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EvtLambdaB2LambdaV.cpp
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EvtLambdaB2LambdaV.cpp
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/***********************************************************************
* Copyright 1998-2020 CERN for the benefit of the EvtGen authors *
* *
* This file is part of EvtGen. *
* *
* EvtGen is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* EvtGen is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with EvtGen. If not, see <https://www.gnu.org/licenses/>. *
***********************************************************************/
#include "EvtGenModels/EvtLambdaB2LambdaV.hh"
#include "EvtGenBase/EvtGenKine.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtPatches.hh"
#include "EvtGenBase/EvtRandom.hh"
#include "EvtGenBase/EvtReport.hh"
#include <fstream>
#include <stdio.h>
#include <stdlib.h>
#include <string>
using std::fstream;
//************************************************************************
//* *
//* Class EvtLambdaB2LambdaV *
//* *
//************************************************************************
//DECLARE_COMPONENT( EvtLambdaB2LambdaV );
EvtLambdaB2LambdaV::EvtLambdaB2LambdaV()
{
//set facility name
fname = "EvtGen.EvtLambdaB2LambdaV";
}
//------------------------------------------------------------------------
// Method 'getName'
//------------------------------------------------------------------------
std::string EvtLambdaB2LambdaV::getName()
{
return "LAMBDAB2LAMBDAV";
}
//------------------------------------------------------------------------
// Method 'clone'
//------------------------------------------------------------------------
EvtDecayBase* EvtLambdaB2LambdaV::clone()
{
return new EvtLambdaB2LambdaV;
}
//------------------------------------------------------------------------
// Method 'initProbMax'
//------------------------------------------------------------------------
void EvtLambdaB2LambdaV::initProbMax()
{
//maximum (case where C=0)
double Max = 1 + fabs( A * B );
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " PDF max value : " << Max << std::endl;
setProbMax( Max );
}
//------------------------------------------------------------------------
// Method 'init'
//------------------------------------------------------------------------
void EvtLambdaB2LambdaV::init()
{
bool antiparticle = false;
//introduction
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< "*************************************************" << std::endl;
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< "* Event Model Class : EvtLambdaB2LambdaV *" << std::endl;
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< "*************************************************" << std::endl;
//check the number of arguments
checkNArg( 2 );
//check the number of daughters
checkNDaug( 2 );
const EvtId Id_mother = getParentId();
const EvtId Id_daug1 = getDaug( 0 );
const EvtId Id_daug2 = getDaug( 1 );
//lambdab identification
if ( Id_mother == EvtPDL::getId( "Lambda_b0" ) ) {
antiparticle = false;
} else if ( Id_mother == EvtPDL::getId( "anti-Lambda_b0" ) ) {
antiparticle = true;
} else {
EvtGenReport( EVTGEN_ERROR, fname.c_str() )
<< " Mother is not a Lambda_b0 or an anti-Lambda_b0, but a "
<< EvtPDL::name( Id_mother ) << std::endl;
abort();
}
//lambda
if ( !( Id_daug1 == EvtPDL::getId( "Lambda0" ) && !antiparticle ) &&
!( Id_daug1 == EvtPDL::getId( "anti-Lambda0" ) && antiparticle ) ) {
if ( !antiparticle ) {
EvtGenReport( EVTGEN_ERROR, fname.c_str() )
<< " Daughter1 is not a Lambda0, but a "
<< EvtPDL::name( Id_daug1 ) << std::endl;
} else {
EvtGenReport( EVTGEN_ERROR, fname.c_str() )
<< " Daughter1 is not an anti-Lambda0, but a "
<< EvtPDL::name( Id_daug1 ) << std::endl;
}
abort();
}
//identification meson V
if ( getArg( 1 ) == 1 )
Vtype = VID::JPSI;
else if ( getArg( 1 ) == 2 )
Vtype = VID::RHO;
else if ( getArg( 1 ) == 3 )
Vtype = VID::OMEGA;
else if ( getArg( 1 ) == 4 )
Vtype = VID::RHO_OMEGA_MIXING;
else {
EvtGenReport( EVTGEN_ERROR, fname.c_str() )
<< " Vtype " << getArg( 1 ) << " is unknown" << std::endl;
abort();
}
//check vector meson V
if ( Id_daug2 == EvtPDL::getId( "J/psi" ) && Vtype == VID::JPSI ) {
if ( !antiparticle )
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Decay mode successfully initialized : Lambda_b0 -> Lambda J/psi"
<< std::endl;
else
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Decay mode successfully initialized : anti-Lambda_b0 -> anti-Lambda J/psi"
<< std::endl;
} else if ( Id_daug2 == EvtPDL::getId( "rho0" ) && Vtype == VID::RHO ) {
if ( !antiparticle )
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Decay mode successfully initialized : Lambda_b0 -> Lambda rho0"
<< std::endl;
else
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Decay mode successfully initialized : anti-Lambda_b0 -> anti-Lambda rho0"
<< std::endl;
} else if ( Id_daug2 == EvtPDL::getId( "omega" ) && Vtype == VID::OMEGA ) {
if ( !antiparticle )
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Decay mode successfully initialized : Lambda_b0 -> Lambda omega"
<< std::endl;
else
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Decay mode successfully initialized : anti-Lambda_b0 -> anti-Lambda omega"
<< std::endl;
} else if ( ( Id_daug2 == EvtPDL::getId( "omega" ) ||
Id_daug2 == EvtPDL::getId( "rho0" ) ) &&
Vtype == VID::RHO_OMEGA_MIXING ) {
if ( !antiparticle )
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Decay mode successfully initialized : "
<< "Lambda_b0 -> Lambda rho-omega-mixing" << std::endl;
else
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Decay mode successfully initialized : "
<< "anti-Lambda_b0 -> anti-Lambda rho-omega-mixing" << std::endl;
}
else {
EvtGenReport( EVTGEN_ERROR, fname.c_str() )
<< " Daughter2 is not a J/psi, phi or rho0 but a "
<< EvtPDL::name( Id_daug2 ) << std::endl;
abort();
}
//fix dynamics parameters
B = (double)getArg( 0 );
C = EvtComplex( ( sqrt( 2. ) / 2. ), ( sqrt( 2. ) / 2. ) );
switch ( Vtype ) {
case VID::JPSI:
A = 0.490;
break;
case VID::RHO:
case VID::OMEGA:
case VID::RHO_OMEGA_MIXING:
A = 0.194;
break;
default:
A = 0;
break;
}
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " LambdaB decay parameters : " << std::endl;
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " - lambda asymmetry A = " << A << std::endl;
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " - lambdab polarisation B = " << B << std::endl;
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " - lambdab density matrix rho+- C = " << C << std::endl;
}
//------------------------------------------------------------------------
// Method 'decay'
//------------------------------------------------------------------------
void EvtLambdaB2LambdaV::decay( EvtParticle* lambdab )
{
lambdab->makeDaughters( getNDaug(), getDaugs() );
//get lambda and V particles
EvtParticle* lambda = lambdab->getDaug( 0 );
EvtParticle* V = lambdab->getDaug( 1 );
//get resonance masses
// - LAMBDAB -> mass given by the preceding class
// - LAMBDA -> nominal mass
// - V -> getVmass method
double MASS_LAMBDAB = lambdab->mass();
double MASS_LAMBDA = EvtPDL::getMeanMass( EvtPDL::getId( "Lambda0" ) );
double MASS_V = getVMass( MASS_LAMBDAB, MASS_LAMBDA );
//generate random angles
double phi = EvtRandom::Flat( 0, 2 * EvtConst::pi );
double theta = acos( EvtRandom::Flat( -1, +1 ) );
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Angular angles : theta = " << theta << " ; phi = " << phi
<< std::endl;
//computate resonance quadrivectors
double E_lambda = ( MASS_LAMBDAB * MASS_LAMBDAB +
MASS_LAMBDA * MASS_LAMBDA - MASS_V * MASS_V ) /
( 2 * MASS_LAMBDAB );
double E_V = ( MASS_LAMBDAB * MASS_LAMBDAB + MASS_V * MASS_V -
MASS_LAMBDA * MASS_LAMBDA ) /
( 2 * MASS_LAMBDAB );
double P = sqrt( E_lambda * E_lambda - lambda->mass() * lambda->mass() );
EvtVector4R P_lambdab = lambdab->getP4();
double px = P_lambdab.get( 1 );
double py = P_lambdab.get( 2 );
double pz = P_lambdab.get( 3 );
double E = P_lambdab.get( 0 );
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< "E of lambdab: " << P_lambdab.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< "E of lambdab: " << E << std::endl;
EvtVector4R q_lambdab2( E,
( ( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) ) *
( ( px * ( px ) ) + ( py * ( py ) ) ) ),
( ( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) ) *
( -( ( py ) * ( px ) ) + ( px * ( py ) ) ) ),
( pz ) );
EvtVector4R q_lambdab3( E, q_lambdab2.get( 3 ), q_lambdab2.get( 1 ),
q_lambdab2.get( 2 ) );
EvtVector4R q_lambda0( E_lambda, P * sin( theta ) * cos( phi ),
P * sin( theta ) * sin( phi ), P * cos( theta ) );
EvtVector4R q_V0( E_V, -P * sin( theta ) * cos( phi ),
-P * sin( theta ) * sin( phi ), -P * cos( theta ) );
EvtVector4R q_lambda1( E_lambda, q_lambda0.get( 2 ), q_lambda0.get( 3 ),
q_lambda0.get( 1 ) );
EvtVector4R q_V1( E_V, q_V0.get( 2 ), q_V0.get( 3 ), q_V0.get( 1 ) );
EvtVector4R q_lambda(
E_lambda,
( ( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) ) *
( ( px * ( q_lambda1.get( 1 ) ) ) - ( py * ( q_lambda1.get( 2 ) ) ) ) ),
( ( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) ) *
( ( py * ( q_lambda1.get( 1 ) ) ) + ( px * ( q_lambda1.get( 2 ) ) ) ) ),
( q_lambda1.get( 3 ) ) );
EvtVector4R q_V(
E_V,
( ( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) ) *
( ( px * ( q_V1.get( 1 ) ) ) - ( py * ( q_V1.get( 2 ) ) ) ) ),
( ( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) ) *
( ( py * ( q_V1.get( 1 ) ) ) + ( px * ( q_V1.get( 2 ) ) ) ) ),
( q_V1.get( 3 ) ) );
lambda->getP4();
V->getP4();
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " LambdaB px: " << px << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " LambdaB py: " << py << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " LambdaB pz: " << pz << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " LambdaB E: " << E << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab3 E: " << q_lambdab3.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 0 px: " << q_lambda0.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 0 py: " << q_lambda0.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 0 pz: " << q_lambda0.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 0 E: " << q_lambda0.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 1 px: " << q_lambda1.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 1 py: " << q_lambda1.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 1 pz: " << q_lambda1.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 1 E: " << q_lambda1.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda px: " << q_lambda.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda py: " << q_lambda.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda pz: " << q_lambda.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda E: " << q_lambda0.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 0 px: " << q_V0.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 0 py: " << q_V0.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 0 pz: " << q_V0.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 0 E: " << q_V0.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 1 px: " << q_V1.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 1 py: " << q_V1.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 1 pz: " << q_V1.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 1 E: " << q_V1.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V px: " << q_V.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V py: " << q_V.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V pz: " << q_V.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V E: " << q_V0.get( 3 ) << std::endl;
//set quadrivectors to particles
lambda->init( getDaugs()[0], q_lambda );
V->init( getDaugs()[1], q_V );
//computate pdf
double pdf = 1 + A * B * cos( theta ) +
2 * A * real( C * EvtComplex( cos( phi ), sin( phi ) ) ) *
sin( theta );
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " LambdaB decay pdf value : " << pdf << std::endl;
//set probability
setProb( pdf );
return;
}
//------------------------------------------------------------------------
// Method 'BreitWignerRelPDF'
//------------------------------------------------------------------------
double EvtLambdaB2LambdaV::BreitWignerRelPDF( double m, double _m0, double _g0 )
{
double a = ( _m0 * _g0 ) * ( _m0 * _g0 );
double b = ( m * m - _m0 * _m0 ) * ( m * m - _m0 * _m0 );
return a / ( b + a );
}
//------------------------------------------------------------------------
// Method 'RhoOmegaMixingPDF'
//------------------------------------------------------------------------
double EvtLambdaB2LambdaV::RhoOmegaMixingPDF( double m, double _mr, double _gr,
double _mo, double _go )
{
double a = m * m - _mr * _mr;
double b = m * m - _mo * _mo;
double c = _gr * _mr;
double d = _go * _mo;
double re_pi = -3500e-6; //GeV^2
double im_pi = -300e-6; //GeV^2
double va_pi = re_pi + im_pi;
//computate pdf value
double f = 1 / ( a * a + c * c ) *
( 1 + ( va_pi * va_pi + 2 * b * re_pi + 2 * d * im_pi ) /
( b * b + d * d ) );
//computate pdf max value
a = 0;
b = _mr * _mr - _mo * _mo;
double maxi = 1 / ( a * a + c * c ) *
( 1 + ( va_pi * va_pi + 2 * b * re_pi + 2 * d * im_pi ) /
( b * b + d * d ) );
return f / maxi;
}
//------------------------------------------------------------------------
// Method 'getVMass'
//------------------------------------------------------------------------
double EvtLambdaB2LambdaV::getVMass( double MASS_LAMBDAB, double MASS_LAMBDA )
{
//JPSI case
if ( Vtype == VID::JPSI ) {
return EvtPDL::getMass( EvtPDL::getId( "J/psi" ) );
}
//RHO,OMEGA,MIXING case
else {
//parameters
double MASS_RHO = EvtPDL::getMeanMass( EvtPDL::getId( "rho0" ) );
double MASS_OMEGA = EvtPDL::getMeanMass( EvtPDL::getId( "omega" ) );
double WIDTH_RHO = EvtPDL::getWidth( EvtPDL::getId( "rho0" ) );
double WIDTH_OMEGA = EvtPDL::getWidth( EvtPDL::getId( "omega" ) );
double MASS_PION = EvtPDL::getMeanMass( EvtPDL::getId( "pi-" ) );
double _max = MASS_LAMBDAB - MASS_LAMBDA;
double _min = 2 * MASS_PION;
double mass = 0;
bool test = false;
int ntimes = 10000;
do {
double y = EvtRandom::Flat( 0, 1 );
//generate mass
mass = ( _max - _min ) * EvtRandom::Flat( 0, 1 ) + _min;
//pdf calculate
double f = 0;
switch ( Vtype ) {
case VID::RHO:
f = BreitWignerRelPDF( mass, MASS_RHO, WIDTH_RHO );
break;
case VID::OMEGA:
f = BreitWignerRelPDF( mass, MASS_OMEGA, WIDTH_OMEGA );
break;
case VID::RHO_OMEGA_MIXING:
f = RhoOmegaMixingPDF( mass, MASS_RHO, WIDTH_RHO,
MASS_OMEGA, WIDTH_OMEGA );
break;
default:
f = 1;
break;
}
ntimes--;
if ( y < f )
test = true;
} while ( ntimes && !test );
//looping 10000 times
if ( ntimes == 0 ) {
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< "Tried accept/reject:10000"
<< " times, and rejected all the times!" << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< "Is therefore accepting the last event!" << std::endl;
}
//return V particle mass
return mass;
}
}
//************************************************************************
//* *
//* Class EvtLambda2PPiForLambdaB2LambdaV *
//* *
//************************************************************************
//------------------------------------------------------------------------
// Constructor
//------------------------------------------------------------------------
EvtLambda2PPiForLambdaB2LambdaV::EvtLambda2PPiForLambdaB2LambdaV()
{
//set facility name
fname = "EvtGen.EvtLambda2PPiForLambdaB2LambdaV";
}
//------------------------------------------------------------------------
// Method 'getName'
//------------------------------------------------------------------------
std::string EvtLambda2PPiForLambdaB2LambdaV::getName()
{
return "LAMBDA2PPIFORLAMBDAB2LAMBDAV";
}
//------------------------------------------------------------------------
// Method 'clone'
//------------------------------------------------------------------------
EvtDecayBase* EvtLambda2PPiForLambdaB2LambdaV::clone()
{
return new EvtLambda2PPiForLambdaB2LambdaV;
}
//------------------------------------------------------------------------
// Method 'initProbMax'
//------------------------------------------------------------------------
void EvtLambda2PPiForLambdaB2LambdaV::initProbMax()
{
//maximum (case where D is real)
double Max = 0;
if ( A == 0 )
Max = 1;
else if ( C == 0 || real( D ) == 0 )
Max = 1 + fabs( A * B );
else if ( B == 0 )
Max = 1 + EvtConst::pi / 2.0 * fabs( C * A * real( D ) );
else {
double theta_max = atan( -EvtConst::pi / 2.0 * C * real( D ) / B );
double max1 = 1 + fabs( A * B * cos( theta_max ) -
EvtConst::pi / 2.0 * C * A * real( D ) *
sin( theta_max ) );
double max2 = 1 + fabs( A * B );
if ( max1 > max2 )
Max = max1;
else
Max = max2;
}
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " PDF max value : " << Max << std::endl;
setProbMax( Max );
}
//------------------------------------------------------------------------
// Method 'init'
//------------------------------------------------------------------------
void EvtLambda2PPiForLambdaB2LambdaV::init()
{
bool antiparticle = false;
//introduction
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " ***********************************************************"
<< std::endl;
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " * Event Model Class : EvtLambda2PPiForLambdaB2LambdaV *"
<< std::endl;
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " ***********************************************************"
<< std::endl;
//check the number of arguments
checkNArg( 2 );
//check the number of daughters
checkNDaug( 2 );
const EvtId Id_mother = getParentId();
const EvtId Id_daug1 = getDaug( 0 );
const EvtId Id_daug2 = getDaug( 1 );
//lambda identification
if ( Id_mother == EvtPDL::getId( "Lambda0" ) ) {
antiparticle = false;
} else if ( Id_mother == EvtPDL::getId( "anti-Lambda0" ) ) {
antiparticle = true;
} else {
EvtGenReport( EVTGEN_ERROR, fname.c_str() )
<< " Mother is not a Lambda0 or an anti-Lambda0, but a "
<< EvtPDL::name( Id_mother ) << std::endl;
abort();
}
//proton identification
if ( !( Id_daug1 == EvtPDL::getId( "p+" ) && !antiparticle ) &&
!( Id_daug1 == EvtPDL::getId( "anti-p-" ) && antiparticle ) ) {
if ( !antiparticle ) {
EvtGenReport( EVTGEN_ERROR, fname.c_str() )
<< " Daughter1 is not a p+, but a " << EvtPDL::name( Id_daug1 )
<< std::endl;
} else {
EvtGenReport( EVTGEN_ERROR, fname.c_str() )
<< " Daughter1 is not an anti-p-, but a "
<< EvtPDL::name( Id_daug1 ) << std::endl;
}
abort();
}
//pion identification
if ( !( Id_daug2 == EvtPDL::getId( "pi-" ) && !antiparticle ) &&
!( Id_daug2 == EvtPDL::getId( "pi+" ) && antiparticle ) ) {
if ( !antiparticle ) {
EvtGenReport( EVTGEN_ERROR, fname.c_str() )
<< " Daughter2 is not a p-, but a " << EvtPDL::name( Id_daug1 )
<< std::endl;
} else {
EvtGenReport( EVTGEN_ERROR, fname.c_str() )
<< " Daughter2 is not an p+, but a " << EvtPDL::name( Id_daug1 )
<< std::endl;
}
abort();
}
if ( !antiparticle )
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Decay mode successfully initialized : Lambda0 -> p+ pi-"
<< std::endl;
else
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Decay mode successfully initialized : Anti-Lambda0 -> anti-p- pi+"
<< std::endl;
//identification meson V
if ( getArg( 1 ) == 1 ) {
Vtype = VID::JPSI;
if ( !antiparticle )
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " From : Lambda_b0 -> Lambda J/psi" << std::endl;
else
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " From : anti-Lambda_b0 -> anti-Lambda J/psi" << std::endl;
} else if ( getArg( 1 ) == 2 ) {
Vtype = VID::RHO;
if ( !antiparticle )
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " From : Lambda_b0 -> Lambda rho0" << std::endl;
else
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " From : anti-Lambda_b0 -> anti-Lambda rho0" << std::endl;
} else if ( getArg( 1 ) == 3 ) {
Vtype = VID::OMEGA;
if ( !antiparticle )
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " From : Lambda_b0 -> Lambda omega" << std::endl;
else
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " From : anti-Lambda_b0 -> anti-Lambda omega" << std::endl;
} else if ( getArg( 1 ) == 4 ) {
Vtype = VID::RHO_OMEGA_MIXING;
} else {
EvtGenReport( EVTGEN_ERROR, fname.c_str() )
<< " Vtype " << getArg( 1 ) << " is unknown" << std::endl;
if ( !antiparticle ) {
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " From : Lambda_b0 -> Lambda rho-omega-mixing" << std::endl;
} else {
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " From : anti-Lambda_b0 -> anti-Lambda rho-omega-mixing"
<< std::endl;
}
abort();
}
//constants
A = 0.642;
C = (double)getArg( 0 );
switch ( Vtype ) {
case VID::JPSI:
B = -0.167;
D = EvtComplex( 0.25, 0.0 );
break;
case VID::RHO:
case VID::OMEGA:
case VID::RHO_OMEGA_MIXING:
B = -0.21;
D = EvtComplex( 0.31, 0.0 );
break;
default:
B = 0;
D = EvtComplex( 0, 0 );
break;
}
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Lambda decay parameters : " << std::endl;
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " - proton asymmetry A = " << A << std::endl;
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " - lambda polarisation B = " << B << std::endl;
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " - lambdaB polarisation C = " << C << std::endl;
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " - lambda density matrix rho+- D = " << D << std::endl;
}
//------------------------------------------------------------------------
// Method 'decay'
//------------------------------------------------------------------------
void EvtLambda2PPiForLambdaB2LambdaV::decay( EvtParticle* lambda )
{
lambda->makeDaughters( getNDaug(), getDaugs() );
//get proton and pion particles
EvtParticle* proton = lambda->getDaug( 0 );
EvtParticle* pion = lambda->getDaug( 1 );
//get resonance masses
// - LAMBDA -> mass given by EvtLambdaB2LambdaV class
// - PROTON & PION -> nominal mass
double MASS_LAMBDA = lambda->mass();
double MASS_PROTON = EvtPDL::getMeanMass( EvtPDL::getId( "p+" ) );
double MASS_PION = EvtPDL::getMeanMass( EvtPDL::getId( "pi-" ) );
//generate random angles
double phi = EvtRandom::Flat( 0, 2 * EvtConst::pi );
double theta = acos( EvtRandom::Flat( -1, +1 ) );
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Angular angles : theta = " << theta << " ; phi = " << phi
<< std::endl;
//computate resonance quadrivectors
double E_proton = ( MASS_LAMBDA * MASS_LAMBDA + MASS_PROTON * MASS_PROTON -
MASS_PION * MASS_PION ) /
( 2 * MASS_LAMBDA );
double E_pion = ( MASS_LAMBDA * MASS_LAMBDA + MASS_PION * MASS_PION -
MASS_PROTON * MASS_PROTON ) /
( 2 * MASS_LAMBDA );
double P = sqrt( E_proton * E_proton - proton->mass() * proton->mass() );
EvtVector4R P_lambda = lambda->getP4();
EvtParticle* Mother_lambda = lambda->getParent();
EvtVector4R lambdab = Mother_lambda->getP4();
double E_lambda = P_lambda.get( 0 );
double px_M = lambdab.get( 1 );
double py_M = lambdab.get( 2 );
double pz_M = lambdab.get( 3 );
double E_M = lambdab.get( 0 );
EvtVector4R q_lambdab2(
E_M,
( ( 1 / ( sqrt( pow( px_M, 2 ) + pow( py_M, 2 ) ) ) ) *
( ( px_M * ( px_M ) ) + ( py_M * ( py_M ) ) ) ),
( ( 1 / ( sqrt( pow( px_M, 2 ) + pow( py_M, 2 ) ) ) ) *
( -( ( py_M ) * ( px_M ) ) + ( px_M * ( py_M ) ) ) ),
( pz_M ) );
EvtVector4R q_lambdab3( E_M, q_lambdab2.get( 3 ), q_lambdab2.get( 1 ),
q_lambdab2.get( 2 ) );
EvtVector4R q_lambda1( E_lambda,
( ( 1 / ( sqrt( pow( px_M, 2 ) + pow( py_M, 2 ) ) ) ) *
( ( px_M * ( P_lambda.get( 1 ) ) ) +
( py_M * ( P_lambda.get( 2 ) ) ) ) ),
( ( 1 / ( sqrt( pow( px_M, 2 ) + pow( py_M, 2 ) ) ) ) *
( -( py_M * ( P_lambda.get( 1 ) ) ) +
( px_M * ( P_lambda.get( 2 ) ) ) ) ),
P_lambda.get( 3 ) );
EvtVector4R q_lambda2( E_lambda, q_lambda1.get( 3 ), q_lambda1.get( 1 ),
q_lambda1.get( 2 ) );
double px = q_lambda2.get( 1 );
double py = q_lambda2.get( 2 );
double pz = q_lambda2.get( 3 );
EvtVector4R q_lambda4(
q_lambda2.get( 0 ),
( ( 1 / ( sqrt( pow( q_lambda2.get( 1 ), 2 ) + pow( q_lambda2.get( 2 ), 2 ) +
pow( q_lambda2.get( 3 ), 2 ) ) ) ) *
( 1 / ( sqrt( pow( q_lambda2.get( 1 ), 2 ) +
pow( q_lambda2.get( 2 ), 2 ) ) ) ) *
( ( q_lambda2.get( 1 ) ) * ( q_lambda2.get( 1 ) ) *
( q_lambda2.get( 3 ) ) +
( ( q_lambda2.get( 2 ) ) * ( q_lambda2.get( 2 ) ) *
( q_lambda2.get( 3 ) ) ) -
( ( q_lambda2.get( 3 ) ) * ( pow( q_lambda2.get( 1 ), 2 ) +
pow( q_lambda2.get( 2 ), 2 ) ) ) ) ),
( ( ( ( q_lambda2.get( 2 ) ) * ( q_lambda2.get( 1 ) ) ) -
( ( q_lambda2.get( 1 ) ) * ( q_lambda2.get( 2 ) ) ) ) /
( sqrt( pow( q_lambda2.get( 1 ), 2 ) + pow( q_lambda2.get( 2 ), 2 ) ) ) ),
( ( ( 1 / sqrt( pow( q_lambda2.get( 1 ), 2 ) + pow( q_lambda2.get( 2 ), 2 ) +
pow( q_lambda2.get( 3 ), 2 ) ) ) *
( ( ( q_lambda2.get( 1 ) ) * ( q_lambda2.get( 1 ) ) ) +
( ( q_lambda2.get( 2 ) ) * ( q_lambda2.get( 2 ) ) ) +
( ( q_lambda2.get( 3 ) ) * ( q_lambda2.get( 3 ) ) ) ) ) ) );
EvtVector4R q_proton1( E_proton, P * sin( theta ) * cos( phi ),
P * sin( theta ) * sin( phi ), P * cos( theta ) );
EvtVector4R q_pion1( E_pion, -P * sin( theta ) * cos( phi ),
-P * sin( theta ) * sin( phi ), -P * cos( theta ) );
EvtVector4R q_proton3(
E_proton,
( ( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) *
( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) ) *
( ( q_proton1.get( 1 ) ) * ( px ) * ( pz ) -
( ( q_proton1.get( 2 ) ) * ( py ) *
( ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) ) +
( ( ( q_proton1.get( 3 ) ) ) *
( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) * ( px ) ) ) ),
( ( ( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) ) *
( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) ) *
( ( ( q_proton1.get( 1 ) ) ) * ( py ) * ( pz ) +
( ( q_proton1.get( 2 ) ) * ( px ) *
( ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) ) +
( ( ( q_proton1.get( 3 ) ) ) *
( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) * ( py ) ) ) ),
( ( ( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) ) *
( ( -( q_proton1.get( 1 ) ) ) *
( ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) ) +
( ( q_proton1.get( 3 ) ) * ( pz ) ) ) ) );
EvtVector4R q_pion3(
E_pion,
( ( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) *
( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) ) *
( ( q_pion1.get( 1 ) ) * ( px ) * ( pz ) -
( ( q_pion1.get( 2 ) ) * ( py ) *
( ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) ) +
( ( ( q_pion1.get( 3 ) ) ) *
( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) * ( px ) ) ) ),
( ( ( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) ) *
( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) ) *
( ( q_pion1.get( 1 ) ) * ( py ) * ( pz ) +
( ( q_pion1.get( 2 ) ) * ( px ) *
( ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) ) +
( ( ( q_pion1.get( 3 ) ) ) *
( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) * ( py ) ) ) ),
( ( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) *
( ( -( q_pion1.get( 1 ) ) ) * ( ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) ) +
( ( q_pion1.get( 3 ) ) * ( pz ) ) ) ) );
EvtVector4R q_proton5( q_proton3.get( 0 ), ( q_proton3.get( 2 ) ),
( q_proton3.get( 3 ) ), ( q_proton3.get( 1 ) ) );
EvtVector4R q_pion5( q_pion3.get( 0 ), ( q_pion3.get( 2 ) ),
( q_pion3.get( 3 ) ), ( q_pion3.get( 1 ) ) );
EvtVector4R q_proton( q_proton5.get( 0 ),
( ( 1 / ( sqrt( pow( px_M, 2 ) + pow( py_M, 2 ) ) ) ) *
( ( px_M * ( q_proton5.get( 1 ) ) ) -
( py_M * ( q_proton5.get( 2 ) ) ) ) ),
( ( 1 / ( sqrt( pow( px_M, 2 ) + pow( py_M, 2 ) ) ) ) *
( ( py_M * ( q_proton5.get( 1 ) ) ) +
( px_M * ( q_proton5.get( 2 ) ) ) ) ),
( q_proton5.get( 3 ) ) );
EvtVector4R q_pion(
q_pion5.get( 0 ),
( ( 1 / ( sqrt( pow( px_M, 2 ) + pow( py_M, 2 ) ) ) ) *
( ( px_M * ( q_pion5.get( 1 ) ) ) - ( py_M * ( q_pion5.get( 2 ) ) ) ) ),
( ( 1 / ( sqrt( pow( px_M, 2 ) + pow( py_M, 2 ) ) ) ) *
( ( py_M * ( q_pion5.get( 1 ) ) ) + ( px_M * ( q_pion5.get( 2 ) ) ) ) ),
( q_pion5.get( 3 ) ) );
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab px: " << px_M << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab py: " << py_M << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab pz: " << pz_M << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab E: " << E_M << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab2 px: " << q_lambdab2.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab2 py: " << q_lambdab2.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab2 pz: " << q_lambdab2.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab2 E: " << q_lambdab2.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab3 px: " << q_lambdab3.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab3 py: " << q_lambdab3.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab3 pz: " << q_lambdab3.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab3 E: " << q_lambdab3.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 0 px: " << P_lambda.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 0 py: " << P_lambda.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 0 pz: " << P_lambda.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 0 E: " << P_lambda.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 1 px: " << q_lambda1.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 1 py: " << q_lambda1.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 1 pz: " << q_lambda1.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 1 E: " << q_lambda1.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 2 px: " << q_lambda2.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 2 py: " << q_lambda2.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 2 pz: " << q_lambda2.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda 2 E: " << q_lambda2.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda px: " << px << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda py: " << py << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambda pz: " << pz << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " pion 1 px: " << q_pion1.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " pion 1 py: " << q_pion1.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " pion 1 pz: " << q_pion1.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " pion 1 E: " << q_pion1.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " pion 3 px: " << q_pion3.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " pion 3 px: " << q_pion3.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " pion 3 py: " << q_pion3.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " pion 3 pz: " << q_pion3.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " pion 3 E: " << q_pion3.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " pion 5 px: " << q_pion5.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " pion 5 py: " << q_pion5.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " pion 5 pz: " << q_pion5.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " pion 5 E: " << q_pion5.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " proton 1 px: " << q_proton1.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " proton 1 py: " << q_proton1.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " proton 1 pz: " << q_proton1.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " proton 1 E: " << q_proton1.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " proton 3 px: " << q_proton3.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " proton 3 py: " << q_proton3.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " proton 3 pz: " << q_proton3.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " proton 3 E: " << q_proton3.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " proton 5 px: " << q_proton5.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " proton 5 py: " << q_proton5.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " proton 5 pz: " << q_proton5.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " proton 5 E: " << q_proton5.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " proton px: " << q_proton.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " proton py: " << q_proton.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< "proton pz: " << q_proton.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " pion px: " << q_pion.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " pion py: " << q_pion.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " pion pz: " << q_pion.get( 3 ) << std::endl;
;
///////////*******NEW********//////////////////////
//set quadrivectors to particles
proton->init( getDaugs()[0], q_proton );
pion->init( getDaugs()[1], q_pion );
//computate pdf
//double pdf = 1 + A*B*cos(theta) - EvtConst::pi/2.0*C*A*real(D*EvtComplex(cos(phi),sin(phi)))*sin(theta);
double pdf = 1 + A * B * cos( theta ) +
2 * A * real( D * EvtComplex( cos( phi ), sin( phi ) ) ) *
sin( theta );
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Lambda decay pdf value : " << pdf << std::endl;
//set probability
setProb( pdf );
return;
}
//************************************************************************
//* *
//* Class EvtLambda2PPiForLambdaB2LambdaV *
//* *
//************************************************************************
//------------------------------------------------------------------------
// Constructor
//------------------------------------------------------------------------
EvtV2VpVmForLambdaB2LambdaV::EvtV2VpVmForLambdaB2LambdaV()
{
//set facility name
fname = "EvtGen.EvtV2VpVmForLambdaB2LambdaV";
}
//------------------------------------------------------------------------
// Method 'getName'
//------------------------------------------------------------------------
std::string EvtV2VpVmForLambdaB2LambdaV::getName()
{
return "V2VPVMFORLAMBDAB2LAMBDAV";
}
//------------------------------------------------------------------------
// Method 'clone'
//------------------------------------------------------------------------
EvtDecayBase* EvtV2VpVmForLambdaB2LambdaV::clone()
{
return new EvtV2VpVmForLambdaB2LambdaV;
}
//------------------------------------------------------------------------
// Method 'initProbMax'
//------------------------------------------------------------------------
void EvtV2VpVmForLambdaB2LambdaV::initProbMax()
{
//maximum
double Max = 0;
if ( Vtype == VID::JPSI ) {
if ( ( 1 - 3 * A ) > 0 )
Max = 2 * ( 1 - A );
else
Max = 1 + A;
} else {
if ( ( 3 * A - 1 ) >= 0 )
Max = 2 * A;
else
Max = 1 - A;
}
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " PDF max value : " << Max << std::endl;
setProbMax( Max );
}
//------------------------------------------------------------------------
// Method 'init'
//------------------------------------------------------------------------
void EvtV2VpVmForLambdaB2LambdaV::init()
{
//introduction
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " ***********************************************************"
<< std::endl;
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " * Event Model Class : EvtV2VpVmForLambdaB2LambdaV *"
<< std::endl;
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " ***********************************************************"
<< std::endl;
//check the number of arguments
checkNArg( 2 );
//check the number of daughters
checkNDaug( 2 );
const EvtId Id_mother = getParentId();
const EvtId Id_daug1 = getDaug( 0 );
const EvtId Id_daug2 = getDaug( 1 );
//identification meson V
if ( getArg( 1 ) == 1 )
Vtype = VID::JPSI;
else if ( getArg( 1 ) == 2 )
Vtype = VID::RHO;
else if ( getArg( 1 ) == 3 )
Vtype = VID::OMEGA;
else if ( getArg( 1 ) == 4 )
Vtype = VID::RHO_OMEGA_MIXING;
else {
EvtGenReport( EVTGEN_ERROR, fname.c_str() )
<< " Vtype " << getArg( 1 ) << " is unknown" << std::endl;
abort();
}
//vector meson V
if ( Id_mother == EvtPDL::getId( "J/psi" ) && Vtype == VID::JPSI ) {
} else if ( Id_mother == EvtPDL::getId( "omega" ) && Vtype == VID::OMEGA ) {
} else if ( Id_mother == EvtPDL::getId( "rho0" ) && Vtype == VID::RHO ) {
} else if ( ( Id_mother == EvtPDL::getId( "rho0" ) ||
Id_mother == EvtPDL::getId( "omega" ) ) &&
Vtype == VID::RHO_OMEGA_MIXING ) {
} else {
EvtGenReport( EVTGEN_ERROR, fname.c_str() )
<< " Mother is not a J/psi, phi or rho0 but a "
<< EvtPDL::name( Id_mother ) << std::endl;
abort();
}
//daughters for each V possibility
switch ( Vtype ) {
case VID::JPSI:
if ( Id_daug1 != EvtPDL::getId( "mu+" ) ) {
EvtGenReport( EVTGEN_ERROR, fname.c_str() )
<< " Daughter1 is not a mu+, but a "
<< EvtPDL::name( Id_daug1 ) << std::endl;
abort();
}
if ( Id_daug2 != EvtPDL::getId( "mu-" ) ) {
EvtGenReport( EVTGEN_ERROR, fname.c_str() )
<< " Daughter2 is not a mu-, but a "
<< EvtPDL::name( Id_daug2 ) << std::endl;
abort();
}
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Decay mode successfully initialized : J/psi -> mu+ mu-"
<< std::endl;
break;
case VID::RHO:
case VID::OMEGA:
case VID::RHO_OMEGA_MIXING:
if ( Id_daug1 != EvtPDL::getId( "pi+" ) ) {
EvtGenReport( EVTGEN_ERROR, fname.c_str() )
<< " Daughter1 is not a pi+, but a "
<< EvtPDL::name( Id_daug1 ) << std::endl;
abort();
}
if ( Id_daug2 != EvtPDL::getId( "pi-" ) ) {
EvtGenReport( EVTGEN_ERROR, fname.c_str() )
<< " Daughter2 is not a pi-, but a "
<< EvtPDL::name( Id_daug2 ) << std::endl;
abort();
}
if ( Vtype == VID::RHO )
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Decay mode successfully initialized : rho0 -> pi+ pi-"
<< std::endl;
if ( Vtype == VID::OMEGA )
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Decay mode successfully initialized : omega -> pi+ pi-"
<< std::endl;
if ( Vtype == VID::RHO_OMEGA_MIXING )
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Decay mode successfully initialized : rho-omega mixing -> pi+ pi-"
<< std::endl;
break;
default:
EvtGenReport( EVTGEN_ERROR, fname.c_str() )
<< "No decay mode chosen ! " << std::endl;
abort();
break;
}
//fix dynamics parameters
switch ( Vtype ) {
case VID::JPSI:
A = 0.66;
break;
case VID::RHO:
case VID::OMEGA:
case VID::RHO_OMEGA_MIXING:
A = 0.79;
break;
default:
A = 0;
break;
}
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " V decay parameters : " << std::endl;
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " - V density matrix rho00 A = " << A << std::endl;
}
//------------------------------------------------------------------------
// Method 'decay'
//------------------------------------------------------------------------
void EvtV2VpVmForLambdaB2LambdaV::decay( EvtParticle* V )
{
V->makeDaughters( getNDaug(), getDaugs() );
//get Vp and Vm particles
EvtParticle* Vp = V->getDaug( 0 );
EvtParticle* Vm = V->getDaug( 1 );
//get resonance masses
// - V -> mass given by EvtLambdaB2LambdaV class
// - Vp & Vm -> nominal mass
double MASS_V = V->mass();
double MASS_VM = 0;
switch ( Vtype ) {
case VID::JPSI:
MASS_VM = EvtPDL::getMeanMass( EvtPDL::getId( "mu-" ) );
break;
case VID::RHO:
case VID::OMEGA:
case VID::RHO_OMEGA_MIXING:
MASS_VM = EvtPDL::getMeanMass( EvtPDL::getId( "pi-" ) );
break;
default:
MASS_VM = 0;
break;
}
double MASS_VP = MASS_VM;
//generate random angles
double phi = EvtRandom::Flat( 0, 2 * EvtConst::pi );
double theta = acos( EvtRandom::Flat( -1, +1 ) );
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " Angular angles : theta = " << theta << " ; phi = " << phi
<< std::endl;
//computate resonance quadrivectors
double E_Vp = ( MASS_V * MASS_V + MASS_VP * MASS_VP - MASS_VM * MASS_VM ) /
( 2 * MASS_V );
double E_Vm = ( MASS_V * MASS_V + MASS_VM * MASS_VM - MASS_VP * MASS_VP ) /
( 2 * MASS_V );
double P = sqrt( E_Vp * E_Vp - Vp->mass() * Vp->mass() );
EvtVector4R P_V = V->getP4();
EvtParticle* Mother_V = V->getParent();
EvtVector4R lambdab = Mother_V->getP4();
double E_V = ( P_V.get( 0 ) );
double px_M = lambdab.get( 1 );
double py_M = lambdab.get( 2 );
double pz_M = lambdab.get( 3 );
double E_M = lambdab.get( 0 );
EvtVector4R q_lambdab2(
E_M,
( ( 1 / ( sqrt( pow( px_M, 2 ) + pow( py_M, 2 ) ) ) ) *
( ( px_M * ( px_M ) ) + ( py_M * ( py_M ) ) ) ),
( ( 1 / ( sqrt( pow( px_M, 2 ) + pow( py_M, 2 ) ) ) ) *
( -( ( py_M ) * ( px_M ) ) + ( px_M * ( py_M ) ) ) ),
( pz_M ) );
EvtVector4R q_lambdab3( E_M, q_lambdab2.get( 3 ), q_lambdab2.get( 1 ),
q_lambdab2.get( 2 ) );
EvtVector4R q_V1(
E_V,
( ( 1 / ( sqrt( pow( px_M, 2 ) + pow( py_M, 2 ) ) ) ) *
( ( px_M * ( P_V.get( 1 ) ) ) + ( py_M * ( P_V.get( 2 ) ) ) ) ),
( ( 1 / ( sqrt( pow( px_M, 2 ) + pow( py_M, 2 ) ) ) ) *
( -( py_M * ( P_V.get( 1 ) ) ) + ( px_M * ( P_V.get( 2 ) ) ) ) ),
P_V.get( 3 ) );
EvtVector4R q_V2( E_V, q_V1.get( 3 ), q_V1.get( 1 ), q_V1.get( 2 ) );
double px = -( q_V2.get( 1 ) );
double py = -( q_V2.get( 2 ) );
double pz = -( q_V2.get( 3 ) );
EvtVector4R q_V4(
q_V2.get( 0 ),
( ( 1 / ( sqrt( pow( q_V2.get( 1 ), 2 ) + pow( q_V2.get( 2 ), 2 ) +
pow( q_V2.get( 3 ), 2 ) ) ) ) *
( 1 / ( sqrt( pow( q_V2.get( 1 ), 2 ) + pow( q_V2.get( 2 ), 2 ) ) ) ) *
( ( q_V2.get( 1 ) ) * ( q_V2.get( 1 ) ) * ( q_V2.get( 3 ) ) +
( ( q_V2.get( 2 ) ) * ( q_V2.get( 2 ) ) * ( q_V2.get( 3 ) ) ) -
( ( q_V2.get( 3 ) ) *
( pow( q_V2.get( 1 ), 2 ) + pow( q_V2.get( 2 ), 2 ) ) ) ) ),
( ( ( ( q_V2.get( 2 ) ) * ( q_V2.get( 1 ) ) ) -
( ( q_V2.get( 1 ) ) * ( q_V2.get( 2 ) ) ) ) /
( sqrt( pow( q_V2.get( 1 ), 2 ) + pow( q_V2.get( 2 ), 2 ) ) ) ),
( ( ( 1 / sqrt( pow( q_V2.get( 1 ), 2 ) + pow( q_V2.get( 2 ), 2 ) +
pow( q_V2.get( 3 ), 2 ) ) ) *
( ( ( q_V2.get( 1 ) ) * ( q_V2.get( 1 ) ) ) +
( ( q_V2.get( 2 ) ) * ( q_V2.get( 2 ) ) ) +
( ( q_V2.get( 3 ) ) * ( q_V2.get( 3 ) ) ) ) ) ) );
EvtVector4R q_Vp1( E_Vp, P * sin( theta ) * cos( phi ),
P * sin( theta ) * sin( phi ), P * cos( theta ) );
EvtVector4R q_Vm1( E_Vm, -P * sin( theta ) * cos( phi ),
-P * sin( theta ) * sin( phi ), -P * cos( theta ) );
EvtVector4R q_Vp3(
q_Vp1.get( 0 ),
( ( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) *
( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) ) *
( ( q_Vp1.get( 1 ) ) * ( px ) * ( pz ) +
( ( q_Vp1.get( 2 ) ) * ( py ) *
( ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) ) -
( ( ( q_Vp1.get( 3 ) ) ) * ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) *
( px ) ) ) ),
( ( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) *
( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) ) *
( ( ( q_Vp1.get( 1 ) ) ) * ( py ) * ( pz ) -
( ( q_Vp1.get( 2 ) ) * ( px ) *
( ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) ) -
( ( ( q_Vp1.get( 3 ) ) ) * ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) *
( py ) ) ) ),
( ( -( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) ) *
( ( q_Vp1.get( 1 ) ) * ( ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) ) +
( ( q_Vp1.get( 3 ) ) * ( pz ) ) ) ) );
EvtVector4R q_Vm3(
q_Vm1.get( 0 ),
( ( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) *
( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) ) *
( ( q_Vm1.get( 1 ) ) * ( px ) * ( pz ) +
( ( q_Vm1.get( 2 ) ) * ( py ) *
( ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) ) -
( ( ( q_Vm1.get( 3 ) ) ) * ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) *
( px ) ) ) ),
( ( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) *
( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) ) *
( ( ( q_Vm1.get( 1 ) ) ) * ( py ) * ( pz ) -
( ( q_Vm1.get( 2 ) ) * ( px ) *
( ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) ) -
( ( ( q_Vm1.get( 3 ) ) ) * ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) *
( py ) ) ) ),
( ( -( 1 / ( sqrt( pow( px, 2 ) + pow( py, 2 ) + pow( pz, 2 ) ) ) ) ) *
( ( q_Vm1.get( 1 ) ) * ( ( sqrt( pow( px, 2 ) + pow( py, 2 ) ) ) ) +
( ( q_Vm1.get( 3 ) ) * ( pz ) ) ) ) );
EvtVector4R q_Vp5( q_Vp3.get( 0 ), ( q_Vp3.get( 2 ) ), ( q_Vp3.get( 3 ) ),
( q_Vp3.get( 1 ) ) );
EvtVector4R q_Vm5( q_Vm3.get( 0 ), ( q_Vm3.get( 2 ) ), ( q_Vm3.get( 3 ) ),
( q_Vm3.get( 1 ) ) );
EvtVector4R q_Vp(
q_Vp5.get( 0 ),
( ( 1 / ( sqrt( pow( px_M, 2 ) + pow( py_M, 2 ) ) ) ) *
( ( px_M * ( q_Vp5.get( 1 ) ) ) - ( py_M * ( q_Vp5.get( 2 ) ) ) ) ),
( ( 1 / ( sqrt( pow( px_M, 2 ) + pow( py_M, 2 ) ) ) ) *
( ( py_M * ( q_Vp5.get( 1 ) ) ) + ( px_M * ( q_Vp5.get( 2 ) ) ) ) ),
( q_Vp5.get( 3 ) ) );
EvtVector4R q_Vm(
q_Vm5.get( 0 ),
( ( 1 / ( sqrt( pow( px_M, 2 ) + pow( py_M, 2 ) ) ) ) *
( ( px_M * ( q_Vm5.get( 1 ) ) ) - ( py_M * ( q_Vm5.get( 2 ) ) ) ) ),
( ( 1 / ( sqrt( pow( px_M, 2 ) + pow( py_M, 2 ) ) ) ) *
( ( py_M * ( q_Vm5.get( 1 ) ) ) + ( px_M * ( q_Vm5.get( 2 ) ) ) ) ),
( q_Vm5.get( 3 ) ) );
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab px: " << px_M << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab py: " << py_M << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab pz: " << pz_M << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab E: " << E_M << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab2 px: " << q_lambdab2.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab2 py: " << q_lambdab2.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab2 pz: " << q_lambdab2.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab2 E: " << q_lambdab2.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab3 px: " << q_lambdab3.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab3 py: " << q_lambdab3.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab3 pz: " << q_lambdab3.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Lambdab3 E: " << q_lambdab3.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 0 px: " << P_V.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 0 py: " << P_V.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 0 pz: " << P_V.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 0 E: " << P_V.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 1 px: " << q_V1.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 1 py: " << q_V1.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 1 pz: " << q_V1.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 1 E: " << q_V1.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 2 px: " << q_V2.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 2 py: " << q_V2.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 2 pz: " << q_V2.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " V 2 E: " << q_V2.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() ) << " V px: " << px << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() ) << " V py: " << py << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() ) << " V pz: " << pz << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vm 1 px: " << q_Vm1.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vm 1 py: " << q_Vm1.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vm 1 pz: " << q_Vm1.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vm 1 E: " << q_Vm1.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vm 3 px: " << q_Vm3.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vm 3 px: " << q_Vm3.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vm 3 py: " << q_Vm3.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vm 3 pz: " << q_Vm3.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vm 3 E: " << q_Vm3.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vm 5 px: " << q_Vm5.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vm 5 py: " << q_Vm5.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vm 5 pz: " << q_Vm5.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vm 5 E: " << q_Vm5.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vp 1 px: " << q_Vp1.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vp 1 py: " << q_Vp1.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vp 1 pz: " << q_Vp1.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vp 1 E: " << q_Vp1.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vp 3 px: " << q_Vp3.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vp 3 py: " << q_Vp3.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vp 3 pz: " << q_Vp3.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vp 3 E: " << q_Vp3.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vp 5 px: " << q_Vp5.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vp 5 py: " << q_Vp5.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vp 5 pz: " << q_Vp5.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vp 5 E: " << q_Vp5.get( 0 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vp px: " << q_Vp.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vp py: " << q_Vp.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< "Vp pz: " << q_Vp.get( 3 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vm px: " << q_Vm.get( 1 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vm py: " << q_Vm.get( 2 ) << std::endl;
EvtGenReport( EVTGEN_INFO, fname.c_str() )
<< " Vm pz: " << q_Vm.get( 3 ) << std::endl;
//set quadrivectors to particles
Vp->init( getDaugs()[0], q_Vp );
Vm->init( getDaugs()[1], q_Vm );
//computate pdf
double pdf = 0;
if ( Vtype == VID::JPSI ) {
//leptonic case
pdf = ( 1 - 3 * A ) * cos( theta ) * cos( theta ) + ( 1 + A );
} else {
//hadronic case
pdf = ( 3 * A - 1 ) * cos( theta ) * cos( theta ) + ( 1 - A );
}
EvtGenReport( EVTGEN_DEBUG, fname.c_str() )
<< " V decay pdf value : " << pdf << std::endl;
//set probability
setProb( pdf );
return;
}

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