CGEM BOSS 6.6.5.i
BESIII Offline Software System
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Public Member Functions | Public Attributes | List of all members
EvtJ2BB3 Class Reference

#include <EvtJ2BB3.hh>

+ Inheritance diagram for EvtJ2BB3:

Public Member Functions

 EvtJ2BB3 ()
 
virtual ~EvtJ2BB3 ()
 
void getName (std::string &name)
 
EvtDecayBase * clone ()
 
void decay (EvtParticle *p)
 
void init ()
 
void init (int, double *)
 
- Public Member Functions inherited from EvtDecayAmp
void makeDecay (EvtParticle *p)
 
void setWeight (double weight)
 
void vertex (const EvtComplex &amp)
 
void vertex (int i1, const EvtComplex &amp)
 
void vertex (int i1, int i2, const EvtComplex &amp)
 
void vertex (int i1, int i2, int i3, const EvtComplex &amp)
 
void vertex (int *i1, const EvtComplex &amp)
 
virtual ~EvtDecayAmp ()
 
- Public Member Functions inherited from EvtDecayBase
virtual void initProbMax ()
 
virtual std::string commandName ()
 
virtual void command (std::string cmd)
 
double getProbMax (double prob)
 
double resetProbMax (double prob)
 
 EvtDecayBase ()
 
virtual ~EvtDecayBase ()
 
virtual bool matchingDecay (const EvtDecayBase &other) const
 
EvtId getParentId ()
 
double getBranchingFraction ()
 
void disableCheckQ ()
 
void checkQ ()
 
int getNDaug ()
 
EvtId * getDaugs ()
 
EvtId getDaug (int i)
 
int getNArg ()
 
int getPHOTOS ()
 
void setPHOTOS ()
 
void setVerbose ()
 
void setSummary ()
 
double * getArgs ()
 
std::string * getArgsStr ()
 
double getArg (int j)
 
std::string getArgStr (int j)
 
std::string getModelName ()
 
int getDSum ()
 
int summary ()
 
int verbose ()
 
void saveDecayInfo (EvtId ipar, int ndaug, EvtId *daug, int narg, std::vector< std::string > &args, std::string name, double brfr)
 
void printSummary ()
 
void setProbMax (double prbmx)
 
void noProbMax ()
 
void checkNArg (int a1, int a2=-1, int a3=-1, int a4=-1)
 
void checkNDaug (int d1, int d2=-1)
 
void checkSpinParent (EvtSpinType::spintype sp)
 
void checkSpinDaughter (int d1, EvtSpinType::spintype sp)
 
virtual int nRealDaughters ()
 

Public Attributes

double alpha
 
double u
 

Additional Inherited Members

- Static Public Member Functions inherited from EvtDecayBase
static void findMasses (EvtParticle *p, int ndaugs, EvtId daugs[10], double masses[10])
 
static void findMass (EvtParticle *p)
 
static double findMaxMass (EvtParticle *p)
 
- Protected Member Functions inherited from EvtDecayBase
bool daugsDecayedByParentModel ()
 
- Protected Attributes inherited from EvtDecayAmp
EvtAmp _amp2
 
- Protected Attributes inherited from EvtDecayBase
bool _daugsDecayedByParentModel
 

Detailed Description

Definition at line 32 of file EvtJ2BB3.hh.

Constructor & Destructor Documentation

◆ EvtJ2BB3()

EvtJ2BB3::EvtJ2BB3 ( )
inline

Definition at line 36 of file EvtJ2BB3.hh.

36{}

Referenced by clone().

◆ ~EvtJ2BB3()

EvtJ2BB3::~EvtJ2BB3 ( )
virtual

Definition at line 42 of file EvtJ2BB3.cc.

42{}

Member Function Documentation

◆ clone()

EvtDecayBase * EvtJ2BB3::clone ( )
virtual

Implements EvtDecayBase.

Definition at line 51 of file EvtJ2BB3.cc.

51 {
52
53 return new EvtJ2BB3;
54
55}

◆ decay()

void EvtJ2BB3::decay ( EvtParticle * p)
virtual

Implements EvtDecayBase.

Definition at line 74 of file EvtJ2BB3.cc.

74 {
75 loop:
76 p->initializePhaseSpace(getNDaug(),getDaugs());
77
78 EvtParticle *v,*s1;
79 EvtVector4R pv,ps,ppr;
80
81 v =p->getDaug(0);
82 s1=p->getDaug(1);
83 pv=v->getP4();
84 ps=s1->getP4();
85 ppr=p->getP4();
86// Put phase space results into the daughters.
87 EvtHelSys angles(ppr,pv); //using helicity sys. angles
88 double theta =angles.getHelAng(1);
89 double phi =angles.getHelAng(2);
90 double gamma=0;
91
92 double m_b0 = EvtPDL::getMass(getDaug(0)); //the mass of daughter1 is large than daughter0.
93 double m_b1 = EvtPDL::getMass(getDaug(1));
94
95
96 double m_M = EvtPDL::getMass(getParentId());
97 double M2=pow(m_M,2.0);double b2_p=pow((m_b0+m_b1),2.0);
98 double b2_m=pow((m_b1-m_b0),2.0);
99
100 if(M2-b2_p<=0) goto loop;
101
102 double P_c=sqrt((M2-b2_p)*(M2-b2_m)/(4.0*M2));
103 double Q=M2-b2_p;
104 double F1=-0.54/(m_b0*b2_p);
105 double F2=-0.54*(m_b1-m_b0)/(m_b0*(m_b0+m_b1));
106 double F3=-0.89/m_b0;
107 double H1,H0,Hm1;
108
109//OK. We have all tested these parameters.
110
111 if(getNArg()>0)
112 { alpha=getArg(0);
113 H0=1.0;H1=sqrt((1+alpha)/(1-alpha));Hm1=H1;
114 }
115 else{
116 H1=-1.15*P_c*m_M*(-M2*Q*F1-Q*F2+(M2-m_b0*(m_b0+m_b1))*F3)/(sqrt(Q)*m_b1);
117 H0=-0.82*P_c*M2*(-(m_b1-m_b0)*Q*F1/m_b1-Q*F2/(m_b1*(m_b1-m_b0))+2.0*F3)/sqrt(Q);
118 Hm1=2*P_c*m_M*(m_b0+m_b1)*F3/sqrt(Q);
119 alpha=(H1*H1+Hm1*Hm1-2*H0*H0)/(H1*H1+Hm1*Hm1+2*H0*H0);
120 }
121//cout<<"------alpha="<<alpha<<";H0="<<H0<<";H1="<<H1<<";Hm1="<<Hm1<<endl;
122
123// J/psi helicity =1 corresponding index=0
124 vertex(0,0,0,Djmn(1, 1, 0,phi,theta,gamma)*H0);
125 vertex(0,0,1,Djmn(1, 1,-1,phi,theta,gamma)*Hm1);
126 vertex(0,0,2,0.0);
127 vertex(0,0,3,Djmn(1, 1, 1,phi,theta,gamma)*H1);
128 vertex(0,1,0,Djmn(1, 1,-1,phi,theta,gamma)*H1);
129 vertex(0,1,1,0.0);
130 vertex(0,1,2,Djmn(1, 1, 1,phi,theta,gamma)*Hm1);
131 vertex(0,1,3,Djmn(1, 1, 0,phi,theta,gamma)*H0);
132// J/psi helicity =-1 corresponding index=1
133 vertex(1,0,0,Djmn(1,-1, 0,phi,theta,gamma)*H0);
134 vertex(1,0,1,Djmn(1,-1,-1,phi,theta,gamma)*Hm1);
135 vertex(1,0,2,0.0);
136 vertex(1,0,3,Djmn(1,-1, 1,phi,theta,gamma)*H1);
137 vertex(1,1,0,Djmn(1,-1,-1,phi,theta,gamma)*H1);
138 vertex(1,1,1,0.0);
139 vertex(1,1,2,Djmn(1,-1, 1,phi,theta,gamma)*Hm1);
140 vertex(1,1,3,Djmn(1,-1, 0,phi,theta,gamma)*H0);
141
142// J/psi helicity =0 corresponding index=2
143 vertex(2,0,0,Djmn(1, 0, 0,phi,theta,gamma)*H0);
144 vertex(2,0,1,Djmn(1, 0,-1,phi,theta,gamma)*Hm1);
145 vertex(2,0,2,0.0);
146 vertex(2,0,3,Djmn(1, 0, 1,phi,theta,gamma)*H1);
147 vertex(2,1,0,Djmn(1, 0,-1,phi,theta,gamma)*H1);
148 vertex(2,1,1,0.0);
149 vertex(2,1,2,Djmn(1, 0, 1,phi,theta,gamma)*Hm1);
150 vertex(2,1,3,Djmn(1, 0, 0,phi,theta,gamma)*H0);
151
152 return ;
153
154}
Djmn
EvtComplex Djmn(int j, int m, int n, double phi, double theta, double gamma)
Definition EvtHelSys.cc:151
m_b1
*********DOUBLE PRECISION m_pi INTEGER m_lenwt !max no of aux weights INTEGER m_phmax !maximum photon multiplicity ISR FSR *DOUBLE COMPLEX m_Pauli4 DOUBLE COMPLEX m_AmpBorn DOUBLE COMPLEX m_AmpBoxy DOUBLE COMPLEX m_AmpBorn1 DOUBLE COMPLEX m_AmpBorn2 DOUBLE COMPLEX m_AmpExpo2p DOUBLE COMPLEX m_Rmat DOUBLE COMPLEX m_BoxGZut !DOUBLE COMPLEX m_F1finPair2 !DOUBLE PRECISION m_Vcut DOUBLE PRECISION m_Alfinv DOUBLE PRECISION m_Lorin1 DOUBLE PRECISION m_Lorin2 DOUBLE PRECISION m_b1
Definition GPS.h:30
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
EvtDecayAmp::vertex
void vertex(const EvtComplex &amp)
Definition EvtDecayAmp.hh:37
EvtDecayBase::getArg
double getArg(int j)
Definition EvtDecayBase.cc:564
EvtDecayBase::getParentId
EvtId getParentId()
Definition EvtDecayBase.hh:60
EvtDecayBase::getDaugs
EvtId * getDaugs()
Definition EvtDecayBase.hh:65
EvtDecayBase::getDaug
EvtId getDaug(int i)
Definition EvtDecayBase.hh:66
EvtJ2BB3::alpha
double alpha
Definition EvtJ2BB3.hh:47
EvtPDL::getMass
static double getMass(EvtId i)
Definition EvtPDL.hh:46
EvtParticle::getP4
const EvtVector4R & getP4() const
Definition EvtParticle.cc:121
EvtParticle::getDaug
EvtParticle * getDaug(int i)
Definition EvtParticle.cc:85
EvtParticle::initializePhaseSpace
double initializePhaseSpace(int numdaughter, EvtId *daughters, double poleSize=-1., int whichTwo1=0, int whichTwo2=1)
Definition EvtParticle.cc:1069

◆ getName()

void EvtJ2BB3::getName ( std::string & name)
virtual

Implements EvtDecayBase.

Definition at line 44 of file EvtJ2BB3.cc.

44 {
45
46 model_name="J2BB3";
47
48}

◆ init() [1/2]

void EvtJ2BB3::init ( )
virtual

Reimplemented from EvtDecayBase.

Definition at line 57 of file EvtJ2BB3.cc.

57 {
58// checkNArg(1);
59 checkNDaug(2);
60 checkSpinParent(EvtSpinType::VECTOR);
61 checkSpinDaughter(0,EvtSpinType::DIRAC);
62 checkSpinDaughter(1,EvtSpinType::RARITASCHWINGER);
63 }
EvtDecayBase::checkSpinDaughter
void checkSpinDaughter(int d1, EvtSpinType::spintype sp)
Definition EvtDecayBase.cc:533
EvtDecayBase::checkSpinParent
void checkSpinParent(EvtSpinType::spintype sp)
Definition EvtDecayBase.cc:520
EvtDecayBase::checkNDaug
void checkNDaug(int d1, int d2=-1)
Definition EvtDecayBase.cc:504

◆ init() [2/2]

void EvtJ2BB3::init ( int ,
double *  )

Member Data Documentation

◆ alpha

double EvtJ2BB3::alpha

Definition at line 47 of file EvtJ2BB3.hh.

Referenced by decay().

◆ u

double EvtJ2BB3::u

Definition at line 48 of file EvtJ2BB3.hh.

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