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Resonance Class Reference

class for resonances as internal particles More...

#include <Resonance.h>

Inheritance diagram for Resonance:
InternalParticle ParticleBase

Public Types

enum  TFParticleType {
  kInteractionPoint ,
  kOrigin ,
  kComposite ,
  kRecoResonance ,
  kInternalParticle ,
  kRecoTrack ,
  kResonance ,
  kRecoNeutral ,
  kMissingParticle
}
 particle types More...
 
typedef std::vector< Constraint > constraintlist
 alias
 
typedef std::vector< std::pair< const ParticleBase *, int > > indexmap
 alias
 

Public Member Functions

 Resonance (Belle2::Particle *particle, const ParticleBase *mother, const ConstraintConfiguration &config, bool forceFitAll)
 constructor
 
virtual ~Resonance ()
 destructor
 
ErrCode initMotherlessParticle (FitParams &fitparams) override
 initialise a motherless particle
 
ErrCode initParticleWithMother (FitParams &fitparams) override
 initialise a particle with a mother
 
virtual int dim () const override
 dimension (4)
 
virtual int type () const override
 particle type
 
virtual std::string parname (int index) const override
 parameter name
 
virtual int posIndex () const override
 get position index in statevector x,y,z,tau,px,py,pz
 
virtual int momIndex () const override
 get momentum index in statevector
 
virtual int tauIndex () const override
 get tau (lifetime) index in statevector
 
virtual bool hasPosition () const override
 does this class have position?
 
virtual ErrCode initCovariance (FitParams &) const override
 init covariance
 
ErrCode projectKineConstraint (const FitParams &, Projection &) const
 project kinematical constraint
 
ErrCode projectBeamConstraint (const FitParams &, Projection &) const
 project beam four momentum constraint
 
virtual void forceP4Sum (FitParams &) const override
 enforce conservation of momentum sum
 
ErrCode projectConstraint (const Constraint::Type type, const FitParams &fitparams, Projection &p) const override
 find out which constraint it is and project
 
virtual bool hasEnergy () const override
 has energy in fitparams
 
virtual void addToConstraintList (constraintlist &list, int depth) const override
 add to constraint list
 
void setMassConstraint (bool b)
 set mass constraint flag
 
virtual void updateIndex (int &offset)
 this sets the index for momentum, position, etc.
 
const ParticleBase * locate (Belle2::Particle *particle) const
 get particle base from basf2 particle
 
Belle2::Particle * particle () const
 get basf2 particle
 
int index () const
 get index
 
const ParticleBase * mother () const
 getMother() / hasMother()
 
virtual ErrCode projectGeoConstraint (const FitParams &, Projection &) const
 project geometrical constraint
 
virtual ErrCode projectMassConstraintParticle (const FitParams &, Projection &) const
 project mass constraint using the particles parameters
 
virtual ErrCode projectMassConstraintDaughters (const FitParams &, Projection &) const
 project mass constraint using the parameters of the daughters
 
virtual ErrCode projectMassConstraint (const FitParams &, Projection &) const
 project mass constraint abstract
 
int eneIndex () const
 get energy index
 
virtual double chiSquare (const FitParams &) const
 get chi2
 
int charge () const
 get charge
 
virtual ParticleBase * addDaughter (Belle2::Particle *, const ConstraintConfiguration &config, bool forceFitAll=false)
 add daughter
 
virtual void removeDaughter (const ParticleBase *pb)
 remove daughter
 
virtual void retrieveIndexMap (indexmap &anindexmap) const
 get index map
 
void setMother (const ParticleBase *m)
 set mother
 
void collectVertexDaughters (std::vector< ParticleBase * > &particles, int posindex)
 get vertex daughters
 
virtual int nFinalChargedCandidates () const
 number of charged candidates
 

Static Public Member Functions

static ParticleBase * createParticle (Belle2::Particle *particle, const ParticleBase *mother, const ConstraintConfiguration &config, bool forceFitAll=false)
 create the according treeFitter particle obj for a basf2 particle type
 
static ParticleBase * createOrigin (Belle2::Particle *daughter, const ConstraintConfiguration &config, bool forceFitAll)
 create a custom origin particle or a beamspot
 

Protected Types

typedef std::vector< ParticleBase * > ParticleContainer
 just an alias
 

Protected Member Functions

ErrCode initMomentum (FitParams &fitparams) const
 init momentum of *this and daughters
 
ErrCode initTau (FitParams &par) const
 initialises tau as a length
 
void setIndex (int i)
 set Index (in statevector)
 

Static Protected Member Functions

static bool isAResonance (Belle2::Particle *particle)
 controls if a particle is treated as a resonance(lifetime=0) or a particle that has a finite lifetime.
 

Protected Attributes

Belle2::Particle * m_particle
 pointer to framework type
 
const ParticleBase * m_mother
 motherparticle
 
std::vector< ParticleBase * > m_daughters
 daughter container
 
bool m_isStronglyDecayingResonance
 decay length less than 1 micron
 
const ConstraintConfiguration * m_config
 has all the constraint config
 

Static Private Member Functions

static bool compTrkTransverseMomentum (const RecoTrack *lhs, const RecoTrack *rhs)
 compare transverse track momentum
 

Private Attributes

bool m_massconstraint
 has mass constraint
 
bool m_beamconstraint
 has beam constraint
 
bool m_shares_vertex_with_mother
 shares vertex with mother, that means decay vertex = productionvertex
 
bool m_geo_constraint
 use a geo metric constraint
 
bool m_lifetimeconstraint
 has lifetime constraint
 
bool m_isconversion
 is conversion
 
bool m_automatic_vertex_constraining
 automatically figure out if mother and particle vertex should be the same and also add geometric constraints
 
int m_index
 index
 
std::string m_name
 name
 

Detailed Description

class for resonances as internal particles

Definition at line 18 of file Resonance.h.

Member Typedef Documentation

◆ constraintlist

typedef std::vector<Constraint> constraintlist
inherited

alias

Definition at line 48 of file ParticleBase.h.

◆ indexmap

typedef std::vector< std::pair<const ParticleBase*, int> > indexmap
inherited

alias

Definition at line 51 of file ParticleBase.h.

◆ ParticleContainer

typedef std::vector<ParticleBase*> ParticleContainer
protectedinherited

just an alias

Definition at line 174 of file ParticleBase.h.

Member Enumeration Documentation

◆ TFParticleType

enum TFParticleType
inherited

particle types

Definition at line 27 of file ParticleBase.h.

27 {kInteractionPoint,
28 kOrigin,
29 kComposite,
30 kRecoResonance,
31 kInternalParticle,
32 kRecoTrack,
33 kResonance,
34 kRecoNeutral,
35 kMissingParticle
36 };

Constructor & Destructor Documentation

◆ Resonance()

Resonance ( Belle2::Particle * particle,
const ParticleBase * mother,
const ConstraintConfiguration & config,
bool forceFitAll )

constructor

Definition at line 14 of file Resonance.cc.

17 :
18 InternalParticle(particle, mother, config, forceFitAll) {}

Member Function Documentation

◆ addDaughter()

ParticleBase * addDaughter ( Belle2::Particle * cand,
const ConstraintConfiguration & config,
bool forceFitAll = false )
virtualinherited

add daughter

Definition at line 63 of file ParticleBase.cc.

64 {
65 auto newDaughter = ParticleBase::createParticle(cand, this, config, forceFitAll);
66 m_daughters.push_back(newDaughter);
67 return m_daughters.back();
68 }

◆ addToConstraintList()

void addToConstraintList ( constraintlist & list,
int depth ) const
overridevirtualinherited

add to constraint list

Implements ParticleBase.

Definition at line 381 of file InternalParticle.cc.

383 {
384
385 for (auto daughter : m_daughters) {
386 daughter->addToConstraintList(list, depth - 1);
387 }
388 if (tauIndex() >= 0 && m_lifetimeconstraint) {
389 list.push_back(Constraint(this, Constraint::lifetime, depth, 1));
390 }
391 if (momIndex() >= 0) {
392 list.push_back(Constraint(this, Constraint::kinematic, depth, 4, 3));
393 }
394 if (m_geo_constraint) {
395 assert(m_config);
396 const int dim = m_config->m_originDimension == 2 && std::abs(m_particle->getPDGCode()) == m_config->m_headOfTreePDG ? 2 : 3;
397 list.push_back(Constraint(this, Constraint::geometric, depth, dim, 3));
398 }
399 if (m_massconstraint) {
400 list.push_back(Constraint(this, Constraint::mass, depth, 1, 3));
401 }
402 if (m_beamconstraint) {
403 assert(m_config);
404 list.push_back(Constraint(this, Constraint::beam, depth, 4, 3));
405 }
406
407 }

◆ charge()

int charge ( ) const
inlineinherited

get charge

Definition at line 140 of file ParticleBase.h.

141 {
142 if (m_particle->getPDGCode()) {
143 double fltcharge = m_particle->getCharge();
144 return fltcharge < 0 ? int(fltcharge - 0.5) : int(fltcharge + 0.5);
145 } else {
146 return m_particle->getCharge() > 0 ? 1 : (m_particle->getCharge() < 0 ? -1 : 0);
147 }
148 }

◆ chiSquare()

double chiSquare ( const FitParams & fitparams) const
virtualinherited

get chi2

Definition at line 229 of file ParticleBase.cc.

230 {
231 double rc = 0;
232 for (auto* daughter : m_daughters) {
233 rc += daughter->chiSquare(fitparams);
234 }
235 return rc;
236 }

◆ collectVertexDaughters()

void collectVertexDaughters ( std::vector< ParticleBase * > & particles,
int posindex )
inherited

get vertex daughters

Definition at line 154 of file ParticleBase.cc.

155 {
156 if (mother() && mother()->posIndex() == posindex) {
157 particles.push_back(this);
158 }
159
160 for (auto* daughter : m_daughters) {
161 daughter->collectVertexDaughters(particles, posindex);
162 }
163 }

◆ compTrkTransverseMomentum()

bool compTrkTransverseMomentum ( const RecoTrack * lhs,
const RecoTrack * rhs )
staticprivateinherited

compare transverse track momentum

Definition at line 86 of file InternalParticle.cc.

87 {
88
89 return lhs->particle()->getMomentum().Rho() > rhs->particle()->getMomentum().Rho();
90 }

◆ createOrigin()

ParticleBase * createOrigin ( Belle2::Particle * daughter,
const ConstraintConfiguration & config,
bool forceFitAll )
staticinherited

create a custom origin particle or a beamspot

Definition at line 91 of file ParticleBase.cc.

96 {
97 return new Origin(daughter, config, forceFitAll);
98 }

◆ createParticle()

ParticleBase * createParticle ( Belle2::Particle * particle,
const ParticleBase * mother,
const ConstraintConfiguration & config,
bool forceFitAll = false )
staticinherited

create the according treeFitter particle obj for a basf2 particle type

Definition at line 100 of file ParticleBase.cc.

102 {
103 ParticleBase* rc = nullptr;
104
105 if (!mother) { // If there is no mother, this is the 'head of tree' particle (is never a resonance)
106 rc = new InternalParticle(particle, nullptr, config, forceFitAll);
107 } else if (particle->hasExtraInfo("bremsCorrected") // Has Bremsstrahlungs-recovery
108 && particle->getExtraInfo("bremsCorrected") != 0) { // and gammas are attached
109 rc = new Composite(particle, mother, config, true);
110 // if no gamma is attached, it is treated as a RecoTrack
111 } else if (particle->hasExtraInfo("treeFitterTreatMeAsInvisible")
112 && particle->getExtraInfo("treeFitterTreatMeAsInvisible") == 1) { // dummy particles with invisible flag
113 rc = new RecoResonance(particle, mother, config);
114 } else if (particle->getTrack()) { // external reconstructed track
115 rc = new RecoTrack(particle, mother);
116 } else if (particle->getParticleSource() == Belle2::Particle::EParticleSourceObject::c_ECLCluster
117 or particle->getParticleSource() == Belle2::Particle::EParticleSourceObject::c_KLMCluster) {
118 // external reconstructed neutral final-state particle
119 rc = new RecoNeutral(particle, mother);
120 } else if (particle->getMdstArrayIndex()) { // external composite e.g. V0
121 rc = new InternalParticle(particle, mother, config, forceFitAll);
122 } else { // 'internal' particles
123 if (isAResonance(particle)) {
124 rc = new Resonance(particle, mother, config, forceFitAll);
125 } else {
126 rc = new InternalParticle(particle, mother, config, forceFitAll);
127 }
128 }
129 return rc;
130 }

◆ dim()

virtual int dim ( ) const
inlineoverridevirtual

dimension (4)

Reimplemented from InternalParticle.

Definition at line 36 of file Resonance.h.

36{ return 4; }

◆ eneIndex()

int eneIndex ( ) const
inlineinherited

get energy index

Definition at line 134 of file ParticleBase.h.

134{ return hasEnergy() ? momIndex() + 3 : -1 ; }

◆ forceP4Sum()

void forceP4Sum ( FitParams & fitparams) const
overridevirtualinherited

enforce conservation of momentum sum

Reimplemented from ParticleBase.

Definition at line 416 of file InternalParticle.cc.

417 {
418 for (const auto daughter : m_daughters) {
419 daughter->forceP4Sum(fitparams);
420 }
421 const int momindex = momIndex();
422 if (momindex > 0) {
423 const int dim = hasEnergy() ? 4 : 3;
424 Projection p(fitparams.getDimensionOfState(), dim);
425 projectKineConstraint(fitparams, p);
426 fitparams.getStateVector().segment(momindex, dim) -= p.getResiduals().segment(0, dim);
427 }
428 }

◆ hasEnergy()

virtual bool hasEnergy ( ) const
inlineoverridevirtualinherited

has energy in fitparams

Reimplemented from ParticleBase.

Definition at line 70 of file InternalParticle.h.

70{ return true ; }

◆ hasPosition()

virtual bool hasPosition ( ) const
inlineoverridevirtual

does this class have position?

NO

Reimplemented from InternalParticle.

Definition at line 49 of file Resonance.h.

49{ return false; }

◆ index()

int index ( ) const
inlineinherited

get index

Definition at line 91 of file ParticleBase.h.

91{ return m_index ; }

◆ initCovariance()

ErrCode initCovariance ( FitParams & fitparams) const
overridevirtualinherited

init covariance

Reimplemented from ParticleBase.

Definition at line 228 of file InternalParticle.cc.

229 {
230 ErrCode status;
231 ParticleBase::initCovariance(fitparams);
232 for (auto daughter : m_daughters) {
233 status |= daughter->initCovariance(fitparams);
234 }
235 return status;
236 }

◆ initMomentum()

ErrCode initMomentum ( FitParams & fitparams) const
protectedinherited

init momentum of *this and daughters

Definition at line 205 of file InternalParticle.cc.

206 {
207 int momindex = momIndex();
208 fitparams.getStateVector().segment(momindex, 4) = Eigen::Matrix<double, 4, 1>::Zero(4);
209
210 for (auto daughter : m_daughters) {
211 int daumomindex = daughter->momIndex();
212 int maxrow = daughter->hasEnergy() ? 4 : 3;
213
214 double e2 = fitparams.getStateVector().segment(daumomindex, maxrow).squaredNorm();
215 fitparams.getStateVector().segment(momindex, maxrow) += fitparams.getStateVector().segment(daumomindex, maxrow);
216
217 if (maxrow == 3) {
218 double mass = 0;
219 if (daughter->particle()->hasExtraInfo("treeFitterMassConstraintValue")) {
220 mass = daughter->particle()->getExtraInfo("treeFitterMassConstraintValue");
221 } else mass = daughter->particle()->getPDGMass();
222 fitparams.getStateVector()(momindex + 3) += std::sqrt(e2 + mass * mass);
223 }
224 }
225 return ErrCode(ErrCode::Status::success);
226 }

◆ initMotherlessParticle()

ErrCode initMotherlessParticle ( FitParams & fitparams)
overridevirtual

initialise a motherless particle

Reimplemented from InternalParticle.

Definition at line 20 of file Resonance.cc.

21 {
22 ErrCode status;
23 for (auto daughter : m_daughters) {
24 status |= daughter->initMotherlessParticle(fitparams);
25 }
26 return status;
27 }

◆ initParticleWithMother()

ErrCode initParticleWithMother ( FitParams & fitparams)
overridevirtual

initialise a particle with a mother

Reimplemented from InternalParticle.

Definition at line 29 of file Resonance.cc.

30 {
31 ErrCode status;
32 for (auto daughter : m_daughters) {
33 status |= daughter->initParticleWithMother(fitparams);
34 }
35 initMomentum(fitparams);
36 return status;
37 }

◆ initTau()

ErrCode initTau ( FitParams & par) const
protectedinherited

initialises tau as a length

Definition at line 428 of file ParticleBase.cc.

429 {
430 const int tauindex = tauIndex();
431 if (tauindex >= 0 && hasPosition()) {
432
433 const int posindex = posIndex();
434 const int mother_ps_index = mother()->posIndex();
435 const int dim = m_config->m_originDimension; // TODO can we configure this to be particle specific?
436
437 // tau has different meaning depending on the dimension of the constraint
438 // 2-> use x-y projection
439 const Eigen::Matrix < double, 1, -1, 1, 1, 3 > vertex_dist =
440 fitparams.getStateVector().segment(posindex, dim) - fitparams.getStateVector().segment(mother_ps_index, dim);
441 const Eigen::Matrix < double, 1, -1, 1, 1, 3 >
442 mom = fitparams.getStateVector().segment(posindex, dim);
443
444 // if an intermediate vertex is not well defined by a track or so it will be initialised with 0
445 // same for the momentum of for example B0, it might be initialised with 0
446 // in those cases use pdg value
447 const double mom_norm = mom.norm();
448 const double dot = std::abs(vertex_dist.dot(mom));
449 const double tau = dot / mom_norm;
450 if (0 == mom_norm || 0 == dot) {
451 const double mass = m_particle->getPDGMass();
452 if (mass > 0)
453 fitparams.getStateVector()(tauindex) = m_particle->getPDGLifetime() * 1e9 * Belle2::Const::speedOfLight / mass;
454 else
455 fitparams.getStateVector()(tauindex) = 0;
456 } else {
457 fitparams.getStateVector()(tauindex) = tau;
458 }
459 }
460
461 return ErrCode(ErrCode::Status::success);
462 }
Belle2::Const::speedOfLight
static const double speedOfLight
[cm/ns]
Definition Const.h:695
Belle2::dot
T dot(GeneralVector< T > a, GeneralVector< T > b)
dot product of two general vectors
Definition beamHelpers.h:163

◆ isAResonance()

bool isAResonance ( Belle2::Particle * particle)
staticprotectedinherited

controls if a particle is treated as a resonance(lifetime=0) or a particle that has a finite lifetime.

A finite life time means it will register a geo constraint for this particle

Definition at line 132 of file ParticleBase.cc.

133 {
134 bool rc = false ;
135 const int pdgcode = std::abs(particle->getPDGCode());
136
137 if (pdgcode && !(particle->getMdstArrayIndex())) {
138 switch (pdgcode) {
139 case 22: //photon conversion
140 rc = false;
141 break ;
142
143 case -11: //bremsstrahlung
144 case 11:
145 rc = true ;
146 break ;
147 default: //everything with boosted flight length less than 1 micrometer
148 rc = (pdgcode && particle->getPDGLifetime() < 1e-14);
149 }
150 }
151 return rc ;
152 }

◆ locate()

const ParticleBase * locate ( Belle2::Particle * particle) const
inherited

get particle base from basf2 particle

Definition at line 209 of file ParticleBase.cc.

210 {
211 const ParticleBase* rc = (m_particle == particle) ? this : nullptr;
212 if (!rc) {
213 for (auto* daughter : m_daughters) {
214 rc = daughter->locate(particle);
215 if (rc) {break;}
216 }
217 }
218 return rc;
219 }

◆ momIndex()

virtual int momIndex ( ) const
inlineoverridevirtual

get momentum index in statevector

Reimplemented from InternalParticle.

Definition at line 45 of file Resonance.h.

45{ return index(); }

◆ mother()

const ParticleBase * mother ( ) const
inlineinherited

getMother() / hasMother()

Definition at line 94 of file ParticleBase.h.

94{ return m_mother; };

◆ nFinalChargedCandidates()

int nFinalChargedCandidates ( ) const
virtualinherited

number of charged candidates

Reimplemented in RecoTrack.

Definition at line 238 of file ParticleBase.cc.

239 {
240 int rc = 0;
241 for (auto* daughter : m_daughters) {
242 rc += daughter->nFinalChargedCandidates();
243 }
244 return rc;
245 }

◆ parname()

std::string parname ( int index) const
overridevirtual

parameter name

Reimplemented from InternalParticle.

Definition at line 41 of file Resonance.cc.

42 {
43 return ParticleBase::parname(index + 4);
44 }

◆ particle()

Belle2::Particle * particle ( ) const
inlineinherited

get basf2 particle

Definition at line 88 of file ParticleBase.h.

88{ return m_particle ; }

◆ posIndex()

virtual int posIndex ( ) const
inlineoverridevirtual

get position index in statevector x,y,z,tau,px,py,pz

Reimplemented from InternalParticle.

Definition at line 43 of file Resonance.h.

43{ return mother()->posIndex(); }

◆ projectBeamConstraint()

ErrCode projectBeamConstraint ( const FitParams & fitparams,
Projection & p ) const
inherited

project beam four momentum constraint

Definition at line 290 of file InternalParticle.cc.

292 {
293
294 const int momindex = momIndex() ;
295
296 const Eigen::Matrix<double, 4, 1> fitMomE = fitparams.getStateVector().segment(momindex, 4);
297
298 p.getResiduals() = m_config->m_beamMomE - fitMomE;
299
300 for (int row = 0; row < 4; ++row) {
301 p.getH()(row, momindex + row) = -1;
302 }
303
304 p.getV() = m_config->m_beamCovariance;
305
306 return ErrCode(ErrCode::Status::success) ;
307 }

◆ projectConstraint()

ErrCode projectConstraint ( const Constraint::Type type,
const FitParams & fitparams,
Projection & p ) const
overridevirtualinherited

find out which constraint it is and project

Reimplemented from ParticleBase.

Definition at line 310 of file InternalParticle.cc.

313 {
314 ErrCode status;
315 switch (type) {
316 case Constraint::mass:
317 status |= projectMassConstraint(fitparams, p);
318 break;
319 case Constraint::geometric:
320 status |= projectGeoConstraint(fitparams, p);
321 break;
322 case Constraint::kinematic:
323 status |= projectKineConstraint(fitparams, p);
324 break;
325 case Constraint::beam:
326 status |= projectBeamConstraint(fitparams, p);
327 break;
328 default:
329 status |= ParticleBase::projectConstraint(type, fitparams, p);
330 }
331
332 return status;
333 }

◆ projectGeoConstraint()

ErrCode projectGeoConstraint ( const FitParams & fitparams,
Projection & p ) const
virtualinherited

project geometrical constraint

the direction of the momentum is very well known from the kinematic constraints that is why we do not extract the distance as a vector here

Definition at line 247 of file ParticleBase.cc.

248 {
249 assert(m_config);
250 // only allow 2d for head of tree particles that are beam constrained
251 const int dim = m_config->m_originDimension == 2 && std::abs(m_particle->getPDGCode()) == m_config->m_headOfTreePDG ? 2 : 3;
252 const int posindexmother = mother()->posIndex();
253 const int posindex = posIndex();
254 const int tauindex = tauIndex();
255 const int momindex = momIndex();
256
257 const double tau = fitparams.getStateVector()(tauindex);
258 Eigen::VectorXd x_vec = fitparams.getStateVector().segment(posindex, dim);
259 Eigen::VectorXd x_m = fitparams.getStateVector().segment(posindexmother, dim);
260 Eigen::VectorXd p_vec = fitparams.getStateVector().segment(momindex, dim);
261 const double mom = p_vec.norm();
262 const double mom3 = mom * mom * mom;
263
264 if (3 == dim) {
265 // we can already set these
266 //diagonal momentum
267 p.getH()(0, momindex) = tau * (p_vec(1) * p_vec(1) + p_vec(2) * p_vec(2)) / mom3 ;
268 p.getH()(1, momindex + 1) = tau * (p_vec(0) * p_vec(0) + p_vec(2) * p_vec(2)) / mom3 ;
269 p.getH()(2, momindex + 2) = tau * (p_vec(0) * p_vec(0) + p_vec(1) * p_vec(1)) / mom3 ;
270
271 //offdiagonal momentum
272 p.getH()(0, momindex + 1) = - tau * p_vec(0) * p_vec(1) / mom3 ;
273 p.getH()(0, momindex + 2) = - tau * p_vec(0) * p_vec(2) / mom3 ;
274
275 p.getH()(1, momindex + 0) = - tau * p_vec(1) * p_vec(0) / mom3 ;
276 p.getH()(1, momindex + 2) = - tau * p_vec(1) * p_vec(2) / mom3 ;
277
278 p.getH()(2, momindex + 0) = - tau * p_vec(2) * p_vec(0) / mom3 ;
279 p.getH()(2, momindex + 1) = - tau * p_vec(2) * p_vec(1) / mom3 ;
280
281 } else if (2 == dim) {
282
283 // NOTE THAT THESE ARE DIFFERENT IN 2d
284 p.getH()(0, momindex) = tau * (p_vec(1) * p_vec(1)) / mom3 ;
285 p.getH()(1, momindex + 1) = tau * (p_vec(0) * p_vec(0)) / mom3 ;
286
287 //offdiagonal momentum
288 p.getH()(0, momindex + 1) = - tau * p_vec(0) * p_vec(1) / mom3 ;
289 p.getH()(1, momindex + 0) = - tau * p_vec(1) * p_vec(0) / mom3 ;
290 } else {
291 B2FATAL("Dimension of Geometric constraint is not 2 or 3. This will crash many things. You should feel bad.");
292 }
293
294 // --- Fill residuals and remaining Jacobian entries ---
298 Eigen::VectorXd residuals = x_m + tau * p_vec / mom - x_vec;
299 p.getResiduals().segment(0, dim) = residuals;
300
301 for (int row = 0; row < dim; ++row) {
302 p.getH()(row, posindexmother + row) = 1;
303 p.getH()(row, posindex + row) = -1;
304 p.getH()(row, tauindex) = p_vec(row) / mom;
305 }
306
307 return ErrCode(ErrCode::Status::success);
308 }

◆ projectKineConstraint()

ErrCode projectKineConstraint ( const FitParams & fitparams,
Projection & p ) const
inherited

project kinematical constraint

Definition at line 239 of file InternalParticle.cc.

241 {
242 const int momindex = momIndex();
243
244 // `this` always has an energy row
245 p.getResiduals().segment(0, 4) = fitparams.getStateVector().segment(momindex, 4);
246
247 for (int imom = 0; imom < 4; ++imom) {
248 p.getH()(imom, momindex + imom) = 1;
249 }
250
251 for (const auto daughter : m_daughters) {
252 const int daumomindex = daughter->momIndex();
253 const Eigen::Matrix<double, 1, 3> p3_vec = fitparams.getStateVector().segment(daumomindex, 3);
254
255 // three momentum is easy just subtract the vectors
256 p.getResiduals().segment(0, 3) -= p3_vec;
257
258 // energy depends on the parametrisation!
259 if (daughter->hasEnergy()) {
260 p.getResiduals()(3) -= fitparams.getStateVector()(daumomindex + 3);
261 p.getH()(3, daumomindex + 3) = -1; // d/dE -E
262 } else {
263 // m^2 + p^2 = E^2
264 // so
265 // E = sqrt(m^2 + p^2)
266 double mass = 0;
267 if (daughter->particle()->hasExtraInfo("treeFitterMassConstraintValue")) {
268 mass = daughter->particle()->getExtraInfo("treeFitterMassConstraintValue");
269 } else mass = daughter->particle()->getPDGMass();
270 const double p2 = p3_vec.squaredNorm();
271 const double energy = std::sqrt(mass * mass + p2);
272 p.getResiduals()(3) -= energy;
273
274 for (unsigned i = 0; i < 3; ++i) {
275 // d/dpx_i sqrt(m^2 + p^2)
276 p.getH()(3, daumomindex + i) = -1 * p3_vec(i) / energy;
277 }
278 }
279
280 // this has to be in any case
281 // d/dp_i p_i
282 for (unsigned i = 0; i < 3; ++i) {
283 p.getH()(i, daumomindex + i) = -1;
284 }
285 }
286 return ErrCode(ErrCode::Status::success);
287 }

◆ projectMassConstraint()

ErrCode projectMassConstraint ( const FitParams & fitparams,
Projection & p ) const
virtualinherited

project mass constraint abstract

Definition at line 407 of file ParticleBase.cc.

409 {
410 assert(m_config);
411 if (m_config->m_massConstraintType == 0) {
412 return projectMassConstraintParticle(fitparams, p);
413 } else {
414 return projectMassConstraintDaughters(fitparams, p);
415 }
416 }

◆ projectMassConstraintDaughters()

ErrCode projectMassConstraintDaughters ( const FitParams & fitparams,
Projection & p ) const
virtualinherited

project mass constraint using the parameters of the daughters

be aware that the signs here are important E-|p|-m extracts a negative mass and messes with the momentum !

Definition at line 310 of file ParticleBase.cc.

312 {
313 double mass = 0;
314 if (particle()->hasExtraInfo("treeFitterMassConstraintValue")) {
315 mass = particle()->getExtraInfo("treeFitterMassConstraintValue");
316 } else mass = particle()->getPDGMass();
317 const double mass2 = mass * mass;
318 double px = 0;
319 double py = 0;
320 double pz = 0;
321 double E = 0;
322
323 // the parameters of the daughters must be used otherwise the mass constraint does not have an effect on the extracted daughter momenta
324 for (const auto* daughter : m_daughters) {
325 const int momindex = daughter->momIndex();
326 // in most cases the daughters will be final states so we cache the value to use it in the energy column
327 const double px_daughter = fitparams.getStateVector()(momindex);
328 const double py_daughter = fitparams.getStateVector()(momindex + 1);
329 const double pz_daughter = fitparams.getStateVector()(momindex + 2);
330
331 px += px_daughter;
332 py += py_daughter;
333 pz += pz_daughter;
334 if (daughter->hasEnergy()) {
335 E += fitparams.getStateVector()(momindex + 3);
336 } else {
337 // final states dont have an energy index
338 double m = 0;
339 if (daughter->particle()->hasExtraInfo("treeFitterMassConstraintValue")) {
340 m = daughter->particle()->getExtraInfo("treeFitterMassConstraintValue");
341 } else m = daughter->particle()->getPDGMass();
342 E += std::sqrt(m * m + px_daughter * px_daughter + py_daughter * py_daughter + pz_daughter * pz_daughter);
343 }
344 }
345
349 p.getResiduals()(0) = mass2 - E * E + px * px + py * py + pz * pz;
350
351 for (const auto* daughter : m_daughters) {
352 //dr/dx = d/dx m2-{E1+E2+...}^2+{p1+p2+...}^2 = 2*x (x= E or p)
353 const int momindex = daughter->momIndex();
354 Eigen::Vector3d mom(px, py, pz);
355 p.getH().block<1, 3>(0, momindex) = 2.0 * mom;
356
357 if (daughter->hasEnergy()) {
358 p.getH()(0, momindex + 3) = -2.0 * E;
359 } else {
360 Eigen::Vector3d mom_daughter = fitparams.getStateVector().segment<3>(momindex);
361 double m = 0;
362 if (daughter->particle()->hasExtraInfo("treeFitterMassConstraintValue")) {
363 m = daughter->particle()->getExtraInfo("treeFitterMassConstraintValue");
364 } else m = daughter->particle()->getPDGMass();
365
366 const double E_daughter = std::sqrt(m * m + mom_daughter.squaredNorm());
367 const double E_by_E_daughter = E / E_daughter;
368 p.getH().block<1, 3>(0, momindex) -= 2.0 * E_by_E_daughter * mom_daughter;
369 }
370
371 }
372 return ErrCode(ErrCode::Status::success);
373 }
E
R E
internal precision of FFTW codelets
Definition DiscreteCosineTransform_31points.cc:36

◆ projectMassConstraintParticle()

ErrCode projectMassConstraintParticle ( const FitParams & fitparams,
Projection & p ) const
virtualinherited

project mass constraint using the particles parameters

be aware that the signs here are important E-|p|-m extracts a negative mass and messes with the momentum !

Definition at line 375 of file ParticleBase.cc.

377 {
378 double mass = 0;
379 if (particle()->hasExtraInfo("treeFitterMassConstraintValue")) mass = particle()->getExtraInfo("treeFitterMassConstraintValue");
380 else mass = particle()->getPDGMass();
381 const double mass2 = mass * mass;
382 const int momindex = momIndex();
383 Eigen::Vector4d state = fitparams.getStateVector().segment<4>(momindex);
384 Eigen::Vector3d p3 = state.head<3>();
385 const double px = state(0);
386 const double py = state(1);
387 const double pz = state(2);
388 const double E = state(3);
389
393 p.getResiduals()(0) = mass2 - E * E + px * px + py * py + pz * pz;
394
395 p.getH().block<1, 3>(0, momindex) = 2.0 * p3;
396 p.getH()(0, momindex + 3) = -2.0 * E;
397
398 // TODO 0 in most cases -> needs special treatment if width=0 to not crash chi2 calculation
399 // const double width = TDatabasePDG::Instance()->GetParticle(particle()->getPDGCode())->Width();
400 // transport measurement uncertainty into residual system
401 // f' = sigma_x^2 * (df/dx)^2
402 // p.getV()(0) = width * width * 4 * mass2;
403
404 return ErrCode(ErrCode::Status::success);
405 }

◆ removeDaughter()

void removeDaughter ( const ParticleBase * pb)
virtualinherited

remove daughter

Definition at line 71 of file ParticleBase.cc.

72 {
73 auto iter = std::find(m_daughters.begin(), m_daughters.end(), pb);
74 if (iter != m_daughters.end()) {
75 delete *iter;
76 m_daughters.erase(iter);
77 } else {
78 B2ERROR("Cannot remove particle, because not found ...");
79 }
80 }

◆ retrieveIndexMap()

void retrieveIndexMap ( indexmap & anindexmap) const
virtualinherited

get index map

Definition at line 221 of file ParticleBase.cc.

222 {
223 map.push_back(std::pair<const ParticleBase*, int>(this, index()));
224 for (auto* daughter : m_daughters) {
225 daughter->retrieveIndexMap(map);
226 }
227 }

◆ setIndex()

void setIndex ( int i)
inlineprotectedinherited

set Index (in statevector)

Definition at line 185 of file ParticleBase.h.

185{ m_index = i ; }

◆ setMassConstraint()

void setMassConstraint ( bool b)
inlineinherited

set mass constraint flag

Definition at line 82 of file InternalParticle.h.

82{ m_massconstraint = b ; }

◆ setMother()

void setMother ( const ParticleBase * m)
inlineinherited

set mother

Definition at line 160 of file ParticleBase.h.

160{ m_mother = m ; }

◆ tauIndex()

virtual int tauIndex ( ) const
inlineoverridevirtual

get tau (lifetime) index in statevector

Reimplemented from InternalParticle.

Definition at line 47 of file Resonance.h.

47{ return -1; }

◆ type()

virtual int type ( ) const
inlineoverridevirtual

particle type

Reimplemented from InternalParticle.

Definition at line 38 of file Resonance.h.

38{ return kResonance; }

◆ updateIndex()

void updateIndex ( int & offset)
virtualinherited

this sets the index for momentum, position, etc.

in the statevector

Definition at line 82 of file ParticleBase.cc.

83 {
84 for (auto* daughter : m_daughters) {
85 daughter->updateIndex(offset);
86 }
87 m_index = offset;
88 offset += dim();
89 }

Member Data Documentation

◆ m_automatic_vertex_constraining

bool m_automatic_vertex_constraining
privateinherited

automatically figure out if mother and particle vertex should be the same and also add geometric constraints

Definition at line 114 of file InternalParticle.h.

◆ m_beamconstraint

bool m_beamconstraint
privateinherited

has beam constraint

Definition at line 98 of file InternalParticle.h.

◆ m_config

const ConstraintConfiguration* m_config
protectedinherited

has all the constraint config

Definition at line 200 of file ParticleBase.h.

◆ m_daughters

std::vector<ParticleBase*> m_daughters
protectedinherited

daughter container

Definition at line 194 of file ParticleBase.h.

◆ m_geo_constraint

bool m_geo_constraint
privateinherited

use a geo metric constraint

Definition at line 104 of file InternalParticle.h.

◆ m_index

int m_index
privateinherited

index

Definition at line 204 of file ParticleBase.h.

◆ m_isconversion

bool m_isconversion
privateinherited

is conversion

Definition at line 110 of file InternalParticle.h.

◆ m_isStronglyDecayingResonance

bool m_isStronglyDecayingResonance
protectedinherited

decay length less than 1 micron

Definition at line 197 of file ParticleBase.h.

◆ m_lifetimeconstraint

bool m_lifetimeconstraint
privateinherited

has lifetime constraint

Definition at line 107 of file InternalParticle.h.

◆ m_massconstraint

bool m_massconstraint
privateinherited

has mass constraint

Definition at line 95 of file InternalParticle.h.

◆ m_mother

const ParticleBase* m_mother
protectedinherited

motherparticle

Definition at line 191 of file ParticleBase.h.

◆ m_name

std::string m_name
privateinherited

name

Definition at line 207 of file ParticleBase.h.

◆ m_particle

Belle2::Particle* m_particle
protectedinherited

pointer to framework type

Definition at line 188 of file ParticleBase.h.

◆ m_shares_vertex_with_mother

bool m_shares_vertex_with_mother
privateinherited

shares vertex with mother, that means decay vertex = productionvertex

Definition at line 101 of file InternalParticle.h.

The documentation for this class was generated from the following files: