BOSS 6.6.4.p01
BESIII Offline Software System
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Public Member Functions | Public Attributes | Friends | List of all members
DifFourVector Class Reference

#include <DifFourVector.h>

Public Member Functions

 DifFourVector ()
 
 DifFourVector (const DifNumber &mass, const DifVector &p)
 
 DifFourVector (const double &mass, const DifVector &p)
 
 DifFourVector (const DifFourVector &v)
 
 ~DifFourVector ()
 
HepSymMatrix errorMatrix (const HepSymMatrix &e) const
 
HepMatrix jacobian () const
 
DifFourVector & operator+= (const DifFourVector &v)
 
DifFourVector & operator-= (const DifFourVector &v)
 
DifFourVector & operator= (const DifFourVector &v)
 
DifFourVector operator- () const
 
int nPar () const
 
DifVector direction () const
 
DifNumber pMag () const
 
DifNumber massSq () const
 
DifNumber mass () const
 
void print () const
 
DifFourVector & zeroDerivatives ()
 
void boostTo (const DifFourVector &)
 
void boostFrom (const DifFourVector &)
 
void boostToMe (std::vector< DifFourVector * > &listToBoost) const
 
void boostFromMe (std::vector< DifFourVector * > &listToBoost) const
 

Public Attributes

DifNumber E
 
DifVector P
 

Friends

DifFourVector operator+ (const DifFourVector &a, const DifFourVector &b)
 
DifFourVector operator- (const DifFourVector &a, const DifFourVector &b)
 
DifNumber operator* (const DifFourVector &a, const DifFourVector &b)
 

Detailed Description

Definition at line 34 of file DifFourVector.h.

Constructor & Destructor Documentation

◆ DifFourVector() [1/4]

DifFourVector::DifFourVector ( )

Definition at line 27 of file DifFourVector.cxx.

28 :E(0.0),P(0.0,0.0,0.0)
29{}

◆ DifFourVector() [2/4]

DifFourVector::DifFourVector ( const DifNumber &  mass,
const DifVector &  p 
)

Definition at line 31 of file DifFourVector.cxx.

33 :E(sqrt(m*m+p*p)),P(p)
34{}

◆ DifFourVector() [3/4]

DifFourVector::DifFourVector ( const double &  mass,
const DifVector &  p 
)

Definition at line 35 of file DifFourVector.cxx.

37 :E(sqrt(m*m+p*p)),P(p)
38{}

◆ DifFourVector() [4/4]

DifFourVector::DifFourVector ( const DifFourVector &  v)

Definition at line 40 of file DifFourVector.cxx.

41 :E(v.E),P(v.P)
42{}
v
**********Class see also m_nmax DOUBLE PRECISION m_amel DOUBLE PRECISION m_x2 DOUBLE PRECISION m_alfinv DOUBLE PRECISION m_Xenph INTEGER m_KeyWtm INTEGER m_idyfs DOUBLE PRECISION m_zini DOUBLE PRECISION m_q2 DOUBLE PRECISION m_Wt_KF DOUBLE PRECISION m_WtCut INTEGER m_KFfin *COMMON c_KarLud $ !Input CMS energy[GeV] $ !CMS energy after beam spread beam strahlung[GeV] $ !Beam energy spread[GeV] $ !z boost due to beam spread $ !electron beam mass *ff pair spectrum $ !minimum v
Definition: KarLud.h:35

◆ ~DifFourVector()

DifFourVector::~DifFourVector ( )
inline

Definition at line 48 of file DifFourVector.h.

48{} // destroy

Member Function Documentation

◆ boostFrom()

void DifFourVector::boostFrom ( const DifFourVector &  pFrom)

Definition at line 166 of file DifFourVector.cxx.

167{
168 const DifVector xHat(1,0,0);
169 const DifVector yHat(0,1,0);
170 const DifVector zHat(0,1,0);
171 DifVector z=pFrom.direction();
172 DifVector y=zHat-z*(zHat*z);
173 if(y.length()<0.01) y=xHat-z*(xHat*z);
174 y.normalize();
175 DifVector x(cross(y,z));
176
177 DifNumber px=P*x;
178 DifNumber py=P*y;
179 DifNumber pz=P*z;
180
181 DifNumber gamma=pFrom.E/pFrom.mass();
182 DifNumber beta=pFrom.pMag()/pFrom.E;
183
184 DifNumber pzP=gamma*(pz+beta*E);
185 DifNumber eP=gamma*(E+beta*pz);
186
187 E=eP;
188 P=px*x+py*y+pzP*z;
189}
x
Double_t x[10]
Definition: DataBase/tau_mode.c:57
cross
EvtVector3R cross(const EvtVector3R &p1, const EvtVector3R &p2)
Definition: EvtVector3R.cc:84
DifFourVector::mass
DifNumber mass() const
Definition: DifFourVector.h:77
DifFourVector::pMag
DifNumber pMag() const
Definition: DifFourVector.h:75
DifFourVector::direction
DifVector direction() const
DifVector::normalize
DifVector & normalize()
DifVector::length
DifNumber length() const

◆ boostFromMe()

void DifFourVector::boostFromMe ( std::vector< DifFourVector * > &  listToBoost) const

Definition at line 134 of file DifFourVector.cxx.

134 {
135 const DifVector xHat(1,0,0);
136 const DifVector yHat(0,1,0);
137 const DifVector zHat(0,0,1);
138 DifVector z=P;
139 z.normalize();
140 DifVector y(zHat-z*(zHat*z));
141 if(y.lengthSq()<0.0001) y=xHat-z*(xHat*z);
142 y.normalize();
143 DifVector x(cross(y,z));
144
145 DifNumber gamma=E/mass();
146 DifNumber beta=pMag()/E;
147
148 for(int i=0;i<(int)list.size();i++) {
149 DifFourVector& p4i=*list[i];
150 DifNumber px=p4i.P*x;
151 DifNumber py=p4i.P*y;
152 DifNumber pz=p4i.P*z;
153 DifNumber e=p4i.E;
154
155 DifNumber pzP=gamma*(pz+beta*e);
156 DifNumber eP=gamma*(e+beta*pz);
157
158 p4i.E=eP;
159 p4i.P=px*x+py*y+pzP*z;
160
161 }
162
163}

◆ boostTo()

void DifFourVector::boostTo ( const DifFourVector &  pTo)

Definition at line 72 of file DifFourVector.cxx.

73{
74 const DifVector xHat(1,0,0);
75 const DifVector yHat(0,1,0);
76 const DifVector zHat(0,1,0);
77 DifVector z=pTo.direction();
78 DifVector y=zHat-z*(zHat*z);
79 if(y.length()<0.01) y=xHat-z*(xHat*z);
80 y.normalize();
81 DifVector x(cross(y,z));
82
83 DifNumber px=P*x;
84 DifNumber py=P*y;
85 DifNumber pz=P*z;
86
87 DifNumber gamma=pTo.E/pTo.mass();
88 DifNumber beta=pTo.pMag()/pTo.E;
89
90 DifNumber pzP=gamma*(pz-beta*E);
91 DifNumber eP=gamma*(E-beta*pz);
92
93 E=eP;
94 P=px*x+py*y+pzP*z;
95
96 return;
97
98}

◆ boostToMe()

void DifFourVector::boostToMe ( std::vector< DifFourVector * > &  listToBoost) const

Definition at line 101 of file DifFourVector.cxx.

101 {
102 const DifVector xHat(1,0,0);
103 const DifVector yHat(0,1,0);
104 const DifVector zHat(0,0,1);
105 DifVector z=P;
106 z.normalize();
107 DifVector y(zHat-z*(zHat*z));
108 if(y.lengthSq()<0.0001) y=xHat-z*(xHat*z);
109 y.normalize();
110 DifVector x(cross(y,z));
111
112 DifNumber gamma=E/mass();
113 DifNumber beta=pMag()/E;
114
115 for(int i=0;i<(int)list.size();i++) {
116 DifFourVector& p4i=*list[i];
117 DifNumber px=p4i.P*x;
118 DifNumber py=p4i.P*y;
119 DifNumber pz=p4i.P*z;
120 DifNumber e=p4i.E;
121
122 DifNumber pzP=gamma*(pz-beta*e);
123 DifNumber eP=gamma*(e-beta*pz);
124
125 p4i.E=eP;
126 p4i.P=px*x+py*y+pzP*z;
127
128 }
129
130}

◆ direction()

DifVector DifFourVector::direction ( ) const
inline

Referenced by boostFrom(), and boostTo().

◆ errorMatrix()

HepSymMatrix DifFourVector::errorMatrix ( const HepSymMatrix &  e) const

Definition at line 44 of file DifFourVector.cxx.

44 {
45 HepSymMatrix temp(4);
46 temp(1,1)=correlation(E,E,e);
47 temp(1,2)=correlation(E,P.x,e);
48 temp(1,3)=correlation(E,P.y,e);
49 temp(1,4)=correlation(E,P.z,e);
50 temp(2,2)=correlation(P.x,P.x,e);
51 temp(2,3)=correlation(P.x,P.y,e);
52 temp(2,4)=correlation(P.x,P.z,e);
53 temp(3,3)=correlation(P.y,P.y,e);
54 temp(3,4)=correlation(P.y,P.z,e);
55 temp(4,4)=correlation(P.z,P.z,e);
56 return temp;
57}
correlation
double correlation(const DifNumber &a, const DifNumber &b)
Definition: DifNumber.cxx:72
DifVector::y
DifNumber y
Definition: DifVector.h:149
DifVector::x
DifNumber x
Definition: DifVector.h:148
DifVector::z
DifNumber z
Definition: DifVector.h:150

◆ jacobian()

HepMatrix DifFourVector::jacobian ( ) const

Definition at line 59 of file DifFourVector.cxx.

59 {
60 int npar=E.nPar();
61 HepMatrix temp(4,npar);
62 for(int i=1; i<=npar; i++){
63 temp(1,i)=E.derivative(i);
64 temp(2,i)=P.x.derivative(i);
65 temp(3,i)=P.y.derivative(i);
66 temp(4,i)=P.z.derivative(i);
67 } // (int i=1; i<=npar; i++)
68 return temp;
69}
DifNumber::derivative
double derivative(int i) const
Definition: DifNumber.h:90
DifNumber::nPar
int nPar() const
Definition: DifNumber.h:92

◆ mass()

DifNumber DifFourVector::mass ( ) const
inline

Definition at line 77 of file DifFourVector.h.

77 {
78 DifNumber temp=massSq();
79 if(temp>=0) return sqrt(temp);
80 return -sqrt(-massSq());
81 }
DifFourVector::massSq
DifNumber massSq() const
Definition: DifFourVector.h:76

Referenced by boostFrom(), boostFromMe(), boostTo(), and boostToMe().

◆ massSq()

DifNumber DifFourVector::massSq ( ) const
inline

Definition at line 76 of file DifFourVector.h.

76{return E*E-P*P;}

Referenced by mass().

◆ nPar()

int DifFourVector::nPar ( ) const
inline

◆ operator+=()

DifFourVector & DifFourVector::operator+= ( const DifFourVector &  v)
inline

◆ operator-()

DifFourVector DifFourVector::operator- ( ) const
inline

◆ operator-=()

DifFourVector & DifFourVector::operator-= ( const DifFourVector &  v)
inline

◆ operator=()

DifFourVector & DifFourVector::operator= ( const DifFourVector &  v)
inline

◆ pMag()

DifNumber DifFourVector::pMag ( ) const
inline

Definition at line 75 of file DifFourVector.h.

75{return P.length();}

Referenced by boostFrom(), boostFromMe(), boostTo(), and boostToMe().

◆ print()

void DifFourVector::print ( ) const

Definition at line 192 of file DifFourVector.cxx.

192 {
193//SKIP cout << "E:" << endl << E;
194//SKIP cout << "P:" << endl << P;
195 cout << "SKIP of DifFourVector::print()" <<endl;//TEMP
196}

◆ zeroDerivatives()

DifFourVector & DifFourVector::zeroDerivatives ( )
inline

Friends And Related Function Documentation

◆ operator*

DifNumber operator* ( const DifFourVector &  a,
const DifFourVector &  b 
)
friend

◆ operator+

DifFourVector operator+ ( const DifFourVector &  a,
const DifFourVector &  b 
)
friend

◆ operator-

DifFourVector operator- ( const DifFourVector &  a,
const DifFourVector &  b 
)
friend

Member Data Documentation

◆ E

DifNumber DifFourVector::E

Definition at line 114 of file DifFourVector.h.

Referenced by boostFrom(), boostFromMe(), boostTo(), boostToMe(), errorMatrix(), jacobian(), and massSq().

◆ P

DifVector DifFourVector::P

Definition at line 115 of file DifFourVector.h.

Referenced by boostFrom(), boostFromMe(), boostTo(), boostToMe(), errorMatrix(), jacobian(), massSq(), and pMag().

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