#include <G4NuMuNucleusNcModel.hh>

Inheritance diagram for G4NuMuNucleusNcModel:

Public Member Functions
	G4NuMuNucleusNcModel (const G4String &name="NuMuNuclNcModel")

virtual	~G4NuMuNucleusNcModel ()

virtual void	InitialiseModel ()

virtual G4bool	IsApplicable (const G4HadProjectile &aTrack, G4Nucleus &targetNucleus)

virtual G4HadFinalState *	ApplyYourself (const G4HadProjectile &aTrack, G4Nucleus &targetNucleus)

void	SampleLVkr (const G4HadProjectile &aTrack, G4Nucleus &targetNucleus)

G4double	GetMinNuMuEnergy ()

G4double	ThresholdEnergy (G4double mI, G4double mF, G4double mP)

virtual void	ModelDescription (std::ostream &) const

Public Member Functions inherited from G4NeutrinoNucleusModel
	G4NeutrinoNucleusModel (const G4String &name="neutrino-nucleus")

virtual	~G4NeutrinoNucleusModel ()

G4double	SampleXkr (G4double energy)

G4double	GetXkr (G4int iEnergy, G4double prob)

G4double	SampleQkr (G4double energy, G4double xx)

G4double	GetQkr (G4int iE, G4int jX, G4double prob)

void	ClusterDecay (G4LorentzVector &lvX, G4int qX)

void	MesonDecay (G4LorentzVector &lvX, G4int qX)

void	FinalBarion (G4LorentzVector &lvB, G4int qB, G4int pdgB)

void	RecoilDeexcitation (G4Fragment &fragment)

void	FinalMeson (G4LorentzVector &lvM, G4int qM, G4int pdgM)

void	CoherentPion (G4LorentzVector &lvP, G4int pdgP, G4Nucleus &targetNucleus)

void	SetCutEnergy (G4double ec)

G4double	GetCutEnergy ()

G4double	GetNuEnergy ()

G4double	GetQtransfer ()

G4double	GetQ2 ()

G4double	GetXsample ()

G4int	GetPDGencoding ()

G4bool	GetCascade ()

G4bool	GetString ()

G4double	GetCosTheta ()

G4double	GetEmu ()

G4double	GetEx ()

G4double	GetMuMass ()

G4double	GetW2 ()

G4double	GetM1 ()

G4double	GetMr ()

G4double	GetTr ()

G4double	GetDp ()

G4bool	GetfBreak ()

G4bool	GetfCascade ()

G4bool	GetfString ()

G4LorentzVector	GetLVl ()

G4LorentzVector	GetLVh ()

G4LorentzVector	GetLVt ()

G4LorentzVector	GetLVcpi ()

G4double	GetMinNuMuEnergy ()

G4double	ThresholdEnergy (G4double mI, G4double mF, G4double mP)

G4double	GetQEratioA ()

void	SetQEratioA (G4double qea)

G4double	FinalMomentum (G4double mI, G4double mF, G4double mP, G4LorentzVector lvX)

G4double	FermiMomentum (G4Nucleus &targetNucleus)

G4double	NucleonMomentum (G4Nucleus &targetNucleus)

G4double	GetEx (G4int A, G4bool fP)

G4double	GgSampleNM (G4Nucleus &nucl)

G4int	GetEnergyIndex (G4double energy)

G4double	GetNuMuQeTotRat (G4int index, G4double energy)

G4int	GetOnePionIndex (G4double energy)

G4double	GetNuMuOnePionProb (G4int index, G4double energy)

G4double	CalculateQEratioA (G4int Z, G4int A, G4double energy, G4int nepdg)

Public Member Functions inherited from G4HadronicInteraction
	G4HadronicInteraction (const G4String &modelName="HadronicModel")

virtual	~G4HadronicInteraction ()

virtual G4double	SampleInvariantT (const G4ParticleDefinition *p, G4double plab, G4int Z, G4int A)

G4double	GetMinEnergy () const

G4double	GetMinEnergy (const G4Material aMaterial, const G4Element anElement) const

void	SetMinEnergy (G4double anEnergy)

void	SetMinEnergy (G4double anEnergy, const G4Element *anElement)

void	SetMinEnergy (G4double anEnergy, const G4Material *aMaterial)

G4double	GetMaxEnergy () const

G4double	GetMaxEnergy (const G4Material aMaterial, const G4Element anElement) const

void	SetMaxEnergy (const G4double anEnergy)

void	SetMaxEnergy (G4double anEnergy, const G4Element *anElement)

void	SetMaxEnergy (G4double anEnergy, const G4Material *aMaterial)

G4int	GetVerboseLevel () const

void	SetVerboseLevel (G4int value)

const G4String &	GetModelName () const

void	DeActivateFor (const G4Material *aMaterial)

void	ActivateFor (const G4Material *aMaterial)

void	DeActivateFor (const G4Element *anElement)

void	ActivateFor (const G4Element *anElement)

G4bool	IsBlocked (const G4Material *aMaterial) const

G4bool	IsBlocked (const G4Element *anElement) const

void	SetRecoilEnergyThreshold (G4double val)

G4double	GetRecoilEnergyThreshold () const

virtual const std::pair< G4double, G4double >	GetFatalEnergyCheckLevels () const

virtual std::pair< G4double, G4double >	GetEnergyMomentumCheckLevels () const

void	SetEnergyMomentumCheckLevels (G4double relativeLevel, G4double absoluteLevel)

virtual void	BuildPhysicsTable (const G4ParticleDefinition &)

	G4HadronicInteraction (const G4HadronicInteraction &right)=delete

const G4HadronicInteraction &	operator= (const G4HadronicInteraction &right)=delete

G4bool	operator== (const G4HadronicInteraction &right) const =delete

G4bool	operator!= (const G4HadronicInteraction &right) const =delete

Additional Inherited Members
Protected Member Functions inherited from G4HadronicInteraction
void	SetModelName (const G4String &nam)

G4bool	IsBlocked () const

void	Block ()

Protected Attributes inherited from G4NeutrinoNucleusModel
G4ParticleDefinition *	theMuonMinus

G4ParticleDefinition *	theMuonPlus

G4double	fSin2tW

G4double	fCutEnergy

G4int	fNbin

G4int	fIndex

G4int	fEindex

G4int	fXindex

G4int	fQindex

G4int	fOnePionIndex

G4int	fPDGencoding

G4bool	fCascade

G4bool	fString

G4bool	fProton

G4bool	f2p2h

G4bool	fBreak

G4double	fNuEnergy

G4double	fQ2

G4double	fQtransfer

G4double	fXsample

G4double	fM1

G4double	fM2

G4double	fMt

G4double	fMu

G4double	fW2

G4double	fMpi

G4double	fW2pi

G4double	fMinNuEnergy

G4double	fDp

G4double	fTr

G4double	fEmu

G4double	fEmuPi

G4double	fEx

G4double	fMr

G4double	fCosTheta

G4double	fCosThetaPi

G4double	fQEratioA

G4LorentzVector	fLVh

G4LorentzVector	fLVl

G4LorentzVector	fLVt

G4LorentzVector	fLVcpi

G4GeneratorPrecompoundInterface *	fPrecoInterface

G4PreCompoundModel *	fPreCompound

G4ExcitationHandler *	fDeExcitation

G4Nucleus *	fRecoil

G4int	fSecID

Protected Attributes inherited from G4HadronicInteraction
G4HadFinalState	theParticleChange

G4int	verboseLevel

G4double	theMinEnergy

G4double	theMaxEnergy

G4bool	isBlocked

Static Protected Attributes inherited from G4NeutrinoNucleusModel
static const G4int	fResNumber = 6

static const G4double	fResMass [6]

static const G4int	fClustNumber = 4

static const G4double	fMesMass [4] = {1260., 980., 770., 139.57}

static const G4int	fMesPDG [4] = {20213, 9000211, 213, 211}

static const G4double	fBarMass [4] = {1700., 1600., 1232., 939.57}

static const G4int	fBarPDG [4] = {12224, 32224, 2224, 2212}

static const G4double	fNuMuResQ [50][50]

static const G4double	fNuMuEnergy [50]

static const G4double	fNuMuQeTotRat [50]

static const G4double	fOnePionEnergy [58]

static const G4double	fOnePionProb [58]

static const G4double	fNuMuEnergyLogVector [50]

static G4double	fNuMuXarrayKR [50][51] = {{1.0}}

static G4double	fNuMuXdistrKR [50][50] = {{1.0}}

static G4double	fNuMuQarrayKR [50][51][51] = {{{1.0}}}

static G4double	fNuMuQdistrKR [50][51][50] = {{{1.0}}}

static const G4double	fQEnergy [50]

static const G4double	fANeMuQEratio [50]

static const G4double	fNeMuQEratio [50]

Detailed Description

Definition at line 60 of file G4NuMuNucleusNcModel.hh.

Constructor & Destructor Documentation

◆ G4NuMuNucleusNcModel()

G4NuMuNucleusNcModel::G4NuMuNucleusNcModel ( const G4String & name = "NuMuNuclNcModel" )

Definition at line 68 of file G4NuMuNucleusNcModel.cc.

  : G4NeutrinoNucleusModel(name)
{
  SetMinEnergy( 0.0*GeV );
  SetMaxEnergy( 100.*TeV );
  SetMinEnergy(1.e-6*eV);
 
  theNuMu =  G4NeutrinoMu::NeutrinoMu();
  theANuMu =  G4AntiNeutrinoMu::AntiNeutrinoMu();
 
  fMnumu = 0.; 
  fData = fMaster = false;
  InitialiseModel();  
     
}

◆ ~G4NuMuNucleusNcModel()

G4NuMuNucleusNcModel::~G4NuMuNucleusNcModel ( )

virtual

Definition at line 85 of file G4NuMuNucleusNcModel.cc.

86{}

Member Function Documentation

◆ ApplyYourself()

G4HadFinalState * G4NuMuNucleusNcModel::ApplyYourself	(	const G4HadProjectile &	aTrack,
		G4Nucleus &	targetNucleus )

virtual

Implements G4NeutrinoNucleusModel.

Definition at line 220 of file G4NuMuNucleusNcModel.cc.

{
  theParticleChange.Clear();
  fProton = f2p2h = fBreak = false;
  const G4HadProjectile* aParticle = &aTrack;
  G4double energy = aParticle->GetTotalEnergy();
 
  G4String pName  = aParticle->GetDefinition()->GetParticleName();
 
  if( energy < fMinNuEnergy ) 
  {
    theParticleChange.SetEnergyChange(energy);
    theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
    return &theParticleChange;
  }
  SampleLVkr( aTrack, targetNucleus);
 
  if( fBreak == true || fEmu < fMnumu ) // ~5*10^-6
  {
    // G4cout<<"ni, ";
    theParticleChange.SetEnergyChange(energy);
    theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
    return &theParticleChange;
  }
 
  // LVs of initial state
 
  G4LorentzVector lvp1 = aParticle->Get4Momentum();
  G4LorentzVector lvt1( 0., 0., 0., fM1 );
  G4double mPip = G4ParticleTable::GetParticleTable()->FindParticle(211)->GetPDGMass();
 
  // 1-pi by fQtransfer && nu-energy
  G4LorentzVector lvpip1( 0., 0., 0., mPip );
  G4LorentzVector lvsum, lv2, lvX;
  G4ThreeVector eP;
  G4double cost(1.), sint(0.), phi(0.), muMom(0.), massX2(0.);
  G4DynamicParticle* aLept = nullptr; // lepton lv
 
  G4int Z = targetNucleus.GetZ_asInt();
  G4int A = targetNucleus.GetA_asInt();
  G4double  mTarg = targetNucleus.AtomicMass(A,Z);
  G4int pdgP(0), qB(0);
  // G4double mSum = G4ParticleTable::GetParticleTable()->FindParticle(2212)->GetPDGMass() + mPip;
 
  G4int iPi     = GetOnePionIndex(energy);
  G4double p1pi = GetNuMuOnePionProb( iPi, energy);
 
  if( p1pi > G4UniformRand() && fCosTheta > 0.9  ) // && fQtransfer < 0.95*GeV ) // mu- & coherent pion + nucleus
  {
    // lvsum = lvp1 + lvpip1;
    lvsum = lvp1 + lvt1;
    // cost = fCosThetaPi;
    cost = fCosTheta;
    sint = std::sqrt( (1.0 - cost)*(1.0 + cost) );
    phi  = G4UniformRand()*CLHEP::twopi;
    eP   = G4ThreeVector( sint*std::cos(phi), sint*std::sin(phi), cost );
 
    // muMom = sqrt(fEmuPi*fEmuPi-fMnumu*fMnumu);
    muMom = sqrt(fEmu*fEmu-fMnumu*fMnumu);
 
    eP *= muMom;
 
    // lv2 = G4LorentzVector( eP, fEmuPi );
    lv2 = G4LorentzVector( eP, fEmu );
    lv2 = fLVl;
 
    lvX = lvsum - lv2;
    lvX = fLVh;
    massX2 = lvX.m2();
    G4double massX = lvX.m();
    G4double massR = fLVt.m();
 
    // if ( massX2 <= 0. ) // vmg: very rarely ~ (1-4)e-6 due to big Q2/x, to be improved
    if ( massX2 <= fM1*fM1 ) // 9-3-20 vmg: very rarely ~ (1-4)e-6 due to big Q2/x, to be improved
      if ( lvX.e() <= fM1 ) // 9-3-20 vmg: very rarely ~ (1-4)e-6 due to big Q2/x, to be improved
    {
      theParticleChange.SetEnergyChange(energy);
      theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
      return &theParticleChange;
    }
    fW2 = massX2;
 
    if(  pName == "nu_mu" )         aLept = new G4DynamicParticle( theNuMu, lv2 );  
    else if( pName == "anti_nu_mu") aLept = new G4DynamicParticle( theANuMu,  lv2 );
    else
    {
      theParticleChange.SetEnergyChange(energy);
      theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
      return &theParticleChange;
    } 
 
    pdgP = 111;
 
    G4double eCut; // = fMpi + 0.5*(fMpi*fMpi - massX2)/mTarg; // massX -> fMpi
 
    if( A > 1 )
    {
      eCut = (fMpi + mTarg)*(fMpi + mTarg) - (massX + massR)*(massX + massR);
      eCut /= 2.*massR;
      eCut += massX;
    }
    else  eCut = fM1 + fMpi;
 
    if ( lvX.e() > eCut ) // && sqrt( GetW2() ) < 1.4*GeV ) // 
    {
      CoherentPion( lvX, pdgP, targetNucleus);
    }
    else
    {
      theParticleChange.SetEnergyChange(energy);
      theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
      return &theParticleChange;
    } 
    theParticleChange.AddSecondary( aLept, fSecID );
 
    return &theParticleChange;
  }
  else // lepton part in lab
  { 
    lvsum = lvp1 + lvt1;
    cost = fCosTheta;
    sint = std::sqrt( (1.0 - cost)*(1.0 + cost) );
    phi  = G4UniformRand()*CLHEP::twopi;
    eP   = G4ThreeVector( sint*std::cos(phi), sint*std::sin(phi), cost );
 
    muMom = sqrt(fEmu*fEmu-fMnumu*fMnumu);
 
    eP *= muMom;
 
    lv2 = G4LorentzVector( eP, fEmu );
 
    lvX = lvsum - lv2;
 
    massX2 = lvX.m2();
 
    if ( massX2 <= 0. ) // vmg: very rarely ~ (1-4)e-6 due to big Q2/x, to be improved
    {
      theParticleChange.SetEnergyChange(energy);
      theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
      return &theParticleChange;
    }
    fW2 = massX2;
 
    aLept = new G4DynamicParticle( theNuMu, lv2 );  
  
    theParticleChange.AddSecondary( aLept, fSecID );
  }
 
  // hadron part
 
  fRecoil  = nullptr;
  fCascade = false;
  fString  = false;
  
  if( A == 1 )
  {
    qB = 1;
 
    // if( G4UniformRand() > 0.1 ) //  > 0.9999 ) // > 0.0001 ) //
    {
      ClusterDecay( lvX, qB );
    }
    return &theParticleChange;
  }
  G4Nucleus recoil;
  G4double rM(0.), ratio = G4double(Z)/G4double(A);
 
  if( ratio > G4UniformRand() ) // proton is excited
  {
    fProton = true;
    recoil = G4Nucleus(A-1,Z-1);
    fRecoil = &recoil;
    rM = recoil.AtomicMass(A-1,Z-1);
 
    fMt = G4ParticleTable::GetParticleTable()->FindParticle(2212)->GetPDGMass()
          + G4ParticleTable::GetParticleTable()->FindParticle(111)->GetPDGMass();
  }
  else // excited neutron
  {
    fProton = false;
    recoil = G4Nucleus(A-1,Z);
    fRecoil = &recoil;
    rM = recoil.AtomicMass(A-1,Z);
 
    fMt = G4ParticleTable::GetParticleTable()->FindParticle(2112)->GetPDGMass()
          + G4ParticleTable::GetParticleTable()->FindParticle(111)->GetPDGMass(); 
  }
  // G4int       index = GetEnergyIndex(energy);
  G4int nepdg = aParticle->GetDefinition()->GetPDGEncoding();
 
  G4double qeTotRat; //  = GetNuMuQeTotRat(index, energy);
  qeTotRat = CalculateQEratioA( Z, A, energy, nepdg);
 
  G4ThreeVector dX = (lvX.vect()).unit();
  G4double eX   = lvX.e();  // excited nucleon
  G4double mX   = sqrt(massX2);
 
  if( qeTotRat > G4UniformRand() || mX <= fMt ) // || eX <= 1232.*MeV) // QE
  {  
    fString = false;
 
    if( fProton ) 
    {  
      fPDGencoding = 2212;
      fMr =  proton_mass_c2;
      recoil = G4Nucleus(A-1,Z-1);
      fRecoil = &recoil;
      rM = recoil.AtomicMass(A-1,Z-1);
    } 
    else
    {  
      fPDGencoding = 2112;
      fMr =   G4ParticleTable::GetParticleTable()->
    FindParticle(fPDGencoding)->GetPDGMass(); // 939.5654133*MeV;
      recoil = G4Nucleus(A-1,Z);
      fRecoil = &recoil;
      rM = recoil.AtomicMass(A-1,Z);
    } 
    G4double eTh = fMr+0.5*(fMr*fMr-mX*mX)/rM;
 
    if(eX <= eTh) // vmg, very rarely out of kinematics
    {
      theParticleChange.SetEnergyChange(energy);
      theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
      return &theParticleChange;
    } 
    FinalBarion( lvX, 0, fPDGencoding ); // p(n)+deexcited recoil
  }
  else // if ( eX < 9500000.*GeV ) // < 25.*GeV) //  < 95.*GeV ) // < 2.5*GeV ) //cluster decay
  {  
    if     (  fProton && pName == "nu_mu" )      qB =  1;
    else if( !fProton && pName == "nu_mu" )      qB =  0;
 
    ClusterDecay( lvX, qB );
  }
  return &theParticleChange;
}

◆ GetMinNuMuEnergy()

G4double G4NuMuNucleusNcModel::GetMinNuMuEnergy ( )

inline

Definition at line 81 of file G4NuMuNucleusNcModel.hh.

81{ return fMnumu + 0.5*fMnumu*fMnumu/fM1 + 4.*CLHEP::keV; }; // kinematics + accuracy for sqrts

◆ InitialiseModel()

void G4NuMuNucleusNcModel::InitialiseModel ( )

virtual

Reimplemented from G4HadronicInteraction.

Definition at line 102 of file G4NuMuNucleusNcModel.cc.

{
  G4String pName  = "nu_mu";
  
  G4int nSize(0), i(0), j(0), k(0);
 
  if(!fData)
  { 
#ifdef G4MULTITHREADED
    G4MUTEXLOCK(&numuNucleusModel);
    if(!fData)
    { 
#endif     
      fMaster = true;
#ifdef G4MULTITHREADED
    }
    G4MUTEXUNLOCK(&numuNucleusModel);
#endif
  }
 
  if(fMaster)
  {  
    const char* path = G4FindDataDir("G4PARTICLEXSDATA");
    std::ostringstream ost1, ost2, ost3, ost4;
    ost1 << path << "/" << "neutrino" << "/" << pName << "/xarraynckr";
 
    std::ifstream filein1( ost1.str().c_str() );
 
    // filein.open("$PARTICLEXSDATA/");
 
    filein1>>nSize;
 
    for( k = 0; k < fNbin; ++k )
    {
      for( i = 0; i <= fNbin; ++i )
      {
        filein1 >> fNuMuXarrayKR[k][i];
        // G4cout<< fNuMuXarrayKR[k][i] << "  ";
      }
    }
    // G4cout<<G4endl<<G4endl;
 
    ost2 << path << "/" << "neutrino" << "/" << pName << "/xdistrnckr";
    std::ifstream  filein2( ost2.str().c_str() );
 
    filein2>>nSize;
 
    for( k = 0; k < fNbin; ++k )
    {
      for( i = 0; i < fNbin; ++i )
      {
        filein2 >> fNuMuXdistrKR[k][i];
        // G4cout<< fNuMuXdistrKR[k][i] << "  ";
      }
    }
    // G4cout<<G4endl<<G4endl;
 
    ost3 << path << "/" << "neutrino" << "/" << pName << "/q2arraynckr";
    std::ifstream  filein3( ost3.str().c_str() );
 
    filein3>>nSize;
 
    for( k = 0; k < fNbin; ++k )
    {
      for( i = 0; i <= fNbin; ++i )
      {
        for( j = 0; j <= fNbin; ++j )
        {
          filein3 >> fNuMuQarrayKR[k][i][j];
          // G4cout<< fNuMuQarrayKR[k][i][j] << "  ";
        }
      }
    }
    // G4cout<<G4endl<<G4endl;
 
    ost4 << path << "/" << "neutrino" << "/" << pName << "/q2distrnckr";
    std::ifstream  filein4( ost4.str().c_str() );
 
    filein4>>nSize;
 
    for( k = 0; k < fNbin; ++k )
    {
      for( i = 0; i <= fNbin; ++i )
      {
        for( j = 0; j < fNbin; ++j )
        {
          filein4 >> fNuMuQdistrKR[k][i][j];
          // G4cout<< fNuMuQdistrKR[k][i][j] << "  ";
        }
      }
    }
    fData = true;
  }
}

Referenced by G4NuMuNucleusNcModel().

◆ IsApplicable()

G4bool G4NuMuNucleusNcModel::IsApplicable	(	const G4HadProjectile &	aTrack,
		G4Nucleus &	targetNucleus )

virtual

Reimplemented from G4NeutrinoNucleusModel.

Definition at line 199 of file G4NuMuNucleusNcModel.cc.

{
  G4bool result  = false;
  G4String pName = aPart.GetDefinition()->GetParticleName();
  G4double energy = aPart.GetTotalEnergy();
  
  if(  pName == "nu_mu" // || pName == "anti_nu_mu"   ) 
        &&
        energy > fMinNuEnergy                                )
  {
    result = true;
  }
 
  return result;
}

◆ ModelDescription()

void G4NuMuNucleusNcModel::ModelDescription ( std::ostream & outFile ) const

virtual

Reimplemented from G4NeutrinoNucleusModel.

Definition at line 89 of file G4NuMuNucleusNcModel.cc.

{
 
    outFile << "G4NuMuNucleusNcModel is a neutrino-nucleus (neutral current) scattering\n"
            << "model which uses the standard model \n"
            << "transfer parameterization.  The model is fully relativistic\n";
 
}

◆ SampleLVkr()

void G4NuMuNucleusNcModel::SampleLVkr	(	const G4HadProjectile &	aTrack,
		G4Nucleus &	targetNucleus )

Definition at line 468 of file G4NuMuNucleusNcModel.cc.

{
  fBreak = false;
  G4int A = targetNucleus.GetA_asInt(), iTer(0), iTerMax(100); 
  G4int Z = targetNucleus.GetZ_asInt(); 
  G4double e3(0.), pMu2(0.), pX2(0.), nMom(0.), rM(0.), hM(0.), tM = targetNucleus.AtomicMass(A,Z);
  G4double cost(1.), sint(0.), phi(0.), muMom(0.); 
  G4ThreeVector eP, bst;
  const G4HadProjectile* aParticle = &aTrack;
  G4LorentzVector lvp1 = aParticle->Get4Momentum();
  nMom = NucleonMomentum( targetNucleus );
 
  if( A == 1 || nMom == 0. ) // hydrogen, no Fermi motion ???
  {
    fNuEnergy = aParticle->GetTotalEnergy();
    iTer = 0;
 
    do
    {
      fXsample = SampleXkr(fNuEnergy);
      fQtransfer = SampleQkr(fNuEnergy, fXsample);
      fQ2 = fQtransfer*fQtransfer;
 
     if( fXsample > 0. )
      {
        fW2 = fM1*fM1 - fQ2 + fQ2/fXsample; // sample excited hadron mass
        fEmu = fNuEnergy - fQ2/2./fM1/fXsample;
      }
      else
      {
        fW2 = fM1*fM1;
        fEmu = fNuEnergy;
      }
      e3 = fNuEnergy + fM1 - fEmu;
 
      // if( e3 < sqrt(fW2) )  G4cout<<"energyX = "<<e3/GeV<<", fW = "<<sqrt(fW2)/GeV<<G4endl; // vmg ~10^-5 for NC
    
      pMu2 = fEmu*fEmu - fMnumu*fMnumu;
      pX2  = e3*e3 - fW2;
 
      fCosTheta  = fNuEnergy*fNuEnergy  + pMu2 - pX2;
      fCosTheta /= 2.*fNuEnergy*sqrt(pMu2);
      iTer++;
    }
    while( ( abs(fCosTheta) > 1. || fEmu < fMnumu ) && iTer < iTerMax );
 
    if( iTer >= iTerMax ) { fBreak = true; return; }
 
    if( abs(fCosTheta) > 1.) // vmg: due to big Q2/x values. To be improved ...
    { 
      G4cout<<"H2: fCosTheta = "<<fCosTheta<<", fEmu = "<<fEmu<<G4endl;
      // fCosTheta = -1. + 2.*G4UniformRand(); 
      if(fCosTheta < -1.) fCosTheta = -1.;
      if(fCosTheta >  1.) fCosTheta =  1.;
    }
    // LVs
 
    G4LorentzVector lvt1  = G4LorentzVector( 0., 0., 0., fM1 );
    G4LorentzVector lvsum = lvp1 + lvt1;
 
    cost = fCosTheta;
    sint = std::sqrt( (1.0 - cost)*(1.0 + cost) );
    phi  = G4UniformRand()*CLHEP::twopi;
    eP   = G4ThreeVector( sint*std::cos(phi), sint*std::sin(phi), cost );
    muMom = sqrt(fEmu*fEmu-fMnumu*fMnumu);
    eP *= muMom;
    fLVl = G4LorentzVector( eP, fEmu );
 
    fLVh = lvsum - fLVl;
    fLVt = G4LorentzVector( 0., 0., 0., 0. ); // no recoil
  }
  else // Fermi motion, Q2 in nucleon rest frame
  {
    G4ThreeVector nMomDir = nMom*G4RandomDirection();
 
    if( !f2p2h ) // 1p1h
    {
      G4Nucleus recoil(A-1,Z);
      rM = sqrt( recoil.AtomicMass(A-1,Z)*recoil.AtomicMass(A-1,Z) + nMom*nMom );
      hM = tM - rM;
 
      fLVt = G4LorentzVector( nMomDir, sqrt( rM*rM+nMom*nMom ) );
      fLVh = G4LorentzVector(-nMomDir, sqrt( hM*hM+nMom*nMom ) ); 
    }
    else // 2p2h
    {
      G4Nucleus recoil(A-2,Z-1);
      rM = recoil.AtomicMass(A-2,Z-1)+sqrt(nMom*nMom+fM1*fM1);
      hM = tM - rM;
 
      fLVt = G4LorentzVector( nMomDir, sqrt( rM*rM+nMom*nMom ) );
      fLVh = G4LorentzVector(-nMomDir, sqrt( hM*hM+nMom*nMom ) ); 
    }
    // G4cout<<hM<<", ";
    // bst = fLVh.boostVector(); // 9-3-20
 
    // lvp1.boost(-bst); // 9-3-20 -> nucleon rest system, where Q2 transfer is ???
 
    fNuEnergy  = lvp1.e();
    iTer = 0;
 
    do
    {
      fXsample = SampleXkr(fNuEnergy);
      fQtransfer = SampleQkr(fNuEnergy, fXsample);
      fQ2 = fQtransfer*fQtransfer;
 
      if( fXsample > 0. )
      {
        fW2 = fM1*fM1 - fQ2 + fQ2/fXsample; // sample excited hadron mass
        fEmu = fNuEnergy - fQ2/2./fM1/fXsample;
      }
      else
      {
        fW2 = fM1*fM1;
        fEmu = fNuEnergy;
      }
 
      // if(fEmu < 0.) G4cout<<"fEmu = "<<fEmu<<" hM = "<<hM<<G4endl;
 
      e3 = fNuEnergy + fM1 - fEmu;
 
      // if( e3 < sqrt(fW2) )  G4cout<<"energyX = "<<e3/GeV<<", fW = "<<sqrt(fW2)/GeV<<G4endl;
    
      pMu2 = fEmu*fEmu - fMnumu*fMnumu;
      pX2  = e3*e3 - fW2;
 
      fCosTheta  = fNuEnergy*fNuEnergy  + pMu2 - pX2;
      fCosTheta /= 2.*fNuEnergy*sqrt(pMu2);
      iTer++;
    }
    while( ( abs(fCosTheta) > 1. || fEmu < fMnumu ) && iTer < iTerMax );
 
    if( iTer >= iTerMax ) { fBreak = true; return; }
 
    if( abs(fCosTheta) > 1.) // vmg: due to big Q2/x values. To be improved ...
    { 
      G4cout<<"FM: fCosTheta = "<<fCosTheta<<", fEmu = "<<fEmu<<G4endl;
      // fCosTheta = -1. + 2.*G4UniformRand(); 
      if(fCosTheta < -1.) fCosTheta = -1.;
      if(fCosTheta >  1.) fCosTheta =  1.;
    }
    // LVs
    G4LorentzVector lvt1  = G4LorentzVector( 0., 0., 0., fM1 );
    G4LorentzVector lvsum = lvp1 + lvt1;
 
    cost = fCosTheta;
    sint = std::sqrt( (1.0 - cost)*(1.0 + cost) );
    phi  = G4UniformRand()*CLHEP::twopi;
    eP   = G4ThreeVector( sint*std::cos(phi), sint*std::sin(phi), cost );
    muMom = sqrt(fEmu*fEmu-fMnumu*fMnumu);
    eP *= muMom;
    fLVl = G4LorentzVector( eP, fEmu );
    fLVh = lvsum - fLVl;
    // back to lab system
    // fLVl.boost(bst); // 9-3-20
    // fLVh.boost(bst); // 9-3-20
  }
  //G4cout<<iTer<<", "<<fBreak<<"; ";
}

Referenced by ApplyYourself().

◆ ThresholdEnergy()

G4double G4NuMuNucleusNcModel::ThresholdEnergy	(	G4double	mI,
		G4double	mF,
		G4double	mP )

inline

Definition at line 83 of file G4NuMuNucleusNcModel.hh.

  { 
    G4double w = std::sqrt(fW2);
    return w + 0.5*( (mP+mF)*(mP+mF)-(w+mI)*(w+mI) )/mI;
  };

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

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ G4NuMuNucleusNcModel()

◆ ~G4NuMuNucleusNcModel()

Member Function Documentation

◆ ApplyYourself()

◆ GetMinNuMuEnergy()

◆ InitialiseModel()

◆ IsApplicable()

◆ ModelDescription()

◆ SampleLVkr()

◆ ThresholdEnergy()