LauNRAmplitude.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

#include <iostream>

#include "LauKinematics.hh"
#include "LauNRAmplitude.hh"
#include "LauResonanceInfo.hh"

ClassImp(LauNRAmplitude)

LauNRAmplitude::LauNRAmplitude(LauResonanceInfo* resInfo, const Int_t resPairAmpInt, const LauDaughters* daughters) :
        LauAbsResonance(resInfo, resPairAmpInt, daughters),
        d_(0),
        c1_(0),
        c2_(0),
        p1_(0),
        p2_(0)
{
        // Default values for parameters, taken from arXiv:0709.0075v1 [hep-ph]
        const Double_t dVal(1.3232e-3);
        const Double_t c1Val(0.65);
        const Double_t c2Val(0.55);
        const Double_t p1Val(18.0);
        const Double_t p2Val(15.0);

        const TString& parNameBase = this->getSanitisedName();

        TString dName(parNameBase);
        dName += "_d";
        d_ = resInfo->getExtraParameter( dName );
        if ( d_ == 0 ) {
                d_ = new LauParameter( dName, dVal, 0.0, 1.0, kTRUE );
                d_->secondStage(kTRUE);
                resInfo->addExtraParameter( d_ );
        }

        TString c1Name(parNameBase);
        c1Name += "_c1";
        c1_ = resInfo->getExtraParameter( c1Name );
        if ( c1_ == 0 ) {
                c1_ = new LauParameter( c1Name, c1Val, 0.0, 2.0, kTRUE );
                c1_->secondStage(kTRUE);
                resInfo->addExtraParameter( c1_ );
        }

        TString c2Name(parNameBase);
        c2Name += "_c2";
        c2_ = resInfo->getExtraParameter( c2Name );
        if ( c2_ == 0 ) {
                c2_ = new LauParameter( c2Name, c2Val, 0.0, 2.0, kTRUE );
                c2_->secondStage(kTRUE);
                resInfo->addExtraParameter( c2_ );
        }

        TString p1Name(parNameBase);
        p1Name += "_p1";
        p1_ = resInfo->getExtraParameter( p1Name );
        if ( p1_ == 0 ) {
                p1_ = new LauParameter( p1Name, p1Val, 0.0, 50.0, kTRUE );
                p1_->secondStage(kTRUE);
                resInfo->addExtraParameter( p1_ );
        }

        TString p2Name(parNameBase);
        p2Name += "_p2";
        p2_ = resInfo->getExtraParameter( p2Name );
        if ( p2_ == 0 ) {
                p2_ = new LauParameter( p2Name, p2Val, 0.0, 50.0, kTRUE );
                p2_->secondStage(kTRUE);
                resInfo->addExtraParameter( p2_ );
        }
}

LauNRAmplitude::~LauNRAmplitude()
{
}

void LauNRAmplitude::initialise()
{
}

LauComplex LauNRAmplitude::amplitude(const LauKinematics* kinematics)
{
        // Get the information from the kinematics object
        const Double_t m13Sq = kinematics->getm13Sq();
        const Double_t m23Sq = kinematics->getm23Sq();
        const Double_t m13 = kinematics->getm13();
        const Double_t m23 = kinematics->getm23();

        // Calculate the magnitude
        Double_t magnitude = TMath::Sqrt( m13 * m23 *
                                          this->f(m23Sq, c1_->unblindValue(), p1_->unblindValue()) * 
                                          this->f(m13Sq, c2_->unblindValue(), p2_->unblindValue()) * 
                                          TMath::Exp( -1.0 * d_->unblindValue() * m13Sq*m13Sq * m23Sq*m23Sq )
                                        );

        // return the amplitude
        LauComplex resAmplitude(magnitude, 0.0);
        return resAmplitude;
}

LauComplex LauNRAmplitude::resAmp(Double_t mass, Double_t spinTerm)
{
        std::cerr << "ERROR in LauNRAmplitude::resAmp : This method shouldn't get called." << std::endl;
        std::cerr << "                                  Returning zero amplitude for mass = " << mass << " and spinTerm = " << spinTerm << "." << std::endl;
        return LauComplex(0.0, 0.0);
}

Double_t LauNRAmplitude::f(const Double_t s, const Double_t c, const Double_t p) const
{
        return 1.0 / (1.0 + TMath::Exp( c * (s-p) ));
}

const std::vector<LauParameter*>& LauNRAmplitude::getFloatingParameters()
{
        this->clearFloatingParameters();

        if ( ! this->fixdParameter() ) {
                this->addFloatingParameter( d_ );
        }

        if ( ! this->fixc1Parameter() ) {
                this->addFloatingParameter( c1_ );
        }

        if ( ! this->fixc2Parameter() ) {
                this->addFloatingParameter( c2_ );
        }

        if ( ! this->fixp1Parameter() ) {
                this->addFloatingParameter( p1_ );
        }

        if ( ! this->fixp2Parameter() ) {
                this->addFloatingParameter( p2_ );
        }

        return this->getParameters();
}

void LauNRAmplitude::setResonanceParameter(const TString& name, const Double_t value)
{
        // Set various parameters for the NRAmplitude lineshape dynamics
        if (name == "d") {
                this->setdParameter(value);
                std::cout << "INFO in LauNRAmplitude::setResonanceParameter : Setting NRAmplitude d = " << this->getdParameter() << std::endl;
        } else if (name == "c1") {
                this->setc1Parameter(value);
                std::cout << "INFO in LauNRAmplitude::setResonanceParameter : Setting NRAmplitude c1 = " << this->getc1Parameter() << std::endl;
        } else if (name == "c2") {
                this->setc2Parameter(value);
                std::cout << "INFO in LauNRAmplitude::setResonanceParameter : Setting NRAmplitude c2 = " << this->getc2Parameter() << std::endl;
        } else if (name == "p1") {
                this->setp1Parameter(value);
                std::cout << "INFO in LauNRAmplitude::setResonanceParameter : Setting NRAmplitude p1 = " << this->getp1Parameter() << std::endl;
        } else if (name == "p2") {
                this->setp2Parameter(value);
                std::cout << "INFO in LauNRAmplitude::setResonanceParameter : Setting NRAmplitude p2 = " << this->getp2Parameter() << std::endl;
        } else {
                std::cerr << "WARNING in LauNRAmplitude::setResonanceParameter: Parameter name not reconised.  No parameter changes made." << std::endl;
        }
}

void LauNRAmplitude::floatResonanceParameter(const TString& name)
{
        if (name == "d") {
                if ( d_->fixed() ) {
                        d_->fixed( kFALSE );
                        this->addFloatingParameter( d_ );
                } else {
                        std::cerr << "WARNING in LauNRAmplitude::floatResonanceParameter: Parameter already floating.  No parameter changes made." << std::endl;
                }
        } else if (name == "c1") {
                if ( c1_->fixed() ) {
                        c1_->fixed( kFALSE );
                        this->addFloatingParameter( c1_ );
                } else {
                        std::cerr << "WARNING in LauNRAmplitude::floatResonanceParameter: Parameter already floating.  No parameter changes made." << std::endl;
                }
        } else if (name == "c2") {
                if ( c2_->fixed() ) {
                        c2_->fixed( kFALSE );
                        this->addFloatingParameter( c2_ );
                } else {
                        std::cerr << "WARNING in LauNRAmplitude::floatResonanceParameter: Parameter already floating.  No parameter changes made." << std::endl;
                }
        } else if (name == "p1") {
                if ( p1_->fixed() ) {
                        p1_->fixed( kFALSE );
                        this->addFloatingParameter( p1_ );
                } else {
                        std::cerr << "WARNING in LauNRAmplitude::floatResonanceParameter: Parameter already floating.  No parameter changes made." << std::endl;
                }
        } else if (name == "p2") {
                if ( p2_->fixed() ) {
                        p2_->fixed( kFALSE );
                        this->addFloatingParameter( p2_ );
                } else {
                        std::cerr << "WARNING in LauNRAmplitude::floatResonanceParameter: Parameter already floating.  No parameter changes made." << std::endl;
                }
        } else {
                std::cerr << "WARNING in LauNRAmplitude::fixResonanceParameter: Parameter name not reconised.  No parameter changes made." << std::endl;
        }
}

LauParameter* LauNRAmplitude::getResonanceParameter(const TString& name)
{
        if (name == "d") {
                return d_;
        } else if (name == "c1") {
                return c1_;
        } else if (name == "c2") {
                return c2_;
        } else if (name == "p1") {
                return p1_;
        } else if (name == "p2") {
                return p2_;
        } else {
                std::cerr << "WARNING in LauNRAmplitude::getResonanceParameter: Parameter name not reconised." << std::endl;
                return 0;
        }
}

void LauNRAmplitude::setdParameter(const Double_t d)
{
        d_->value( d );
        d_->genValue( d );
        d_->initValue( d );
}

void LauNRAmplitude::setc1Parameter(const Double_t c1)
{
        c1_->value( c1 );
        c1_->genValue( c1 );
        c1_->initValue( c1 );
}

void LauNRAmplitude::setc2Parameter(const Double_t c2)
{
        c2_->value( c2 );
        c2_->genValue( c2 );
        c2_->initValue( c2 );
}

void LauNRAmplitude::setp1Parameter(const Double_t p1)
{
        p1_->value( p1 );
        p1_->genValue( p1 );
        p1_->initValue( p1 );
}

void LauNRAmplitude::setp2Parameter(const Double_t p2)
{
        p2_->value( p2 );
        p2_->genValue( p2 );
        p2_->initValue( p2 );
}