[u/mrichter/AliRoot.git] / TEvtGen / EvtGenBase / EvtRaritaSchwingerParticle.cxx

//--------------------------------------------------------------------------
//
// Environment:
//      This software is part of the EvtGen package developed jointly
//      for the BaBar and CLEO collaborations.  If you use all or part
//      of it, please give an appropriate acknowledgement.
//
// Copyright Information: See EvtGen/COPYRIGHT
//      Copyright (C) 1998      Caltech, UCSB
//
// Module: EvtRaritaSchwingerParticle.cc
//
// Description: Class to describe spin 1/2 particles.
//
// Modification history:
//
//   RYD     August 9, 2000         Module created
//
//------------------------------------------------------------------------
// 
#include "EvtGenBase/EvtPatches.hh"
#include <stdlib.h>
#include <iostream>
#include <math.h>
#include "EvtGenBase/EvtComplex.hh"
#include "EvtGenBase/EvtRaritaSchwingerParticle.hh"
#include "EvtGenBase/EvtDiracSpinor.hh"
#include "EvtGenBase/EvtVector4R.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtReport.hh"
using std::endl;

EvtRaritaSchwingerParticle::~EvtRaritaSchwingerParticle(){}


EvtRaritaSchwingerParticle::EvtRaritaSchwingerParticle(){

  return;
  
}

void EvtRaritaSchwingerParticle::init(EvtId id,const EvtVector4R& p4){

    _validP4=true;
    setp(p4);
    setpart_num(id);
    
    if (EvtPDL::getStdHep(id)==0){
	report(ERROR,"EvtGen") << "Error in EvtRaritaSchwingerParticle::init, part_n="
			       << id.getId()<<endl;
	::abort();
    }
  
  
    double sqmt2=sqrt(2.0*(this->getP4().mass()));
  
    EvtDiracSpinor spplus;
    EvtDiracSpinor spminus;
      
    if (EvtPDL::getStdHep(getId())>0){  
	spplus.set(sqmt2,0.0,0.0,0.0);
	spminus.set(0.0,sqmt2,0.0,0.0);
    } else {
	spplus.set(0.0,0.0,sqmt2,0.0);
	spminus.set(0.0,0.0,0.0,sqmt2);
    }

    static EvtVector4C eplus(0.0,-1.0/sqrt(2.0),EvtComplex(0.0,-1.0/sqrt(2.0)),0.0);
    static EvtVector4C ezero(0.0,0.0,0.0,1.0);
    static EvtVector4C eminus(0.0,1.0/sqrt(2.0),EvtComplex(0.0,-1.0/sqrt(2.0)),0.0);

    _spinorRest[0]=dirProd(eplus,spplus);
    _spinorRest[1]=dirProd(sqrt(2.0/3.0)*ezero,spplus)+
	dirProd(sqrt(1.0/3.0)*eplus,spminus);
    _spinorRest[2]=dirProd(sqrt(2.0/3.0)*ezero,spminus)+
	dirProd(sqrt(1.0/3.0)*eminus,spplus);
    _spinorRest[3]=dirProd(eminus,spminus);
    
    _spinor[0]=boostTo(_spinorRest[0],p4);
    _spinor[1]=boostTo(_spinorRest[1],p4);
    _spinor[2]=boostTo(_spinorRest[2],p4);
    _spinor[3]=boostTo(_spinorRest[3],p4);
    

    setLifetime();
}


void EvtRaritaSchwingerParticle::init(EvtId id,const EvtVector4R& p4,
				      const EvtRaritaSchwinger & prod1,
				      const EvtRaritaSchwinger & prod2,
				      const EvtRaritaSchwinger & prod3,
				      const EvtRaritaSchwinger & prod4,
				      const EvtRaritaSchwinger & rest1,
				      const EvtRaritaSchwinger & rest2,
				      const EvtRaritaSchwinger & rest3,
				      const EvtRaritaSchwinger & rest4){

  _validP4=true;
  setp(p4);
  setpart_num(id);

  if (EvtPDL::getStdHep(id)==0){
    report(ERROR,"EvtGen") << "Error in EvtRaritaSchwingerParticle::init, part_n="
                           << id.getId()<<std::endl;
    ::abort();
  }
  _spinorRest[0]=rest1;
  _spinorRest[1]=rest2;
  _spinorRest[2]=rest3;
  _spinorRest[3]=rest4;
    
  _spinor[0]=prod1;
  _spinor[1]=prod2;
  _spinor[2]=prod3;
  _spinor[3]=prod4;
  
  setLifetime();
}
 

EvtRaritaSchwinger EvtRaritaSchwingerParticle::spRSParent(int i) const {

  return _spinor[i];

}

EvtRaritaSchwinger EvtRaritaSchwingerParticle::spRS(int i) const {

  return _spinorRest[i];

}


EvtSpinDensity EvtRaritaSchwingerParticle::rotateToHelicityBasis() const{

  double sqmt2=sqrt(2.0*(this->getP4().mass()));
  
  EvtDiracSpinor spplus;
  EvtDiracSpinor spminus;
      
  if (EvtPDL::getStdHep(getId())>0){  
    spplus.set(1.0,0.0,0.0,0.0);
    spminus.set(0.0,1.0,0.0,0.0);
  } else {
    spplus.set(0.0,0.0,1.0,0.0);
    spminus.set(0.0,0.0,0.0,1.0);
  }

  EvtVector4C eplus(0.0,-1.0/sqrt(2.0),EvtComplex(0.0,-1.0/sqrt(2.0)),0.0);
  EvtVector4C ezero(0.0,0.0,0.0,1.0);
  EvtVector4C eminus(0.0,1.0/sqrt(2.0),EvtComplex(0.0,-1.0/sqrt(2.0)),0.0);

  EvtRaritaSchwinger sppp=dirProd(eplus,spplus);
  EvtRaritaSchwinger spp=dirProd(sqrt(2.0/3.0)*ezero,spplus)+
    dirProd(sqrt(1.0/3.0)*eplus,spminus);
  EvtRaritaSchwinger spm=dirProd(sqrt(2.0/3.0)*ezero,spminus)+
    dirProd(sqrt(1.0/3.0)*eminus,spplus);
  EvtRaritaSchwinger spmm=dirProd(eminus,spminus);


  EvtSpinDensity R;
  R.setDim(4);


  for ( int i=0; i<4; i++) {
    R.set(0,i,(sppp*_spinorRest[i])/sqmt2);
    R.set(1,i,(spp*_spinorRest[i])/sqmt2);
    R.set(2,i,(spm*_spinorRest[i])/sqmt2);
    R.set(3,i,(spmm*_spinorRest[i])/sqmt2);
  }

  return R;

}


EvtSpinDensity EvtRaritaSchwingerParticle::rotateToHelicityBasis(double alpha,
								 double beta,
								 double gamma) const{

  EvtDiracSpinor spplus;
  EvtDiracSpinor spminus;
      
  if (EvtPDL::getStdHep(getId())>0){  
    spplus.set(1.0,0.0,0.0,0.0);
    spminus.set(0.0,1.0,0.0,0.0);
  } else {
    spplus.set(0.0,0.0,1.0,0.0);
    spminus.set(0.0,0.0,0.0,1.0);
  }

  EvtVector4C eplus(0.0,-1.0/sqrt(2.0),EvtComplex(0.0,-1.0/sqrt(2.0)),0.0);
  EvtVector4C ezero(0.0,0.0,0.0,1.0);
  EvtVector4C eminus(0.0,1.0/sqrt(2.0),EvtComplex(0.0,-1.0/sqrt(2.0)),0.0);

  EvtRaritaSchwinger sppp=dirProd(eplus,spplus);
  EvtRaritaSchwinger spp=dirProd(sqrt(2.0/3.0)*ezero,spplus)+
    dirProd(sqrt(1.0/3.0)*eplus,spminus);
  EvtRaritaSchwinger spm=dirProd(sqrt(2.0/3.0)*ezero,spminus)+
    dirProd(sqrt(1.0/3.0)*eminus,spplus);
  EvtRaritaSchwinger spmm=dirProd(eminus,spminus);


  sppp.applyRotateEuler(alpha,beta,gamma);
  spp.applyRotateEuler(alpha,beta,gamma);
  spm.applyRotateEuler(alpha,beta,gamma);
  spmm.applyRotateEuler(alpha,beta,gamma);

  EvtSpinDensity R;
  R.setDim(4);

  double sqmt2=sqrt(2.0*(this->getP4().mass()));

  for ( int i=0; i<4; i++) {
    R.set(0,i,(sppp*_spinorRest[i])/sqmt2);
    R.set(1,i,(spp*_spinorRest[i])/sqmt2);
    R.set(2,i,(spm*_spinorRest[i])/sqmt2);
    R.set(3,i,(spmm*_spinorRest[i])/sqmt2);
  }

  return R;

}
Commit	Line	Data
da0e9ce3	1	//--------------------------------------------------------------------------
	2	//
	3	// Environment:
	4	// This software is part of the EvtGen package developed jointly
	5	// for the BaBar and CLEO collaborations. If you use all or part
	6	// of it, please give an appropriate acknowledgement.
	7	//
	8	// Copyright Information: See EvtGen/COPYRIGHT
	9	// Copyright (C) 1998 Caltech, UCSB
	10	//
	11	// Module: EvtRaritaSchwingerParticle.cc
	12	//
	13	// Description: Class to describe spin 1/2 particles.
	14	//
	15	// Modification history:
	16	//
	17	// RYD August 9, 2000 Module created
	18	//
	19	//------------------------------------------------------------------------
	20	//
	21	#include "EvtGenBase/EvtPatches.hh"
	22	#include <stdlib.h>
	23	#include <iostream>
	24	#include <math.h>
	25	#include "EvtGenBase/EvtComplex.hh"
	26	#include "EvtGenBase/EvtRaritaSchwingerParticle.hh"
	27	#include "EvtGenBase/EvtDiracSpinor.hh"
	28	#include "EvtGenBase/EvtVector4R.hh"
	29	#include "EvtGenBase/EvtPDL.hh"
	30	#include "EvtGenBase/EvtReport.hh"
	31	using std::endl;
	32
	33	EvtRaritaSchwingerParticle::~EvtRaritaSchwingerParticle(){}
	34
	35
	36	EvtRaritaSchwingerParticle::EvtRaritaSchwingerParticle(){
	37
	38	return;
	39
	40	}
	41
	42	void EvtRaritaSchwingerParticle::init(EvtId id,const EvtVector4R& p4){
	43
	44	_validP4=true;
	45	setp(p4);
	46	setpart_num(id);
	47
	48	if (EvtPDL::getStdHep(id)==0){
	49	report(ERROR,"EvtGen") << "Error in EvtRaritaSchwingerParticle::init, part_n="
	50	<< id.getId()<<endl;
	51	::abort();
	52	}
	53
	54
	55
	56	double sqmt2=sqrt(2.0*(this->getP4().mass()));
	57
	58	EvtDiracSpinor spplus;
	59	EvtDiracSpinor spminus;
	60
	61	if (EvtPDL::getStdHep(getId())>0){
	62	spplus.set(sqmt2,0.0,0.0,0.0);
	63	spminus.set(0.0,sqmt2,0.0,0.0);
	64	} else {
65	spplus.set(0.0,0.0,sqmt2,0.0);
66	spminus.set(0.0,0.0,0.0,sqmt2);
67	}
68
69	static EvtVector4C eplus(0.0,-1.0/sqrt(2.0),EvtComplex(0.0,-1.0/sqrt(2.0)),0.0);
70	static EvtVector4C ezero(0.0,0.0,0.0,1.0);
71	static EvtVector4C eminus(0.0,1.0/sqrt(2.0),EvtComplex(0.0,-1.0/sqrt(2.0)),0.0);
72
73	_spinorRest[0]=dirProd(eplus,spplus);
74	_spinorRest[1]=dirProd(sqrt(2.0/3.0)*ezero,spplus)+
75	dirProd(sqrt(1.0/3.0)*eplus,spminus);
76	_spinorRest[2]=dirProd(sqrt(2.0/3.0)*ezero,spminus)+
77	dirProd(sqrt(1.0/3.0)*eminus,spplus);
78	_spinorRest[3]=dirProd(eminus,spminus);
79
80	_spinor[0]=boostTo(_spinorRest[0],p4);
81	_spinor[1]=boostTo(_spinorRest[1],p4);
82	_spinor[2]=boostTo(_spinorRest[2],p4);
83	_spinor[3]=boostTo(_spinorRest[3],p4);
84
85
86	setLifetime();
87	}
88
89
90	void EvtRaritaSchwingerParticle::init(EvtId id,const EvtVector4R& p4,
91	const EvtRaritaSchwinger & prod1,
92	const EvtRaritaSchwinger & prod2,
93	const EvtRaritaSchwinger & prod3,
94	const EvtRaritaSchwinger & prod4,
95	const EvtRaritaSchwinger & rest1,
96	const EvtRaritaSchwinger & rest2,
97	const EvtRaritaSchwinger & rest3,
98	const EvtRaritaSchwinger & rest4){
99
100	_validP4=true;
101	setp(p4);
102	setpart_num(id);
103
104	if (EvtPDL::getStdHep(id)==0){
105	report(ERROR,"EvtGen") << "Error in EvtRaritaSchwingerParticle::init, part_n="
106	<< id.getId()<<std::endl;
107	::abort();
108	}
109	_spinorRest[0]=rest1;
110	_spinorRest[1]=rest2;
111	_spinorRest[2]=rest3;
112	_spinorRest[3]=rest4;
113
114	_spinor[0]=prod1;
115	_spinor[1]=prod2;
116	_spinor[2]=prod3;
117	_spinor[3]=prod4;
118
119	setLifetime();
120	}
121
122
123
124	EvtRaritaSchwinger EvtRaritaSchwingerParticle::spRSParent(int i) const {
125
126	return _spinor[i];
127
128	}
129
130	EvtRaritaSchwinger EvtRaritaSchwingerParticle::spRS(int i) const {
131
132	return _spinorRest[i];
133
134	}
135
136
137
138	EvtSpinDensity EvtRaritaSchwingerParticle::rotateToHelicityBasis() const{
139
140	double sqmt2=sqrt(2.0*(this->getP4().mass()));
141
142	EvtDiracSpinor spplus;
143	EvtDiracSpinor spminus;
144
145	if (EvtPDL::getStdHep(getId())>0){
146	spplus.set(1.0,0.0,0.0,0.0);
147	spminus.set(0.0,1.0,0.0,0.0);
148	} else {
149	spplus.set(0.0,0.0,1.0,0.0);
150	spminus.set(0.0,0.0,0.0,1.0);
151	}
152
153	EvtVector4C eplus(0.0,-1.0/sqrt(2.0),EvtComplex(0.0,-1.0/sqrt(2.0)),0.0);
154	EvtVector4C ezero(0.0,0.0,0.0,1.0);
155	EvtVector4C eminus(0.0,1.0/sqrt(2.0),EvtComplex(0.0,-1.0/sqrt(2.0)),0.0);
156
157	EvtRaritaSchwinger sppp=dirProd(eplus,spplus);
158	EvtRaritaSchwinger spp=dirProd(sqrt(2.0/3.0)*ezero,spplus)+
159	dirProd(sqrt(1.0/3.0)*eplus,spminus);
160	EvtRaritaSchwinger spm=dirProd(sqrt(2.0/3.0)*ezero,spminus)+
161	dirProd(sqrt(1.0/3.0)*eminus,spplus);
162	EvtRaritaSchwinger spmm=dirProd(eminus,spminus);
163
164
165	EvtSpinDensity R;
166	R.setDim(4);
167
168
169	for ( int i=0; i<4; i++) {
170	R.set(0,i,(sppp*_spinorRest[i])/sqmt2);
171	R.set(1,i,(spp*_spinorRest[i])/sqmt2);
172	R.set(2,i,(spm*_spinorRest[i])/sqmt2);
173	R.set(3,i,(spmm*_spinorRest[i])/sqmt2);
174	}
175
176	return R;
177
178	}
179
180
181	EvtSpinDensity EvtRaritaSchwingerParticle::rotateToHelicityBasis(double alpha,
182	double beta,
183	double gamma) const{
184
185	EvtDiracSpinor spplus;
186	EvtDiracSpinor spminus;
187
188	if (EvtPDL::getStdHep(getId())>0){
189	spplus.set(1.0,0.0,0.0,0.0);
190	spminus.set(0.0,1.0,0.0,0.0);
191	} else {
192	spplus.set(0.0,0.0,1.0,0.0);
193	spminus.set(0.0,0.0,0.0,1.0);
194	}
195
196	EvtVector4C eplus(0.0,-1.0/sqrt(2.0),EvtComplex(0.0,-1.0/sqrt(2.0)),0.0);
197	EvtVector4C ezero(0.0,0.0,0.0,1.0);
198	EvtVector4C eminus(0.0,1.0/sqrt(2.0),EvtComplex(0.0,-1.0/sqrt(2.0)),0.0);
199
200	EvtRaritaSchwinger sppp=dirProd(eplus,spplus);
201	EvtRaritaSchwinger spp=dirProd(sqrt(2.0/3.0)*ezero,spplus)+
202	dirProd(sqrt(1.0/3.0)*eplus,spminus);
203	EvtRaritaSchwinger spm=dirProd(sqrt(2.0/3.0)*ezero,spminus)+
204	dirProd(sqrt(1.0/3.0)*eminus,spplus);
205	EvtRaritaSchwinger spmm=dirProd(eminus,spminus);
206
207
208	sppp.applyRotateEuler(alpha,beta,gamma);
209	spp.applyRotateEuler(alpha,beta,gamma);
210	spm.applyRotateEuler(alpha,beta,gamma);
211	spmm.applyRotateEuler(alpha,beta,gamma);
212
213	EvtSpinDensity R;
214	R.setDim(4);
215
216	double sqmt2=sqrt(2.0*(this->getP4().mass()));
217
218	for ( int i=0; i<4; i++) {
219	R.set(0,i,(sppp*_spinorRest[i])/sqmt2);
220	R.set(1,i,(spp*_spinorRest[i])/sqmt2);
221	R.set(2,i,(spm*_spinorRest[i])/sqmt2);
222	R.set(3,i,(spmm*_spinorRest[i])/sqmt2);
223	}
224
225	return R;
226
227	}
228