Belle II Software  release-08-01-10
Origin Class Reference

representation of the beamspot as a particle More...

#include <Origin.h>

Inheritance diagram for Origin:
Collaboration diagram for Origin:

Public Types

enum  TFParticleType {
  kInteractionPoint ,
  kOrigin ,
  kComposite ,
  kRecoResonance ,
  kInternalParticle ,
  kRecoTrack ,
  kResonance ,
  kRecoPhoton ,
  kRecoKlong ,
  kMissingParticle
}
 particle types

 
typedef std::vector< Constraintconstraintlist
 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. More...
 
virtual int tauIndex () const override
 the lifetime index. More...
 
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. More...
 
virtual std::string parname (int index) const
 get name of parameter i
 
const ParticleBaselocate (Belle2::Particle *particle) const
 get particle base from basf2 particle
 
Belle2::Particleparticle () const
 get basf2 particle

 
int index () const
 get index

 
const ParticleBasemother () const
 getMother() / hasMother()
 
virtual ErrCode projectGeoConstraint (const FitParams &, Projection &) const
 project geometrical constraint More...
 
virtual ErrCode projectMassConstraintParticle (const FitParams &, Projection &) const
 project mass constraint using the particles parameters More...
 
virtual ErrCode projectMassConstraintDaughters (const FitParams &, Projection &) const
 project mass constraint using the parameters of the daughters More...
 
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 ParticleBaseaddDaughter (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 ParticleBasecreateParticle (Belle2::Particle *particle, const ParticleBase *mother, const ConstraintConfiguration &config, bool forceFitAll=false)
 create the according treeFitter particle obj for a basf2 particle type

 
static ParticleBasecreateOrigin (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. More...
 

Protected Attributes

Belle2::Particlem_particle
 pointer to framework type

 
const ParticleBasem_mother
 motherparticle
 
std::vector< ParticleBase * > m_daughters
 daughter container

 
bool m_isStronglyDecayingResonance
 decay length less than 1 micron

 
const ConstraintConfigurationm_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::BeamSpotm_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 Function Documentation

◆ 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 134 of file ParticleBase.cc.

◆ 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; }

◆ 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 249 of file ParticleBase.cc.

◆ 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 314 of file ParticleBase.cc.

◆ 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.

◆ 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.

◆ updateIndex()

void updateIndex ( int &  offset)
virtualinherited

this sets the index for momentum, position, etc.

in the statevector

Definition at line 84 of file ParticleBase.cc.


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