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00020
00021 #include "EvtGenBase/EvtPatches.hh"
00022 #include <stdlib.h>
00023 #include "EvtGenBase/EvtParticle.hh"
00024 #include "EvtGenBase/EvtGenKine.hh"
00025 #include "EvtGenBase/EvtPDL.hh"
00026 #include "EvtGenBase/EvtVector4C.hh"
00027 #include "EvtGenBase/EvtVector4R.hh"
00028 #include "EvtGenBase/EvtTensor4C.hh"
00029 #include "EvtGenBase/EvtReport.hh"
00030 #include "EvtGenBase/EvtHelSys.hh"
00031 #include "EvtP2GC2.hh"
00032 #include "EvtGenBase/EvtdFunctionSingle.hh"
00033 #include <string>
00034 using std::endl;
00035
00036 EvtP2GC2::~EvtP2GC2() {}
00037
00038 void EvtP2GC2::getName(std::string& model_name){
00039
00040 model_name="P2GC2";
00041
00042 }
00043
00044
00045 EvtDecayBase* EvtP2GC2::clone(){
00046
00047 return new EvtP2GC2;
00048
00049 }
00050
00051 void EvtP2GC2::init(){
00052 static EvtId GAM=EvtPDL::getId("gamma");
00053
00054 checkNArg(0);
00055 checkNDaug(2);
00056 checkSpinParent(EvtSpinType::VECTOR);
00057 checkSpinDaughter(0,EvtSpinType::PHOTON);
00058 checkSpinDaughter(1,EvtSpinType::TENSOR);
00059 if (!(getDaug(0)==GAM)) {
00060 report(ERROR,"EvtGen") << "EvtP2GC2 generator radiative decays expected "<<endl;
00061 ::abort();
00062 }
00063 }
00064
00065
00066 void EvtP2GC2::initProbMax() {
00067
00068
00069 setProbMax(11.0);
00070
00071 }
00072
00073 void EvtP2GC2::decay( EvtParticle *p){
00074
00075 p->initializePhaseSpace(getNDaug(),getDaugs());
00076
00077 EvtParticle *v,*s1;
00078 EvtVector4R pv,ps,ppr;
00079
00080 v =p->getDaug(0);
00081 s1=p->getDaug(1);
00082 pv=v->getP4();
00083 ps=s1->getP4();
00084 ppr=p->getP4();
00085
00086
00087 EvtHelSys angles(ppr,pv);
00088 double theta =angles.getHelAng(1);
00089 double phi =angles.getHelAng(2);
00090 double gamma =0.;
00091
00092 double A10=1.0,A11=2.08,A12=3.03;
00093 double Af10=A10,Af1f1=A11,Af1f2=A12;
00094 int j1,j2,j3;
00095 for(j1=0;j1<=2;){
00096 for(j2=0;j2<=1;){
00097 for(j3=0;j3<=4;){
00098 vertex(j1,j2,j3,0.0);j3++;}
00099 j2++;}
00100 j1++;}
00101
00102 vertex(0,0,1,Djmn(1, 1,-1,phi,theta,gamma)*A12);
00103 vertex(0,0,3,Djmn(1, 1, 0,phi,theta,gamma)*A11);
00104 vertex(0,0,0,Djmn(1, 1, 1,phi,theta,gamma)*A10);
00105 vertex(0,1,0,Djmn(1, 1,-1,phi,theta,gamma)*Af10);
00106 vertex(0,1,4,Djmn(1, 1, 0,phi,theta,gamma)*Af1f1);
00107 vertex(0,1,2,Djmn(1, 1, 1,phi,theta,gamma)*Af1f2);
00108
00109 vertex(1,0,1,Djmn(1,-1,-1,phi,theta,gamma)*A12);
00110 vertex(1,0,3,Djmn(1,-1, 0,phi,theta,gamma)*A11);
00111 vertex(1,0,0,Djmn(1,-1, 1,phi,theta,gamma)*A10);
00112 vertex(1,1,0,Djmn(1,-1,-1,phi,theta,gamma)*Af10);
00113 vertex(1,1,4,Djmn(1,-1, 0,phi,theta,gamma)*Af1f1);
00114 vertex(1,1,2,Djmn(1,-1, 1,phi,theta,gamma)*Af1f2);
00115
00116 vertex(2,0,1,Djmn(1, 0,-1,phi,theta,gamma)*A12);
00117 vertex(2,0,3,Djmn(1, 0, 0,phi,theta,gamma)*A11);
00118 vertex(2,0,0,Djmn(1, 0, 1,phi,theta,gamma)*A10);
00119 vertex(2,1,0,Djmn(1, 0,-1,phi,theta,gamma)*Af10);
00120 vertex(2,1,4,Djmn(1, 0, 0,phi,theta,gamma)*Af1f1);
00121 vertex(2,1,2,Djmn(1, 0, 1,phi,theta,gamma)*Af1f2);
00122
00123 return ;
00124
00125 }
00126
00127
00128
00129