> TrkV0VertexFitter::fit(const EventContext& ctx,
94 const std::vector<const xAOD::TrackParticle*>& vectorTrk,
95 const xAOD::Vertex& firstStartingPoint) const
96 {
97 std::vector<double> masses;
98 double constraintMass = -9999.;
99 xAOD::Vertex * pointingVertex = nullptr;
100 const Amg::Vector3D& startingPoint = firstStartingPoint.position();
101 return fit(ctx, vectorTrk, masses, constraintMass, pointingVertex, startingPoint);
102 }
103
105 std::unique_ptr<xAOD::Vertex> TrkV0VertexFitter::fit(const EventContext& ctx,
106 const std::vector<const xAOD::TrackParticle*>& vectorTrk) const
107 {
108 Amg::Vector3D tmpVtx;
109 tmpVtx.setZero();
110 return fit(ctx, vectorTrk, tmpVtx);
111 }
112
114 std::unique_ptr<xAOD::Vertex> TrkV0VertexFitter::fit(const EventContext& ctx,
115 const std::vector<const xAOD::TrackParticle*> & vectorTrk,
116 const std::vector<double>& masses,
117 const double& constraintMass,
118 const xAOD::Vertex* pointingVertex,
119 const Amg::Vector3D& firstStartingPoint) const
120 {
121 std::vector<const Trk::TrackParameters*> measuredPerigees;
122 std::vector<const Trk::TrackParameters*> measuredPerigees_delete;
123 for (const xAOD::TrackParticle* p : vectorTrk)
124 {
125 if (m_firstMeas) {
126 unsigned int indexFMP;
127 if (p->indexOfParameterAtPosition(indexFMP, xAOD::FirstMeasurement)) {
128 measuredPerigees.push_back(new CurvilinearParameters(p->curvilinearParameters(indexFMP)));
129 measuredPerigees_delete.push_back(measuredPerigees.back());
130 ATH_MSG_DEBUG("first measurement on track exists");
131 ATH_MSG_DEBUG("first measurement " << p->curvilinearParameters(indexFMP));
132 ATH_MSG_DEBUG("first measurement covariance " << *(p->curvilinearParameters(indexFMP)).covariance());
133 } else {
134 Amg::Transform3D CylTrf;
135 CylTrf.setIdentity();
136 Trk::CylinderSurface estimationCylinder(CylTrf, p->radiusOfFirstHit(), 10e10);
137 const Trk::TrackParameters* chargeParameters = &p->perigeeParameters();
138 MaterialUpdateMode mode = Trk::removeNoise;
139
140 const Trk::TrackParameters* extrapolatedPerigee =
141 std::abs(chargeParameters->position().z()) > m_maxZ ? nullptr :
142 m_extrapolator->extrapolate(ctx,
143 *chargeParameters,
144 estimationCylinder,
145 Trk::alongMomentum,
146 true,
147 Trk::pion,
148 mode).release();
149
150 if (extrapolatedPerigee != nullptr) {
151 ATH_MSG_DEBUG("extrapolated to first measurement");
152 measuredPerigees.push_back (extrapolatedPerigee);
153 measuredPerigees_delete.push_back (extrapolatedPerigee);
154 } else {
155
156 extrapolatedPerigee =
157 std::abs(chargeParameters->position().z()) > m_maxZ ? nullptr :
158 m_extrapolator->extrapolateDirectly(ctx,
159 *chargeParameters,
160 estimationCylinder,
161 Trk::alongMomentum,
162 true,
163 Trk::pion).release();
164
165 if (extrapolatedPerigee != nullptr) {
166 ATH_MSG_DEBUG( "extrapolated (direct) to first measurement");
167 measuredPerigees.push_back (extrapolatedPerigee);
168 measuredPerigees_delete.push_back (extrapolatedPerigee);
169 } else {
170 ATH_MSG_DEBUG("Failed to extrapolate to the first measurement on track, using Perigee parameters");
171 measuredPerigees.push_back (&p->perigeeParameters());
172 }
173 }
174 }
175 } else {
176 measuredPerigees.push_back (&p->perigeeParameters());
177 }
178 }
179
180 std::unique_ptr<xAOD::Vertex> fittedVxCandidate = fit(ctx, measuredPerigees, masses, constraintMass, pointingVertex, firstStartingPoint);
181
182 // assign the used tracks to the V0Candidate
183 if (fittedVxCandidate) {
184 for (const xAOD::TrackParticle* p : vectorTrk)
185 {
186 ElementLink<xAOD::TrackParticleContainer> el;
187 el.setElement(p);
188 fittedVxCandidate->addTrackAtVertex (el);
189 }
190 }
191
192 for (const auto *ptr : measuredPerigees_delete){ delete ptr; }
193
194 return fittedVxCandidate;
195 }
196
197
198
200 std::unique_ptr<xAOD::Vertex> TrkV0VertexFitter::fit(const EventContext& ctx,
201 const std::vector<const Trk::TrackParameters*> & originalPerigees,
202 const Amg::Vector3D& firstStartingPoint) const
203 {
204 std::vector<double> masses;
205 double constraintMass = -9999.;
206 xAOD::Vertex * pointingVertex = nullptr;
207 return fit(ctx, originalPerigees, masses, constraintMass, pointingVertex, firstStartingPoint);
208 }
209
211 std::unique_ptr<xAOD::Vertex> TrkV0VertexFitter::fit(const EventContext& ctx,
212 const std::vector<const Trk::TrackParameters*> & originalPerigees,
213 const xAOD::Vertex& firstStartingPoint) const
214 {
215 std::vector<double> masses;
216 double constraintMass = -9999.;
217 xAOD::Vertex * pointingVertex = nullptr;
218 const Amg::Vector3D& startingPoint = firstStartingPoint.position();
219 return fit(ctx, originalPerigees, masses, constraintMass, pointingVertex, startingPoint);
220 }
221
223 std::unique_ptr<xAOD::Vertex> TrkV0VertexFitter::fit(const EventContext& ctx,
224 const std::vector<const Trk::TrackParameters*>& originalPerigees) const
225 {
226 Amg::Vector3D tmpVtx;
227 tmpVtx.setZero();
228 return fit(ctx, originalPerigees, tmpVtx);
229 }
230
232 std::unique_ptr<xAOD::Vertex> TrkV0VertexFitter::fit(const EventContext& ctx,
233 const std::vector<const Trk::TrackParameters*>& originalPerigees,
234 const std::vector<double>& masses,
235 const double& constraintMass,
236 const xAOD::Vertex* pointingVertex,
237 const Amg::Vector3D& firstStartingPoint) const
238 {
239 if ( originalPerigees.empty() )
240 {
241 ATH_MSG_DEBUG("No tracks to fit in this event.");
242 return nullptr;
243 }
244
245 // Initialisation of variables
246 bool pointingConstraint = false;
247 bool massConstraint = false;
248 if(constraintMass > -100.) massConstraint = true;
249 bool conversion = false;
250 if(constraintMass == 0. && originalPerigees.size() == 2) conversion = true;
251 double x_point=0., y_point=0., z_point=0.;
252 AmgSymMatrix(3) pointingVertexCov; pointingVertexCov.setIdentity();
253 if (pointingVertex != nullptr) {
254 if (pointingVertex->covariancePosition().trace() != 0.) {
255 pointingConstraint = true;
256 Amg::Vector3D pv = pointingVertex->position();
257 x_point = pv.x();
258 y_point = pv.y();
259 z_point = pv.z();
260 pointingVertexCov = pointingVertex->covariancePosition().inverse();
261 }
262 }
263
264 if (msgLvl(MSG::DEBUG)) {
265 msg(MSG::DEBUG) << "massConstraint " << massConstraint << " pointingConstraint " << pointingConstraint << " conversion " << conversion << endmsg;
266 msg(MSG::DEBUG) << "V0Fitter called with: " << endmsg;
267 if (massConstraint && !masses.empty()) msg(MSG::DEBUG) << "mass constraint, V0Mass = " << constraintMass << " particle masses " << masses << endmsg;
268 if (pointingConstraint) msg(MSG::DEBUG) << "pointing constraint, x = " << x_point << " y = " << y_point << " z = " << z_point << endmsg;
269 }
270
271 bool restartFit = true;
272 double chi2 = 2000000000000.;
273 unsigned int nTrk = originalPerigees.size(); // Number of tracks to fit
274 unsigned int nMeas = 5*nTrk; // Number of measurements
275 unsigned int nVert = 1; // Number of vertices
276
277 unsigned int nCnst = 2*nTrk; // Number of constraint equations
278 unsigned int nPntC = 2; // Contribution from pointing constraint in 2D
279 unsigned int nMass = 1; // Contribution from mass constraint
280
281 if (massConstraint) {
282 nCnst = nCnst + nMass;
283 }
284 if (pointingConstraint) {
285 nCnst = nCnst + nPntC;
286 nMeas = nMeas + 3;
287 nVert = nVert + 1;
288 }
289
290 unsigned int nPar = 5*nTrk + 3*nVert; // Number of parameters
291 int ndf = nMeas - (nPar - nCnst); // Number of degrees of freedom
292 if (ndf < 0) {ndf = 1;}
293
294 unsigned int dim = nCnst; //
295 unsigned int n_dim = nMeas; //
296
297 ATH_MSG_DEBUG("ndf " << ndf << " n_dim " << n_dim << " dim " << dim);
298
299 std::vector<V0FitterTrack> v0FitterTracks;
300
301 Amg::VectorX Y_vec(n_dim); Y_vec.setZero();
302 Amg::VectorX Y0_vec(n_dim); Y0_vec.setZero();
303 Amg::Vector3D A_vec; A_vec.setZero();
304
305 Amg::MatrixX Wmeas_mat(n_dim,n_dim); Wmeas_mat.setZero();
306 Amg::MatrixX Wmeas0_mat(n_dim,n_dim); Wmeas0_mat.setZero();
307 Amg::MatrixX Bjac_mat(dim,n_dim); Bjac_mat.setZero();
308 Amg::MatrixX Ajac_mat(dim,3); Ajac_mat.setZero();
309 Amg::MatrixX C11_mat(n_dim,n_dim); C11_mat.setZero();
310 Amg::MatrixX C22_mat(3,3); C22_mat.setZero();
311 Amg::MatrixX C21_mat(3,n_dim); C21_mat.setZero();
312 Amg::MatrixX C31_mat(dim,n_dim); C31_mat.setZero();
313 Amg::MatrixX C32_mat(dim,3); C32_mat.setZero();
314 Amg::MatrixX Wb_mat(dim,dim); Wb_mat.setZero();
315 Amg::MatrixX Btemp_mat(dim,n_dim); Btemp_mat.setZero();
316 Amg::MatrixX Atemp_mat(dim,3); Atemp_mat.setZero();
317 Amg::VectorX DeltaY_vec(n_dim); DeltaY_vec.setZero();
318 Amg::Vector3D DeltaA_vec; DeltaA_vec.setZero();
319 Amg::VectorX DeltaY0_vec(n_dim); DeltaY0_vec.setZero();
320 Amg::VectorX F_vec(dim); F_vec.setZero();
321 Amg::VectorX C_vec(dim); C_vec.setZero();
322 Amg::VectorX C_cor_vec(dim); C_cor_vec.setZero();
323 Amg::MatrixX V_mat(nPar,nPar); V_mat.setZero();
324 Amg::MatrixX Chi_vec(1,n_dim); Chi_vec.setZero();
325 AmgSymMatrix(1) Chi_mat; Chi_mat.setZero();
326 Amg::MatrixX ChiItr_vec(1,n_dim); ChiItr_vec.setZero();
327 AmgSymMatrix(1) ChiItr_mat; ChiItr_mat.setZero();
328 Amg::VectorX F_fac_vec(dim); F_fac_vec.setZero();
329
330 const Amg::Vector3D * globalPosition = &(firstStartingPoint);
331 ATH_MSG_DEBUG("globalPosition of starting point: " << (*globalPosition)[0] << ", " << (*globalPosition)[1] << ", " << (*globalPosition)[2]);
332
333 if (globalPosition->perp() > m_maxR && globalPosition->z() > m_maxZ) return nullptr;
334
335 SG::ReadCondHandle<AtlasFieldCacheCondObj> readHandle{m_fieldCacheCondObjInputKey, ctx};
336 if (!readHandle.isValid()) {
337 std::string msg = "Failed to retrieve magmnetic field conditions data ";
338 msg += m_fieldCacheCondObjInputKey.key();
339 throw std::runtime_error(msg);
340 }
341 const AtlasFieldCacheCondObj* fieldCondObj{*readHandle};
342 if (!fieldCondObj){
343 ATH_MSG_ERROR("fieldCondObj is nullptr");
344 return nullptr;
345 }
346 MagField::AtlasFieldCache fieldCache;
347 fieldCondObj->getInitializedCache (fieldCache);
348
349 // magnetic field
350 double BField[3];
351 fieldCache.getField(globalPosition->data(),BField);
352 double B_z = BField[2]*299.792; // should be in GeV/mm
353 if (B_z == 0. || std::isnan(B_z)) {
354 ATH_MSG_DEBUG("Could not find a magnetic field different from zero: very very strange");
355 B_z = 0.60407; // Value in GeV/mm (ATLAS units)
356 } else {
357 ATH_MSG_VERBOSE("Magnetic field projection of z axis in the perigee position is: " << B_z << " GeV/mm ");
358 }
359// double B_z = 1.998*0.3;
360
361
362 v0FitterTracks.clear();
363 Trk::PerigeeSurface perigeeSurface(*globalPosition);
364 // Extrapolate the perigees to the startpoint of the fit
365 for (const Trk::TrackParameters* chargeParameters : originalPerigees)
366 {
367 if (chargeParameters != nullptr)
368 {
369 // Correct material changes
370 const Amg::Vector3D gMomentum = chargeParameters->momentum();
371 const Amg::Vector3D gDirection = chargeParameters->position() - *globalPosition;
372 const double extrapolationDirection = gMomentum.dot( gDirection );
373 MaterialUpdateMode mode = Trk::removeNoise;
374 if(extrapolationDirection > 0) mode = Trk::addNoise;
375 std::unique_ptr<const Trk::Perigee> extrapolatedPerigee(nullptr);
376
377 std::unique_ptr<const Trk::TrackParameters> tmp =
378 std::abs(chargeParameters->position().z()) > m_maxZ ? nullptr :
379 m_extrapolator->extrapolate(ctx,
380 *chargeParameters,
381 perigeeSurface,
382 Trk::anyDirection,
383 true,
384 Trk::pion,
385 mode);
386
387 //if of right type we want to pass ownership
388 if (tmp && tmp->associatedSurface().type() == Trk::SurfaceType::Perigee) {
389 extrapolatedPerigee.reset(static_cast<const Trk::Perigee*>(tmp.release()));
390 }
391
392 if (extrapolatedPerigee == nullptr) {
393 ATH_MSG_DEBUG("Perigee was not extrapolated! Taking original one!");
394 const Trk::Perigee* tmpPerigee = dynamic_cast<const Trk::Perigee*>(chargeParameters);
395 if (tmpPerigee!=nullptr) extrapolatedPerigee = std::make_unique<Trk::Perigee>(*tmpPerigee);
396 else return nullptr;
397 }
398
399 // store track parameters at starting point
400 V0FitterTrack locV0FitterTrack{};
401 locV0FitterTrack.TrkPar[0] = extrapolatedPerigee->parameters()[Trk::d0];
402 locV0FitterTrack.TrkPar[1] = extrapolatedPerigee->parameters()[Trk::z0];
403 locV0FitterTrack.TrkPar[2] = extrapolatedPerigee->parameters()[Trk::phi];
404 locV0FitterTrack.TrkPar[3] = extrapolatedPerigee->parameters()[Trk::theta];
405 locV0FitterTrack.TrkPar[4] = extrapolatedPerigee->parameters()[Trk::qOverP];
406 locV0FitterTrack.Wi_mat = extrapolatedPerigee->covariance()->inverse().eval();
407 locV0FitterTrack.originalPerigee = chargeParameters;
408 v0FitterTracks.push_back(locV0FitterTrack);
409 } else {
410 ATH_MSG_DEBUG("Track parameters are not charged tracks ... fit aborted");
411 return nullptr;
412 }
413 }
414
415 // Iterate fits until the fit criteria are met, or the number of max iterations is reached
416 double chi2New=0.; double chi2Old=chi2;
417 double sumConstr=0.;
418 bool onConstr = false;
419 Amg::Vector3D frameOrigin = firstStartingPoint;
420 Amg::Vector3D frameOriginItr = firstStartingPoint;
421 for (int itr=0; itr < m_maxIterations; ++itr)
422 {
423 ATH_MSG_DEBUG("Iteration number: " << itr);
424 if (!restartFit) chi2Old = chi2New;
425 chi2New = 0.;
426
427 if (restartFit)
428 {
429 // ===> loop over tracks
430 std::vector<V0FitterTrack>::iterator PTIter;
431 int i=0;
432 for (PTIter = v0FitterTracks.begin(); PTIter != v0FitterTracks.end() ; ++PTIter)
433 {
434 V0FitterTrack locP((*PTIter));
435 Wmeas0_mat.block<5,5>(5*i,5*i) = locP.Wi_mat;
436 Wmeas_mat.block<5,5>(5*i,5*i) = locP.Wi_mat;
437 for (int j=0; j<5; ++j) {
438 Y0_vec(j+5*i) = locP.TrkPar[j];
439 }
440 ++i;
441 }
442 if(pointingConstraint) {
443 Y0_vec(5*nTrk + 0) = x_point;
444 Y0_vec(5*nTrk + 1) = y_point;
445 Y0_vec(5*nTrk + 2) = z_point;
446 Wmeas0_mat.block<3,3>(5*nTrk,5*nTrk) = pointingVertexCov;
447 Wmeas_mat.block<3,3>(5*nTrk,5*nTrk) = pointingVertexCov;
448 }
449 Wmeas_mat = Wmeas_mat.inverse();
450 }
451
452 Y_vec = Y0_vec + DeltaY_vec;
453 A_vec = DeltaA_vec;
454
455 // check theta and phi ranges
456 for (unsigned int i=0; i<nTrk; ++i)
457 {
458 if ( fabs ( Y_vec(2+5*i) ) > 100. || fabs ( Y_vec(3+5*i) ) > 100. ) { return nullptr; }
459 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;
460 while ( Y_vec(3+5*i) > 2*M_PI ) Y_vec(3+5*i) -= 2*M_PI;
461 while ( Y_vec(3+5*i) < -M_PI ) Y_vec(3+5*i) += M_PI;
462 if ( Y_vec(3+5*i) > M_PI )
463 {
464 Y_vec(3+5*i) = 2*M_PI - Y_vec(3+5*i);
465 if ( Y_vec(2+5*i) >= 0 ) Y_vec(2+5*i) += ( Y_vec(2+5*i) >0 ) ? -M_PI : M_PI;
466 }
467 if ( Y_vec(3+5*i) < 0.0 )
468 {
469 Y_vec(3+5*i) = - Y_vec(3+5*i);
470 if ( Y_vec(2+5*i) >= 0 ) Y_vec(2+5*i) += ( Y_vec(2+5*i) >0 ) ? -M_PI : M_PI;
471 }
472 }
473
474 double SigE=0., SigPx=0., SigPy=0., SigPz=0., Px=0., Py=0., Pz=0.;
475 Amg::VectorX rho(nTrk), Phi(nTrk), charge(nTrk);
476 rho.setZero(); Phi.setZero(); charge.setZero();
477 Amg::VectorX d0Cor(nTrk), d0Fac(nTrk), xcphiplusysphi(nTrk), xsphiminusycphi(nTrk);
478 d0Cor.setZero(); d0Fac.setZero(); xcphiplusysphi.setZero(); xsphiminusycphi.setZero();
479 AmgVector(2) conv_sign;
480 conv_sign[0] = -1; conv_sign[1] = 1;
481 for (unsigned int i=0; i<nTrk; ++i)
482 {
483 charge[i] = (Y_vec(4+5*i) < 0.) ? -1. : 1.;
484 rho[i] = sin(Y_vec(3+5*i))/(B_z*Y_vec(4+5*i));
485 xcphiplusysphi[i] = A_vec(0)*cos(Y_vec(2+5*i))+A_vec(1)*sin(Y_vec(2+5*i));
486 xsphiminusycphi[i] = A_vec(0)*sin(Y_vec(2+5*i))-A_vec(1)*cos(Y_vec(2+5*i));
487 if(fabs(-xcphiplusysphi[i]/rho[i]) > 1.) return nullptr;
488 d0Cor[i] = 0.5*asin(-xcphiplusysphi[i]/rho[i]);
489 double d0Facsq = 1. - xcphiplusysphi[i]*xcphiplusysphi[i]/(rho[i]*rho[i]);
490 d0Fac[i] = (d0Facsq>0.) ? sqrt(d0Facsq) : 0;
491 Phi[i] = Y_vec(2+5*i) + 2.*d0Cor[i];
492
493 if(massConstraint && !masses.empty() && masses[i] != 0.){
494 SigE += sqrt(1./(Y_vec(4+5*i)*Y_vec(4+5*i)) + masses[i]*masses[i]);
495 SigPx += sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
496 SigPy += sin(Y_vec(3+5*i))*sin(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
497 SigPz += cos(Y_vec(3+5*i))*charge[i]/Y_vec(4+5*i);
498 }
499 Px += sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
500 Py += sin(Y_vec(3+5*i))*sin(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
501 Pz += cos(Y_vec(3+5*i))*charge[i]/Y_vec(4+5*i);
502 }
503
504 double FMass=0., dFMassdxs=0., dFMassdys=0., dFMassdzs=0.;
505 double FPxy=0., dFPxydxs=0., dFPxydys=0., dFPxydzs=0., dFPxydxp=0., dFPxydyp=0., dFPxydzp=0.;
506 double FPxz=0., dFPxzdxs=0., dFPxzdys=0., dFPxzdzs=0., dFPxzdxp=0., dFPxzdyp=0., dFPxzdzp=0.;
507 Amg::VectorX Fxy(nTrk), Fxz(nTrk), dFMassdPhi(nTrk);
508 Fxy.setZero(); Fxz.setZero(); dFMassdPhi.setZero();
509 Amg::VectorX drhodtheta(nTrk), drhodqOverP(nTrk), csplusbc(nTrk), ccminusbs(nTrk);
510 drhodtheta.setZero(); drhodqOverP.setZero(); csplusbc.setZero(); ccminusbs.setZero();
511 Amg::VectorX dFxydd0(nTrk), dFxydz0(nTrk), dFxydphi(nTrk), dFxydtheta(nTrk), dFxydqOverP(nTrk);
512 dFxydd0.setZero(); dFxydz0.setZero(); dFxydphi.setZero(); dFxydtheta.setZero(); dFxydqOverP.setZero();
513 Amg::VectorX dFxydxs(nTrk), dFxydys(nTrk), dFxydzs(nTrk);
514 dFxydxs.setZero(); dFxydys.setZero(); dFxydzs.setZero();
515 Amg::VectorX dFxzdd0(nTrk), dFxzdz0(nTrk), dFxzdphi(nTrk), dFxzdtheta(nTrk), dFxzdqOverP(nTrk);
516 dFxzdd0.setZero(); dFxzdz0.setZero(); dFxzdphi.setZero(); dFxzdtheta.setZero(); dFxzdqOverP.setZero();
517 Amg::VectorX dFxzdxs(nTrk), dFxzdys(nTrk), dFxzdzs(nTrk);
518 dFxzdxs.setZero(); dFxzdys.setZero(); dFxzdzs.setZero();
519 Amg::VectorX dFMassdd0(nTrk), dFMassdz0(nTrk), dFMassdphi(nTrk), dFMassdtheta(nTrk), dFMassdqOverP(nTrk);
520 dFMassdd0.setZero(); dFMassdz0.setZero(); dFMassdphi.setZero(); dFMassdtheta.setZero(); dFMassdqOverP.setZero();
521 Amg::VectorX dFPxydd0(nTrk), dFPxydz0(nTrk), dFPxydphi(nTrk), dFPxydtheta(nTrk), dFPxydqOverP(nTrk);
522 dFPxydd0.setZero(); dFPxydz0.setZero(); dFPxydphi.setZero(); dFPxydtheta.setZero(); dFPxydqOverP.setZero();
523 Amg::VectorX dFPxzdd0(nTrk), dFPxzdz0(nTrk), dFPxzdphi(nTrk), dFPxzdtheta(nTrk), dFPxzdqOverP(nTrk);
524 dFPxzdd0.setZero(); dFPxzdz0.setZero(); dFPxzdphi.setZero(); dFPxzdtheta.setZero(); dFPxzdqOverP.setZero();
525 Amg::VectorX dPhidd0(nTrk), dPhidz0(nTrk), dPhidphi0(nTrk), dPhidtheta(nTrk), dPhidqOverP(nTrk);
526 dPhidd0.setZero(); dPhidz0.setZero(); dPhidphi0.setZero(); dPhidtheta.setZero(); dPhidqOverP.setZero();
527 Amg::VectorX dPhidxs(nTrk), dPhidys(nTrk), dPhidzs(nTrk);
528 dPhidxs.setZero(); dPhidys.setZero(); dPhidzs.setZero();
529 //
530 // constraint equations for V0vertex fitter
531 //
532 // FMass = mass vertex constraint
533 //
534 if (conversion) {
535 FMass = Phi[1] - Phi[0];
536 } else {
537 FMass = constraintMass*constraintMass - SigE*SigE + SigPx*SigPx + SigPy*SigPy + SigPz*SigPz;
538 }
539 //
540 // FPxy = pointing constraint in xy
541 //
542 FPxy = Px*(frameOriginItr[1] - y_point) - Py*(frameOriginItr[0]- x_point);
543 //
544 // FPxz = pointing constraint in xz
545 //
546 FPxz = Px*(frameOriginItr[2] - z_point) - Pz*(frameOriginItr[0]- x_point);
547
548 for (unsigned int i=0; i<nTrk; ++i)
549 {
550 //
551 // Fxy = vertex constraint in xy plane (one for each track)
552 //
553 Fxy[i] = Y_vec(0+5*i) + xsphiminusycphi[i] - 2.*rho[i]*sin(d0Cor[i])*sin(d0Cor[i]);
554 //
555 // Fxz = vertex constraint in xz plane (one for each track)
556 //
557 Fxz[i] = Y_vec(1+5*i) - A_vec(2) - rho[i]*2.*d0Cor[i]/tan(Y_vec(3+5*i));
558 //
559 // derivatives
560 //
561 drhodtheta[i] = cos(Y_vec(3+5*i))/(B_z*Y_vec(4+5*i));
562 drhodqOverP[i] = -sin(Y_vec(3+5*i))/(B_z*Y_vec(4+5*i)*Y_vec(4+5*i));
563
564 dFxydd0[i] = 1.;
565 dFxydphi[i] = xcphiplusysphi[i]*(1. + xsphiminusycphi[i]/(d0Fac[i]*rho[i]));
566 dFxydtheta[i] = (xcphiplusysphi[i]*xcphiplusysphi[i]/(d0Fac[i]*rho[i]*rho[i])-2.*sin(d0Cor[i])*sin(d0Cor[i]))*drhodtheta[i];
567 dFxydqOverP[i] = (xcphiplusysphi[i]*xcphiplusysphi[i]/(d0Fac[i]*rho[i]*rho[i])-2.*sin(d0Cor[i])*sin(d0Cor[i]))*drhodqOverP[i];
568 dFxydxs[i] = sin(Y_vec(2+5*i)) - cos(Y_vec(2+5*i))*xcphiplusysphi[i]/(d0Fac[i]*rho[i]);
569 dFxydys[i] = -cos(Y_vec(2+5*i)) - sin(Y_vec(2+5*i))*xcphiplusysphi[i]/(d0Fac[i]*rho[i]);
570
571 dFxzdz0[i] = 1.;
572 dFxzdphi[i] = -xsphiminusycphi[i]/(d0Fac[i]*tan(Y_vec(3+5*i)));
573 dFxzdtheta[i] = -((xcphiplusysphi[i]/(d0Fac[i]*rho[i]) + 2.*d0Cor[i])*tan(Y_vec(3+5*i))*drhodtheta[i] -
574 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)));
575 dFxzdqOverP[i] = -(xcphiplusysphi[i]/(d0Fac[i]*rho[i]) + 2.*d0Cor[i])*drhodqOverP[i]/tan(Y_vec(3+5*i));
576 dFxzdxs[i] = cos(Y_vec(2+5*i))/(d0Fac[i]*tan(Y_vec(3+5*i)));
577 dFxzdys[i] = sin(Y_vec(2+5*i))/(d0Fac[i]*tan(Y_vec(3+5*i)));
578 dFxzdzs[i] = -1.;
579
580 dPhidphi0[i] = 1. + xsphiminusycphi[i]/(d0Fac[i]*rho[i]);
581 dPhidtheta[i] = xcphiplusysphi[i]*drhodtheta[i]/(d0Fac[i]*rho[i]*rho[i]);
582 dPhidqOverP[i] = xcphiplusysphi[i]*drhodqOverP[i]/(d0Fac[i]*rho[i]*rho[i]);
583 dPhidxs[i] = -cos(Y_vec(2+5*i))/(d0Fac[i]*rho[i]);
584 dPhidys[i] = -sin(Y_vec(2+5*i))/(d0Fac[i]*rho[i]);
585
586 if (massConstraint && !masses.empty() && masses[i] != 0.){
587 if (conversion) {
588 dFMassdphi[i] = conv_sign[i]*dPhidphi0[i];
589 dFMassdtheta[i] = conv_sign[i]*dPhidtheta[i];
590 dFMassdqOverP[i] = conv_sign[i]*dPhidqOverP[i];
591 dFMassdxs += conv_sign[i]*dPhidxs[i];
592 dFMassdys += conv_sign[i]*dPhidys[i];
593 } else {
594 csplusbc[i] = SigPy*sin(Y_vec(2+5*i))+SigPx*cos(Y_vec(2+5*i));
595 ccminusbs[i] = SigPy*cos(Y_vec(2+5*i))-SigPx*sin(Y_vec(2+5*i));
596 dFMassdphi[i] = 2.*sin(Y_vec(3+5*i))*ccminusbs[i]*charge[i]/Y_vec(4+5*i);
597 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);
598 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)) -
599 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));
600 }
601 }
602
603 if (pointingConstraint){
604 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);
605 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);
606 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));
607 dFPxydxs += -sin(Y_vec(3+5*i))*sin(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
608 dFPxydys += sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
609 dFPxydxp += sin(Y_vec(3+5*i))*sin(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
610 dFPxydyp += -sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
611
612 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);
613 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)
614 +sin(Y_vec(3+5*i))*(frameOriginItr[0]-x_point)*charge[i]/Y_vec(4+5*i);
615 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))
616 +cos(Y_vec(3+5*i))*(frameOriginItr[0]-x_point)*charge[i]/(Y_vec(4+5*i)*Y_vec(4+5*i));
617 dFPxzdxs += -cos(Y_vec(3+5*i))*charge[i]/Y_vec(4+5*i);
618 dFPxzdzs += sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
619 dFPxzdxp += cos(Y_vec(3+5*i))*charge[i]/Y_vec(4+5*i);
620 dFPxzdzp += -sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
621 }
622
623 // fill vector of constraints
624 F_vec[i] = -Fxy[i];
625 F_vec[i+nTrk] = -Fxz[i];
626 F_fac_vec[i] = 1.;
627 F_fac_vec[i+nTrk] = 1.;
628 }
629 if(massConstraint) F_vec(2*nTrk+0) = -FMass;
630 //if(massConstraint) F_fac_vec(2*nTrk+0) = 1.;
631 if(massConstraint) F_fac_vec(2*nTrk+0) = 0.000001;
632 if(pointingConstraint) {
633 if(massConstraint) {
634 F_vec(2*nTrk+1) = -FPxy;
635 F_vec(2*nTrk+2) = -FPxz;
636 F_fac_vec(2*nTrk+1) = 0.000001;
637 F_fac_vec(2*nTrk+2) = 0.000001;
638 } else {
639 F_vec(2*nTrk+0) = -FPxy;
640 F_vec(2*nTrk+1) = -FPxz;
641 F_fac_vec(2*nTrk+0) = 0.000001;
642 F_fac_vec(2*nTrk+1) = 0.000001;
643 }
644 }
645
646 sumConstr = 0.;
647 for (unsigned int i=0; i<dim; ++i)
648 {
649 sumConstr += F_fac_vec[i]*fabs(F_vec[i]);
650 }
651 if ( std::isnan(sumConstr) ) { return nullptr; }
652 if (sumConstr < 0.001) { onConstr = true; }
653 ATH_MSG_DEBUG("sumConstr " << sumConstr);
654
655 for (unsigned int i=0; i<nTrk; ++i)
656 {
657 Bjac_mat(i,0+5*i) = dFxydd0(i);
658 Bjac_mat(i,1+5*i) = dFxydz0(i);
659 Bjac_mat(i,2+5*i) = dFxydphi(i);
660 Bjac_mat(i,3+5*i) = dFxydtheta(i);
661 Bjac_mat(i,4+5*i) = dFxydqOverP(i);
662 Bjac_mat(i+nTrk,0+5*i) = dFxzdd0(i);
663 Bjac_mat(i+nTrk,1+5*i) = dFxzdz0(i);
664 Bjac_mat(i+nTrk,2+5*i) = dFxzdphi(i);
665 Bjac_mat(i+nTrk,3+5*i) = dFxzdtheta(i);
666 Bjac_mat(i+nTrk,4+5*i) = dFxzdqOverP(i);
667 if(massConstraint) {
668 Bjac_mat(2*nTrk,0+5*i) = dFMassdd0(i);
669 Bjac_mat(2*nTrk,1+5*i) = dFMassdz0(i);
670 Bjac_mat(2*nTrk,2+5*i) = dFMassdphi(i);
671 Bjac_mat(2*nTrk,3+5*i) = dFMassdtheta(i);
672 Bjac_mat(2*nTrk,4+5*i) = dFMassdqOverP(i);
673 }
674 if(pointingConstraint) {
675 if(massConstraint) {
676 Bjac_mat(2*nTrk+1,0+5*i) = dFPxydd0(i);
677 Bjac_mat(2*nTrk+1,1+5*i) = dFPxydz0(i);
678 Bjac_mat(2*nTrk+1,2+5*i) = dFPxydphi(i);
679 Bjac_mat(2*nTrk+1,3+5*i) = dFPxydtheta(i);
680 Bjac_mat(2*nTrk+1,4+5*i) = dFPxydqOverP(i);
681 Bjac_mat(2*nTrk+1,5*nTrk) = dFPxydxp;
682 Bjac_mat(2*nTrk+1,5*nTrk+1) = dFPxydyp;
683 Bjac_mat(2*nTrk+1,5*nTrk+2) = dFPxydzp;
684 Bjac_mat(2*nTrk+2,0+5*i) = dFPxzdd0(i);
685 Bjac_mat(2*nTrk+2,1+5*i) = dFPxzdz0(i);
686 Bjac_mat(2*nTrk+2,2+5*i) = dFPxzdphi(i);
687 Bjac_mat(2*nTrk+2,3+5*i) = dFPxzdtheta(i);
688 Bjac_mat(2*nTrk+2,4+5*i) = dFPxzdqOverP(i);
689 Bjac_mat(2*nTrk+2,5*nTrk) = dFPxzdxp;
690 Bjac_mat(2*nTrk+2,5*nTrk+1) = dFPxzdyp;
691 Bjac_mat(2*nTrk+2,5*nTrk+2) = dFPxzdzp;
692 } else {
693 Bjac_mat(2*nTrk+0,0+5*i) = dFPxydd0(i);
694 Bjac_mat(2*nTrk+0,1+5*i) = dFPxydz0(i);
695 Bjac_mat(2*nTrk+0,2+5*i) = dFPxydphi(i);
696 Bjac_mat(2*nTrk+0,3+5*i) = dFPxydtheta(i);
697 Bjac_mat(2*nTrk+0,4+5*i) = dFPxydqOverP(i);
698 Bjac_mat(2*nTrk+0,5*nTrk) = dFPxydxp;
699 Bjac_mat(2*nTrk+0,5*nTrk+1) = dFPxydyp;
700 Bjac_mat(2*nTrk+0,5*nTrk+2) = dFPxydzp;
701 Bjac_mat(2*nTrk+1,0+5*i) = dFPxzdd0(i);
702 Bjac_mat(2*nTrk+1,1+5*i) = dFPxzdz0(i);
703 Bjac_mat(2*nTrk+1,2+5*i) = dFPxzdphi(i);
704 Bjac_mat(2*nTrk+1,3+5*i) = dFPxzdtheta(i);
705 Bjac_mat(2*nTrk+1,4+5*i) = dFPxzdqOverP(i);
706 Bjac_mat(2*nTrk+1,5*nTrk) = dFPxzdxp;
707 Bjac_mat(2*nTrk+1,5*nTrk+1) = dFPxzdyp;
708 Bjac_mat(2*nTrk+1,5*nTrk+2) = dFPxzdzp;
709 }
710 }
711
712 Ajac_mat(i,0) = dFxydxs(i);
713 Ajac_mat(i,1) = dFxydys(i);
714 Ajac_mat(i,2) = dFxydzs(i);
715 Ajac_mat(i+nTrk,0) = dFxzdxs(i);
716 Ajac_mat(i+nTrk,1) = dFxzdys(i);
717 Ajac_mat(i+nTrk,2) = dFxzdzs(i);
718 if(massConstraint) {
719 Ajac_mat(2*nTrk,0) = dFMassdxs;
720 Ajac_mat(2*nTrk,1) = dFMassdys;
721 Ajac_mat(2*nTrk,2) = dFMassdzs;
722 }
723 if(pointingConstraint) {
724 if(massConstraint) {
725 Ajac_mat(2*nTrk+1,0) = dFPxydxs;
726 Ajac_mat(2*nTrk+1,1) = dFPxydys;
727 Ajac_mat(2*nTrk+1,2) = dFPxydzs;
728 Ajac_mat(2*nTrk+2,0) = dFPxzdxs;
729 Ajac_mat(2*nTrk+2,1) = dFPxzdys;
730 Ajac_mat(2*nTrk+2,2) = dFPxzdzs;
731 } else {
732 Ajac_mat(2*nTrk+0,0) = dFPxydxs;
733 Ajac_mat(2*nTrk+0,1) = dFPxydys;
734 Ajac_mat(2*nTrk+0,2) = dFPxydzs;
735 Ajac_mat(2*nTrk+1,0) = dFPxzdxs;
736 Ajac_mat(2*nTrk+1,1) = dFPxzdys;
737 Ajac_mat(2*nTrk+1,2) = dFPxzdzs;
738 }
739 }
740 }
741
742 Wb_mat = Wmeas_mat.similarity(Bjac_mat) ;
743 Wb_mat = Wb_mat.inverse();
744
745 C22_mat = Wb_mat.similarity(Ajac_mat.transpose());
746 C22_mat = C22_mat.inverse();
747
748 Btemp_mat = Wb_mat * Bjac_mat * Wmeas_mat;
749 Atemp_mat = Wb_mat * Ajac_mat;
750
751 C21_mat = - C22_mat * Ajac_mat.transpose() * Btemp_mat;
752 C32_mat = Atemp_mat * C22_mat;
753 C31_mat = Btemp_mat + Atemp_mat * C21_mat;
754 Amg::MatrixX mat_prod_1 = Wmeas_mat * Bjac_mat.transpose();
755 Amg::MatrixX mat_prod_2 = Wmeas_mat * Bjac_mat.transpose() * Wb_mat * Ajac_mat;
756 C11_mat = Wmeas_mat - Wb_mat.similarity( mat_prod_1 ) + C22_mat.similarity( mat_prod_2 );
757
758 C_cor_vec = Ajac_mat*DeltaA_vec + Bjac_mat*DeltaY_vec;
759 C_vec = C_cor_vec + F_vec;
760
761 DeltaY_vec = C31_mat.transpose()*C_vec;
762 DeltaA_vec = C32_mat.transpose()*C_vec;
763
764 for (unsigned int i=0; i<n_dim; ++i)
765 {
766 ChiItr_vec(0,i) = DeltaY_vec(i);
767 }
768 ChiItr_mat = Wmeas0_mat.similarity( ChiItr_vec );
769 chi2New = ChiItr_mat(0,0);
770
771 // current vertex position in global coordinates
772 frameOriginItr[0] += DeltaA_vec(0);
773 frameOriginItr[1] += DeltaA_vec(1);
774 frameOriginItr[2] += DeltaA_vec(2);
775 if (msgLvl(MSG::DEBUG)) {
776 msg(MSG::DEBUG) << "New vertex, global coordinates: " << frameOriginItr.transpose() << endmsg;
777 msg(MSG::DEBUG) << "chi2Old: " << chi2Old << " chi2New: " << chi2New << " fabs(chi2Old-chi2New): " << fabs(chi2Old-chi2New) << endmsg;
778 }
779
780 const Amg::Vector3D * globalPositionItr = &frameOriginItr;
781 if (globalPositionItr->perp() > m_maxR && globalPositionItr->z() > m_maxZ) return nullptr;
782
783 if (onConstr && fabs(chi2Old-chi2New) < 0.1) { break; }
784
785 double BFieldItr[3];
786 fieldCache.getField(globalPositionItr->data(),BFieldItr);
787 double B_z_new = BFieldItr[2]*299.792; // should be in GeV/mm
788 if (B_z_new == 0. || std::isnan(B_z_new)) {
789 ATH_MSG_DEBUG("Using old B_z");
790 B_z_new = B_z;
791 }
792
793 restartFit = false;
794 double deltaR = sqrt(DeltaA_vec(0)*DeltaA_vec(0)+DeltaA_vec(1)*DeltaA_vec(1)+DeltaA_vec(2)*DeltaA_vec(2));
795 double deltaB_z = fabs(B_z-B_z_new)/B_z;
796 bool changeBz = false;
797
798 if (m_deltaR) {
799 if (deltaR > 5. && itr < m_maxIterations-1) changeBz = true;
800 } else {
801 if (deltaB_z > 0.000001 && itr < m_maxIterations-1) changeBz = true;
802 }
803
804 if (changeBz) {
805 B_z = B_z_new;
806
807 v0FitterTracks.clear();
808 Trk::PerigeeSurface perigeeSurfaceItr(*globalPositionItr);
809 // Extrapolate the perigees to the new startpoint of the fit
810 for (const Trk::TrackParameters* chargeParameters : originalPerigees)
811 {
812 if (chargeParameters != nullptr)
813 {
814 // Correct material changes
815 const Amg::Vector3D gMomentum = chargeParameters->momentum();
816 const Amg::Vector3D gDirection = chargeParameters->position() - *globalPositionItr;
817 const double extrapolationDirection = gMomentum .dot( gDirection );
818 MaterialUpdateMode mode = Trk::removeNoise;
819 if(extrapolationDirection > 0) mode = Trk::addNoise;
820 std::unique_ptr<const Trk::Perigee> extrapolatedPerigee(nullptr);
821
822 std::unique_ptr<const Trk::TrackParameters> tmp =
823 std::abs(chargeParameters->position().z()) > m_maxZ ? nullptr :
824 m_extrapolator->extrapolate(ctx,
825 *chargeParameters,
826 perigeeSurfaceItr,
827 Trk::anyDirection,
828 true,
829 Trk::pion,
830 mode);
831
832 // if of right type we want to pass ownership
833 if (tmp && tmp->associatedSurface().type() == Trk::SurfaceType::Perigee) {
834 extrapolatedPerigee.reset(
835 static_cast<const Trk::Perigee*>(tmp.release()));
836 }
837
838 if (extrapolatedPerigee == nullptr) {
839 ATH_MSG_DEBUG("Perigee was not extrapolated! Taking original one!");
840 const Trk::Perigee* tmpPerigee = dynamic_cast<const Trk::Perigee*>(chargeParameters);
841 if (tmpPerigee!=nullptr) extrapolatedPerigee = std::make_unique<Trk::Perigee>(*tmpPerigee);
842 else return nullptr;
843 }
844
845 // store track parameters at new starting point
846 V0FitterTrack locV0FitterTrack;
847 locV0FitterTrack.TrkPar[0] = extrapolatedPerigee->parameters()[Trk::d0];
848 locV0FitterTrack.TrkPar[1] = extrapolatedPerigee->parameters()[Trk::z0];
849 locV0FitterTrack.TrkPar[2] = extrapolatedPerigee->parameters()[Trk::phi];
850 locV0FitterTrack.TrkPar[3] = extrapolatedPerigee->parameters()[Trk::theta];
851 locV0FitterTrack.TrkPar[4] = extrapolatedPerigee->parameters()[Trk::qOverP];
852 locV0FitterTrack.Wi_mat = extrapolatedPerigee->covariance()->inverse().eval();
853 locV0FitterTrack.originalPerigee = chargeParameters;
854 v0FitterTracks.push_back(locV0FitterTrack);
855 } else {
856 ATH_MSG_DEBUG("Track parameters are not charged tracks ... fit aborted");
857 return nullptr;
858 }
859 }
860 frameOrigin = frameOriginItr;
861 Y0_vec *= 0.;
862 Y_vec *= 0.;
863 A_vec *= 0.;
864 DeltaY_vec *= 0.;
865 DeltaA_vec *= 0.;
866 chi2Old = 2000000000000.;
867 chi2New = 0.;
868 sumConstr = 0.;
869 onConstr = false;
870 restartFit = true;
871 }
872
873 //if (onConstr && fabs(chi2Old-chi2New) < 0.1) { break; }
874
875 } // end of iteration
876
877 frameOrigin[0] += DeltaA_vec(0);
878 frameOrigin[1] += DeltaA_vec(1);
879 frameOrigin[2] += DeltaA_vec(2);
880 if ( std::isnan(frameOrigin[0]) || std::isnan(frameOrigin[1]) || std::isnan(frameOrigin[2]) ) return nullptr;
881
882 Y_vec = Y0_vec + DeltaY_vec;
883
884 // check theta and phi ranges
885 for (unsigned int i=0; i<nTrk; ++i)
886 {
887 if ( fabs ( Y_vec(2+5*i) ) > 100. || fabs ( Y_vec(3+5*i) ) > 100. ) { return nullptr; }
888 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;
889 while ( Y_vec(3+5*i) > 2*M_PI ) Y_vec(3+5*i) -= 2*M_PI;
890 while ( Y_vec(3+5*i) < -M_PI ) Y_vec(3+5*i) += M_PI;
891 if ( Y_vec(3+5*i) > M_PI )
892 {
893 Y_vec(3+5*i) = 2*M_PI - Y_vec(3+5*i);
894 if ( Y_vec(2+5*i) >= 0 ) Y_vec(2+5*i) += ( Y_vec(2+5*i) >0 ) ? -M_PI : M_PI;
895 }
896 if ( Y_vec(3+5*i) < 0.0 )
897 {
898 Y_vec(3+5*i) = - Y_vec(3+5*i);
899 if ( Y_vec(2+5*i) >= 0 ) Y_vec(2+5*i) += ( Y_vec(2+5*i) >0 ) ? -M_PI : M_PI;
900 }
901 }
902
903 for (unsigned int i=0; i<n_dim; ++i)
904 {
905 Chi_vec(0,i) = DeltaY_vec(i);
906 }
907 Chi_mat = Wmeas0_mat.similarity( Chi_vec );
908 chi2 = Chi_mat(0,0);
909
910 V_mat.setZero();
911 V_mat.block(0,0,n_dim,n_dim) = C11_mat;
912 V_mat.block<3,3>(n_dim,n_dim) = C22_mat;
913 V_mat.block(n_dim,0,3,n_dim) = C21_mat;
914 V_mat.block(0,n_dim,n_dim,3) = C21_mat.transpose();
915
916 // ===> loop over tracks
917 std::vector<V0FitterTrack>::iterator BTIter;
918 int iRP=0;
919 for (BTIter = v0FitterTracks.begin(); BTIter != v0FitterTracks.end() ; ++BTIter)
920 {
921 // chi2 per track
922 AmgSymMatrix(5) covTrk = Wmeas0_mat.block<5,5>(5*iRP,5*iRP);
923 AmgVector(5) chi_vec; chi_vec.setZero();
924 for (unsigned int i=0; i<5; ++i) chi_vec(i) = DeltaY_vec(i+5*iRP);
925 double chi2Trk = chi_vec.dot(covTrk*chi_vec);
926 (*BTIter).chi2=chi2Trk;
927 iRP++;
928 }
929
930 // Store the vertex
931 auto vx = std::make_unique<xAOD::Vertex>();
932 vx->makePrivateStore();
933 vx->setPosition (frameOrigin);
934 vx->setCovariancePosition (C22_mat);
935 vx->setFitQuality(chi2,static_cast<float>(ndf));
936 vx->setVertexType(xAOD::VxType::V0Vtx);
937
938 // Store the tracks at vertex
939 std::vector<VxTrackAtVertex> & tracksAtVertex = vx->vxTrackAtVertex(); tracksAtVertex.clear();
940 Amg::Vector3D Vertex(frameOrigin[0],frameOrigin[1],frameOrigin[2]);
941 const Trk::PerigeeSurface Surface(Vertex);
942 Trk::Perigee * refittedPerigee(nullptr);
943 unsigned int iterf=0;
944 std::vector<V0FitterTrack>::iterator BTIterf;
945 for (BTIterf = v0FitterTracks.begin(); BTIterf != v0FitterTracks.end() ; ++BTIterf)
946 {
947 AmgSymMatrix(5) CovMtxP = V_mat.block<5,5>(5*iterf, 5*iterf);
948 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),
949 Surface, std::move(CovMtxP));
950 tracksAtVertex.emplace_back((*BTIterf).chi2, refittedPerigee, (*BTIterf).originalPerigee);
951 iterf++;
952 }
953
954 // Full Covariance Matrix
955 unsigned int sfcmv = nPar*(nPar+1)/2;
956 std::vector<float> floatErrMtx(sfcmv,0.);
957 unsigned int ipnt = 0;
958 for (unsigned int i=0; i<nPar; ++i) {
959 for (unsigned int j=0; j<i+1; ++j) {
960 floatErrMtx[ipnt++]=V_mat(i,j);
961 }
962 }
963 vx->setCovariance(floatErrMtx);
964
965 return vx;
966 }
967
968
969} //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:61
ATH_CHECK
#define ATH_CHECK
Evaluate an expression and check for errors.
Definition AthCheckMacros.h:40
ATH_MSG_ERROR
#define ATH_MSG_ERROR(x)
Definition AthMsgStreamMacros.h:33
ATH_MSG_FATAL
#define ATH_MSG_FATAL(x)
Definition AthMsgStreamMacros.h:34
ATH_MSG_VERBOSE
#define ATH_MSG_VERBOSE(x)
Definition AthMsgStreamMacros.h:28
ATH_MSG_DEBUG
#define ATH_MSG_DEBUG(x)
Definition AthMsgStreamMacros.h:29
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:59
Trk::TrkV0VertexFitter::TrkV0VertexFitter
TrkV0VertexFitter(const std::string &t, const std::string &n, const IInterface *p)
Definition TrkV0VertexFitter.cxx:38
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:74
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:82
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:47
Amg::VectorX
Eigen::Matrix< double, Eigen::Dynamic, 1 > VectorX
Dynamic Vector - dynamic allocation.
Definition EventPrimitives.h:30
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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