G4SampleResonance Class Reference

#include <G4SampleResonance.hh>

Public Types
typedef std::map< const G4ParticleDefinition *, G4double, std::less< const G4ParticleDefinition * > >::const_iterator	minMassMapIterator
typedef std::map< const G4ParticleDefinition *, G4double, std::less< const G4ParticleDefinition * > >	minMassMapType

Public Member Functions
G4double	GetMinimumMass (const G4ParticleDefinition *p) const
G4double	SampleMass (const G4double poleMass, const G4double gamma, const G4double minMass, const G4double maxMass) const
G4double	SampleMass (const G4ParticleDefinition *p, const G4double maxMass) const

Detailed Description

Definition at line 45 of file G4SampleResonance.hh.

Member Typedef Documentation

typedef std::map<const G4ParticleDefinition*, G4double, std::less<const G4ParticleDefinition*> >::const_iterator G4SampleResonance::minMassMapIterator

Definition at line 69 of file G4SampleResonance.hh.

typedef std::map<const G4ParticleDefinition*, G4double, std::less<const G4ParticleDefinition*> > G4SampleResonance::minMassMapType

Definition at line 70 of file G4SampleResonance.hh.

Member Function Documentation

G4double G4SampleResonance::GetMinimumMass

(

const G4ParticleDefinition *

p

)

const

Definition at line 46 of file G4SampleResonance.cc.

References DBL_MAX, G4DecayTable::entries(), G4DecayTable::GetDecayChannel(), G4VDecayChannel::GetNumberOfDaughters(), G4ParticleDefinition::GetPDGMass(), and G4ParticleDefinition::IsShortLived().

Referenced by G4KineticTrack::Decay(), G4KineticTrack::G4KineticTrack(), and SampleMass().

{  ;;;   if (!minMassCache_G4MT_TLS_) minMassCache_G4MT_TLS_ = new G4SampleResonance::minMassMapType  ; G4SampleResonance::minMassMapType &minMassCache = *minMassCache_G4MT_TLS_;  ;;;  

    G4double minResonanceMass = DBL_MAX;

    if ( p->IsShortLived() )
    {
        minMassMapIterator iter = minMassCache.find(p);
        if ( iter!=minMassCache.end() )
        {
            minResonanceMass = (*iter).second;
        }
        else
        {
            // G4cout << "--> request for " << p->GetParticleName() << G4endl;

            const G4DecayTable* theDecays = const_cast<G4ParticleDefinition*>(p)->GetDecayTable();
            const G4int nDecays = theDecays->entries();

            for (G4int i=0; i<nDecays; i++)
            {
                const G4VDecayChannel* aDecay = theDecays->GetDecayChannel(i);
                const G4int nDaughters = aDecay->GetNumberOfDaughters();

                G4double minChannelMass = 0;

                for (G4int j=0; j<nDaughters; j++)
                {
                    const G4ParticleDefinition* aDaughter = const_cast<G4VDecayChannel*>(aDecay)->GetDaughter(j);
                    G4double minMass = GetMinimumMass(aDaughter);
                    if (!minMass) minMass = DBL_MAX; // exclude gamma channel;
                    minChannelMass+=minMass;
                }
                // G4cout << "channel mass for the above is " << minChannelMass/MeV << G4endl;
                if (minChannelMass < minResonanceMass) minResonanceMass = minChannelMass;

            }
            // replace this as soon as the compiler supports mutable!!
            G4SampleResonance* self = const_cast<G4SampleResonance*>(this);
            //Andrea Dotti (13Jan2013): Change needed for G4MT
            //(self->minMassCache)[p] = minResonanceMass;
            self->minMassCache_G4MT_TLS_->operator[](p) = minResonanceMass;

        }
    } 
    else
    {

        minResonanceMass = p->GetPDGMass();

    }
    // G4cout << "minimal mass for " << p->GetParticleName() << " is " << minResonanceMass/MeV << G4endl;

    return minResonanceMass;
} 

G4double G4SampleResonance::SampleMass	(	const G4double	poleMass,
		const G4double	gamma,
		const G4double	minMass,
		const G4double	maxMass
	)		const

Definition at line 110 of file G4SampleResonance.cc.

References DBL_EPSILON, G4UniformRand, G4INCL::Math::max(), and G4INCL::Math::min().

Referenced by G4KineticTrack::Decay(), and SampleMass().

{ if (!minMassCache_G4MT_TLS_) minMassCache_G4MT_TLS_ = new G4SampleResonance::minMassMapType  ;
    // Chooses a mass randomly between minMass and maxMass
    //     according to a Breit-Wigner function with constant
    //     width gamma and pole poleMass

    if ( minMass > maxMass )
    {
        throw G4HadronicException(__FILE__, __LINE__,
                "SampleResonanceMass: mass range negative (minMass>maxMass)");
    }

    G4double returnMass;

    if ( gamma < DBL_EPSILON )
    {
        returnMass = std::max(minMass, std::min(maxMass, poleMass));
    }
    else
    {
        double fmin = BrWigInt0(minMass, gamma, poleMass);
        double fmax = BrWigInt0(maxMass, gamma, poleMass);
        double f = fmin + (fmax-fmin)*G4UniformRand();
        returnMass = BrWigInv(f, gamma, poleMass);
    }

    return returnMass;
}

G4double G4SampleResonance::SampleMass	(	const G4ParticleDefinition *	p,
		const G4double	maxMass
	)		const

Definition at line 104 of file G4SampleResonance.cc.

References GetMinimumMass(), G4ParticleDefinition::GetPDGMass(), G4ParticleDefinition::GetPDGWidth(), and SampleMass().

{ if (!minMassCache_G4MT_TLS_) minMassCache_G4MT_TLS_ = new G4SampleResonance::minMassMapType  ;
    return SampleMass(p->GetPDGMass(), p->GetPDGWidth(), GetMinimumMass(p), maxMass);
}

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The documentation for this class was generated from the following files:

• G4SampleResonance.hh
• G4SampleResonance.cc