BackToBackKinematicConstraint Class Reference

#include <BackToBackKinematicConstraint.h>

Inheritance diagram for BackToBackKinematicConstraint:

Public Member Functions
	BackToBackKinematicConstraint ()
KinematicConstraint *	clone () const override
std::pair< AlgebraicMatrix, AlgebraicVector >	derivative (const AlgebraicVector &exPoint) const override
std::pair< AlgebraicMatrix, AlgebraicVector >	derivative (const std::vector< RefCountedKinematicParticle > &par) const override
AlgebraicVector	deviations (int nStates) const override
int	numberOfEquations () const override
std::pair< AlgebraicVector, AlgebraicVector >	value (const AlgebraicVector &exPoint) const override
std::pair< AlgebraicVector, AlgebraicVector >	value (const std::vector< RefCountedKinematicParticle > &par) const override
	~BackToBackKinematicConstraint () override
Public Member Functions inherited from KinematicConstraint
	KinematicConstraint ()
virtual	~KinematicConstraint ()

Detailed Description

Class implementing the back-to-back geometry constraints for 2 KinematicParticles. Current version does not implement an actual back-to-back. Current class forces 2 tracks to have the opposite direction, bud does not force them to emerge from the single point. Coorect version to be implemented later.

This is just an illustrative piece of code, showing possible approach to constraint application on multiple tracks.

Kirill Prokofiev, July 2004

Definition at line 21 of file BackToBackKinematicConstraint.h.

Constructor & Destructor Documentation

BackToBackKinematicConstraint()

BackToBackKinematicConstraint::BackToBackKinematicConstraint ( )

inline

Definition at line 23 of file BackToBackKinematicConstraint.h.

{}

Referenced by clone().

~BackToBackKinematicConstraint()

BackToBackKinematicConstraint::~BackToBackKinematicConstraint ( )

inlineoverride

Definition at line 25 of file BackToBackKinematicConstraint.h.

{}

Member Function Documentation

clone()

KinematicConstraint * BackToBackKinematicConstraint::clone ( ) const

overridevirtual

Clone method

Implements KinematicConstraint.

Definition at line 89 of file BackToBackKinematicConstraint.cc.

{ return new BackToBackKinematicConstraint(*this); }

References BackToBackKinematicConstraint().

derivative() [1/2]

std::pair< AlgebraicMatrix, AlgebraicVector > BackToBackKinematicConstraint::derivative ( const AlgebraicVector &  exPoint ) const

overridevirtual

Implements KinematicConstraint.

Definition at line 20 of file BackToBackKinematicConstraint.cc.

                                          {
  //security check for extended cartesian parametrization
  int inSize = exPoint.num_row();
  if (inSize != 14)
    throw VertexException("BackToBackKinematicConstraint::linearization point has a wrong dimension");
  AlgebraicVector pr = exPoint;
 
  //number of states should be always equal to 2 for such a constraint
  AlgebraicMatrix dr(3, 14, 0);
  dr(1, 4) = 1.;
  dr(1, 11) = 1.;
  dr(2, 5) = 1;
  dr(2, 12) = 1;
  dr(3, 6) = 1;
  dr(3, 13) = 1;
  return std::pair<AlgebraicMatrix, AlgebraicVector>(dr, pr);
}

References flavorHistoryFilter_cfi::dr.

derivative() [2/2]

std::pair< AlgebraicMatrix, AlgebraicVector > BackToBackKinematicConstraint::derivative ( const std::vector< RefCountedKinematicParticle > &  par ) const

overridevirtual

Implements KinematicConstraint.

Definition at line 63 of file BackToBackKinematicConstraint.cc.

                                                             {
  int nStates = par.size();
  if (nStates != 2)
    throw VertexException("BackToBackKinematicConstraint::number of tracks is not equal to 2");
  AlgebraicVector point(14, 0);
  int co = 0;
  for (std::vector<RefCountedKinematicParticle>::const_iterator i = par.begin(); i != par.end(); i++) {
    AlgebraicVector7 cPar = (*i)->currentState().kinematicParameters().vector();
    for (int j = 1; j < 8; j++) {
      point((co - 1) * 7 + j) = cPar(j - 1);
    }
    co++;
  }
  AlgebraicMatrix dr(3, 14, 0);
 
  return std::pair<AlgebraicMatrix, AlgebraicVector>(dr, point);
}

References cms::cuda::co, flavorHistoryFilter_cfi::dr, mps_fire::i, dqmiolumiharvest::j, and point.

deviations()

AlgebraicVector BackToBackKinematicConstraint::deviations ( int  nStates ) const

overridevirtual

Returns vector of sigma squared associated to the KinematicParameters of refitted particles Initial deviations are given by user for the constraining parameters (mass, momentum components etc). In case of multiple states exactly the same values are added to every particle parameters

Implements KinematicConstraint.

Definition at line 82 of file BackToBackKinematicConstraint.cc.

                                                                           {
  AlgebraicVector dd(7 * nStates, 0);
  return dd;
}

References createTree::dd.

numberOfEquations()

int BackToBackKinematicConstraint::numberOfEquations ( ) const

overridevirtual

Returns an actual number of equations in particular constraint (corresponds to the number of strings in constraint derivative matrix, for example)

Implements KinematicConstraint.

Definition at line 87 of file BackToBackKinematicConstraint.cc.

{ return 3; }

value() [1/2]

std::pair< AlgebraicVector, AlgebraicVector > BackToBackKinematicConstraint::value ( const AlgebraicVector &  exPoint ) const

overridevirtual

Derivatives and value calculated at given expansion point Vector should always be of size 14 (2 particles)

Implements KinematicConstraint.

Definition at line 5 of file BackToBackKinematicConstraint.cc.

                                                                                                                   {
  //security check for extended cartesian parametrization
  int inSize = exPoint.num_row();
  if (inSize != 14)
    throw VertexException("BackToBackKinematicConstraint::linearization point has a wrong dimension");
  AlgebraicVector pr = exPoint;
 
  //number of states should be always equal to 2 for such a constraint
  AlgebraicVector vl(3, 0);
  vl(1) = pr(4) + pr(11);
  vl(2) = pr(5) + pr(12);
  vl(3) = pr(6) + pr(13);
  return std::pair<AlgebraicVector, AlgebraicVector>(vl, pr);
}

value() [2/2]

std::pair< AlgebraicVector, AlgebraicVector > BackToBackKinematicConstraint::value ( const std::vector< RefCountedKinematicParticle > &  par ) const

overridevirtual

Derivatives and values calculated at expansion point, taken at current state of input particles. Number of input particles should be always equal to 2

Implements KinematicConstraint.

Definition at line 39 of file BackToBackKinematicConstraint.cc.

                                                             {
  int nStates = par.size();
  if (nStates != 2)
    throw VertexException("BackToBackKinematicConstraint::number of tracks is not equal to 2");
  AlgebraicVector point(14, 0);
  int co = 0;
  for (std::vector<RefCountedKinematicParticle>::const_iterator i = par.begin(); i != par.end(); i++) {
    AlgebraicVector7 cPar = (*i)->currentState().kinematicParameters().vector();
    for (int j = 1; j < 8; j++) {
      point((co - 1) * 7 + j) = cPar(j - 1);
    }
    co++;
  }
  AlgebraicVector vl(3, 0);
  AlgebraicVector st1 = asHepVector<7>(par[0]->currentState().kinematicParameters().vector());
  AlgebraicVector st2 = asHepVector<7>(par[1]->currentState().kinematicParameters().vector());
  vl(1) = st1(4) + st2(4);
  vl(2) = st1(5) + st2(5);
  vl(3) = st1(6) + st2(6);
 
  return std::pair<AlgebraicVector, AlgebraicVector>(vl, point);
}

References cms::cuda::co, mps_fire::i, dqmiolumiharvest::j, and point.