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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
343 MagField::AtlasFieldCache fieldCache;
344 fieldCondObj->getInitializedCache (fieldCache);
345
346 // magnetic field
347 double BField[3];
348 fieldCache.getField(globalPosition->data(),BField);
349 double B_z = BField[2]*299.792; // should be in GeV/mm
350 if (B_z == 0. || std::isnan(B_z)) {
351 ATH_MSG_DEBUG("Could not find a magnetic field different from zero: very very strange");
352 B_z = 0.60407; // Value in GeV/mm (ATLAS units)
353 } else {
354 ATH_MSG_VERBOSE("Magnetic field projection of z axis in the perigee position is: " << B_z << " GeV/mm ");
355 }
356// double B_z = 1.998*0.3;
357
358
359 v0FitterTracks.clear();
360 Trk::PerigeeSurface perigeeSurface(*globalPosition);
361 // Extrapolate the perigees to the startpoint of the fit
362 for (const Trk::TrackParameters* chargeParameters : originalPerigees)
363 {
364 if (chargeParameters != nullptr)
365 {
366 // Correct material changes
367 const Amg::Vector3D gMomentum = chargeParameters->momentum();
368 const Amg::Vector3D gDirection = chargeParameters->position() - *globalPosition;
369 const double extrapolationDirection = gMomentum.dot( gDirection );
370 MaterialUpdateMode mode = Trk::removeNoise;
371 if(extrapolationDirection > 0) mode = Trk::addNoise;
372 std::unique_ptr<const Trk::Perigee> extrapolatedPerigee(nullptr);
373
374 std::unique_ptr<const Trk::TrackParameters> tmp =
375 std::abs(chargeParameters->position().z()) > m_maxZ ? nullptr :
376 m_extrapolator->extrapolate(ctx,
377 *chargeParameters,
378 perigeeSurface,
379 Trk::anyDirection,
380 true,
381 Trk::pion,
382 mode);
383
384 //if of right type we want to pass ownership
385 if (tmp && tmp->associatedSurface().type() == Trk::SurfaceType::Perigee) {
386 extrapolatedPerigee.reset(static_cast<const Trk::Perigee*>(tmp.release()));
387 }
388
389 if (extrapolatedPerigee == nullptr) {
390 ATH_MSG_DEBUG("Perigee was not extrapolated! Taking original one!");
391 const Trk::Perigee* tmpPerigee = dynamic_cast<const Trk::Perigee*>(chargeParameters);
392 if (tmpPerigee!=nullptr) extrapolatedPerigee = std::make_unique<Trk::Perigee>(*tmpPerigee);
393 else return nullptr;
394 }
395
396 // store track parameters at starting point
397 V0FitterTrack locV0FitterTrack;
398 locV0FitterTrack.TrkPar[0] = extrapolatedPerigee->parameters()[Trk::d0];
399 locV0FitterTrack.TrkPar[1] = extrapolatedPerigee->parameters()[Trk::z0];
400 locV0FitterTrack.TrkPar[2] = extrapolatedPerigee->parameters()[Trk::phi];
401 locV0FitterTrack.TrkPar[3] = extrapolatedPerigee->parameters()[Trk::theta];
402 locV0FitterTrack.TrkPar[4] = extrapolatedPerigee->parameters()[Trk::qOverP];
403 locV0FitterTrack.Wi_mat = extrapolatedPerigee->covariance()->inverse().eval();
404 locV0FitterTrack.originalPerigee = chargeParameters;
405 v0FitterTracks.push_back(locV0FitterTrack);
406 } else {
407 ATH_MSG_DEBUG("Track parameters are not charged tracks ... fit aborted");
408 return nullptr;
409 }
410 }
411
412 // Iterate fits until the fit criteria are met, or the number of max iterations is reached
413 double chi2New=0.; double chi2Old=chi2;
414 double sumConstr=0.;
415 bool onConstr = false;
416 Amg::Vector3D frameOrigin = firstStartingPoint;
417 Amg::Vector3D frameOriginItr = firstStartingPoint;
418 for (int itr=0; itr < m_maxIterations; ++itr)
419 {
420 ATH_MSG_DEBUG("Iteration number: " << itr);
421 if (!restartFit) chi2Old = chi2New;
422 chi2New = 0.;
423
424 if (restartFit)
425 {
426 // ===> loop over tracks
427 std::vector<V0FitterTrack>::iterator PTIter;
428 int i=0;
429 for (PTIter = v0FitterTracks.begin(); PTIter != v0FitterTracks.end() ; ++PTIter)
430 {
431 V0FitterTrack locP((*PTIter));
432 Wmeas0_mat.block<5,5>(5*i,5*i) = locP.Wi_mat;
433 Wmeas_mat.block<5,5>(5*i,5*i) = locP.Wi_mat;
434 for (int j=0; j<5; ++j) {
435 Y0_vec(j+5*i) = locP.TrkPar[j];
436 }
437 ++i;
438 }
439 if(pointingConstraint) {
440 Y0_vec(5*nTrk + 0) = x_point;
441 Y0_vec(5*nTrk + 1) = y_point;
442 Y0_vec(5*nTrk + 2) = z_point;
443 Wmeas0_mat.block<3,3>(5*nTrk,5*nTrk) = pointingVertexCov;
444 Wmeas_mat.block<3,3>(5*nTrk,5*nTrk) = pointingVertexCov;
445 }
446 Wmeas_mat = Wmeas_mat.inverse();
447 }
448
449 Y_vec = Y0_vec + DeltaY_vec;
450 A_vec = DeltaA_vec;
451
452 // check theta and phi ranges
453 for (unsigned int i=0; i<nTrk; ++i)
454 {
455 if ( fabs ( Y_vec(2+5*i) ) > 100. || fabs ( Y_vec(3+5*i) ) > 100. ) { return nullptr; }
456 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;
457 while ( Y_vec(3+5*i) > 2*M_PI ) Y_vec(3+5*i) -= 2*M_PI;
458 while ( Y_vec(3+5*i) < -M_PI ) Y_vec(3+5*i) += M_PI;
459 if ( Y_vec(3+5*i) > M_PI )
460 {
461 Y_vec(3+5*i) = 2*M_PI - Y_vec(3+5*i);
462 if ( Y_vec(2+5*i) >= 0 ) Y_vec(2+5*i) += ( Y_vec(2+5*i) >0 ) ? -M_PI : M_PI;
463 }
464 if ( Y_vec(3+5*i) < 0.0 )
465 {
466 Y_vec(3+5*i) = - Y_vec(3+5*i);
467 if ( Y_vec(2+5*i) >= 0 ) Y_vec(2+5*i) += ( Y_vec(2+5*i) >0 ) ? -M_PI : M_PI;
468 }
469 }
470
471 double SigE=0., SigPx=0., SigPy=0., SigPz=0., Px=0., Py=0., Pz=0.;
472 Amg::VectorX rho(nTrk), Phi(nTrk), charge(nTrk);
473 rho.setZero(); Phi.setZero(); charge.setZero();
474 Amg::VectorX d0Cor(nTrk), d0Fac(nTrk), xcphiplusysphi(nTrk), xsphiminusycphi(nTrk);
475 d0Cor.setZero(); d0Fac.setZero(); xcphiplusysphi.setZero(); xsphiminusycphi.setZero();
476 AmgVector(2) conv_sign;
477 conv_sign[0] = -1; conv_sign[1] = 1;
478 for (unsigned int i=0; i<nTrk; ++i)
479 {
480 charge[i] = (Y_vec(4+5*i) < 0.) ? -1. : 1.;
481 rho[i] = sin(Y_vec(3+5*i))/(B_z*Y_vec(4+5*i));
482 xcphiplusysphi[i] = A_vec(0)*cos(Y_vec(2+5*i))+A_vec(1)*sin(Y_vec(2+5*i));
483 xsphiminusycphi[i] = A_vec(0)*sin(Y_vec(2+5*i))-A_vec(1)*cos(Y_vec(2+5*i));
484 if(fabs(-xcphiplusysphi[i]/rho[i]) > 1.) return nullptr;
485 d0Cor[i] = 0.5*asin(-xcphiplusysphi[i]/rho[i]);
486 double d0Facsq = 1. - xcphiplusysphi[i]*xcphiplusysphi[i]/(rho[i]*rho[i]);
487 d0Fac[i] = (d0Facsq>0.) ? sqrt(d0Facsq) : 0;
488 Phi[i] = Y_vec(2+5*i) + 2.*d0Cor[i];
489
490 if(massConstraint && !masses.empty() && masses[i] != 0.){
491 SigE += sqrt(1./(Y_vec(4+5*i)*Y_vec(4+5*i)) + masses[i]*masses[i]);
492 SigPx += sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
493 SigPy += sin(Y_vec(3+5*i))*sin(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
494 SigPz += cos(Y_vec(3+5*i))*charge[i]/Y_vec(4+5*i);
495 }
496 Px += sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
497 Py += sin(Y_vec(3+5*i))*sin(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
498 Pz += cos(Y_vec(3+5*i))*charge[i]/Y_vec(4+5*i);
499 }
500
501 double FMass=0., dFMassdxs=0., dFMassdys=0., dFMassdzs=0.;
502 double FPxy=0., dFPxydxs=0., dFPxydys=0., dFPxydzs=0., dFPxydxp=0., dFPxydyp=0., dFPxydzp=0.;
503 double FPxz=0., dFPxzdxs=0., dFPxzdys=0., dFPxzdzs=0., dFPxzdxp=0., dFPxzdyp=0., dFPxzdzp=0.;
504 Amg::VectorX Fxy(nTrk), Fxz(nTrk), dFMassdPhi(nTrk);
505 Fxy.setZero(); Fxz.setZero(); dFMassdPhi.setZero();
506 Amg::VectorX drhodtheta(nTrk), drhodqOverP(nTrk), csplusbc(nTrk), ccminusbs(nTrk);
507 drhodtheta.setZero(); drhodqOverP.setZero(); csplusbc.setZero(); ccminusbs.setZero();
508 Amg::VectorX dFxydd0(nTrk), dFxydz0(nTrk), dFxydphi(nTrk), dFxydtheta(nTrk), dFxydqOverP(nTrk);
509 dFxydd0.setZero(); dFxydz0.setZero(); dFxydphi.setZero(); dFxydtheta.setZero(); dFxydqOverP.setZero();
510 Amg::VectorX dFxydxs(nTrk), dFxydys(nTrk), dFxydzs(nTrk);
511 dFxydxs.setZero(); dFxydys.setZero(); dFxydzs.setZero();
512 Amg::VectorX dFxzdd0(nTrk), dFxzdz0(nTrk), dFxzdphi(nTrk), dFxzdtheta(nTrk), dFxzdqOverP(nTrk);
513 dFxzdd0.setZero(); dFxzdz0.setZero(); dFxzdphi.setZero(); dFxzdtheta.setZero(); dFxzdqOverP.setZero();
514 Amg::VectorX dFxzdxs(nTrk), dFxzdys(nTrk), dFxzdzs(nTrk);
515 dFxzdxs.setZero(); dFxzdys.setZero(); dFxzdzs.setZero();
516 Amg::VectorX dFMassdd0(nTrk), dFMassdz0(nTrk), dFMassdphi(nTrk), dFMassdtheta(nTrk), dFMassdqOverP(nTrk);
517 dFMassdd0.setZero(); dFMassdz0.setZero(); dFMassdphi.setZero(); dFMassdtheta.setZero(); dFMassdqOverP.setZero();
518 Amg::VectorX dFPxydd0(nTrk), dFPxydz0(nTrk), dFPxydphi(nTrk), dFPxydtheta(nTrk), dFPxydqOverP(nTrk);
519 dFPxydd0.setZero(); dFPxydz0.setZero(); dFPxydphi.setZero(); dFPxydtheta.setZero(); dFPxydqOverP.setZero();
520 Amg::VectorX dFPxzdd0(nTrk), dFPxzdz0(nTrk), dFPxzdphi(nTrk), dFPxzdtheta(nTrk), dFPxzdqOverP(nTrk);
521 dFPxzdd0.setZero(); dFPxzdz0.setZero(); dFPxzdphi.setZero(); dFPxzdtheta.setZero(); dFPxzdqOverP.setZero();
522 Amg::VectorX dPhidd0(nTrk), dPhidz0(nTrk), dPhidphi0(nTrk), dPhidtheta(nTrk), dPhidqOverP(nTrk);
523 dPhidd0.setZero(); dPhidz0.setZero(); dPhidphi0.setZero(); dPhidtheta.setZero(); dPhidqOverP.setZero();
524 Amg::VectorX dPhidxs(nTrk), dPhidys(nTrk), dPhidzs(nTrk);
525 dPhidxs.setZero(); dPhidys.setZero(); dPhidzs.setZero();
526 //
527 // constraint equations for V0vertex fitter
528 //
529 // FMass = mass vertex constraint
530 //
531 if (conversion) {
532 FMass = Phi[1] - Phi[0];
533 } else {
534 FMass = constraintMass*constraintMass - SigE*SigE + SigPx*SigPx + SigPy*SigPy + SigPz*SigPz;
535 }
536 //
537 // FPxy = pointing constraint in xy
538 //
539 FPxy = Px*(frameOriginItr[1] - y_point) - Py*(frameOriginItr[0]- x_point);
540 //
541 // FPxz = pointing constraint in xz
542 //
543 FPxz = Px*(frameOriginItr[2] - z_point) - Pz*(frameOriginItr[0]- x_point);
544
545 for (unsigned int i=0; i<nTrk; ++i)
546 {
547 //
548 // Fxy = vertex constraint in xy plane (one for each track)
549 //
550 Fxy[i] = Y_vec(0+5*i) + xsphiminusycphi[i] - 2.*rho[i]*sin(d0Cor[i])*sin(d0Cor[i]);
551 //
552 // Fxz = vertex constraint in xz plane (one for each track)
553 //
554 Fxz[i] = Y_vec(1+5*i) - A_vec(2) - rho[i]*2.*d0Cor[i]/tan(Y_vec(3+5*i));
555 //
556 // derivatives
557 //
558 drhodtheta[i] = cos(Y_vec(3+5*i))/(B_z*Y_vec(4+5*i));
559 drhodqOverP[i] = -sin(Y_vec(3+5*i))/(B_z*Y_vec(4+5*i)*Y_vec(4+5*i));
560
561 dFxydd0[i] = 1.;
562 dFxydphi[i] = xcphiplusysphi[i]*(1. + xsphiminusycphi[i]/(d0Fac[i]*rho[i]));
563 dFxydtheta[i] = (xcphiplusysphi[i]*xcphiplusysphi[i]/(d0Fac[i]*rho[i]*rho[i])-2.*sin(d0Cor[i])*sin(d0Cor[i]))*drhodtheta[i];
564 dFxydqOverP[i] = (xcphiplusysphi[i]*xcphiplusysphi[i]/(d0Fac[i]*rho[i]*rho[i])-2.*sin(d0Cor[i])*sin(d0Cor[i]))*drhodqOverP[i];
565 dFxydxs[i] = sin(Y_vec(2+5*i)) - cos(Y_vec(2+5*i))*xcphiplusysphi[i]/(d0Fac[i]*rho[i]);
566 dFxydys[i] = -cos(Y_vec(2+5*i)) - sin(Y_vec(2+5*i))*xcphiplusysphi[i]/(d0Fac[i]*rho[i]);
567
568 dFxzdz0[i] = 1.;
569 dFxzdphi[i] = -xsphiminusycphi[i]/(d0Fac[i]*tan(Y_vec(3+5*i)));
570 dFxzdtheta[i] = -((xcphiplusysphi[i]/(d0Fac[i]*rho[i]) + 2.*d0Cor[i])*tan(Y_vec(3+5*i))*drhodtheta[i] -
571 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)));
572 dFxzdqOverP[i] = -(xcphiplusysphi[i]/(d0Fac[i]*rho[i]) + 2.*d0Cor[i])*drhodqOverP[i]/tan(Y_vec(3+5*i));
573 dFxzdxs[i] = cos(Y_vec(2+5*i))/(d0Fac[i]*tan(Y_vec(3+5*i)));
574 dFxzdys[i] = sin(Y_vec(2+5*i))/(d0Fac[i]*tan(Y_vec(3+5*i)));
575 dFxzdzs[i] = -1.;
576
577 dPhidphi0[i] = 1. + xsphiminusycphi[i]/(d0Fac[i]*rho[i]);
578 dPhidtheta[i] = xcphiplusysphi[i]*drhodtheta[i]/(d0Fac[i]*rho[i]*rho[i]);
579 dPhidqOverP[i] = xcphiplusysphi[i]*drhodqOverP[i]/(d0Fac[i]*rho[i]*rho[i]);
580 dPhidxs[i] = -cos(Y_vec(2+5*i))/(d0Fac[i]*rho[i]);
581 dPhidys[i] = -sin(Y_vec(2+5*i))/(d0Fac[i]*rho[i]);
582
583 if (massConstraint && !masses.empty() && masses[i] != 0.){
584 if (conversion) {
585 dFMassdphi[i] = conv_sign[i]*dPhidphi0[i];
586 dFMassdtheta[i] = conv_sign[i]*dPhidtheta[i];
587 dFMassdqOverP[i] = conv_sign[i]*dPhidqOverP[i];
588 dFMassdxs += conv_sign[i]*dPhidxs[i];
589 dFMassdys += conv_sign[i]*dPhidys[i];
590 } else {
591 csplusbc[i] = SigPy*sin(Y_vec(2+5*i))+SigPx*cos(Y_vec(2+5*i));
592 ccminusbs[i] = SigPy*cos(Y_vec(2+5*i))-SigPx*sin(Y_vec(2+5*i));
593 dFMassdphi[i] = 2.*sin(Y_vec(3+5*i))*ccminusbs[i]*charge[i]/Y_vec(4+5*i);
594 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);
595 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)) -
596 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));
597 }
598 }
599
600 if (pointingConstraint){
601 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);
602 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);
603 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));
604 dFPxydxs += -sin(Y_vec(3+5*i))*sin(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
605 dFPxydys += sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
606 dFPxydxp += sin(Y_vec(3+5*i))*sin(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
607 dFPxydyp += -sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
608
609 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);
610 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)
611 +sin(Y_vec(3+5*i))*(frameOriginItr[0]-x_point)*charge[i]/Y_vec(4+5*i);
612 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))
613 +cos(Y_vec(3+5*i))*(frameOriginItr[0]-x_point)*charge[i]/(Y_vec(4+5*i)*Y_vec(4+5*i));
614 dFPxzdxs += -cos(Y_vec(3+5*i))*charge[i]/Y_vec(4+5*i);
615 dFPxzdzs += sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
616 dFPxzdxp += cos(Y_vec(3+5*i))*charge[i]/Y_vec(4+5*i);
617 dFPxzdzp += -sin(Y_vec(3+5*i))*cos(Y_vec(2+5*i))*charge[i]/Y_vec(4+5*i);
618 }
619
620 // fill vector of constraints
621 F_vec[i] = -Fxy[i];
622 F_vec[i+nTrk] = -Fxz[i];
623 F_fac_vec[i] = 1.;
624 F_fac_vec[i+nTrk] = 1.;
625 }
626 if(massConstraint) F_vec(2*nTrk+0) = -FMass;
627 //if(massConstraint) F_fac_vec(2*nTrk+0) = 1.;
628 if(massConstraint) F_fac_vec(2*nTrk+0) = 0.000001;
629 if(pointingConstraint) {
630 if(massConstraint) {
631 F_vec(2*nTrk+1) = -FPxy;
632 F_vec(2*nTrk+2) = -FPxz;
633 F_fac_vec(2*nTrk+1) = 0.000001;
634 F_fac_vec(2*nTrk+2) = 0.000001;
635 } else {
636 F_vec(2*nTrk+0) = -FPxy;
637 F_vec(2*nTrk+1) = -FPxz;
638 F_fac_vec(2*nTrk+0) = 0.000001;
639 F_fac_vec(2*nTrk+1) = 0.000001;
640 }
641 }
642
643 sumConstr = 0.;
644 for (unsigned int i=0; i<dim; ++i)
645 {
646 sumConstr += F_fac_vec[i]*fabs(F_vec[i]);
647 }
648 if ( std::isnan(sumConstr) ) { return nullptr; }
649 if (sumConstr < 0.001) { onConstr = true; }
650 ATH_MSG_DEBUG("sumConstr " << sumConstr);
651
652 for (unsigned int i=0; i<nTrk; ++i)
653 {
654 Bjac_mat(i,0+5*i) = dFxydd0(i);
655 Bjac_mat(i,1+5*i) = dFxydz0(i);
656 Bjac_mat(i,2+5*i) = dFxydphi(i);
657 Bjac_mat(i,3+5*i) = dFxydtheta(i);
658 Bjac_mat(i,4+5*i) = dFxydqOverP(i);
659 Bjac_mat(i+nTrk,0+5*i) = dFxzdd0(i);
660 Bjac_mat(i+nTrk,1+5*i) = dFxzdz0(i);
661 Bjac_mat(i+nTrk,2+5*i) = dFxzdphi(i);
662 Bjac_mat(i+nTrk,3+5*i) = dFxzdtheta(i);
663 Bjac_mat(i+nTrk,4+5*i) = dFxzdqOverP(i);
664 if(massConstraint) {
665 Bjac_mat(2*nTrk,0+5*i) = dFMassdd0(i);
666 Bjac_mat(2*nTrk,1+5*i) = dFMassdz0(i);
667 Bjac_mat(2*nTrk,2+5*i) = dFMassdphi(i);
668 Bjac_mat(2*nTrk,3+5*i) = dFMassdtheta(i);
669 Bjac_mat(2*nTrk,4+5*i) = dFMassdqOverP(i);
670 }
671 if(pointingConstraint) {
672 if(massConstraint) {
673 Bjac_mat(2*nTrk+1,0+5*i) = dFPxydd0(i);
674 Bjac_mat(2*nTrk+1,1+5*i) = dFPxydz0(i);
675 Bjac_mat(2*nTrk+1,2+5*i) = dFPxydphi(i);
676 Bjac_mat(2*nTrk+1,3+5*i) = dFPxydtheta(i);
677 Bjac_mat(2*nTrk+1,4+5*i) = dFPxydqOverP(i);
678 Bjac_mat(2*nTrk+1,5*nTrk) = dFPxydxp;
679 Bjac_mat(2*nTrk+1,5*nTrk+1) = dFPxydyp;
680 Bjac_mat(2*nTrk+1,5*nTrk+2) = dFPxydzp;
681 Bjac_mat(2*nTrk+2,0+5*i) = dFPxzdd0(i);
682 Bjac_mat(2*nTrk+2,1+5*i) = dFPxzdz0(i);
683 Bjac_mat(2*nTrk+2,2+5*i) = dFPxzdphi(i);
684 Bjac_mat(2*nTrk+2,3+5*i) = dFPxzdtheta(i);
685 Bjac_mat(2*nTrk+2,4+5*i) = dFPxzdqOverP(i);
686 Bjac_mat(2*nTrk+2,5*nTrk) = dFPxzdxp;
687 Bjac_mat(2*nTrk+2,5*nTrk+1) = dFPxzdyp;
688 Bjac_mat(2*nTrk+2,5*nTrk+2) = dFPxzdzp;
689 } else {
690 Bjac_mat(2*nTrk+0,0+5*i) = dFPxydd0(i);
691 Bjac_mat(2*nTrk+0,1+5*i) = dFPxydz0(i);
692 Bjac_mat(2*nTrk+0,2+5*i) = dFPxydphi(i);
693 Bjac_mat(2*nTrk+0,3+5*i) = dFPxydtheta(i);
694 Bjac_mat(2*nTrk+0,4+5*i) = dFPxydqOverP(i);
695 Bjac_mat(2*nTrk+0,5*nTrk) = dFPxydxp;
696 Bjac_mat(2*nTrk+0,5*nTrk+1) = dFPxydyp;
697 Bjac_mat(2*nTrk+0,5*nTrk+2) = dFPxydzp;
698 Bjac_mat(2*nTrk+1,0+5*i) = dFPxzdd0(i);
699 Bjac_mat(2*nTrk+1,1+5*i) = dFPxzdz0(i);
700 Bjac_mat(2*nTrk+1,2+5*i) = dFPxzdphi(i);
701 Bjac_mat(2*nTrk+1,3+5*i) = dFPxzdtheta(i);
702 Bjac_mat(2*nTrk+1,4+5*i) = dFPxzdqOverP(i);
703 Bjac_mat(2*nTrk+1,5*nTrk) = dFPxzdxp;
704 Bjac_mat(2*nTrk+1,5*nTrk+1) = dFPxzdyp;
705 Bjac_mat(2*nTrk+1,5*nTrk+2) = dFPxzdzp;
706 }
707 }
708
709 Ajac_mat(i,0) = dFxydxs(i);
710 Ajac_mat(i,1) = dFxydys(i);
711 Ajac_mat(i,2) = dFxydzs(i);
712 Ajac_mat(i+nTrk,0) = dFxzdxs(i);
713 Ajac_mat(i+nTrk,1) = dFxzdys(i);
714 Ajac_mat(i+nTrk,2) = dFxzdzs(i);
715 if(massConstraint) {
716 Ajac_mat(2*nTrk,0) = dFMassdxs;
717 Ajac_mat(2*nTrk,1) = dFMassdys;
718 Ajac_mat(2*nTrk,2) = dFMassdzs;
719 }
720 if(pointingConstraint) {
721 if(massConstraint) {
722 Ajac_mat(2*nTrk+1,0) = dFPxydxs;
723 Ajac_mat(2*nTrk+1,1) = dFPxydys;
724 Ajac_mat(2*nTrk+1,2) = dFPxydzs;
725 Ajac_mat(2*nTrk+2,0) = dFPxzdxs;
726 Ajac_mat(2*nTrk+2,1) = dFPxzdys;
727 Ajac_mat(2*nTrk+2,2) = dFPxzdzs;
728 } else {
729 Ajac_mat(2*nTrk+0,0) = dFPxydxs;
730 Ajac_mat(2*nTrk+0,1) = dFPxydys;
731 Ajac_mat(2*nTrk+0,2) = dFPxydzs;
732 Ajac_mat(2*nTrk+1,0) = dFPxzdxs;
733 Ajac_mat(2*nTrk+1,1) = dFPxzdys;
734 Ajac_mat(2*nTrk+1,2) = dFPxzdzs;
735 }
736 }
737 }
738
739 Wb_mat = Wmeas_mat.similarity(Bjac_mat) ;
740 Wb_mat = Wb_mat.inverse();
741
742 C22_mat = Wb_mat.similarity(Ajac_mat.transpose());
743 C22_mat = C22_mat.inverse();
744
745 Btemp_mat = Wb_mat * Bjac_mat * Wmeas_mat;
746 Atemp_mat = Wb_mat * Ajac_mat;
747
748 C21_mat = - C22_mat * Ajac_mat.transpose() * Btemp_mat;
749 C32_mat = Atemp_mat * C22_mat;
750 C31_mat = Btemp_mat + Atemp_mat * C21_mat;
751 Amg::MatrixX mat_prod_1 = Wmeas_mat * Bjac_mat.transpose();
752 Amg::MatrixX mat_prod_2 = Wmeas_mat * Bjac_mat.transpose() * Wb_mat * Ajac_mat;
753 C11_mat = Wmeas_mat - Wb_mat.similarity( mat_prod_1 ) + C22_mat.similarity( mat_prod_2 );
754
755 C_cor_vec = Ajac_mat*DeltaA_vec + Bjac_mat*DeltaY_vec;
756 C_vec = C_cor_vec + F_vec;
757
758 DeltaY_vec = C31_mat.transpose()*C_vec;
759 DeltaA_vec = C32_mat.transpose()*C_vec;
760
761 for (unsigned int i=0; i<n_dim; ++i)
762 {
763 ChiItr_vec(0,i) = DeltaY_vec(i);
764 }
765 ChiItr_mat = Wmeas0_mat.similarity( ChiItr_vec );
766 chi2New = ChiItr_mat(0,0);
767
768 // current vertex position in global coordinates
769 frameOriginItr[0] += DeltaA_vec(0);
770 frameOriginItr[1] += DeltaA_vec(1);
771 frameOriginItr[2] += DeltaA_vec(2);
772 if (msgLvl(MSG::DEBUG)) {
773 msg(MSG::DEBUG) << "New vertex, global coordinates: " << frameOriginItr.transpose() << endmsg;
774 msg(MSG::DEBUG) << "chi2Old: " << chi2Old << " chi2New: " << chi2New << " fabs(chi2Old-chi2New): " << fabs(chi2Old-chi2New) << endmsg;
775 }
776
777 const Amg::Vector3D * globalPositionItr = &frameOriginItr;
778 if (globalPositionItr->perp() > m_maxR && globalPositionItr->z() > m_maxZ) return nullptr;
779
780 if (onConstr && fabs(chi2Old-chi2New) < 0.1) { break; }
781
782 double BFieldItr[3];
783 fieldCache.getField(globalPositionItr->data(),BFieldItr);
784 double B_z_new = BFieldItr[2]*299.792; // should be in GeV/mm
785 if (B_z_new == 0. || std::isnan(B_z_new)) {
786 ATH_MSG_DEBUG("Using old B_z");
787 B_z_new = B_z;
788 }
789
790 restartFit = false;
791 double deltaR = sqrt(DeltaA_vec(0)*DeltaA_vec(0)+DeltaA_vec(1)*DeltaA_vec(1)+DeltaA_vec(2)*DeltaA_vec(2));
792 double deltaB_z = fabs(B_z-B_z_new)/B_z;
793 bool changeBz = false;
794
795 if (m_deltaR) {
796 if (deltaR > 5. && itr < m_maxIterations-1) changeBz = true;
797 } else {
798 if (deltaB_z > 0.000001 && itr < m_maxIterations-1) changeBz = true;
799 }
800
801 if (changeBz) {
802 B_z = B_z_new;
803
804 v0FitterTracks.clear();
805 Trk::PerigeeSurface perigeeSurfaceItr(*globalPositionItr);
806 // Extrapolate the perigees to the new startpoint of the fit
807 for (const Trk::TrackParameters* chargeParameters : originalPerigees)
808 {
809 if (chargeParameters != nullptr)
810 {
811 // Correct material changes
812 const Amg::Vector3D gMomentum = chargeParameters->momentum();
813 const Amg::Vector3D gDirection = chargeParameters->position() - *globalPositionItr;
814 const double extrapolationDirection = gMomentum .dot( gDirection );
815 MaterialUpdateMode mode = Trk::removeNoise;
816 if(extrapolationDirection > 0) mode = Trk::addNoise;
817 std::unique_ptr<const Trk::Perigee> extrapolatedPerigee(nullptr);
818
819 std::unique_ptr<const Trk::TrackParameters> tmp =
820 std::abs(chargeParameters->position().z()) > m_maxZ ? nullptr :
821 m_extrapolator->extrapolate(ctx,
822 *chargeParameters,
823 perigeeSurfaceItr,
824 Trk::anyDirection,
825 true,
826 Trk::pion,
827 mode);
828
829 // if of right type we want to pass ownership
830 if (tmp && tmp->associatedSurface().type() == Trk::SurfaceType::Perigee) {
831 extrapolatedPerigee.reset(
832 static_cast<const Trk::Perigee*>(tmp.release()));
833 }
834
835 if (extrapolatedPerigee == nullptr) {
836 ATH_MSG_DEBUG("Perigee was not extrapolated! Taking original one!");
837 const Trk::Perigee* tmpPerigee = dynamic_cast<const Trk::Perigee*>(chargeParameters);
838 if (tmpPerigee!=nullptr) extrapolatedPerigee = std::make_unique<Trk::Perigee>(*tmpPerigee);
839 else return nullptr;
840 }
841
842 // store track parameters at new starting point
843 V0FitterTrack locV0FitterTrack;
844 locV0FitterTrack.TrkPar[0] = extrapolatedPerigee->parameters()[Trk::d0];
845 locV0FitterTrack.TrkPar[1] = extrapolatedPerigee->parameters()[Trk::z0];
846 locV0FitterTrack.TrkPar[2] = extrapolatedPerigee->parameters()[Trk::phi];
847 locV0FitterTrack.TrkPar[3] = extrapolatedPerigee->parameters()[Trk::theta];
848 locV0FitterTrack.TrkPar[4] = extrapolatedPerigee->parameters()[Trk::qOverP];
849 locV0FitterTrack.Wi_mat = extrapolatedPerigee->covariance()->inverse().eval();
850 locV0FitterTrack.originalPerigee = chargeParameters;
851 v0FitterTracks.push_back(locV0FitterTrack);
852 } else {
853 ATH_MSG_DEBUG("Track parameters are not charged tracks ... fit aborted");
854 return nullptr;
855 }
856 }
857 frameOrigin = frameOriginItr;
858 Y0_vec *= 0.;
859 Y_vec *= 0.;
860 A_vec *= 0.;
861 DeltaY_vec *= 0.;
862 DeltaA_vec *= 0.;
863 chi2Old = 2000000000000.;
864 chi2New = 0.;
865 sumConstr = 0.;
866 onConstr = false;
867 restartFit = true;
868 }
869
870 //if (onConstr && fabs(chi2Old-chi2New) < 0.1) { break; }
871
872 } // end of iteration
873
874 frameOrigin[0] += DeltaA_vec(0);
875 frameOrigin[1] += DeltaA_vec(1);
876 frameOrigin[2] += DeltaA_vec(2);
877 if ( std::isnan(frameOrigin[0]) || std::isnan(frameOrigin[1]) || std::isnan(frameOrigin[2]) ) return nullptr;
878
879 Y_vec = Y0_vec + DeltaY_vec;
880
881 // check theta and phi ranges
882 for (unsigned int i=0; i<nTrk; ++i)
883 {
884 if ( fabs ( Y_vec(2+5*i) ) > 100. || fabs ( Y_vec(3+5*i) ) > 100. ) { return nullptr; }
885 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;
886 while ( Y_vec(3+5*i) > 2*M_PI ) Y_vec(3+5*i) -= 2*M_PI;
887 while ( Y_vec(3+5*i) < -M_PI ) Y_vec(3+5*i) += M_PI;
888 if ( Y_vec(3+5*i) > M_PI )
889 {
890 Y_vec(3+5*i) = 2*M_PI - Y_vec(3+5*i);
891 if ( Y_vec(2+5*i) >= 0 ) Y_vec(2+5*i) += ( Y_vec(2+5*i) >0 ) ? -M_PI : M_PI;
892 }
893 if ( Y_vec(3+5*i) < 0.0 )
894 {
895 Y_vec(3+5*i) = - Y_vec(3+5*i);
896 if ( Y_vec(2+5*i) >= 0 ) Y_vec(2+5*i) += ( Y_vec(2+5*i) >0 ) ? -M_PI : M_PI;
897 }
898 }
899
900 for (unsigned int i=0; i<n_dim; ++i)
901 {
902 Chi_vec(0,i) = DeltaY_vec(i);
903 }
904 Chi_mat = Wmeas0_mat.similarity( Chi_vec );
905 chi2 = Chi_mat(0,0);
906
907 V_mat.setZero();
908 V_mat.block(0,0,n_dim,n_dim) = C11_mat;
909 V_mat.block<3,3>(n_dim,n_dim) = C22_mat;
910 V_mat.block(n_dim,0,3,n_dim) = C21_mat;
911 V_mat.block(0,n_dim,n_dim,3) = C21_mat.transpose();
912
913 // ===> loop over tracks
914 std::vector<V0FitterTrack>::iterator BTIter;
915 int iRP=0;
916 for (BTIter = v0FitterTracks.begin(); BTIter != v0FitterTracks.end() ; ++BTIter)
917 {
918 // chi2 per track
919 AmgSymMatrix(5) covTrk = Wmeas0_mat.block<5,5>(5*iRP,5*iRP);
920 AmgVector(5) chi_vec; chi_vec.setZero();
921 for (unsigned int i=0; i<5; ++i) chi_vec(i) = DeltaY_vec(i+5*iRP);
922 double chi2Trk = chi_vec.dot(covTrk*chi_vec);
923 (*BTIter).chi2=chi2Trk;
924 iRP++;
925 }
926
927 // Store the vertex
928 auto vx = std::make_unique<xAOD::Vertex>();
929 vx->makePrivateStore();
930 vx->setPosition (frameOrigin);
931 vx->setCovariancePosition (C22_mat);
932 vx->setFitQuality(chi2,static_cast<float>(ndf));
933 vx->setVertexType(xAOD::VxType::V0Vtx);
934
935 // Store the tracks at vertex
936 std::vector<VxTrackAtVertex> & tracksAtVertex = vx->vxTrackAtVertex(); tracksAtVertex.clear();
937 Amg::Vector3D Vertex(frameOrigin[0],frameOrigin[1],frameOrigin[2]);
938 const Trk::PerigeeSurface Surface(Vertex);
939 Trk::Perigee * refittedPerigee(nullptr);
940 unsigned int iterf=0;
941 std::vector<V0FitterTrack>::iterator BTIterf;
942 for (BTIterf = v0FitterTracks.begin(); BTIterf != v0FitterTracks.end() ; ++BTIterf)
943 {
944 AmgSymMatrix(5) CovMtxP = V_mat.block<5,5>(5*iterf, 5*iterf);
945 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),
946 Surface, std::move(CovMtxP));
947 tracksAtVertex.emplace_back((*BTIterf).chi2, refittedPerigee, (*BTIterf).originalPerigee);
948 iterf++;
949 }
950
951 // Full Covariance Matrix
952 unsigned int sfcmv = nPar*(nPar+1)/2;
953 std::vector<float> floatErrMtx(sfcmv,0.);
954 unsigned int ipnt = 0;
955 for (unsigned int i=0; i<nPar; ++i) {
956 for (unsigned int j=0; j<i+1; ++j) {
957 floatErrMtx[ipnt++]=V_mat(i,j);
958 }
959 }
960 vx->setCovariance(floatErrMtx);
961
962 return vx;
963 }
964
965
966} //end of namespace definitions
M_PI
#define M_PI
Definition ActiveFraction.h:11
deltaR
Scalar deltaR(const MatrixBase< Derived > &vec) const
Definition AmgMatrixBasePlugin.h:105
endmsg
#define endmsg
Definition AnalysisConfig_Ntuple.cxx:63
ATH_CHECK
#define ATH_CHECK
Evaluate an expression and check for errors.
Definition AthCheckMacros.h:40
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:997
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:589
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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