[u/mrichter/AliRoot.git] / TEvtGen / EvtGenModels / EvtSVVHelCPMix.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: EvtSVVHelCPMix.cc
//
// Description: Routine to decay scalar -> 2 vectors
//              by specifying the helicity amplitudes, taking appropriate
//		weak phases into account to get mixing and CP violation through
//		interference. Based on EvtSVVHelAmp. Particularly appropriate for
//		Bs->J/Psi+Phi
//
// Modification history:
//
//    RYD       November 24, 1996       EvtSVVHelAmp Module
//    CATMORE   March 2004		Modified to EvtSVVHelCPMix
//
// Model takes the following as user-specified arguments:
//	deltaM, averageM - mass diference and average of light and heavy mass eigenstates (real scalars)
//	gamma, deltagamma - average width and width difference of the l and h eigenstates (real scalars)
//	delta1, delta2 - strong phases (real scalars)
//	direct weak phase (real scalar) (for Bs->JPsiPhi this will be zero)	
//	weak mixing phase (real scalar) (this is equal to 2*arg(Vts Vtb) for Bs->JPsiPhi)
//	Magnitudes of helicity amplitudes as in SVV_HELAMP
// See Phys Rev D 34 p1404 - p1417 and chapters 5 and 7 of Physics Reports 370 p537-680 for more details
//------------------------------------------------------------------------
// 
#ifdef WIN32 
  #pragma warning( disable : 4786 ) 
  // Disable anoying warning about symbol size 
#endif 
#include <iostream>
#include <fstream>
#include <stdlib.h>
#include <ctype.h>
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtGenKine.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtVector4C.hh"
#include "EvtGenBase/EvtTensor4C.hh"
#include "EvtGenBase/EvtVector3C.hh"
#include "EvtGenBase/EvtVector3R.hh"
#include "EvtGenBase/EvtTensor3C.hh"
#include "EvtGenBase/EvtReport.hh"
#include "EvtGenModels/EvtSVVHelCPMix.hh"
#include "EvtGenBase/EvtId.hh"
#include <string>

EvtSVVHelCPMix::~EvtSVVHelCPMix() {}

std::string EvtSVVHelCPMix::getName(){

  return "SVVHELCPMIX";     

}


EvtDecayBase* EvtSVVHelCPMix::clone(){

  return new EvtSVVHelCPMix;

}

void EvtSVVHelCPMix::init(){

  // check that there are 12 arguments
  checkNArg(12);
  checkNDaug(2);

  checkSpinParent(EvtSpinType::SCALAR);

  checkSpinDaughter(0,EvtSpinType::VECTOR);
  checkSpinDaughter(1,EvtSpinType::VECTOR);

  hp = EvtComplex(getArg(0)*cos(getArg(1)),getArg(0)*sin(getArg(1)));
  h0 = EvtComplex(getArg(2)*cos(getArg(3)),getArg(2)*sin(getArg(3)));
  hm = EvtComplex(getArg(4)*cos(getArg(5)),getArg(4)*sin(getArg(5)));
  averageM = getArg(6);
  deltaM = getArg(7);
  gamma = getArg(8);
  deltagamma = getArg(9);
  weakmixingphase = EvtComplex(cos(getArg(10)),sin(getArg(10)));
  weakdirectphase = EvtComplex(cos(getArg(11)),sin(getArg(11)));
}


void EvtSVVHelCPMix::initProbMax(){

  setProbMax(getArg(0)*getArg(0)+getArg(2)*getArg(2)+getArg(4)*getArg(4));
  
}


void EvtSVVHelCPMix::decay( EvtParticle *p){

  EvtParticle* parent = p;
  EvtAmp& amp = _amp2;
  EvtId n_v1 = getDaug(0);
  EvtId n_v2 = getDaug(1);
	
  //  Routine to decay a vector into a vector and scalar.  Started
  //  by ryd on Oct 17, 1996.
  // Modified by J.Catmore to take account of CP-violation and mixing
    
  int tndaug = 2;
  EvtId tdaug[2];
  EvtId Bs=EvtPDL::getId("B_s0");
  EvtId antiBs=EvtPDL::getId("anti-B_s0");
  tdaug[0] = n_v1;
  tdaug[1] = n_v2;

// Phase space and kinematics

  parent->initializePhaseSpace(tndaug,tdaug);

  EvtParticle *v1,*v2;
  v1 = parent->getDaug(0);
  v2 = parent->getDaug(1);

  EvtVector4R momv1 = v1->getP4();
  EvtVector4R momv2 = v2->getP4();

  EvtVector3R v1dir(momv1.get(1),momv1.get(2),momv1.get(3));
  v1dir=v1dir/v1dir.d3mag();

// Definition of quantities used in construction of complex amplitudes:

EvtTensor3C M;  // Tensor as defined in EvtGen manual, equ 117
EvtComplex a,b,c; // Helicity amplitudes; EvtGen manual eqns 126-128, also see Phys Lett B 369 p144-150 eqn 15
EvtComplex deltamu = EvtComplex(deltaM, -0.5*deltagamma); // See Phys Rev D 34 p1404

// conversion from times in mm/c to natural units [GeV]^-1
double t = ((parent->getLifetime())/2.998e11)*6.58e-25; 

// The following two quantities defined in Phys Rev D 34 p1404
EvtComplex fplus =  EvtComplex(cos(averageM*t),-1.*sin(averageM*t))*exp(-(gamma/2.0)*t)*
    (cos(0.5*deltaM*t)*cosh(0.25*deltagamma*t)+EvtComplex(0.0,sin(0.5*deltaM*t)*sinh(0.25*deltagamma*t)));
EvtComplex fminus = EvtComplex(cos(averageM*t), -1.*sin(averageM*t))*exp(-(gamma/2.0)*t)*EvtComplex(0.0,1.0)*
    (sin(0.5*deltaM*t)*cosh(0.25*deltagamma*t)-EvtComplex(0.0,1.0)*sinh(0.25*deltagamma*t)*cos(0.5*deltaM*t)); 

// See EvtGen manual pp 106-107

  a=-0.5*(hp+hm);
  b=EvtComplex(0.0,0.5)*(hp-hm);
  c=(h0+0.5*(hp+hm));
  
  M=a*EvtTensor3C::id()+
                b*eps(v1dir)+
                c*directProd(v1dir,v1dir);
		
  EvtVector3C t0=M.cont1(v1->eps(0).vec().conj());
  EvtVector3C t1=M.cont1(v1->eps(1).vec().conj());
  EvtVector3C t2=M.cont1(v1->eps(2).vec().conj());

  EvtVector3C eps0=v2->eps(0).vec().conj();
  EvtVector3C eps1=v2->eps(1).vec().conj();
  EvtVector3C eps2=v2->eps(2).vec().conj();

// We need two sets of equations, one for mesons which were in the Bs state at t=0, and another
// for those which were in the antiBs state. Each equation consists of a sum of amplitudes - mod-squaring gives the interference terms.

	EvtComplex amplSum00, amplSum01, amplSum02;
	EvtComplex amplSum10, amplSum11, amplSum12;
	EvtComplex amplSum20, amplSum21, amplSum22;

  // First the Bs state:
  
  if (parent->getId()==Bs) {
	
	amplSum00 = (fplus*weakdirectphase*t0*eps0) + (fminus*(1.0/weakdirectphase)*weakmixingphase*t0*eps0);
	amplSum01 = (fplus*weakdirectphase*t0*eps1) + (fminus*(1.0/weakdirectphase)*weakmixingphase*t0*eps1);
 	amplSum02 = (fplus*weakdirectphase*t0*eps2) + (fminus*(1.0/weakdirectphase)*weakmixingphase*t0*eps2);

	amplSum10 = (fplus*weakdirectphase*t1*eps0) + (fminus*(1.0/weakdirectphase)*weakmixingphase*t1*eps0);
	amplSum11 = (fplus*weakdirectphase*t1*eps1) + (fminus*(1.0/weakdirectphase)*weakmixingphase*t1*eps1);
 	amplSum12 = (fplus*weakdirectphase*t1*eps2) + (fminus*(1.0/weakdirectphase)*weakmixingphase*t1*eps2);

	amplSum20 = (fplus*weakdirectphase*t2*eps0) + (fminus*(1.0/weakdirectphase)*weakmixingphase*t2*eps0);
	amplSum21 = (fplus*weakdirectphase*t2*eps1) + (fminus*(1.0/weakdirectphase)*weakmixingphase*t2*eps1);
 	amplSum22 = (fplus*weakdirectphase*t2*eps2) + (fminus*(1.0/weakdirectphase)*weakmixingphase*t2*eps2);
  }

  // Now the anti-Bs state:

  if (parent->getId()==antiBs) {
  
	amplSum00 = (fminus*weakdirectphase*(1.0/weakmixingphase)*t0*eps0) + (fplus*(1.0/weakdirectphase)*t0*eps0);
	amplSum01 = (fminus*weakdirectphase*(1.0/weakmixingphase)*t0*eps1) + (fplus*(1.0/weakdirectphase)*t0*eps1);
 	amplSum02 = (fminus*weakdirectphase*(1.0/weakmixingphase)*t0*eps2) + (fplus*(1.0/weakdirectphase)*t0*eps2);

	amplSum10 = (fminus*weakdirectphase*(1.0/weakmixingphase)*t1*eps0) + (fplus*(1.0/weakdirectphase)*t1*eps0);
	amplSum11 = (fminus*weakdirectphase*(1.0/weakmixingphase)*t1*eps1) + (fplus*(1.0/weakdirectphase)*t1*eps1);
 	amplSum12 = (fminus*weakdirectphase*(1.0/weakmixingphase)*t1*eps2) + (fplus*(1.0/weakdirectphase)*t1*eps2);

	amplSum20 = (fminus*weakdirectphase*(1.0/weakmixingphase)*t2*eps0) + (fplus*(1.0/weakdirectphase)*t2*eps0);
	amplSum21 = (fminus*weakdirectphase*(1.0/weakmixingphase)*t2*eps1) + (fplus*(1.0/weakdirectphase)*t2*eps1);
 	amplSum22 = (fminus*weakdirectphase*(1.0/weakmixingphase)*t2*eps2) + (fplus*(1.0/weakdirectphase)*t2*eps2);

  }

  // Now set the amplitude

  amp.vertex(0,0,amplSum00);
  report(INFO,"EvtGen") << "00: " << amplSum00 << std::endl;  
  amp.vertex(0,1,amplSum01);
  report(INFO,"EvtGen") << "01: " << amplSum01 << std::endl;
  amp.vertex(0,2,amplSum02);
  report(INFO,"EvtGen") << "02: " << amplSum02 << std::endl;

  amp.vertex(1,0,amplSum10);
  report(INFO,"EvtGen") << "10: " << amplSum10 << std::endl;
  amp.vertex(1,1,amplSum11);
  report(INFO,"EvtGen") << "11: " << amplSum11 << std::endl;
  amp.vertex(1,2,amplSum12);
  report(INFO,"EvtGen") << "12: " << amplSum12 << std::endl;

  amp.vertex(2,0,amplSum20);
  report(INFO,"EvtGen") << "20: " << amplSum20 << std::endl;
  amp.vertex(2,1,amplSum21);
  report(INFO,"EvtGen") << "21: " << amplSum21 << std::endl;
  amp.vertex(2,2,amplSum22);
  report(INFO,"EvtGen") << "22: " << amplSum22 << std::endl;

  return ;

}
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: EvtSVVHelCPMix.cc
	12	//
	13	// Description: Routine to decay scalar -> 2 vectors
	14	// by specifying the helicity amplitudes, taking appropriate
	15	// weak phases into account to get mixing and CP violation through
	16	// interference. Based on EvtSVVHelAmp. Particularly appropriate for
	17	// Bs->J/Psi+Phi
	18	//
	19	// Modification history:
	20	//
	21	// RYD November 24, 1996 EvtSVVHelAmp Module
	22	// CATMORE March 2004 Modified to EvtSVVHelCPMix
	23	//
	24	// Model takes the following as user-specified arguments:
	25	// deltaM, averageM - mass diference and average of light and heavy mass eigenstates (real scalars)
	26	// gamma, deltagamma - average width and width difference of the l and h eigenstates (real scalars)
	27	// delta1, delta2 - strong phases (real scalars)
	28	// direct weak phase (real scalar) (for Bs->JPsiPhi this will be zero)
	29	// weak mixing phase (real scalar) (this is equal to 2*arg(Vts Vtb) for Bs->JPsiPhi)
	30	// Magnitudes of helicity amplitudes as in SVV_HELAMP
	31	// See Phys Rev D 34 p1404 - p1417 and chapters 5 and 7 of Physics Reports 370 p537-680 for more details
	32	//------------------------------------------------------------------------
	33	//
	34	#ifdef WIN32
	35	#pragma warning( disable : 4786 )
	36	// Disable anoying warning about symbol size
	37	#endif
	38	#include <iostream>
	39	#include <fstream>
	40	#include <stdlib.h>
	41	#include <ctype.h>
	42	#include "EvtGenBase/EvtParticle.hh"
	43	#include "EvtGenBase/EvtGenKine.hh"
	44	#include "EvtGenBase/EvtPDL.hh"
	45	#include "EvtGenBase/EvtVector4C.hh"
	46	#include "EvtGenBase/EvtTensor4C.hh"
	47	#include "EvtGenBase/EvtVector3C.hh"
	48	#include "EvtGenBase/EvtVector3R.hh"
	49	#include "EvtGenBase/EvtTensor3C.hh"
	50	#include "EvtGenBase/EvtReport.hh"
	51	#include "EvtGenModels/EvtSVVHelCPMix.hh"
	52	#include "EvtGenBase/EvtId.hh"
	53	#include <string>
	54
	55	EvtSVVHelCPMix::~EvtSVVHelCPMix() {}
	56
	57	std::string EvtSVVHelCPMix::getName(){
	58
	59	return "SVVHELCPMIX";
	60
	61	}
	62
	63
	64	EvtDecayBase* EvtSVVHelCPMix::clone(){
65
66	return new EvtSVVHelCPMix;
67
68	}
69
70	void EvtSVVHelCPMix::init(){
71
72	// check that there are 12 arguments
73	checkNArg(12);
74	checkNDaug(2);
75
76	checkSpinParent(EvtSpinType::SCALAR);
77
78	checkSpinDaughter(0,EvtSpinType::VECTOR);
79	checkSpinDaughter(1,EvtSpinType::VECTOR);
80
81	hp = EvtComplex(getArg(0)cos(getArg(1)),getArg(0)sin(getArg(1)));
82	h0 = EvtComplex(getArg(2)cos(getArg(3)),getArg(2)sin(getArg(3)));
83	hm = EvtComplex(getArg(4)cos(getArg(5)),getArg(4)sin(getArg(5)));
84	averageM = getArg(6);
85	deltaM = getArg(7);
86	gamma = getArg(8);
87	deltagamma = getArg(9);
88	weakmixingphase = EvtComplex(cos(getArg(10)),sin(getArg(10)));
89	weakdirectphase = EvtComplex(cos(getArg(11)),sin(getArg(11)));
90	}
91
92
93	void EvtSVVHelCPMix::initProbMax(){
94
95	setProbMax(getArg(0)getArg(0)+getArg(2)getArg(2)+getArg(4)*getArg(4));
96
97	}
98
99
100	void EvtSVVHelCPMix::decay( EvtParticle *p){
101
102	EvtParticle* parent = p;
103	EvtAmp& amp = _amp2;
104	EvtId n_v1 = getDaug(0);
105	EvtId n_v2 = getDaug(1);
106
107	// Routine to decay a vector into a vector and scalar. Started
108	// by ryd on Oct 17, 1996.
109	// Modified by J.Catmore to take account of CP-violation and mixing
110
111	int tndaug = 2;
112	EvtId tdaug[2];
113	EvtId Bs=EvtPDL::getId("B_s0");
114	EvtId antiBs=EvtPDL::getId("anti-B_s0");
115	tdaug[0] = n_v1;
116	tdaug[1] = n_v2;
117
118	// Phase space and kinematics
119
120	parent->initializePhaseSpace(tndaug,tdaug);
121
122	EvtParticle v1,v2;
123	v1 = parent->getDaug(0);
124	v2 = parent->getDaug(1);
125
126	EvtVector4R momv1 = v1->getP4();
127	EvtVector4R momv2 = v2->getP4();
128
129	EvtVector3R v1dir(momv1.get(1),momv1.get(2),momv1.get(3));
130	v1dir=v1dir/v1dir.d3mag();
131
132	// Definition of quantities used in construction of complex amplitudes:
133
134	EvtTensor3C M; // Tensor as defined in EvtGen manual, equ 117
135	EvtComplex a,b,c; // Helicity amplitudes; EvtGen manual eqns 126-128, also see Phys Lett B 369 p144-150 eqn 15
136	EvtComplex deltamu = EvtComplex(deltaM, -0.5*deltagamma); // See Phys Rev D 34 p1404
137
138	// conversion from times in mm/c to natural units [GeV]^-1
139	double t = ((parent->getLifetime())/2.998e11)*6.58e-25;
140
141	// The following two quantities defined in Phys Rev D 34 p1404
142	EvtComplex fplus = EvtComplex(cos(averageMt),-1.sin(averageMt))exp(-(gamma/2.0)t)
143	(cos(0.5deltaMt)cosh(0.25deltagammat)+EvtComplex(0.0,sin(0.5deltaMt)sinh(0.25deltagammat)));
144	EvtComplex fminus = EvtComplex(cos(averageMt), -1.sin(averageMt))exp(-(gamma/2.0)t)EvtComplex(0.0,1.0)*
145	(sin(0.5deltaMt)cosh(0.25deltagammat)-EvtComplex(0.0,1.0)sinh(0.25deltagammat)cos(0.5deltaM*t));
146
147	// See EvtGen manual pp 106-107
148
149	a=-0.5*(hp+hm);
150	b=EvtComplex(0.0,0.5)*(hp-hm);
151	c=(h0+0.5*(hp+hm));
152
153	M=a*EvtTensor3C::id()+
154	b*eps(v1dir)+
155	c*directProd(v1dir,v1dir);
156
157	EvtVector3C t0=M.cont1(v1->eps(0).vec().conj());
158	EvtVector3C t1=M.cont1(v1->eps(1).vec().conj());
159	EvtVector3C t2=M.cont1(v1->eps(2).vec().conj());
160
161	EvtVector3C eps0=v2->eps(0).vec().conj();
162	EvtVector3C eps1=v2->eps(1).vec().conj();
163	EvtVector3C eps2=v2->eps(2).vec().conj();
164
165	// We need two sets of equations, one for mesons which were in the Bs state at t=0, and another
166	// for those which were in the antiBs state. Each equation consists of a sum of amplitudes - mod-squaring gives the interference terms.
167
168	EvtComplex amplSum00, amplSum01, amplSum02;
169	EvtComplex amplSum10, amplSum11, amplSum12;
170	EvtComplex amplSum20, amplSum21, amplSum22;
171
172	// First the Bs state:
173
174	if (parent->getId()==Bs) {
175
176	amplSum00 = (fplusweakdirectphaset0eps0) + (fminus(1.0/weakdirectphase)weakmixingphaset0*eps0);
177	amplSum01 = (fplusweakdirectphaset0eps1) + (fminus(1.0/weakdirectphase)weakmixingphaset0*eps1);
178	amplSum02 = (fplusweakdirectphaset0eps2) + (fminus(1.0/weakdirectphase)weakmixingphaset0*eps2);
179
180	amplSum10 = (fplusweakdirectphaset1eps0) + (fminus(1.0/weakdirectphase)weakmixingphaset1*eps0);
181	amplSum11 = (fplusweakdirectphaset1eps1) + (fminus(1.0/weakdirectphase)weakmixingphaset1*eps1);
182	amplSum12 = (fplusweakdirectphaset1eps2) + (fminus(1.0/weakdirectphase)weakmixingphaset1*eps2);
183
184	amplSum20 = (fplusweakdirectphaset2eps0) + (fminus(1.0/weakdirectphase)weakmixingphaset2*eps0);
185	amplSum21 = (fplusweakdirectphaset2eps1) + (fminus(1.0/weakdirectphase)weakmixingphaset2*eps1);
186	amplSum22 = (fplusweakdirectphaset2eps2) + (fminus(1.0/weakdirectphase)weakmixingphaset2*eps2);
187	}
188
189	// Now the anti-Bs state:
190
191	if (parent->getId()==antiBs) {
192
193	amplSum00 = (fminusweakdirectphase(1.0/weakmixingphase)t0eps0) + (fplus(1.0/weakdirectphase)t0*eps0);
194	amplSum01 = (fminusweakdirectphase(1.0/weakmixingphase)t0eps1) + (fplus(1.0/weakdirectphase)t0*eps1);
195	amplSum02 = (fminusweakdirectphase(1.0/weakmixingphase)t0eps2) + (fplus(1.0/weakdirectphase)t0*eps2);
196
197	amplSum10 = (fminusweakdirectphase(1.0/weakmixingphase)t1eps0) + (fplus(1.0/weakdirectphase)t1*eps0);
198	amplSum11 = (fminusweakdirectphase(1.0/weakmixingphase)t1eps1) + (fplus(1.0/weakdirectphase)t1*eps1);
199	amplSum12 = (fminusweakdirectphase(1.0/weakmixingphase)t1eps2) + (fplus(1.0/weakdirectphase)t1*eps2);
200
201	amplSum20 = (fminusweakdirectphase(1.0/weakmixingphase)t2eps0) + (fplus(1.0/weakdirectphase)t2*eps0);
202	amplSum21 = (fminusweakdirectphase(1.0/weakmixingphase)t2eps1) + (fplus(1.0/weakdirectphase)t2*eps1);
203	amplSum22 = (fminusweakdirectphase(1.0/weakmixingphase)t2eps2) + (fplus(1.0/weakdirectphase)t2*eps2);
204
205	}
206
207	// Now set the amplitude
208
209	amp.vertex(0,0,amplSum00);
210	report(INFO,"EvtGen") << "00: " << amplSum00 << std::endl;
211	amp.vertex(0,1,amplSum01);
212	report(INFO,"EvtGen") << "01: " << amplSum01 << std::endl;
213	amp.vertex(0,2,amplSum02);
214	report(INFO,"EvtGen") << "02: " << amplSum02 << std::endl;
215
216	amp.vertex(1,0,amplSum10);
217	report(INFO,"EvtGen") << "10: " << amplSum10 << std::endl;
218	amp.vertex(1,1,amplSum11);
219	report(INFO,"EvtGen") << "11: " << amplSum11 << std::endl;
220	amp.vertex(1,2,amplSum12);
221	report(INFO,"EvtGen") << "12: " << amplSum12 << std::endl;
222
223	amp.vertex(2,0,amplSum20);
224	report(INFO,"EvtGen") << "20: " << amplSum20 << std::endl;
225	amp.vertex(2,1,amplSum21);
226	report(INFO,"EvtGen") << "21: " << amplSum21 << std::endl;
227	amp.vertex(2,2,amplSum22);
228	report(INFO,"EvtGen") << "22: " << amplSum22 << std::endl;
229
230	return ;
231
232	}
233
234