Belle II Software prerelease-10-00-00a
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>

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Public Types

enum  TFParticleType {
  kInteractionPoint ,
  kOrigin ,
  kComposite ,
  kRecoResonance ,
  kInternalParticle ,
  kRecoTrack ,
  kResonance ,
  kRecoPhoton ,
  kRecoKlong ,
  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 19 of file Origin.h.

Member Typedef Documentation

◆ constraintlist

typedef std::vector<Constraint> constraintlist
inherited

alias

Definition at line 52 of file ParticleBase.h.

◆ indexmap

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

alias

Definition at line 55 of file ParticleBase.h.

◆ ParticleContainer

typedef std::vector<ParticleBase*> ParticleContainer
protectedinherited

just an alias

Definition at line 178 of file ParticleBase.h.

Member Enumeration Documentation

◆ TFParticleType

enum TFParticleType
inherited

particle types

Definition at line 30 of file ParticleBase.h.

30 {kInteractionPoint,
31 kOrigin,
32 kComposite,
33 kRecoResonance,
34 kInternalParticle,
35 kRecoTrack,
36 kResonance,
37 kRecoPhoton,
38 kRecoKlong,
39 kMissingParticle
40 };

Constructor & Destructor Documentation

◆ Origin()

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

Constructor.

Definition at line 19 of file Origin.cc.

22 :
23 ParticleBase("Origin"),
24 m_constraintDimension(config.m_originDimension), //this also affects the geometric constraint
25 m_customOriginVertex(config.m_customOriginVertex),
26 m_customOriginCovariance(config.m_customOriginCovariance),
27 m_posVec(config.m_originDimension),
28 m_covariance(config.m_originDimension, config.m_originDimension),
29 m_isBeamSpot(config.m_ipConstraint),
30 m_inflationFactorCovZ(config.m_inflationFactorCovZ)
31 {
32 addDaughter(daughter, config, forceFitAll);
33 initOrigin();
34 }

◆ ~Origin()

virtual ~Origin ( )
inlinevirtual

destructor

Definition at line 33 of file Origin.h.

33{};

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 156 of file Origin.cc.

157 {
158 for (auto daughter : m_daughters) {
159 daughter->addToConstraintList(list, depth - 1);
160 }
161 list.push_back(Constraint(this, Constraint::origin, depth, m_constraintDimension)) ;
162 }

◆ charge()

int charge ( ) const
inlineinherited

get charge

Definition at line 144 of file ParticleBase.h.

145 {
146 if (m_particle->getPDGCode()) {
147 double fltcharge = m_particle->getCharge();
148 return fltcharge < 0 ? int(fltcharge - 0.5) : int(fltcharge + 0.5);
149 } else {
150 return m_particle->getCharge() > 0 ? 1 : (m_particle->getCharge() < 0 ? -1 : 0);
151 }
152 }

◆ 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->getECLCluster()) { // external reconstructed photon
117 rc = new RecoPhoton(particle, mother);
118 } else if (particle->getKLMCluster()) { // external reconstructed klong
119 rc = new RecoKlong(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 45 of file Origin.h.

45{ return m_constraintDimension; }

◆ eneIndex()

int eneIndex ( ) const
inlineinherited

get energy index

Definition at line 138 of file ParticleBase.h.

138{ 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 116 of file ParticleBase.h.

116{} ;

◆ hasEnergy()

virtual bool hasEnergy ( ) const
inlineoverridevirtual

has energy

Reimplemented from ParticleBase.

Definition at line 72 of file Origin.h.

72{ return false; }

◆ hasPosition()

virtual bool hasPosition ( ) const
inlinevirtualinherited

get false

Reimplemented in Composite, InternalParticle, and Resonance.

Definition at line 135 of file ParticleBase.h.

135{ return false ; }

◆ index()

int index ( ) const
inlineinherited

get index

Definition at line 95 of file ParticleBase.h.

95{ return m_index ; }

◆ initCovariance()

ErrCode initCovariance ( FitParams & fitpar) const
overridevirtual

init covariance matrix of the constraint

Reimplemented from ParticleBase.

Definition at line 111 of file Origin.cc.

112 {
113 ErrCode status;
114 const int posindex = posIndex();
115 for (int row = 0; row < m_constraintDimension; ++row) {
116 fitpar.getCovariance()(posindex + row, posindex + row) = 1000 * m_covariance(row, row);
117 }
118 for (auto daughter : m_daughters) {
119 status |= daughter->initCovariance(fitpar);
120 }
121 return status;
122 }

◆ initMotherlessParticle()

ErrCode initMotherlessParticle ( FitParams & fitparams)
overridevirtual

init particle, used if it has no mother

Implements ParticleBase.

Definition at line 41 of file Origin.cc.

42 {
43 ErrCode status;
44 const int posindex = posIndex();
45 fitparams.getStateVector().segment(posindex, m_constraintDimension) = m_posVec.segment(0, m_constraintDimension);
46
47 for (auto daughter : m_daughters) {
48 status |= daughter->initMotherlessParticle(fitparams);
49 status |= daughter->initParticleWithMother(fitparams);
50 }
51
52 return status;
53 }

◆ initOrigin()

ErrCode initOrigin ( )

init the origin "particle"

Definition at line 55 of file Origin.cc.

56 {
57 if (m_beamSpot && m_isBeamSpot && m_constraintDimension == 3) {
58 m_covariance = Eigen::Matrix<double, 3, 3>::Zero(3, 3);
59 const ROOT::Math::XYZVector& vertexVector = m_beamSpot->getIPPosition();
60 const TMatrixDSym& covVertex = m_beamSpot->getCovVertex();
61 m_posVec(0) = vertexVector.X();
62 m_posVec(1) = vertexVector.Y();
63 m_posVec(2) = vertexVector.Z();
64 m_covariance(0, 0) = covVertex(0, 0);
65 m_covariance(1, 1) = covVertex(1, 1);
66 m_covariance(2, 2) = covVertex(2, 2);
67 m_covariance(1, 0) = covVertex(1, 0);
68 m_covariance(2, 0) = covVertex(2, 0);
69 m_covariance(2, 1) = covVertex(2, 1);
70
71 } else if (m_beamSpot && m_isBeamSpot && m_constraintDimension == 2) {
72 m_covariance = Eigen::Matrix<double, 2, 2>::Zero(2, 2);
73 const ROOT::Math::XYZVector& vertexVector = m_beamSpot->getIPPosition();
74 const TMatrixDSym& covVertex = m_beamSpot->getCovVertex();
75 m_posVec(0) = vertexVector.X();
76 m_posVec(1) = vertexVector.Y();
77 m_covariance(0, 0) = covVertex(0, 0);
78 m_covariance(1, 1) = covVertex(1, 1);
79 m_covariance(1, 0) = covVertex(1, 0);
80
81 } else if (!m_isBeamSpot && m_constraintDimension == 3) {
82
83 if (!(m_customOriginVertex.size() == 3) || !(m_customOriginCovariance.size() == 9)) {
84 B2FATAL("Incorrect dimension of customOriginVertex or customOriginCovariance. customOriginVertex dim = "
85 << m_customOriginVertex.size() << " customOriginCovariance dim = " << m_customOriginCovariance.size());
86 } else if ((m_customOriginCovariance.at(0) < 0) || (m_customOriginCovariance.at(4) < 0) || (m_customOriginCovariance.at(8) < 0)) {
87 B2WARNING("An element of customOriginCovariance diagonal is smaller than 0.");
88 return ErrCode(ErrCode::Status::badsetup);
89 }
90 m_posVec(0) = m_customOriginVertex[0];
91 m_posVec(1) = m_customOriginVertex[1];
92 m_posVec(2) = m_customOriginVertex[2];
93 m_covariance(0, 0) = m_customOriginCovariance[0];
94 m_covariance(0, 1) = m_customOriginCovariance[1];
95 m_covariance(1, 0) = m_customOriginCovariance[3];
96 m_covariance(1, 1) = m_customOriginCovariance[4];
97
98 // all with z
99 m_covariance(1, 2) = m_inflationFactorCovZ * m_customOriginCovariance[5];
100 m_covariance(2, 0) = m_inflationFactorCovZ * m_customOriginCovariance[6];
101 m_covariance(2, 1) = m_inflationFactorCovZ * m_customOriginCovariance[7];
102 m_covariance(2, 2) = m_inflationFactorCovZ * m_customOriginCovariance[8];
103 m_covariance(0, 2) = m_inflationFactorCovZ * m_customOriginCovariance[2];
104 } else {
105 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.");
106 }
107
108 return ErrCode(ErrCode::Status::success);
109 }

◆ initParticleWithMother()

ErrCode initParticleWithMother ( FitParams & fitparams)
overridevirtual

init particle, used if it has a mother

Implements ParticleBase.

Definition at line 36 of file Origin.cc.

37 {
38 return ErrCode(ErrCode::Status::success);
39 }

◆ initTau()

ErrCode initTau ( FitParams & par) const
protectedinherited

initialises tau as a length

Definition at line 435 of file ParticleBase.cc.

436 {
437 const int tauindex = tauIndex();
438 if (tauindex >= 0 && hasPosition()) {
439
440 const int posindex = posIndex();
441 const int mother_ps_index = mother()->posIndex();
442 const int dim = m_config->m_originDimension; // TODO can we configure this to be particle specific?
443
444 // tau has different meaning depending on the dimension of the constraint
445 // 2-> use x-y projection
446 const Eigen::Matrix < double, 1, -1, 1, 1, 3 > vertex_dist =
447 fitparams.getStateVector().segment(posindex, dim) - fitparams.getStateVector().segment(mother_ps_index, dim);
448 const Eigen::Matrix < double, 1, -1, 1, 1, 3 >
449 mom = fitparams.getStateVector().segment(posindex, dim);
450
451 // if an intermediate vertex is not well defined by a track or so it will be initialised with 0
452 // same for the momentum of for example B0, it might be initialised with 0
453 // in those cases use pdg value
454 const double mom_norm = mom.norm();
455 const double dot = std::abs(vertex_dist.dot(mom));
456 const double tau = dot / mom_norm;
457 if (0 == mom_norm || 0 == dot) {
458 const double mass = m_particle->getPDGMass();
459 if (mass > 0)
460 fitparams.getStateVector()(tauindex) = m_particle->getPDGLifetime() * 1e9 * Belle2::Const::speedOfLight / mass;
461 else
462 fitparams.getStateVector()(tauindex) = 0;
463 } else {
464 fitparams.getStateVector()(tauindex) = tau;
465 }
466 }
467
468 return ErrCode(ErrCode::Status::success);
469 }
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 66 of file Origin.h.

66{ return -1; }

◆ mother()

const ParticleBase * mother ( ) const
inlineinherited

getMother() / hasMother()

Definition at line 98 of file ParticleBase.h.

98{ return m_mother; };

◆ name()

virtual std::string name ( ) const
inlinevirtual

get name

Definition at line 75 of file Origin.h.

75{ 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 92 of file ParticleBase.h.

92{ return m_particle ; }

◆ posIndex()

virtual int posIndex ( ) const
inlineoverridevirtual

vertex position index in the statevector

Reimplemented from ParticleBase.

Definition at line 63 of file Origin.h.

63{ return index(); }

◆ projectConstraint()

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

the abstract projection

Reimplemented from ParticleBase.

Definition at line 143 of file Origin.cc.

144 {
145 ErrCode status;
146 switch (type) {
147 case Constraint::origin:
148 status |= projectOriginConstraint(fitparams, p);
149 break;
150 default:
151 status |= ParticleBase::projectConstraint(type, fitparams, p);
152 }
153 return status;
154 }

◆ 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::Matrix < double, 1, -1, 1, 1, 3 > x_vec = fitparams.getStateVector().segment(posindex, dim);
259 Eigen::Matrix < double, 1, -1, 1, 1, 3 > x_m = fitparams.getStateVector().segment(posindexmother, dim);
260 Eigen::Matrix < double, 1, -1, 1, 1, 3 > 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 for (int row = 0; row < dim; ++row) {
295
296 double posxmother = x_m(row);
297 double posx = x_vec(row);
298 double momx = p_vec(row);
299
303 p.getResiduals()(row) = posxmother + tau * momx / mom - posx ;
304 p.getH()(row, posindexmother + row) = 1;
305 p.getH()(row, posindex + row) = -1;
306 p.getH()(row, tauindex) = momx / mom;
307 }
308
309 return ErrCode(ErrCode::Status::success);
310 }

◆ projectMassConstraint()

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

project mass constraint abstract

Definition at line 414 of file ParticleBase.cc.

416 {
417 assert(m_config);
418 if (m_config->m_massConstraintType == 0) {
419 return projectMassConstraintParticle(fitparams, p);
420 } else {
421 return projectMassConstraintDaughters(fitparams, p);
422 }
423 }

◆ 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 312 of file ParticleBase.cc.

314 {
315 double mass = 0;
316 if (particle()->hasExtraInfo("treeFitterMassConstraintValue")) {
317 mass = particle()->getExtraInfo("treeFitterMassConstraintValue");
318 } else mass = particle()->getPDGMass();
319 const double mass2 = mass * mass;
320 double px = 0;
321 double py = 0;
322 double pz = 0;
323 double E = 0;
324
325 // the parameters of the daughters must be used otherwise the mass constraint does not have an effect on the extracted daughter momenta
326 for (const auto* daughter : m_daughters) {
327 const int momindex = daughter->momIndex();
328 // in most cases the daughters will be final states so we cache the value to use it in the energy column
329 const double px_daughter = fitparams.getStateVector()(momindex);
330 const double py_daughter = fitparams.getStateVector()(momindex + 1);
331 const double pz_daughter = fitparams.getStateVector()(momindex + 2);
332
333 px += px_daughter;
334 py += py_daughter;
335 pz += pz_daughter;
336 if (daughter->hasEnergy()) {
337 E += fitparams.getStateVector()(momindex + 3);
338 } else {
339 // final states dont have an energy index
340 double m = 0;
341 if (daughter->particle()->hasExtraInfo("treeFitterMassConstraintValue")) {
342 m = daughter->particle()->getExtraInfo("treeFitterMassConstraintValue");
343 } else m = daughter->particle()->getPDGMass();
344 E += std::sqrt(m * m + px_daughter * px_daughter + py_daughter * py_daughter + pz_daughter * pz_daughter);
345 }
346 }
347
351 p.getResiduals()(0) = mass2 - E * E + px * px + py * py + pz * pz;
352
353 for (const auto* daughter : m_daughters) {
354 //dr/dx = d/dx m2-{E1+E2+...}^2+{p1+p2+...}^2 = 2*x (x= E or p)
355 const int momindex = daughter->momIndex();
356 p.getH()(0, momindex) = 2.0 * px;
357 p.getH()(0, momindex + 1) = 2.0 * py;
358 p.getH()(0, momindex + 2) = 2.0 * pz;
359
360 if (daughter->hasEnergy()) {
361 p.getH()(0, momindex + 3) = -2.0 * E;
362 } else {
363 const double px_daughter = fitparams.getStateVector()(momindex);
364 const double py_daughter = fitparams.getStateVector()(momindex + 1);
365 const double pz_daughter = fitparams.getStateVector()(momindex + 2);
366 double m = 0;
367 if (daughter->particle()->hasExtraInfo("treeFitterMassConstraintValue")) {
368 m = daughter->particle()->getExtraInfo("treeFitterMassConstraintValue");
369 } else m = daughter->particle()->getPDGMass();
370
371 const double E_daughter = std::sqrt(m * m + px_daughter * px_daughter + py_daughter * py_daughter + pz_daughter * pz_daughter);
372 const double E_by_E_daughter = E / E_daughter;
373 p.getH()(0, momindex) -= 2.0 * E_by_E_daughter * px_daughter;
374 p.getH()(0, momindex + 1) -= 2.0 * E_by_E_daughter * py_daughter;
375 p.getH()(0, momindex + 2) -= 2.0 * E_by_E_daughter * pz_daughter;
376 }
377
378 }
379 return ErrCode(ErrCode::Status::success);
380 }
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 382 of file ParticleBase.cc.

384 {
385 double mass = 0;
386 if (particle()->hasExtraInfo("treeFitterMassConstraintValue")) mass = particle()->getExtraInfo("treeFitterMassConstraintValue");
387 else mass = particle()->getPDGMass();
388 const double mass2 = mass * mass;
389 const int momindex = momIndex();
390 const double px = fitparams.getStateVector()(momindex);
391 const double py = fitparams.getStateVector()(momindex + 1);
392 const double pz = fitparams.getStateVector()(momindex + 2);
393 const double E = fitparams.getStateVector()(momindex + 3);
394
398 p.getResiduals()(0) = mass2 - E * E + px * px + py * py + pz * pz;
399
400 p.getH()(0, momindex) = 2.0 * px;
401 p.getH()(0, momindex + 1) = 2.0 * py;
402 p.getH()(0, momindex + 2) = 2.0 * pz;
403 p.getH()(0, momindex + 3) = -2.0 * E;
404
405 // TODO 0 in most cases -> needs special treatment if width=0 to not crash chi2 calculation
406 // const double width = TDatabasePDG::Instance()->GetParticle(particle()->getPDGCode())->Width();
407 // transport measurement uncertainty into residual system
408 // f' = sigma_x^2 * (df/dx)^2
409 // p.getV()(0) = width * width * 4 * mass2;
410
411 return ErrCode(ErrCode::Status::success);
412 }

◆ projectOriginConstraint()

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

the actual constraint projection

Definition at line 124 of file Origin.cc.

125 {
126 const int posindex = posIndex();
127
128 p.getResiduals().segment(0, m_constraintDimension) =
129 m_posVec.segment(0, m_constraintDimension) -
130 fitparams.getStateVector().segment(posindex, m_constraintDimension);
131
132 for (int row = 0; row < m_constraintDimension; ++row) {
133 p.getH()(row, posindex + row) = -1;
134
135 for (int col = 0; col <= row; ++col) {
136 p.getV()(row, col) = m_covariance(row, col);
137 }
138 }
139
140 return ErrCode(ErrCode::Status::success);
141 }

◆ 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 189 of file ParticleBase.h.

189{ m_index = i ; }

◆ setMother()

void setMother ( const ParticleBase * m)
inlineinherited

set mother

Definition at line 164 of file ParticleBase.h.

164{ 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 69 of file Origin.h.

69{ return -1; }

◆ type()

virtual int type ( ) const
inlineoverridevirtual

get particle type

Implements ParticleBase.

Definition at line 51 of file Origin.h.

51{ 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 100 of file Origin.h.

◆ m_config

const ConstraintConfiguration* m_config
protectedinherited

has all the constraint config

Definition at line 204 of file ParticleBase.h.

◆ m_constraintDimension

const int m_constraintDimension
private

dimension of the constraint

Definition at line 80 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 94 of file Origin.h.

◆ m_customOriginCovariance

const std::vector<double> m_customOriginCovariance
private

vertex covariance

Definition at line 86 of file Origin.h.

◆ m_customOriginVertex

const std::vector<double> m_customOriginVertex
private

vertex coordinates

Definition at line 83 of file Origin.h.

◆ m_daughters

std::vector<ParticleBase*> m_daughters
protectedinherited

daughter container

Definition at line 198 of file ParticleBase.h.

◆ m_index

int m_index
privateinherited

index

Definition at line 208 of file ParticleBase.h.

◆ m_inflationFactorCovZ

const int m_inflationFactorCovZ
private

inflated the covariance matrix in z by this number

Definition at line 103 of file Origin.h.

◆ m_isBeamSpot

const bool m_isBeamSpot
private

is this the beam constraint?

Definition at line 97 of file Origin.h.

◆ m_isStronglyDecayingResonance

bool m_isStronglyDecayingResonance
protectedinherited

decay length less than 1 micron

Definition at line 201 of file ParticleBase.h.

◆ m_mother

const ParticleBase* m_mother
protectedinherited

motherparticle

Definition at line 195 of file ParticleBase.h.

◆ m_name

std::string m_name
privateinherited

name

Definition at line 211 of file ParticleBase.h.

◆ m_particle

Belle2::Particle* m_particle
protectedinherited

pointer to framework type

Definition at line 192 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 89 of file Origin.h.

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