CMS 3D CMS Logo
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Properties Friends Macros Pages
List of all members | Public Types | Public Member Functions | Private Attributes
ColinearityKinematicConstraint Class Reference

#include <ColinearityKinematicConstraint.h>

Inheritance diagram for ColinearityKinematicConstraint:
MultiTrackKinematicConstraint

Public Types

enum  ConstraintDim { Phi, PhiTheta }
 

Public Member Functions

virtual
ColinearityKinematicConstraint * 		clone () const
 
 ColinearityKinematicConstraint (ConstraintDim dim=Phi)
 
virtual int numberOfEquations () const
 
virtual AlgebraicMatrix parametersDerivative (const std::vector< KinematicState > &states, const GlobalPoint &point) const
 
virtual AlgebraicMatrix positionDerivative (const std::vector< KinematicState > &states, const GlobalPoint &point) const
 
virtual AlgebraicVector value (const std::vector< KinematicState > &states, const GlobalPoint &point) const
 
- Public Member Functions inherited from MultiTrackKinematicConstraint
 MultiTrackKinematicConstraint ()
 
virtual ~MultiTrackKinematicConstraint ()
 

Private Attributes

ConstraintDim dimension
 
unsigned int size
 

Detailed Description

Consstraint to force the two tracks to be colinear (parallel), in 2D (phi) or 3D (phi-theta).

Warning: Since this constraint makes only sense with two tracks, two and only two tracks should be used in the fit.

Definition at line 16 of file ColinearityKinematicConstraint.h.

Member Enumeration Documentation

enum ColinearityKinematicConstraint::ConstraintDim
Enumerator
Phi 
PhiTheta 

Definition at line 20 of file ColinearityKinematicConstraint.h.

20 {Phi, PhiTheta};

Constructor & Destructor Documentation

ColinearityKinematicConstraint::ColinearityKinematicConstraint ( ConstraintDim  dim = Phi)

Definition at line 4 of file ColinearityKinematicConstraint.cc.

References dimension, Phi, and size.

Referenced by clone().

5 {
6  dimension = dim;
7  if (dimension == Phi) size = 1;
8  else size = 2;
9 }

Member Function Documentation

virtual ColinearityKinematicConstraint* ColinearityKinematicConstraint::clone ( void  ) const
inlinevirtual

Implements MultiTrackKinematicConstraint.

Definition at line 55 of file ColinearityKinematicConstraint.h.

References ColinearityKinematicConstraint().

56  {return new ColinearityKinematicConstraint(*this);}
ColinearityKinematicConstraint::ColinearityKinematicConstraint
ColinearityKinematicConstraint(ConstraintDim dim=Phi)
Definition: ColinearityKinematicConstraint.cc:4
virtual int ColinearityKinematicConstraint::numberOfEquations ( ) const
inlinevirtual

Number of equations per track used for the fit

Implements MultiTrackKinematicConstraint.

Definition at line 53 of file ColinearityKinematicConstraint.h.

References size.

53 {return size;}
AlgebraicMatrix ColinearityKinematicConstraint::parametersDerivative ( const std::vector< KinematicState > &  states,
const GlobalPoint &  point 
) const
virtual

Returns a matrix of derivatives of constraint equations w.r.t. particle parameters

Implements MultiTrackKinematicConstraint.

Definition at line 47 of file ColinearityKinematicConstraint.cc.

References dimension, relval_steps::k2, p1, p2, PhiTheta, size, mathSSE::sqrt(), PV3DBase< T, PVType, FrameType >::x(), and PV3DBase< T, PVType, FrameType >::y().

49 {
50  int n_st = states.size();
51  if(n_st<2) throw VertexException("ColinearityKinematicConstraint::<2 states passed");
52  AlgebraicMatrix res(size,n_st*7,0);
53 
54  double a_1 = -states[0].particleCharge()*states[0].magneticField()->inInverseGeV(states[0].globalPosition()).z();
55  double a_2 = -states[1].particleCharge()*states[1].magneticField()->inInverseGeV(states[1].globalPosition()).z();
56 
57  AlgebraicVector7 p1 = states[0].kinematicParameters().vector();
58  AlgebraicVector7 p2 = states[1].kinematicParameters().vector();
59 
60  double p1vx = p1(3) - a_1*(point.y() - p1(1));
61  double p1vy = p1(4) + a_1*(point.x() - p1(0));
62  double k1 = 1.0/(p1vx*p1vx + p1vy*p1vy);
63  double pt1 = sqrt(p1(3)*p1(3)+p1(4)*p1(4));
64  double pTot1 = sqrt(p1(3)*p1(3)+p1(4)*p1(4)+p1(5)*p1(5));
65 
66  double p2vx = p2(3) - a_2*(point.y() - p2(1));
67  double p2vy = p2(4) + a_2*(point.x() - p2(0));
68  double k2 = 1.0/(p2vx*p2vx + p2vy*p2vy);
69  double pt2 = sqrt(p2(3)*p2(3)+p2(4)*p2(4));
70  double pTot2 = sqrt(p2(3)*p2(3)+p2(4)*p2(4)+p2(5)*p2(5));
71 
72  // H_phi:
73 
74  //x1 and x2 derivatives: 1st and 8th elements
75  res(1,1) = -k1*a_1*p1vx;
76  res(1,8) = k2*a_2*p2vx;
77 
78  //y1 and y2 derivatives: 2nd and 9th elements:
79  res(1,2) = -k1*a_1*p1vy;
80  res(1,9) = k2*a_2*p2vy;
81 
82  //z1 and z2 components: 3d and 10th elmnets stay 0:
83  res(1,3) = 0.; res(1,10) = 0.;
84 
85  //px1 and px2 components: 4th and 11th elements:
86  res(1,4) = -k1*p1vy;
87  res(1,11) = k2*p2vy;
88 
89  //py1 and py2 components: 5th and 12 elements:
90  res(1,5) = k1*p1vx;
91  res(1,12) = -k2*p2vx;
92 
93 
94  //pz1 and pz2 components: 6th and 13 elements:
95  res(1,6) = 0.; res(1,13) = 0.;
96  //mass components: 7th and 14th elements:
97  res(1,7) = 0.; res(1,14) = 0.;
98 
99  if (dimension == PhiTheta) {
100  // H_theta:
101  //x1 and x2 derivatives: 1st and 8th elements
102  res(2,1) = 0.; res(2,8) = 0.;
103 
104  //y1 and y2 derivatives: 2nd and 9th elements:
105  res(2,2) = 0.; res(2,9) = 0.;
106 
107  //z1 and z2 components: 3d and 10th elmnets stay 0:
108  res(2,3) = 0.; res(2,10) = 0.;
109 
110  res(2,4) = p1(5)*p1(3) / (pTot1*pTot1*pt1);
111  res(2,11) = - p2(5)*p2(3) / (pTot2*pTot2*pt2);
112 
113  //py1 and py2 components: 5th and 12 elements:
114  res(2,5) = p1(5)*p1(4) / (pTot1*pTot1*pt1);
115  res(2,12) = - p2(5)*p2(4) / (pTot2*pTot2*pt2);
116 
117  //pz1 and pz2 components: 6th and 13 elements:
118  res(2,6) = - pt1/(pTot1*pTot1);
119  res(2,13) = pt2/(pTot2*pTot2);
120  //mass components: 7th and 14th elements:
121  res(2,7) = 0.; res(2,14) = 0.;
122  }
123 
124  return res;
125 }
relval_steps.k2
k2
Definition: relval_steps.py:1524
VertexException
Common base class.
Definition: VertexException.h:12
PV3DBase::y
T y() const
Definition: PV3DBase.h:63
AlgebraicVector7
ROOT::Math::SVector< double, 7 > AlgebraicVector7
Definition: Matrices.h:8
AlgebraicMatrix
CLHEP::HepMatrix AlgebraicMatrix
Definition: AlgebraicObjects.h:13
mathSSE::sqrt
T sqrt(T t)
Definition: SSEVec.h:18
p2
double p2[4]
Definition: TauolaWrapper.h:90
p1
double p1[4]
Definition: TauolaWrapper.h:89
PV3DBase::x
T x() const
Definition: PV3DBase.h:62
AlgebraicMatrix ColinearityKinematicConstraint::positionDerivative ( const std::vector< KinematicState > &  states,
const GlobalPoint &  point 
) const
virtual

Returns a matrix of derivatives of constraint equations w.r.t. vertex position

Implements MultiTrackKinematicConstraint.

Definition at line 127 of file ColinearityKinematicConstraint.cc.

References dimension, relval_steps::k2, p1, p2, PhiTheta, size, PV3DBase< T, PVType, FrameType >::x(), and PV3DBase< T, PVType, FrameType >::y().

129 {
130  AlgebraicMatrix res(size,3,0);
131  if(states.size()<2) throw VertexException("ColinearityKinematicConstraint::<2 states passed");
132 
133  double a_1 = -states[0].particleCharge() * states[0].magneticField()->inInverseGeV(states[0].globalPosition()).z();
134  double a_2 = -states[1].particleCharge() * states[1].magneticField()->inInverseGeV(states[1].globalPosition()).z();
135 
136  AlgebraicVector7 p1 = states[0].kinematicParameters().vector();
137  AlgebraicVector7 p2 = states[1].kinematicParameters().vector();
138 
139  double p1vx = p1(3) - a_1*(point.y() - p1(1));
140  double p1vy = p1(4) + a_1*(point.x() - p1(0));
141  double k1 = 1.0/(p1vx*p1vx + p1vy*p1vy);
142  //double pt1 = sqrt(p1(3)*p1(3)+p1(4)*p1(4));
143 
144  double p2vx = p2(3) - a_2*(point.y() - p2(1));
145  double p2vy = p2(4) + a_2*(point.x() - p2(0));
146  double k2 = 1.0/(p2vx*p2vx + p2vy*p2vy);
147  //double pt2 = sqrt(p2(3)*p2(3)+p2(4)*p2(4));
148 
149  // H_phi:
150 
151  // xv component
152  res(1,1) = k1*a_1*p1vx - k2*a_2*p2vx;
153 
154  //yv component
155  res(1,2) = k1*a_1*p1vy - k2*a_2*p2vy;
156 
157  //zv component
158  res(1,3) = 0.;
159 
160  // H_theta: no correlation with vertex position
161  if (dimension == PhiTheta) {
162  res(2,1) = 0.;
163  res(2,2) = 0.;
164  res(2,3) = 0.;
165  }
166 
167  return res;
168 }
relval_steps.k2
k2
Definition: relval_steps.py:1524
VertexException
Common base class.
Definition: VertexException.h:12
PV3DBase::y
T y() const
Definition: PV3DBase.h:63
AlgebraicVector7
ROOT::Math::SVector< double, 7 > AlgebraicVector7
Definition: Matrices.h:8
AlgebraicMatrix
CLHEP::HepMatrix AlgebraicMatrix
Definition: AlgebraicObjects.h:13
p2
double p2[4]
Definition: TauolaWrapper.h:90
p1
double p1[4]
Definition: TauolaWrapper.h:89
PV3DBase::x
T x() const
Definition: PV3DBase.h:62
AlgebraicVector ColinearityKinematicConstraint::value ( const std::vector< KinematicState > &  states,
const GlobalPoint &  point 
) const
virtual

Returns a vector of values of constraint equations at the point where the input particles are defined.

Implements MultiTrackKinematicConstraint.

Definition at line 11 of file ColinearityKinematicConstraint.cc.

References dimension, M_PI, p1, p2, PhiTheta, size, mathSSE::sqrt(), PV3DBase< T, PVType, FrameType >::x(), and PV3DBase< T, PVType, FrameType >::y().

13 {
14  if(states.size()<2) throw VertexException("ColinearityKinematicConstraint::<2 states passed");
15  AlgebraicVector res(size,0);
16 
17  double a_1 = -states[0].particleCharge()*states[0].magneticField()->inInverseGeV(states[0].globalPosition()).z();
18  double a_2 = -states[1].particleCharge()*states[1].magneticField()->inInverseGeV(states[1].globalPosition()).z();
19 
20  AlgebraicVector7 p1 = states[0].kinematicParameters().vector();
21  AlgebraicVector7 p2 = states[1].kinematicParameters().vector();
22 
23  double p1vx = p1(3) - a_1*(point.y() - p1(1));
24  double p1vy = p1(4) + a_1*(point.x() - p1(0));
25  double pt1 = sqrt(p1(3)*p1(3)+p1(4)*p1(4));
26 
27  double p2vx = p2(3) - a_2*(point.y() - p2(1));
28  double p2vy = p2(4) + a_2*(point.x() - p2(0));
29  double pt2 = sqrt(p2(3)*p2(3)+p2(4)*p2(4));
30 
31  // H_phi:
32  res(1) = atan2(p1vy,p1vx) - atan2(p2vy,p2vx);
33  if ( res(1) > M_PI ) res(1) -= 2.0*M_PI;
34  if ( res(1) <= -M_PI ) res(1) += 2.0*M_PI;
35  // H_theta:
36  if (dimension == PhiTheta) {
37  res(2) = atan2(pt1,p1(5)) - atan2(pt2,p2(5));
38  if ( res(2) > M_PI ) res(2) -= 2.0*M_PI;
39  if ( res(2) <= -M_PI ) res(2) += 2.0*M_PI;
40  }
41 
42 // cout << res(1) << " "<<res(2) << "\n ";// res(2)
43 
44  return res;
45 }
VertexException
Common base class.
Definition: VertexException.h:12
PV3DBase::y
T y() const
Definition: PV3DBase.h:63
AlgebraicVector7
ROOT::Math::SVector< double, 7 > AlgebraicVector7
Definition: Matrices.h:8
mathSSE::sqrt
T sqrt(T t)
Definition: SSEVec.h:18
p2
double p2[4]
Definition: TauolaWrapper.h:90
M_PI
#define M_PI
Definition: BXVectorInputProducer.cc:51
AlgebraicVector
CLHEP::HepVector AlgebraicVector
Definition: AlgebraicObjects.h:12
p1
double p1[4]
Definition: TauolaWrapper.h:89
PV3DBase::x
T x() const
Definition: PV3DBase.h:62

Member Data Documentation

ConstraintDim ColinearityKinematicConstraint::dimension
private

Definition at line 59 of file ColinearityKinematicConstraint.h.

Referenced by ColinearityKinematicConstraint(), parametersDerivative(), positionDerivative(), and value().

unsigned int ColinearityKinematicConstraint::size
private

Definition at line 60 of file ColinearityKinematicConstraint.h.

Referenced by cuy.FindIssue::__init__(), ColinearityKinematicConstraint(), numberOfEquations(), parametersDerivative(), positionDerivative(), and value().

Generated for CMSSW Reference Manual by doxygen 1.8.5