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TRT_TrajectoryElement_xk.cxx
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1 /*
2  Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
3 */
4 
5 #include "TrkSurfaces/RectangleBounds.h"
6 #include "TrkSurfaces/DiscBounds.h"
7 #include "TRT_TrackExtensionTool_xk/TRT_TrajectoryElement_xk.h"
8 #include "InDetRIO_OnTrack/TRT_DriftCircleOnTrack.h"
9 
11 // Set TRT helper and road width
13 
14 void InDet::TRT_TrajectoryElement_xk::set
15 (const TRT_ID * m,
16  const Trk::IPatternParametersPropagator* pr,
17  const Trk::IPatternParametersUpdator * up,
18  const Trk::IRIO_OnTrackCreator * riod,
19  const Trk::IRIO_OnTrackCreator * rion,
20  double scale)
21 {
22  m_trtid = m ;
23  m_riomakerD = riod ;
24  m_riomakerN = rion ;
25  m_proptool = pr ;
26  m_updatortool = up ;
27  m_scale_error = scale ;
28 }
29 
30 void InDet::TRT_TrajectoryElement_xk::set
31 (const Trk::MagneticFieldProperties & mf, const AtlasFieldCacheCondObj* fieldCondObj)
32 {
33  m_fieldprop = mf;
34  fieldCondObj->getInitializedCache (m_fieldCache);
35 }
36 
38 // Set trajectory element for precision seed
40 
41 bool InDet::TRT_TrajectoryElement_xk::initiateForPrecisionSeed
42 (bool st,const InDetDD::TRT_BaseElement* de,
43  InDet::TRT_DriftCircleCollection::const_iterator& sb,
44  InDet::TRT_DriftCircleCollection::const_iterator& se,
45  std::pair<Amg::Vector3D,double>& gp,
46  const double* dir,double width2)
47 {
48  m_isCluster = st;
49  m_detelement = de;
50 
51  // Test boundary active region of detector elements
52  //
53  if(!boundaryTest(3.,gp)) return false;
54 
55  // Trajectory element links production
56  //
57  initiateLinksForPrecisionSeed(sb,se,gp,dir,width2);
58  return true;
59 }
60 
62 // Set trajectory element for TRT seed
64 
65 bool InDet::TRT_TrajectoryElement_xk::initiateForTRTSeed
66 (bool st,const InDetDD::TRT_BaseElement* de,
67  InDet::TRT_DriftCircleCollection::const_iterator& sb,
68  InDet::TRT_DriftCircleCollection::const_iterator& se,
69  std::pair<Amg::Vector3D,double>& gp,
70  const double* dir,double width2)
71 {
72 
73  m_isCluster = st ;
74  m_detelement = de ;
75 
76  // Test boundary active region of detector elements
77  //
78  bool boundary = boundaryTest(7.,gp);
79 
80  // Trajectory element links production
81  //
82  initiateLinksForTRTSeed(sb,se,gp,dir,width2);
83  return boundary;
84 }
85 
87 // Initiate trajectory element links to straws
89 
90 bool InDet::TRT_TrajectoryElement_xk::boundaryTest
91 (double dw, std::pair<Amg::Vector3D,double>& gp)
92 {
93  if (!m_detelement){
94  return false;
95  }
96 
97  double x = gp.first.x();
98  double y = gp.first.y();
99  double z = gp.first.z();
100 
101  const Amg::Vector3D& C = m_detelement->center();
102 
103  // Test track position
104  //
105  const Trk::SurfaceBounds& surfBounds = m_detelement->bounds();
106  if (surfBounds.type() == Trk::SurfaceBounds::Rectangle) {
107  const Trk::RectangleBounds* rb =
108  static_cast<const Trk::RectangleBounds*>(&surfBounds);
109  // Barrel
110  //
111  m_barrel = true;
112  m_z = z;
113  m_zMin = C.z() - rb->halflengthY();
114  m_zMax = C.z() + rb->halflengthY();
115  double d = std::abs(z - C.z());
116  if (d > rb->halflengthY() + dw) {
117  return false;
118  }
119  } else if (surfBounds.type() == Trk::SurfaceBounds::Disc) {
120  const Trk::DiscBounds* db =
121  static_cast<const Trk::DiscBounds*>(&surfBounds);
122  // Endcap
123  //
124  m_barrel = false;
125  m_radius = std::sqrt(x * x + y * y);
126  m_z = z;
127  m_radiusMin = db->rMin();
128  m_radiusMax = db->rMax();
129 
130  double d = m_radius - m_radiusMin;
131  if (d < -dw) {
132  return false;
133  }
134  d = m_radiusMax - m_radius;
135  if (d < -dw) {
136  return false;
137  }
138  }
139  return true;
140 }
141 
143 // Initiate trajectory element links to straws for precision seed
145 
146 void
147 InDet::TRT_TrajectoryElement_xk::initiateLinksForPrecisionSeed(
148  InDet::TRT_DriftCircleCollection::const_iterator& sb,
149  InDet::TRT_DriftCircleCollection::const_iterator& se,
150  std::pair<Amg::Vector3D, double>& gp,
151  const double* dir,
152  double width2)
153 {
154  m_status = -1;
155  m_bestlink = -1;
156  m_nlinks = 0;
157  double x = gp.first.x();
158  double y = gp.first.y();
159  double z = gp.first.z();
160 
161  const Amg::Transform3D& T = m_detelement->surface().transform();
162 
163  double step = std::abs(dir[0] * T(0, 2) + dir[1] * T(1, 2) + dir[2] * T(2, 2));
164  step > .05 ? step = 1. / step : step = 20.;
165 
166  int Nstraws = m_detelement->nStraws();
167 
168  if (m_detelement->type() == InDetDD::TRT_BaseElement::BARREL) {
169 
170  for (int ns = 0; ns != Nstraws; ++ns) {
171 
172  const Amg::Transform3D& t = m_detelement->strawTransform(ns);
173 
174  double xs = t(0, 3);
175  double ys = t(1, 3);
176  double dx = x - xs;
177  double dy = y - ys;
178  double d = dx * dx + dy * dy;
179  if (d > width2) {
180  continue;
181  }
182 
183  double Az[3] = { t(0, 2), t(1, 2), t(2, 2) };
184  double D = dir[0] * Az[0] + dir[1] * Az[1] + dir[2] * Az[2];
185  double A = (1. - D) * (1. + D);
186  double dz = z - t(2, 3);
187  double S = (dx * (D * Az[0] - dir[0]) + dy * (D * Az[1] - dir[1]) +
188  dz * (D * Az[2] - dir[2])) /
189  A;
190  dx += (dir[0] * S);
191  dy += (dir[1] * S);
192  dz += (dir[2] * S);
193  double Bx = Az[1] * dir[2] - Az[2] * dir[1];
194  double By = Az[2] * dir[0] - Az[0] * dir[2];
195  double Bz = Az[0] * dir[1] - Az[1] * dir[0];
196  double im =
197  (dx * Bx + dy * By + dz * Bz) / std::sqrt(Bx * Bx + By * By + Bz * Bz);
198  double zl = dx * Az[0] + dy * Az[1] + dz * Az[2];
199  S += gp.second;
200  d = std::abs(im);
201  if (y * xs - x * ys > 0.) {
202  d = -d;
203  }
204  m_link[m_nlinks].set(ns, d, im, zl, S);
205  if (++m_nlinks == 24) {
206  break;
207  }
208  }
209  } else {
210 
211  for (int ns = 0; ns != Nstraws; ++ns) {
212 
213  const Amg::Transform3D& t = m_detelement->strawTransform(ns);
214 
215  double xs = t(0, 3);
216  double ys = t(1, 3);
217  double as = m_radius / std::sqrt(xs * xs + ys * ys);
218  double dx = x - xs * as;
219  double dy = y - ys * as;
220  double d = dx * dx + dy * dy;
221  if (d > width2) {
222  continue;
223  }
224 
225  double zs = t(2, 3);
226  double Az[3] = { t(0, 2), t(1, 2), t(2, 2) };
227  double D = dir[0] * Az[0] + dir[1] * Az[1] + dir[2] * Az[2];
228  double A = (1. - D) * (1. + D);
229  dx = x - xs;
230  dy = y - ys;
231  double dz = z - zs;
232  double S = (dx * (D * Az[0] - dir[0]) + dy * (D * Az[1] - dir[1]) +
233  dz * (D * Az[2] - dir[2])) /
234  A;
235  dx += (dir[0] * S);
236  dy += (dir[1] * S);
237  dz += (dir[2] * S);
238  double Bx = Az[1] * dir[2] - Az[2] * dir[1];
239  double By = Az[2] * dir[0] - Az[0] * dir[2];
240  double Bz = Az[0] * dir[1] - Az[1] * dir[0];
241  double im =
242  (dx * Bx + dy * By + dz * Bz) / std::sqrt(Bx * Bx + By * By + Bz * Bz);
243  double zl = dx * Az[0] + dy * Az[1] + dz * Az[2];
244  S += gp.second;
245  d = std::abs(im);
246  if (y * xs - x * ys > 0.) {
247  d = -d;
248  }
249  m_link[m_nlinks].set(ns, d, im, zl, S);
250  if (++m_nlinks == 24) {
251  break;
252  }
253  }
254  }
255  m_dpositive = 1000.;
256  m_dnegative = -1000.;
257  if (m_isCluster && m_nlinks) {
258 
259  bool nl = false;
260  for (; sb != se; ++sb) {
261 
262  int ns = m_trtid->straw((*sb)->identify());
263 
264  for (int l = 0; l != m_nlinks; ++l) {
265  if (ns != m_link[l].number()) {
266  continue;
267  }
268  nl = true;
269  m_link[l].set((*sb));
270 
271  double d = m_link[l].distance();
272  if (d >= 0.) {
273  if (d < m_dpositive)
274  m_dpositive = d;
275  } else {
276  if (d > m_dnegative) {
277  m_dnegative = d;
278  }
279  }
280  break;
281  }
282  }
283  if (!nl) {
284  m_isCluster = false;
285  }
286  }
287 }
288 
290 // Initiate trajectory element links to straws for TRT seed
292 
293 void InDet::TRT_TrajectoryElement_xk::initiateLinksForTRTSeed
294 (InDet::TRT_DriftCircleCollection::const_iterator& sb,
295  InDet::TRT_DriftCircleCollection::const_iterator& se,
296  std::pair<Amg::Vector3D,double>& gp,
297  const double* dir,double width2)
298 {
299  m_status = -1;
300  m_bestlink = -1;
301  m_nlinks = 0;
302  double x = gp.first.x();
303  double y = gp.first.y();
304  double z = gp.first.z();
305 
306  const Amg::Transform3D& T = m_detelement->surface().transform();
307 
308  double step =
309  std::abs(dir[0] * T(0, 2) + dir[1] * T(1, 2) + dir[2] * T(2, 2));
310  step > .05 ? step = 1. / step : step = 20.;
311 
312  int Nstraws = m_detelement->nStraws();
313  if (m_detelement->type() == InDetDD::TRT_BaseElement::BARREL) {
314 
315  for (int ns = 0; ns != Nstraws; ++ns) {
316 
317  const Amg::Transform3D& t = m_detelement->strawTransform(ns);
318 
319  double xs = t(0, 3);
320  double ys = t(1, 3);
321  double dx = x - xs;
322  double dy = y - ys;
323  double d = dx * dx + dy * dy;
324  if (d > width2){
325  continue;
326  }
327 
328  double Az[3] = { t(0, 2), t(1, 2), t(2, 2) };
329  double D = dir[0] * Az[0] + dir[1] * Az[1] + dir[2] * Az[2];
330  double A = (1. - D) * (1. + D);
331  double dz = z - t(2, 3);
332  double S = (dx * (D * Az[0] - dir[0]) + dy * (D * Az[1] - dir[1]) +
333  dz * (D * Az[2] - dir[2])) /
334  A;
335  dx += (dir[0] * S);
336  dy += (dir[1] * S);
337  dz += (dir[2] * S);
338  double Bx = Az[1] * dir[2] - Az[2] * dir[1];
339  double By = Az[2] * dir[0] - Az[0] * dir[2];
340  double Bz = Az[0] * dir[1] - Az[1] * dir[0];
341  double im =
342  (dx * Bx + dy * By + dz * Bz) / std::sqrt(Bx * Bx + By * By + Bz * Bz);
343  double zl = dx * Az[0] + dy * Az[1] + dz * Az[2];
344  S += gp.second;
345  d = std::abs(im);
346  if (y * xs - x * ys > 0.){
347  d = -d;
348  }
349  m_link[m_nlinks].set(ns, d, im, zl, S);
350  if (++m_nlinks == 24){
351  break;
352  }
353  }
354  } else {
355 
356  double ri = 1. / m_radius;
357  double ax = x * ri;
358  double ay = y * ri;
359 
360  for (int ns = 0; ns != Nstraws; ++ns) {
361 
362  const Amg::Transform3D& t = m_detelement->strawTransform(ns);
363 
364  double xs = t(0, 3);
365  double ys = t(1, 3);
366  double as = m_radius / std::sqrt(xs * xs + ys * ys);
367  double dx = x - xs * as;
368  double dy = y - ys * as;
369  double d = dx * dx + dy * dy;
370  if (d > width2){
371  continue;
372  }
373 
374  double zs = t(2, 3);
375  double Az[3] = { t(0, 2), t(1, 2), t(2, 2) };
376  double D = dir[0] * Az[0] + dir[1] * Az[1] + dir[2] * Az[2];
377  double A = 1. / ((1. - D) * (1. + D));
378  dx = x - xs;
379  dy = y - ys;
380  double dz = z - zs;
381  double Dx = (D * Az[0] - dir[0]);
382  double Dy = (D * Az[1] - dir[1]);
383  double S = (dx * Dx + dy * Dy + dz * (D * Az[2] - dir[2])) * A;
384  dx += (dir[0] * S);
385  dy += (dir[1] * S);
386  dz += (dir[2] * S);
387  double Bx = Az[1] * dir[2] - Az[2] * dir[1];
388  double By = Az[2] * dir[0] - Az[0] * dir[2];
389  double Bz = Az[0] * dir[1] - Az[1] * dir[0];
390  double B = 1. / std::sqrt(Bx * Bx + By * By + Bz * Bz);
391  double im = (dx * Bx + dy * By + dz * Bz) * B;
392  double zl = dx * Az[0] + dy * Az[1] + dz * Az[2];
393 
394  // d(im)/dr calculation for endcap
395  //
396  double dS = (ax * Dx + ay * Dy) * A;
397  double sx = ax + dir[0] * dS;
398  double sy = ay + dir[1] * dS;
399  double sd = (sx * Bx + sy * By) * B;
400  double sz = sx * Az[0] + sy * Az[1];
401  S += gp.second;
402  if (y * xs - x * ys > 0.) {
403  d = -std::abs(im);
404  sd = -std::abs(im + sd) - d;
405  } else {
406  d = std::abs(im);
407  sd = std::abs(im + sd) - d;
408  }
409 
410  m_link[m_nlinks].set(ns, d, im, zl, S, sd, sz);
411  if (++m_nlinks == 24){
412  break;
413  }
414  }
415  }
416 
417  m_dpositive = 1000.;
418  m_dnegative = -1000.;
419  if (m_isCluster && m_nlinks) {
420 
421  bool nl = false;
422  for (; sb != se; ++sb) {
423 
424  int ns = m_trtid->straw((*sb)->identify());
425 
426  for (int l = 0; l != m_nlinks; ++l) {
427  if (ns != m_link[l].number())
428  continue;
429  nl = true;
430  m_link[l].set((*sb));
431 
432  double d = m_link[l].distance();
433  if (d >= 0.) {
434  if (d < m_dpositive){
435  m_dpositive = d;
436  }
437  } else {
438  if (d > m_dnegative){
439  m_dnegative = d;
440  }
441  }
442  break;
443  }
444  }
445  if (!nl){
446  m_isCluster = false;
447  }
448  }
449 }
450 
452 // Build trajectory element without propagation for precision seed
454 
455 bool InDet::TRT_TrajectoryElement_xk::buildForPrecisionSeed
456 (double a,double b,bool& useDriftTime, bool& hole)
457 {
458 
459  m_bestlink = -1;
460  m_status = -1;
461  hole = false; if(!m_nlinks) return false;
462 
463  for(int l=0; l!=m_nlinks; ++l) {
464 
465  double v = (a*m_link[l].way()+b)*m_link[l].way();
466  double d = m_link[l].distance()-v;
467  double ad = std::abs(d);
468 
469  if(ad > 2.05) continue;
470 
471  if(!m_link[l].cluster()) {
472 
473  if(ad < 1.85) {
474  m_status = 0; hole=true; m_bestlink=l; m_link[l].newImpactParameter(d);
475  }
476  return false;
477  }
478 
479  m_status = 1; m_bestlink=l; m_link[l].newImpactParameter(d);
480  if(!useDriftTime) return true;
481 
482  double r = m_link[l].cluster()->localPosition()[Trk::driftRadius];
483  double e = m_scale_error*std::sqrt(m_link[l].cluster()->localCovariance()(0,0));
484 
485  if(r > 2.05) r = 2.05;
486  double r2 = r+e; if(r2 > 2.05) r2 = 2.05;
487  double r1 = r-e; if(r1 >= r2) r1 = r2-2.*e;
488 
489  if(ad < r1 || ad > r2) useDriftTime = false; else m_status = 2;
490 
491  return true;
492  }
493  return false;
494 }
495 
497 // Build trajectory element without propagation for TRT seed
498 // without radius correction
500 
501 bool InDet::TRT_TrajectoryElement_xk::buildForTRTSeed
502 (double a,double b,bool& useDriftTime, bool& hole)
503 {
504 
505  m_status = -1;
506  hole = false; if( m_bestlink < 0) return false;
507  int l = m_bestlink;
508 
509  double v = (a*m_link[l].way()+b)*m_link[l].way();
510  double d = m_link[l].distance()-v;
511  double ad = std::abs(d);
512 
513  if(ad > 2.05) return false;
514 
515  if(!m_link[l].cluster()) {
516 
517  if(ad < 1.85) {
518  m_status = 0; hole=true; m_bestlink=l; m_link[l].newImpactParameter(d);
519  }
520  return false;
521  }
522  m_status = 1; m_link[l].newImpactParameter(d);
523  if(!useDriftTime) return true;
524 
525  double r = m_link[l].cluster()->localPosition()[Trk::driftRadius];
526  double e = m_scale_error*std::sqrt(m_link[l].cluster()->localCovariance()(0,0));
527 
528  if(r > 2.05) r = 2.05;
529  double r2 = r+e; if(r2 > 2.05) r2 = 2.05;
530  double r1 = r-e; if(r1 >= r2) r1 = r2-2.*e;
531  if(ad < r1 || ad > r2) useDriftTime = false; else m_status = 2;
532  return true;
533 }
534 
536 // Find close linek
538 
539 double InDet::TRT_TrajectoryElement_xk::findCloseLink
540 (double a,double b)
541 {
542  m_bestlink = -1;
543  double dm = 10000.;
544 
545  for(int l=0; l < m_nlinks; ++l) {
546 
547  double v = (a*m_link[l].way()+b)*m_link[l].way();
548  double d = std::abs(m_link[l].distance()-v);
549 
550  if(d < dm) {dm=d; m_bestlink=l;}
551  }
552  return dm;
553 }
554 
556 // Build RIOnTrack
558 
559 const Trk::RIO_OnTrack* InDet::TRT_TrajectoryElement_xk::rioOnTrack()
560 {
561  if(m_bestlink < 0 || m_status<=0) return nullptr;
562 
563  int l = m_bestlink;
564 
565  const Trk::StraightLineSurface* line = (const Trk::StraightLineSurface*)
566  (&(m_link[l].cluster()->detectorElement())->surface(m_link[l].cluster()->identify()));
567  Trk::AtaStraightLine Tp(m_link[l].impact(),m_link[l].zlocal(),1.,1.,1.,*line);
568  if(m_status==2)
569  return m_riomakerD->correct(*m_link[l].cluster(),Tp);
570  else
571  return m_riomakerN->correct(*m_link[l].cluster(),Tp);
572 }
573 
575 // Build simple RIOnTrack
577 
578 std::unique_ptr<Trk::RIO_OnTrack>
579 InDet::TRT_TrajectoryElement_xk::rioOnTrackSimple() const
580 {
581  if(m_bestlink < 0 || m_status<=0) return nullptr;
582 
583  int l = m_bestlink;
584  Amg::Vector3D dir(1.,0.,0.);
585  Trk::DefinedParameter radius(0.,Trk::locX);
586  Amg::MatrixX cov(1,1);
587  cov(0,0) = 1.;
588  if(m_status==2) {
589  return std::make_unique<InDet::TRT_DriftCircleOnTrack>(m_link[l].cluster(),Trk::LocalParameters(radius),
590  std::move(cov),0,0.,dir,Trk::DECIDED);
591  }
592  return std::make_unique<InDet::TRT_DriftCircleOnTrack>(m_link[l].cluster(),Trk::LocalParameters(radius),
593  std::move(cov),0,0.,dir,Trk::NODRIFTTIME);
594 }
595 
597 // Propagate track parameters to closest drift circles
599 
600 bool InDet::TRT_TrajectoryElement_xk::propagate
601 (Trk::PatternTrackParameters& Ta,Trk::PatternTrackParameters& Tb)
602 {
603  if(m_bestlink<0) return false;
604 
605  return m_proptool->propagate
606  (Gaudi::Hive::currentContext(),
607  Ta,m_link[m_bestlink].surface(),Tb,Trk::anyDirection,m_fieldprop,Trk::pion);
608 }
609 
611 // Add drift circles information to track parameters
613 
614 bool InDet::TRT_TrajectoryElement_xk::addCluster
615 (Trk::PatternTrackParameters& Ta,Trk::PatternTrackParameters& Tb,double& Xi2)
616 {
617 
618  if(m_status <=0) return false;
619 
620  int n;
621  if(m_status==2) {
622 
623  const TRT_DriftCircle* DS = m_link[m_bestlink].cluster();
624  double dr = DS->localPosition().x(); if(m_link[m_bestlink].impact() < 0.) dr=-dr;
625 
626  Trk::DefinedParameter radius(dr,Trk::locX);
627  Trk::LocalParameters lp(radius);
628 
629  Trk::PatternTrackParameters To = Ta;
630  bool Q = m_updatortool->addToState(Ta,lp,DS->localCovariance(),Tb,Xi2,n);
631  if(Q && Xi2 < 15.) return Q;
632  m_status = 1; Ta = To;
633  }
634 
635  Trk::DefinedParameter radius(0.,Trk::locX);
636  Trk::LocalParameters lp(radius);
637 
638  AmgSymMatrix(1) cov; cov<<1.33333;
639  return m_updatortool->addToState(Ta,lp,cov,Tb,Xi2,n);
640 }
641 
643 // Global trajectory coordinates calculation
645 
646 bool InDet::TRT_TrajectoryElement_xk::trajectoryGlobalPosition
647 (Amg::Vector3D& G,double& WAY)
648 {
649  int l = m_bestlink;
650  if( l<0 ) return false;
651 
652  const Amg::Transform3D& t = m_detelement->strawTransform(m_link[l].number());
653 
654  double Az[3] = {t(0,2),t(1,2),t(2,2)};
655  double Rc[3] = {t(0,3),t(1,3),t(2,3)};
656 
657  double Bx,By;
658 
659  if(std::abs(Az[2]) > .7) { // Barrel
660 
661  double Ri = 1./std::sqrt(Rc[0]*Rc[0]+Rc[1]*Rc[1]);
662  Bx =-Az[2]*Rc[1]*Ri; By = Az[2]*Rc[0]*Ri;
663  }
664  else if(Rc[2] > 0. ) { // Positive endcap
665 
666  Bx = Az[1]; By =-Az[0];
667  }
668  else { // Negative endcap
669 
670  Bx =-Az[1]; By = Az[0];
671  }
672  double zl = m_link[l].zlocal();
673  double im = m_link[l].impact();
674  G[0] = zl*Az[0]+Bx*im+Rc[0];
675  G[1] = zl*Az[1]+By*im+Rc[1];
676  G[2] = zl*Az[2] +Rc[2];
677  WAY = m_link[l].way() ;
678  return true;
679 }
680 
682 // Track parameters estimation on detector element
684 
685 bool InDet::TRT_TrajectoryElement_xk::trackParametersEstimation
686 (TRT_TrajectoryElement_xk* E1,TRT_TrajectoryElement_xk* E2,Trk::PatternTrackParameters& Tp,
687  double ZvHW)
688 {
689 
690  if(!E1) return false;
691 
692  Amg::Vector3D Gp[3];
693  double Wa[3];
694 
695  if (! trajectoryGlobalPosition(Gp[0],Wa[0])) return false;
696  if (!E1->trajectoryGlobalPosition(Gp[1],Wa[1])) return false;
697 
698  int mode; Wa[0] > Wa[1] ? mode=0 : mode=1;
699 
700  if(E2) {
701  if(!E2->trajectoryGlobalPosition(Gp[2],Wa[2])) return false;
702  }
703  else {
704  double dx = Gp[1][0]-Gp[0][0];
705  double dy = Gp[1][1]-Gp[0][1];
706  Gp[2][0] = 0.;
707  Gp[2][1] = 0.;
708  Gp[2][2] = Gp[0][2]-(Gp[1][2]-Gp[0][2])*std::sqrt((Gp[0][0]*Gp[0][0]+Gp[0][1]*Gp[0][1])/(dx*dx+dy*dy));
709  Wa[2] = 0.;
710  mode = 2 ;
711  }
712 
713  double x0 = Gp[0][0] ;
714  double y0 = Gp[0][1] ;
715  double x1 = Gp[1][0]-x0 ;
716  double y1 = Gp[1][1]-y0 ;
717  double x2 = Gp[2][0]-x0 ;
718  double y2 = Gp[2][1]-y0 ;
719  double r1 = std::sqrt(x1*x1+y1*y1) ;
720  double u1 = 1./r1 ;
721  double r2 = 1./(x2*x2+y2*y2) ;
722  double a = x1*u1 ;
723  double b = y1*u1 ;
724  double u2 = (a*x2+b*y2)*r2 ;
725  double v2 = (a*y2-b*x2)*r2 ;
726  double A = v2/(u2-u1) ;
727  double B = 2.*(v2-A*u2) ;
728  double C = B/std::sqrt(1.+A*A) ;
729 
730  double f,TP[3];
731 
732  if(mode==0) {
733  f = atan2(-b-a*A,-a+b*A); C=-C; polarAngleEstimation(E2,Gp[0],Gp[2],C,ZvHW,TP);
734  }
735  else if(mode==1) {
736  f = atan2( b+a*A, a-b*A); polarAngleEstimation(E2,Gp[0],Gp[2],C,ZvHW,TP);
737  }
738  else {
739  f = atan2( b+a*A, a-b*A); polarAngleEstimation(E1,Gp[0],Gp[1],C,ZvHW,TP);
740  }
741 
742  // Track parameters estimation
743  //
744  double P[5] = {m_link[m_bestlink].impact(),m_link[m_bestlink].zlocal(),f,atan2(1.,TP[0]),.0001};
745 
746  double pos0[3]; pos0[0]=Gp[0][0]; pos0[1]=Gp[0][1]; pos0[2]=Gp[0][2];
747  double pos1[3]; pos1[0]=Gp[1][0]; pos1[1]=Gp[1][1]; pos1[2]=Gp[1][2];
748  double pos2[3]; pos2[0]=Gp[2][0]; pos2[1]=Gp[2][1]; pos2[2]=Gp[2][2];
749  double H0 [3];
750  double H1 [3];
751  double H2 [3];
752  m_fieldCache.getFieldZR (pos0,H0);
753  m_fieldCache.getFieldZR (pos1,H1);
754  m_fieldCache.getFieldZR (pos2,H2);
755 
756  double Hz = .333333*(H0[2]+H1[2]+H2[2]);
757 
758  // If magnetic field exist
759  //
760  double Cm = 1. ;
761  double T2 = TP[0]*TP[0];
762  if(std::abs(Hz)>1.e-9) {Cm = 1./(300.*Hz*std::sqrt(1.+T2)); P[4] = -C*Cm;}
763 
764  // Covariance of track parameters estimation
765  //
766  double wa; mode != 2 ? wa = 1./(Wa[0]-Wa[2]) : wa = 1./Wa[1];
767  const double dS = 4. ;
768 
769  double df = dS*wa ;
770  double dp = 8.*df*wa*Cm ;
771  double c0 = 4. ;
772  double c1 = TP[1] ;
773  double c2 = df*df*(1.+T2);
774  double c3 = TP[2] ;
775  double c4 = dp*dp ;
776  double V[15] ={c0,
777  0.,c1,
778  0.,0.,c2,
779  0.,0.,0.,c3,
780  0.,0.,0.,0.,c4};
781 
782  Tp.setParametersWithCovariance(&m_link[m_bestlink].surface(),P,V);
783  return true;
784 }
785 
787 // Track parameters estimation for perigee
789 
790 bool InDet::TRT_TrajectoryElement_xk::trackParametersEstimation
791 (TRT_TrajectoryElement_xk* E1,Trk::PatternTrackParameters& Tp,double ZvHW)
792 {
793 
794  if(!E1) return false;
795 
796  Amg::Vector3D Gp[3];
797  double Wa[3];
798  if (! trajectoryGlobalPosition(Gp[1],Wa[1])) return false;
799  if (!E1->trajectoryGlobalPosition(Gp[2],Wa[2])) return false;
800 
801  double dx = Gp[2][0]-Gp[1][0];
802  double dy = Gp[2][1]-Gp[1][1];
803  Gp[0][0] = 0.;
804  Gp[0][1] = 0.;
805  Gp[0][2] = Gp[1][2]-(Gp[2][2]-Gp[1][2])*std::sqrt((Gp[1][0]*Gp[1][0]+Gp[1][1]*Gp[1][1])/(dx*dx+dy*dy));
806  Wa[0] = 0.;
807 
808  double x0 = Gp[0][0] ;
809  double y0 = Gp[0][1] ;
810  double x1 = Gp[1][0]-x0 ;
811  double y1 = Gp[1][1]-y0 ;
812  double x2 = Gp[2][0]-x0 ;
813  double y2 = Gp[2][1]-y0 ;
814  double r1 = std::sqrt(x1*x1+y1*y1) ;
815  double u1 = 1./r1 ;
816  double r2 = 1./(x2*x2+y2*y2) ;
817  double a = x1*u1 ;
818  double b = y1*u1 ;
819  double u2 = (a*x2+b*y2)*r2 ;
820  double v2 = (a*y2-b*x2)*r2 ;
821  double A = v2/(u2-u1) ;
822  double B = 2.*(v2-A*u2) ;
823  double C = B/std::sqrt(1.+A*A) ;
824 
825  double f,TP[3];
826 
827  f = atan2( b+a*A, a-b*A); polarAngleEstimation(E1,Gp[1],Gp[2],C,ZvHW,TP);
828 
829  // Track parameters estimation
830  //
831  double P[5] = {0.,Gp[0][2],f,atan2(1.,TP[0]),.0001};
832 
833  double pos0[3]; pos0[0]=Gp[0][0]; pos0[1]=Gp[0][1]; pos0[2]=Gp[0][2];
834  double pos1[3]; pos1[0]=Gp[1][0]; pos1[1]=Gp[1][1]; pos1[2]=Gp[1][2];
835  double pos2[3]; pos2[0]=Gp[2][0]; pos2[1]=Gp[2][1]; pos2[2]=Gp[2][2];
836  double H0 [3];
837  double H1 [3];
838  double H2 [3];
839  m_fieldCache.getFieldZR (pos0,H0);
840  m_fieldCache.getFieldZR (pos1,H1);
841  m_fieldCache.getFieldZR (pos2,H2);
842 
843  double Hz = .333333*(H0[2]+H1[2]+H2[2]);
844 
845  // If magnetic field exist
846  //
847  double Cm = 1.;
848  double T2 = TP[0]*TP[0];
849  if(std::abs(Hz)>1.e-9) {Cm = 1./(300.*Hz*std::sqrt(1.+T2)); P[4] = -C*Cm;}
850 
851  // Covariance of track parameters estimation
852  //
853  double wa = 1./Wa[2];
854 
855  const double dS = 4. ;
856  double df = dS*wa ;
857  double dp = 8.*df*wa*Cm ;
858  double c0 = .1 ;
859  double c1 = ZvHW*ZvHW*.1 ;
860  double c2 = df*df*(1.+T2);
861  double c3 = TP[2] ;
862  double c4 = dp*dp ;
863  double V[15] ={c0,
864  0.,c1,
865  0.,0.,c2,
866  0.,0.,0.,c3,
867  0.,0.,0.,0.,c4};
868 
869  Tp.setParametersWithCovariance(nullptr,P,V);
870  return true;
871 }
872 
874 // Polar angle estimation
875 //
876 // Tp[0] = dz/dr=1./tan(Theta)
877 // Tp[1] = cov(Z loc)
878 // Tp[2] = cov(Theta)
880 
881 void InDet::TRT_TrajectoryElement_xk::polarAngleEstimation
882 (TRT_TrajectoryElement_xk* E,Amg::Vector3D& G0,Amg::Vector3D& G1,double C,double VZ,double* Tp) const
883 {
884  double dx = G1[0]-G0[0] ;
885  double dy = G1[1]-G0[1] ;
886  double dz = G1[2]-G0[2] ;
887  double dr = std::sqrt(dx*dx+dy*dy) ;
888  double rc = dr*C ;
889  Tp[0] = dz/(dr*(1.+.04*rc*rc));
890 
891  double r0 = G0[0]*G0[0]+G0[1]*G0[1];
892  double r1 = G1[0]*G1[0]+G1[1]*G1[1];
893 
894  if( r0 > r1) {
895 
896  Tp[0] =-Tp[0];
897  if ( m_barrel ) { //---------------------------->BB
898 
899  double dZ = m_zMax-m_zMin ;
900  double dT = (dZ+2.*VZ) ;
901  Tp[1] = dZ*dZ*.1 ;
902  Tp[2] = dT*dT*.1/r0 ;
903  }
904  else if(E->m_barrel) { //---------------------------->EB
905 
906  double T2 = Tp[0]*Tp[0] ;
907  Tp[1] = 400. ;
908  Tp[2] = (VZ*VZ)/((1.+T2)*r0) ;
909  }
910  else { //---------------------------->EE
911 
912  double T2 = Tp[0]*Tp[0] ;
913  Tp[1] = 400. ;
914  Tp[2] = (VZ*VZ)/((1.+T2)*r0) ;
915  }
916  }
917  else {
918  if (E->m_barrel) { //---------------------------->BB
919 
920  double dZ = m_zMax-m_zMin ;
921  double dT = (E->m_zMax-E->m_zMin+2.*VZ);
922  Tp[1] = dZ*dZ*.1 ;
923  Tp[2] = dT*dT*.1/r1 ;
924  }
925  else if( m_barrel ) { //---------------------------->BE
926 
927  double T2 = Tp[0]*Tp[0] ;
928  double dr = std::sqrt(r1)-std::sqrt(r0) ;
929  Tp[1] = dr*dr*VZ*VZ/r1 ;
930  Tp[2] = (VZ*VZ)/((1.+T2)*r1) ;
931 
932  }
933  else { //---------------------------->EE
934 
935  double T2 = Tp[0]*Tp[0] ;
936  Tp[1] = 400. ;
937  Tp[2] = (VZ*VZ)/((1.+T2)*r1) ;
938  }
939  }
940 }
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