Belle II Software development
Public Types | Public Member Functions | Static Public Member Functions | Protected Types | Protected Member Functions | Static Protected Member Functions | Protected Attributes | Private Attributes | List of all members
Origin Class Reference

representation of the beamspot as a particle More...

#include <Origin.h>

Inheritance diagram for Origin:
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

 Origin (Belle2::Particle *particle, const ConstraintConfiguration &config, const bool forceFitAll)
 Constructor.
 
 Origin (Belle2::Particle *daughter)
 Constructor.
 
virtual ~Origin ()
 destructor
 
virtual ErrCode initParticleWithMother (FitParams &fitparams) override
 init particle, used if it has a mother
 
virtual ErrCode initMotherlessParticle (FitParams &fitparams) override
 init particle, used if it has no mother
 
ErrCode initOrigin ()
 init the origin "particle"
 
virtual int dim () const override
 space reserved in fit pars
 
virtual ErrCode initCovariance (FitParams &fitpar) const override
 init covariance matrix of the constraint
 
virtual int type () const override
 get particle type
 
ErrCode projectOriginConstraint (const FitParams &fitpar, Projection &) const
 the actual constraint projection
 
virtual ErrCode projectConstraint (Constraint::Type, const FitParams &, Projection &) const override
 the abstract projection
 
virtual void addToConstraintList (constraintlist &list, int depth) const override
 adds the origin as a particle to the constraint list
 
virtual int posIndex () const override
 vertex position index in the statevector
 
virtual int momIndex () const override
 momentum index in the statevector.
 
virtual int tauIndex () const override
 the lifetime index.
 
virtual bool hasEnergy () const override
 has energy
 
virtual std::string name () const
 get name
 
virtual void updateIndex (int &offset)
 this sets the index for momentum, position, etc.
 
virtual std::string parname (int index) const
 get name of parameter i
 
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
 
virtual void forceP4Sum (FitParams &) const
 force p4 sum conservation all along the tree
 
virtual bool hasPosition () const
 get false
 
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 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
 

Private Attributes

const int m_constraintDimension
 dimension of the constraint
 
const std::vector< double > m_customOriginVertex
 vertex coordinates
 
const std::vector< double > m_customOriginCovariance
 vertex covariance
 
Eigen::Matrix< double, Eigen::Dynamic, 1, Eigen::ColMajor, 3, 1 > m_posVec
 vertex position of the origin
 
Eigen::Matrix< double, Eigen::Dynamic, Eigen::Dynamic, Eigen::ColMajor, 3, 3 > m_covariance
 covariance of the origin dont know size but I know the max size
 
const bool m_isBeamSpot
 is this the beam constraint?
 
Belle2::DBObjPtr< Belle2::BeamSpot > m_beamSpot
 the parameters are initialize elsewhere this is just a pointer to that
 
const int m_inflationFactorCovZ
 inflated the covariance matrix in z by this number
 
int m_index
 index
 
std::string m_name
 name
 

Detailed Description

representation of the beamspot as a particle

Definition at line 21 of file Origin.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

◆ Origin()

Origin ( Belle2::Particle * particle,
const ConstraintConfiguration & config,
const bool forceFitAll )

Constructor.

Definition at line 21 of file Origin.cc.

24 :
25 ParticleBase("Origin"),
26 m_constraintDimension(config.m_originDimension), //this also affects the geometric constraint
27 m_customOriginVertex(config.m_customOriginVertex),
28 m_customOriginCovariance(config.m_customOriginCovariance),
29 m_posVec(config.m_originDimension),
30 m_covariance(config.m_originDimension, config.m_originDimension),
31 m_isBeamSpot(config.m_ipConstraint),
32 m_inflationFactorCovZ(config.m_inflationFactorCovZ)
33 {
34 addDaughter(daughter, config, forceFitAll);
35 initOrigin();
36 }

◆ ~Origin()

virtual ~Origin ( )
inlinevirtual

destructor

Definition at line 35 of file Origin.h.

35{};

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
overridevirtual

adds the origin as a particle to the constraint list

Implements ParticleBase.

Definition at line 158 of file Origin.cc.

159 {
160 for (auto daughter : m_daughters) {
161 daughter->addToConstraintList(list, depth - 1);
162 }
163 list.push_back(Constraint(this, Constraint::origin, depth, m_constraintDimension)) ;
164 }

◆ 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 }

◆ 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

space reserved in fit pars

Implements ParticleBase.

Definition at line 47 of file Origin.h.

47{ return m_constraintDimension; }

◆ eneIndex()

int eneIndex ( ) const
inlineinherited

get energy index

Definition at line 134 of file ParticleBase.h.

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

◆ forceP4Sum()

virtual void forceP4Sum ( FitParams & ) const
inlinevirtualinherited

force p4 sum conservation all along the tree

Reimplemented in InternalParticle.

Definition at line 112 of file ParticleBase.h.

112{} ;

◆ hasEnergy()

virtual bool hasEnergy ( ) const
inlineoverridevirtual

has energy

Reimplemented from ParticleBase.

Definition at line 74 of file Origin.h.

74{ return false; }

◆ hasPosition()

virtual bool hasPosition ( ) const
inlinevirtualinherited

get false

Reimplemented in Composite, InternalParticle, and Resonance.

Definition at line 131 of file ParticleBase.h.

131{ 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 & fitpar) const
overridevirtual

init covariance matrix of the constraint

Reimplemented from ParticleBase.

Definition at line 113 of file Origin.cc.

114 {
115 ErrCode status;
116 const int posindex = posIndex();
117 for (int row = 0; row < m_constraintDimension; ++row) {
118 fitpar.getCovariance()(posindex + row, posindex + row) = 1000 * m_covariance(row, row);
119 }
120 for (auto daughter : m_daughters) {
121 status |= daughter->initCovariance(fitpar);
122 }
123 return status;
124 }

◆ initMotherlessParticle()

ErrCode initMotherlessParticle ( FitParams & fitparams)
overridevirtual

init particle, used if it has no mother

Implements ParticleBase.

Definition at line 43 of file Origin.cc.

44 {
45 ErrCode status;
46 const int posindex = posIndex();
47 fitparams.getStateVector().segment(posindex, m_constraintDimension) = m_posVec.segment(0, m_constraintDimension);
48
49 for (auto daughter : m_daughters) {
50 status |= daughter->initMotherlessParticle(fitparams);
51 status |= daughter->initParticleWithMother(fitparams);
52 }
53
54 return status;
55 }

◆ initOrigin()

ErrCode initOrigin ( )

init the origin "particle"

Definition at line 57 of file Origin.cc.

58 {
59 if (m_beamSpot && m_isBeamSpot && m_constraintDimension == 3) {
60 m_covariance = Eigen::Matrix<double, 3, 3>::Zero(3, 3);
61 const ROOT::Math::XYZVector& vertexVector = m_beamSpot->getIPPosition();
62 const TMatrixDSym& covVertex = m_beamSpot->getCovVertex();
63 m_posVec(0) = vertexVector.X();
64 m_posVec(1) = vertexVector.Y();
65 m_posVec(2) = vertexVector.Z();
66 m_covariance(0, 0) = covVertex(0, 0);
67 m_covariance(1, 1) = covVertex(1, 1);
68 m_covariance(2, 2) = covVertex(2, 2);
69 m_covariance(1, 0) = covVertex(1, 0);
70 m_covariance(2, 0) = covVertex(2, 0);
71 m_covariance(2, 1) = covVertex(2, 1);
72
73 } else if (m_beamSpot && m_isBeamSpot && m_constraintDimension == 2) {
74 m_covariance = Eigen::Matrix<double, 2, 2>::Zero(2, 2);
75 const ROOT::Math::XYZVector& vertexVector = m_beamSpot->getIPPosition();
76 const TMatrixDSym& covVertex = m_beamSpot->getCovVertex();
77 m_posVec(0) = vertexVector.X();
78 m_posVec(1) = vertexVector.Y();
79 m_covariance(0, 0) = covVertex(0, 0);
80 m_covariance(1, 1) = covVertex(1, 1);
81 m_covariance(1, 0) = covVertex(1, 0);
82
83 } else if (!m_isBeamSpot && m_constraintDimension == 3) {
84
85 if (!(m_customOriginVertex.size() == 3) || !(m_customOriginCovariance.size() == 9)) {
86 B2FATAL("Incorrect dimension of customOriginVertex or customOriginCovariance. customOriginVertex dim = "
87 << m_customOriginVertex.size() << " customOriginCovariance dim = " << m_customOriginCovariance.size());
88 } else if ((m_customOriginCovariance.at(0) < 0) || (m_customOriginCovariance.at(4) < 0) || (m_customOriginCovariance.at(8) < 0)) {
89 B2WARNING("An element of customOriginCovariance diagonal is smaller than 0.");
90 return ErrCode(ErrCode::Status::badsetup);
91 }
92 m_posVec(0) = m_customOriginVertex[0];
93 m_posVec(1) = m_customOriginVertex[1];
94 m_posVec(2) = m_customOriginVertex[2];
95 m_covariance(0, 0) = m_customOriginCovariance[0];
96 m_covariance(0, 1) = m_customOriginCovariance[1];
97 m_covariance(1, 0) = m_customOriginCovariance[3];
98 m_covariance(1, 1) = m_customOriginCovariance[4];
99
100 // all with z
101 m_covariance(1, 2) = m_inflationFactorCovZ * m_customOriginCovariance[5];
102 m_covariance(2, 0) = m_inflationFactorCovZ * m_customOriginCovariance[6];
103 m_covariance(2, 1) = m_inflationFactorCovZ * m_customOriginCovariance[7];
104 m_covariance(2, 2) = m_inflationFactorCovZ * m_customOriginCovariance[8];
105 m_covariance(0, 2) = m_inflationFactorCovZ * m_customOriginCovariance[2];
106 } else {
107 B2FATAL("The Origin is nether beamspot nor custom. This is ether a configuration error or no beam parameters were found to build the beam spot.");
108 }
109
110 return ErrCode(ErrCode::Status::success);
111 }

◆ initParticleWithMother()

ErrCode initParticleWithMother ( FitParams & fitparams)
overridevirtual

init particle, used if it has a mother

Implements ParticleBase.

Definition at line 38 of file Origin.cc.

39 {
40 return ErrCode(ErrCode::Status::success);
41 }

◆ 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

momentum index in the statevector.

no value for beamspot as a particle

Reimplemented from ParticleBase.

Definition at line 68 of file Origin.h.

68{ return -1; }

◆ mother()

const ParticleBase * mother ( ) const
inlineinherited

getMother() / hasMother()

Definition at line 94 of file ParticleBase.h.

94{ return m_mother; };

◆ name()

virtual std::string name ( ) const
inlinevirtual

get name

Definition at line 77 of file Origin.h.

77{ return "Origin"; }

◆ 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
virtualinherited

get name of parameter i

Reimplemented in InternalParticle, RecoParticle, RecoResonance, and Resonance.

Definition at line 192 of file ParticleBase.cc.

193 {
194 std::string rc = m_name;
195 switch (thisindex) {
196 case 0: rc += "_x "; break;
197 case 1: rc += "_y "; break;
198 case 2: rc += "_z "; break;
199 case 3: rc += "_tau"; break;
200 case 4: rc += "_px "; break;
201 case 5: rc += "_py "; break;
202 case 6: rc += "_pz "; break;
203 case 7: rc += "_E "; break;
204 default:;
205 }
206 return rc;
207 }

◆ 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

vertex position index in the statevector

Reimplemented from ParticleBase.

Definition at line 65 of file Origin.h.

65{ return index(); }

◆ projectConstraint()

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

the abstract projection

Reimplemented from ParticleBase.

Definition at line 145 of file Origin.cc.

146 {
147 ErrCode status;
148 switch (type) {
149 case Constraint::origin:
150 status |= projectOriginConstraint(fitparams, p);
151 break;
152 default:
153 status |= ParticleBase::projectConstraint(type, fitparams, p);
154 }
155 return status;
156 }

◆ 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 }

◆ 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 }

◆ projectOriginConstraint()

ErrCode projectOriginConstraint ( const FitParams & fitpar,
Projection & p ) const

the actual constraint projection

Definition at line 126 of file Origin.cc.

127 {
128 const int posindex = posIndex();
129
130 p.getResiduals().segment(0, m_constraintDimension) =
131 m_posVec.segment(0, m_constraintDimension) -
132 fitparams.getStateVector().segment(posindex, m_constraintDimension);
133
134 for (int row = 0; row < m_constraintDimension; ++row) {
135 p.getH()(row, posindex + row) = -1;
136
137 for (int col = 0; col <= row; ++col) {
138 p.getV()(row, col) = m_covariance(row, col);
139 }
140 }
141
142 return ErrCode(ErrCode::Status::success);
143 }

◆ 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 ; }

◆ 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

the lifetime index.

the origin does not have a lifetime

Reimplemented from ParticleBase.

Definition at line 71 of file Origin.h.

71{ return -1; }

◆ type()

virtual int type ( ) const
inlineoverridevirtual

get particle type

Implements ParticleBase.

Definition at line 53 of file Origin.h.

53{ return kOrigin; }

◆ 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_beamSpot

Belle2::DBObjPtr<Belle2::BeamSpot> m_beamSpot
private

the parameters are initialize elsewhere this is just a pointer to that

Definition at line 102 of file Origin.h.

◆ m_config

const ConstraintConfiguration* m_config
protectedinherited

has all the constraint config

Definition at line 200 of file ParticleBase.h.

◆ m_constraintDimension

const int m_constraintDimension
private

dimension of the constraint

Definition at line 82 of file Origin.h.

◆ m_covariance

Eigen::Matrix<double, Eigen::Dynamic, Eigen::Dynamic, Eigen::ColMajor, 3, 3> m_covariance
private

covariance of the origin dont know size but I know the max size

Definition at line 96 of file Origin.h.

◆ m_customOriginCovariance

const std::vector<double> m_customOriginCovariance
private

vertex covariance

Definition at line 88 of file Origin.h.

◆ m_customOriginVertex

const std::vector<double> m_customOriginVertex
private

vertex coordinates

Definition at line 85 of file Origin.h.

◆ m_daughters

std::vector<ParticleBase*> m_daughters
protectedinherited

daughter container

Definition at line 194 of file ParticleBase.h.

◆ m_index

int m_index
privateinherited

index

Definition at line 204 of file ParticleBase.h.

◆ m_inflationFactorCovZ

const int m_inflationFactorCovZ
private

inflated the covariance matrix in z by this number

Definition at line 105 of file Origin.h.

◆ m_isBeamSpot

const bool m_isBeamSpot
private

is this the beam constraint?

Definition at line 99 of file Origin.h.

◆ m_isStronglyDecayingResonance

bool m_isStronglyDecayingResonance
protectedinherited

decay length less than 1 micron

Definition at line 197 of file ParticleBase.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_posVec

Eigen::Matrix<double, Eigen::Dynamic, 1, Eigen::ColMajor, 3, 1> m_posVec
private

vertex position of the origin

Definition at line 91 of file Origin.h.

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