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LauAbsResonance.cc
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// Copyright University of Warwick 2004 - 2014.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// Authors:
// Thomas Latham
// John Back
// Paul Harrison
/*! \file LauAbsResonance.cc
\brief File containing implementation of LauAbsResonance class.
*/
#include <iostream>
#include "TSystem.h"
#include "LauAbsResonance.hh"
#include "LauConstants.hh"
#include "LauDaughters.hh"
#include "LauKinematics.hh"
#include "LauParameter.hh"
#include "LauResonanceInfo.hh"
ClassImp(LauAbsResonance)
// Constructor
LauAbsResonance::LauAbsResonance(LauResonanceInfo* resInfo, const Int_t resPairAmpInt, const LauDaughters* daughters) :
resInfo_(resInfo),
daughters_(daughters),
nameParent_(""), nameDaug1_(""), nameDaug2_(""), nameBachelor_(""),
chargeParent_(0), chargeDaug1_(0), chargeDaug2_(0), chargeBachelor_(0),
massParent_(0.0), massDaug1_(0.0), massDaug2_(0.0), massBachelor_(0.0),
resName_( (resInfo!=0) ? resInfo->getName() : "" ),
sanitisedName_( (resInfo!=0) ? resInfo->getSanitisedName() : "" ),
resMass_( (resInfo!=0) ? resInfo->getMass() : 0 ),
resWidth_( (resInfo!=0) ? resInfo->getWidth() : 0 ),
resSpin_( (resInfo!=0) ? resInfo->getSpin() : 0 ),
resCharge_( (resInfo!=0) ? resInfo->getCharge() : 0 ),
resPairAmpInt_(resPairAmpInt),
parBWFactor_(0),
resBWFactor_(0),
flipHelicity_(kFALSE),
ignoreMomenta_(kFALSE),
q_(0.0),
p_(0.0),
pstar_(0.0)
{
if ( resInfo == 0 ) {
std::cerr << "ERROR in LauAbsResonance constructor : null LauResonanceInfo object provided" << std::endl;
gSystem->Exit(EXIT_FAILURE);
}
if ( daughters_ == 0 ) {
std::cerr << "ERROR in LauAbsResonance constructor : null LauDaughters object provided" << std::endl;
gSystem->Exit(EXIT_FAILURE);
}
nameParent_ = this->getNameParent();
nameDaug1_ = this->getNameDaug1();
nameDaug2_ = this->getNameDaug2();
nameBachelor_ = this->getNameBachelor();
massParent_ = this->getMassParent();
massDaug1_ = this->getMassDaug1();
massDaug2_ = this->getMassDaug2();
massBachelor_ = this->getMassBachelor();
chargeParent_ = this->getChargeParent();
chargeDaug1_ = this->getChargeDaug1();
chargeDaug2_ = this->getChargeDaug2();
chargeBachelor_ = this->getChargeBachelor();
// check that the total charge adds up to that of the resonance
Int_t totalCharge = chargeDaug1_ + chargeDaug2_;
if ( (totalCharge != resCharge_) && (resPairAmpInt_ != 0) ) {
std::cerr << "ERROR in LauAbsResonance : Total charge of daughters = " << totalCharge << ". Resonance charge = " << resCharge_ << "." << std::endl;
gSystem->Exit(EXIT_FAILURE);
}
}
// Constructor
LauAbsResonance::LauAbsResonance(const TString& resName, const Int_t resPairAmpInt, const LauDaughters* daughters) :
resInfo_(0),
daughters_(daughters),
nameParent_(""), nameDaug1_(""), nameDaug2_(""), nameBachelor_(""),
chargeParent_(0), chargeDaug1_(0), chargeDaug2_(0), chargeBachelor_(0),
massParent_(0.0), massDaug1_(0.0), massDaug2_(0.0), massBachelor_(0.0),
resName_(resName),
sanitisedName_(resName),
resMass_(0),
resWidth_(0),
resSpin_(0),
resCharge_(0),
resPairAmpInt_(resPairAmpInt),
parBWFactor_(0),
resBWFactor_(0),
flipHelicity_(kFALSE),
ignoreMomenta_(kFALSE),
q_(0.0),
p_(0.0),
pstar_(0.0)
{
if ( daughters_ == 0 ) {
std::cerr << "ERROR in LauAbsResonance constructor : null LauDaughters object provided" << std::endl;
gSystem->Exit(EXIT_FAILURE);
}
nameParent_ = this->getNameParent();
nameDaug1_ = this->getNameDaug1();
nameDaug2_ = this->getNameDaug2();
nameBachelor_ = this->getNameBachelor();
massParent_ = this->getMassParent();
massDaug1_ = this->getMassDaug1();
massDaug2_ = this->getMassDaug2();
massBachelor_ = this->getMassBachelor();
chargeParent_ = this->getChargeParent();
chargeDaug1_ = this->getChargeDaug1();
chargeDaug2_ = this->getChargeDaug2();
chargeBachelor_ = this->getChargeBachelor();
// check that the total charge adds up to that of the resonance
Int_t totalCharge = chargeDaug1_ + chargeDaug2_;
if ( (totalCharge != resCharge_) && (resPairAmpInt_ != 0) ) {
std::cerr << "ERROR in LauAbsResonance : Total charge of daughters = " << totalCharge << ". Resonance charge = " << resCharge_ << "." << std::endl;
gSystem->Exit(EXIT_FAILURE);
}
}
// Destructor
LauAbsResonance::~LauAbsResonance()
{
}
LauComplex LauAbsResonance::amplitude(const LauKinematics* kinematics)
{
// Use LauKinematics interface for amplitude
Double_t mass(0.0), cosHel(0.0);
// For resonance made from tracks i, j, we need the momenta
// of tracks i and k in the i-j rest frame for spin helicity calculations
// in the Zemach tensor formalism.
// Also need the momentum of track k in the parent rest-frame for
// calculation of the Blatt-Weisskopf factors.
q_ = 0.0; p_ = 0.0; pstar_ = 0.0;
if (resPairAmpInt_ == 1) {
mass = kinematics->getm23();
cosHel = kinematics->getc23();
q_ = kinematics->getp2_23();
p_ = kinematics->getp1_23();
pstar_ = kinematics->getp1_Parent();
} else if (resPairAmpInt_ == 2) {
mass = kinematics->getm13();
cosHel = kinematics->getc13();
q_ = kinematics->getp1_13();
p_ = kinematics->getp2_13();
pstar_ = kinematics->getp2_Parent();
} else if (resPairAmpInt_ == 3) {
mass = kinematics->getm12();
cosHel = kinematics->getc12();
q_ = kinematics->getp1_12();
p_ = kinematics->getp3_12();
pstar_ = kinematics->getp3_Parent();
} else {
std::cerr << "ERROR in LauAbsResonance::amplitude : Nonsense setup of resPairAmp array." << std::endl;
gSystem->Exit(EXIT_FAILURE);
}
if (this->flipHelicity()) {
cosHel *= -1.0;
}
if (this->ignoreMomenta()) {
q_ = 1.0;
p_ = 1.0;
}
// Calculate the spin factors
//
// These are calculated as follows
//
// -2^j * (q*p)^j * cj * Pj(cosHel)
//
// where Pj(coshHel) is the jth order Legendre polynomial and
//
// cj = j! / (2j-1)!!
Double_t spinTerm(1.0);
if (resSpin_ == 1) {
// Calculate vector resonance Zemach helicity factor
spinTerm = -2.0*q_*p_*cosHel;
} else if (resSpin_ == 2) {
// Calculate tensor resonance Zemach helicity factor
Double_t pProd = q_*p_;
spinTerm = 4.0*(pProd*pProd)*(3.0*cosHel*cosHel - 1.0)/3.0;
} else if (resSpin_ == 3) {
// Calculate spin 3 resonance Zemach helicity factor
Double_t pProd = q_*p_;
spinTerm = -8.0*(pProd*pProd*pProd)*(5.0*cosHel*cosHel*cosHel - 3.0*cosHel)/5.0;
} else if (resSpin_ == 4) {
// Calculate spin 4 resonance Zemach helicity factor
Double_t pProd = q_*p_;
spinTerm = 16.0*(pProd*pProd*pProd*pProd)*(35.0*cosHel*cosHel*cosHel*cosHel - 30.0*cosHel*cosHel + 3.0)/35.0;
} else if (resSpin_ == 5) {
// Calculate spin 5 resonance Zemach helicity factor
Double_t pProd = q_*p_;
spinTerm = -32.0*(pProd*pProd*pProd*pProd*pProd)*(63.0*cosHel*cosHel*cosHel*cosHel*cosHel - 70.0*cosHel*cosHel*cosHel + 15.0*cosHel)/63.0;
}
LauComplex resAmplitude = this->resAmp(mass, spinTerm);
return resAmplitude;
}
void LauAbsResonance::changeResonance(const Double_t newMass, const Double_t newWidth, const Int_t newSpin)
{
if (newMass > 0.0) {
resMass_->valueAndRange(newMass,0.0,3.0*newMass);
resMass_->initValue(newMass);
resMass_->genValue(newMass);
std::cout << "INFO in LauAbsResonance::changeResonance : Setting mass to " << resMass_->value() << std::endl;
}
if (newWidth > 0.0) {
resWidth_->valueAndRange(newWidth,0.0,3.0*newWidth);
resWidth_->initValue(newWidth);
resWidth_->genValue(newWidth);
std::cout << "INFO in LauAbsResonance::changeResonance : Setting width to " << resWidth_->value() << std::endl;
}
if (newSpin > -1) {
resSpin_ = newSpin;
std::cout << "INFO in LauAbsResonance::changeResonance : Setting spin to " << resSpin_ << std::endl;
}
}
void LauAbsResonance::changeBWBarrierRadii(const Double_t resRadius, const Double_t parRadius)
{
if ( resRadius >= 0.0 && resBWFactor_ != 0 ) {
LauParameter* resBWRadius = resBWFactor_->getRadiusParameter();
resBWRadius->value(resRadius);
resBWRadius->initValue(resRadius);
resBWRadius->genValue(resRadius);
std::cout << "INFO in LauAbsResonance::changeBWBarrierRadii : Setting resonance factor radius to " << resBWRadius->value() << std::endl;
}
if ( parRadius >= 0.0 && parBWFactor_ != 0 ) {
LauParameter* parBWRadius = parBWFactor_->getRadiusParameter();
parBWRadius->value(parRadius);
parBWRadius->initValue(parRadius);
parBWRadius->genValue(parRadius);
std::cout << "INFO in LauAbsResonance::changeBWBarrierRadii : Setting parent factor radius to " << parBWRadius->value() << std::endl;
}
}
void LauAbsResonance::setResonanceParameter(const TString& name, const Double_t value)
{
//This function should always be overwritten if needed in classes inheriting from LauAbsResonance.
std::cerr << "WARNING in LauAbsResonance::setResonanceParameter : Unable to set parameter \"" << name << "\" to value: " << value << "." << std::endl;
}
void LauAbsResonance::floatResonanceParameter(const TString& name)
{
//This function should always be overwritten if needed in classes inheriting from LauAbsResonance.
std::cerr << "WARNING in LauAbsResonance::floatResonanceParameter : Unable to release parameter \"" << name << "\"." << std::endl;
}
LauParameter* LauAbsResonance::getResonanceParameter(const TString& name)
{
//This function should always be overwritten if needed in classes inheriting from LauAbsResonance.
std::cerr << "WARNING in LauAbsResonance::getResonanceParameter : Unable to get parameter \"" << name << "\"." << std::endl;
return 0;
}
void LauAbsResonance::addFloatingParameter( LauParameter* param )
{
if ( param == 0 ) {
return;
}
if ( param->clone() ) {
resParameters_.push_back( param->parent() );
} else {
resParameters_.push_back( param );
}
}
void LauAbsResonance::fixBarrierRadii(const Bool_t fixResRad, const Bool_t fixParRad)
{
if ( resBWFactor_ == 0 ) {
std::cerr << "WARNING in LauAbsResonance::fixBarrierRadii : resonance barrier factor not present, cannot fix/float it" << std::endl;
return;
}
if ( parBWFactor_ == 0 ) {
std::cerr << "WARNING in LauAbsResonance::fixBarrierRadii : parent barrier factor not present, cannot fix/float it" << std::endl;
return;
}
LauParameter* resBWRadius = resBWFactor_->getRadiusParameter();
resBWRadius->fixed(fixResRad);
LauParameter* parBWRadius = parBWFactor_->getRadiusParameter();
parBWRadius->fixed(fixParRad);
}
Bool_t LauAbsResonance::fixResRadius() const
{
if ( resBWFactor_ == 0 ) {
std::cerr << "WARNING in LauAbsResonance::fixResRadius : resonance barrier factor not present" << std::endl;
return kTRUE;
}
LauParameter* bwRadius = resBWFactor_->getRadiusParameter();
return bwRadius->fixed();
}
Bool_t LauAbsResonance::fixParRadius() const
{
if ( parBWFactor_ == 0 ) {
std::cerr << "WARNING in LauAbsResonance::fixParRadius : parent barrier factor not present" << std::endl;
return kTRUE;
}
LauParameter* bwRadius = parBWFactor_->getRadiusParameter();
return bwRadius->fixed();
}
Double_t LauAbsResonance::getResRadius() const
{
if ( resBWFactor_ == 0 ) {
std::cerr << "WARNING in LauAbsResonance::getResRadius : resonance barrier factor not present" << std::endl;
return -1.0;
}
LauParameter* bwRadius = resBWFactor_->getRadiusParameter();
return bwRadius->value();
}
Double_t LauAbsResonance::getParRadius() const
{
if ( parBWFactor_ == 0 ) {
std::cerr << "WARNING in LauAbsResonance::getParRadius : parent barrier factor not present" << std::endl;
return -1.0;
}
LauParameter* bwRadius = parBWFactor_->getRadiusParameter();
return bwRadius->value();
}
Double_t LauAbsResonance::getMassParent() const
{
// Get the parent mass
Double_t mass(LauConstants::mB);
if (daughters_) {
mass = daughters_->getMassParent();
}
return mass;
}
Double_t LauAbsResonance::getMassDaug1() const
{
// Get the daughter mass
Double_t mass(LauConstants::mPi);
if (daughters_) {
if (resPairAmpInt_ == 1) {
mass = daughters_->getMassDaug2();
} else if (resPairAmpInt_ == 2) {
mass = daughters_->getMassDaug1();
} else if (resPairAmpInt_ == 3) {
mass = daughters_->getMassDaug1();
}
}
return mass;
}
Double_t LauAbsResonance::getMassDaug2() const
{
// Get the daughter mass
Double_t mass(LauConstants::mPi);
if (daughters_) {
if (resPairAmpInt_ == 1) {
mass = daughters_->getMassDaug3();
} else if (resPairAmpInt_ == 2) {
mass = daughters_->getMassDaug3();
} else if (resPairAmpInt_ == 3) {
mass = daughters_->getMassDaug2();
}
}
return mass;
}
Double_t LauAbsResonance::getMassBachelor() const
{
// Get the bachelor mass
Double_t mass(LauConstants::mPi);
if (daughters_) {
if (resPairAmpInt_ == 1) {
mass = daughters_->getMassDaug1();
} else if (resPairAmpInt_ == 2) {
mass = daughters_->getMassDaug2();
} else if (resPairAmpInt_ == 3) {
mass = daughters_->getMassDaug3();
}
}
return mass;
}
Int_t LauAbsResonance::getChargeParent() const
{
// Get the parent charge
Int_t charge(0);
if (daughters_) {
charge = daughters_->getChargeParent();
}
return charge;
}
Int_t LauAbsResonance::getChargeDaug1() const
{
// Get the daughter charge
Int_t charge(0);
if (daughters_) {
if (resPairAmpInt_ == 1) {
charge = daughters_->getChargeDaug2();
} else if (resPairAmpInt_ == 2) {
charge = daughters_->getChargeDaug1();
} else if (resPairAmpInt_ == 3) {
charge = daughters_->getChargeDaug1();
}
}
return charge;
}
Int_t LauAbsResonance::getChargeDaug2() const
{
// Get the daughter charge
Int_t charge(0);
if (daughters_) {
if (resPairAmpInt_ == 1) {
charge = daughters_->getChargeDaug3();
} else if (resPairAmpInt_ == 2) {
charge = daughters_->getChargeDaug3();
} else if (resPairAmpInt_ == 3) {
charge = daughters_->getChargeDaug2();
}
}
return charge;
}
Int_t LauAbsResonance::getChargeBachelor() const
{
// Get the bachelor charge
Int_t charge(0);
if (daughters_) {
if (resPairAmpInt_ == 1) {
charge = daughters_->getChargeDaug1();
} else if (resPairAmpInt_ == 2) {
charge = daughters_->getChargeDaug2();
} else if (resPairAmpInt_ == 3) {
charge = daughters_->getChargeDaug3();
}
}
return charge;
}
TString LauAbsResonance::getNameParent() const
{
// Get the parent name
TString name("");
if (daughters_) {
name = daughters_->getNameParent();
}
return name;
}
TString LauAbsResonance::getNameDaug1() const
{
// Get the daughter name
TString name("");
if (daughters_) {
if (resPairAmpInt_ == 1) {
name = daughters_->getNameDaug2();
} else if (resPairAmpInt_ == 2) {
name = daughters_->getNameDaug1();
} else if (resPairAmpInt_ == 3) {
name = daughters_->getNameDaug1();
}
}
return name;
}
TString LauAbsResonance::getNameDaug2() const
{
// Get the daughter name
TString name("");
if (daughters_) {
if (resPairAmpInt_ == 1) {
name = daughters_->getNameDaug3();
} else if (resPairAmpInt_ == 2) {
name = daughters_->getNameDaug3();
} else if (resPairAmpInt_ == 3) {
name = daughters_->getNameDaug2();
}
}
return name;
}
TString LauAbsResonance::getNameBachelor() const
{
// Get the bachelor name
TString name("");
if (daughters_) {
if (resPairAmpInt_ == 1) {
name = daughters_->getNameDaug1();
} else if (resPairAmpInt_ == 2) {
name = daughters_->getNameDaug2();
} else if (resPairAmpInt_ == 3) {
name = daughters_->getNameDaug3();
}
}
return name;
}

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