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G4TauLeptonicDecayChannel Class Reference

#include <G4TauLeptonicDecayChannel.hh>

Inheritance diagram for G4TauLeptonicDecayChannel:
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Public Member Functions

 G4TauLeptonicDecayChannel (const G4String &theParentName, G4double theBR, const G4String &theLeptonName)
 
virtual ~G4TauLeptonicDecayChannel ()
 
virtual G4DecayProducts * DecayIt (G4double)
 
- Public Member Functions inherited from G4VDecayChannel
 G4VDecayChannel (const G4String &aName, G4int Verbose=1)
 
 G4VDecayChannel (const G4String &aName, const G4String &theParentName, G4double theBR, G4int theNumberOfDaughters, const G4String &theDaughterName1, const G4String &theDaughterName2="", const G4String &theDaughterName3="", const G4String &theDaughterName4="")
 
virtual ~G4VDecayChannel ()
 
G4int operator== (const G4VDecayChannel &right) const
 
G4int operator!= (const G4VDecayChannel &right) const
 
G4int operator< (const G4VDecayChannel &right) const
 
const G4String & GetKinematicsName () const
 
G4double GetBR () const
 
G4int GetNumberOfDaughters () const
 
G4ParticleDefinition * GetParent ()
 
G4ParticleDefinition * GetDaughter (G4int anIndex)
 
G4int GetAngularMomentum ()
 
const G4String & GetParentName () const
 
const G4String & GetDaughterName (G4int anIndex) const
 
G4double GetParentMass () const
 
G4double GetDaughterMass (G4int anIndex) const
 
void SetParent (const G4ParticleDefinition *particle_type)
 
void SetParent (const G4String &particle_name)
 
void SetBR (G4double value)
 
void SetNumberOfDaughters (G4int value)
 
void SetDaughter (G4int anIndex, const G4ParticleDefinition *particle_type)
 
void SetDaughter (G4int anIndex, const G4String &particle_name)
 
void SetVerboseLevel (G4int value)
 
G4int GetVerboseLevel () const
 
void DumpInfo ()
 
G4double GetRangeMass () const
 
void SetRangeMass (G4double val)
 
virtual G4bool IsOKWithParentMass (G4double parentMass)
 
void SetPolarization (const G4ThreeVector &)
 
const G4ThreeVector & GetPolarization () const
 

Protected Member Functions

 G4TauLeptonicDecayChannel (const G4TauLeptonicDecayChannel &)
 
G4TauLeptonicDecayChannel & operator= (const G4TauLeptonicDecayChannel &)
 
 G4TauLeptonicDecayChannel ()
 
- Protected Member Functions inherited from G4VDecayChannel
void ClearDaughtersName ()
 
void CheckAndFillDaughters ()
 
void CheckAndFillParent ()
 
 G4VDecayChannel ()
 
 G4VDecayChannel (const G4VDecayChannel &)
 
G4VDecayChannel & operator= (const G4VDecayChannel &)
 
G4double DynamicalMass (G4double massPDG, G4double width, G4double maxDev=+1.) const
 

Additional Inherited Members

- Protected Attributes inherited from G4VDecayChannel
G4String kinematics_name
 
G4double rbranch
 
G4int numberOfDaughters
 
G4String * parent_name
 
G4String ** daughters_name
 
G4double rangeMass
 
G4ThreeVector parent_polarization
 
G4ParticleTable * particletable
 
G4int verboseLevel
 
G4ParticleDefinition * G4MT_parent
 
G4ParticleDefinition ** G4MT_daughters
 
G4double G4MT_parent_mass
 
G4double * G4MT_daughters_mass
 
G4double * G4MT_daughters_width
 
G4Mutex daughtersMutex
 
G4Mutex parentMutex
 
- Static Protected Attributes inherited from G4VDecayChannel
static const G4String noName = " "
 

Detailed Description

Definition at line 43 of file G4TauLeptonicDecayChannel.hh.

Constructor & Destructor Documentation

G4TauLeptonicDecayChannel::G4TauLeptonicDecayChannel ( const G4String &  theParentName,
G4double  theBR,
const G4String &  theLeptonName 
)

Definition at line 56 of file G4TauLeptonicDecayChannel.cc.

60  :G4VDecayChannel("Tau Leptonic Decay",1)
61 {
62  // set names for daughter particles
63  if (theParentName == "tau+") {
64  SetBR(theBR);
65  SetParent("tau+");
66  SetNumberOfDaughters(3);
67  if ((theLeptonName=="e-"||theLeptonName=="e+")){
68  SetDaughter(0, "e+");
69  SetDaughter(1, "nu_e");
70  SetDaughter(2, "anti_nu_tau");
71  } else {
72  SetDaughter(0, "mu+");
73  SetDaughter(1, "nu_mu");
74  SetDaughter(2, "anti_nu_tau");
75  }
76  } else if (theParentName == "tau-") {
77  SetBR(theBR);
78  SetParent("tau-");
79  SetNumberOfDaughters(3);
80  if ((theLeptonName=="e-"||theLeptonName=="e+")){
81  SetDaughter(0, "e-");
82  SetDaughter(1, "anti_nu_e");
83  SetDaughter(2, "nu_tau");
84  } else {
85  SetDaughter(0, "mu-");
86  SetDaughter(1, "anti_nu_mu");
87  SetDaughter(2, "nu_tau");
88  }
89  } else {
90 #ifdef G4VERBOSE
91  if (GetVerboseLevel()>0) {
92  G4cout << "G4TauLeptonicDecayChannel:: constructor :";
93  G4cout << " parent particle is not tau but ";
94  G4cout << theParentName << G4endl;
95  }
96 #endif
97  }
98 }
G4VDecayChannel::SetBR
void SetBR(G4double value)
Definition: G4VDecayChannel.hh:294
G4cout
G4GLOB_DLL std::ostream G4cout
G4VDecayChannel::SetNumberOfDaughters
void SetNumberOfDaughters(G4int value)
Definition: G4VDecayChannel.cc:257
G4VDecayChannel::GetVerboseLevel
G4int GetVerboseLevel() const
Definition: G4VDecayChannel.hh:303
G4VDecayChannel::SetParent
void SetParent(const G4ParticleDefinition *particle_type)
Definition: G4VDecayChannel.cc:485
G4VDecayChannel::SetDaughter
void SetDaughter(G4int anIndex, const G4ParticleDefinition *particle_type)
Definition: G4VDecayChannel.cc:325
G4endl
#define G4endl
Definition: G4ios.hh:61

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G4TauLeptonicDecayChannel::~G4TauLeptonicDecayChannel ( )
virtual

Definition at line 100 of file G4TauLeptonicDecayChannel.cc.

101 {
102 }
G4TauLeptonicDecayChannel::G4TauLeptonicDecayChannel ( const G4TauLeptonicDecayChannel &  right)
protected

Definition at line 104 of file G4TauLeptonicDecayChannel.cc.

104  :
105  G4VDecayChannel(right)
106 {
107 }
G4TauLeptonicDecayChannel::G4TauLeptonicDecayChannel ( )
protected

Definition at line 50 of file G4TauLeptonicDecayChannel.cc.

51  :G4VDecayChannel()
52 {
53 }

Member Function Documentation

G4DecayProducts * G4TauLeptonicDecayChannel::DecayIt ( G4double  )
virtual

Implements G4VDecayChannel.

Definition at line 136 of file G4TauLeptonicDecayChannel.cc.

137 {
138  // this version neglects muon polarization
139  // assumes the pure V-A coupling
140  // gives incorrect energy spectrum for neutrinos
141 #ifdef G4VERBOSE
142  if (GetVerboseLevel()>1) G4cout << "G4TauLeptonicDecayChannel::DecayIt ";
143 #endif
144 
145  CheckAndFillParent();
146  CheckAndFillDaughters();
147 
148  // parent mass
149  G4double parentmass = G4MT_parent->GetPDGMass();
150 
151  //daughters'mass
152  const G4int N_DAUGHTER=3;
153  G4double daughtermass[N_DAUGHTER];
154  for (G4int index=0; index<N_DAUGHTER; index++){
155  daughtermass[index] = G4MT_daughters[index]->GetPDGMass();
156  }
157 
158  //create parent G4DynamicParticle at rest
159  G4ThreeVector dummy;
160  G4DynamicParticle * parentparticle = new G4DynamicParticle( G4MT_parent, dummy, 0.0);
161  //create G4Decayproducts
162  G4DecayProducts *products = new G4DecayProducts(*parentparticle);
163  delete parentparticle;
164 
165  // calculate daughter momentum
166  G4double daughtermomentum[N_DAUGHTER];
167 
168  // calcurate lepton momentum
169  G4double pmax = (parentmass*parentmass-daughtermass[0]*daughtermass[0])/2./parentmass;
170  G4double p, e;
171  G4double r;
172  const size_t MAX_LOOP=10000;
173  for (size_t loop_counter=0; loop_counter <MAX_LOOP; ++loop_counter){
174  // determine momentum/energy
175  r = G4UniformRand();
176  p = pmax*G4UniformRand();
177  e = std::sqrt(p*p + daughtermass[0]*daughtermass[0]);
178  if (r < spectrum(p,e,parentmass,daughtermass[0]) ) break;
179  }
180 
181  //create daughter G4DynamicParticle
182  // daughter 0 (lepton)
183  daughtermomentum[0] = p;
184  G4double costheta, sintheta, phi, sinphi, cosphi;
185  costheta = 2.*G4UniformRand()-1.0;
186  sintheta = std::sqrt((1.0-costheta)*(1.0+costheta));
187  phi = twopi*G4UniformRand()*rad;
188  sinphi = std::sin(phi);
189  cosphi = std::cos(phi);
190  G4ThreeVector direction0(sintheta*cosphi,sintheta*sinphi,costheta);
191  G4DynamicParticle * daughterparticle
192  = new G4DynamicParticle( G4MT_daughters[0], direction0*daughtermomentum[0]);
193  products->PushProducts(daughterparticle);
194 
195  // daughter 1 ,2 (nutrinos)
196  // create neutrinos in the C.M frame of two neutrinos
197  G4double energy2 = parentmass-e;
198  G4double vmass = std::sqrt((energy2-daughtermomentum[0])*(energy2+daughtermomentum[0]));
199  G4double beta = -1.0*daughtermomentum[0]/energy2;
200  G4double costhetan = 2.*G4UniformRand()-1.0;
201  G4double sinthetan = std::sqrt((1.0-costhetan)*(1.0+costhetan));
202  G4double phin = twopi*G4UniformRand()*rad;
203  G4double sinphin = std::sin(phin);
204  G4double cosphin = std::cos(phin);
205 
206  G4ThreeVector direction1(sinthetan*cosphin,sinthetan*sinphin,costhetan);
207  G4DynamicParticle * daughterparticle1
208  = new G4DynamicParticle( G4MT_daughters[1], direction1*(vmass/2.));
209  G4DynamicParticle * daughterparticle2
210  = new G4DynamicParticle( G4MT_daughters[2], direction1*(-1.0*vmass/2.));
211 
212  // boost to the muon rest frame
213  G4LorentzVector p4;
214  p4 = daughterparticle1->Get4Momentum();
215  p4.boost( direction0.x()*beta, direction0.y()*beta, direction0.z()*beta);
216  daughterparticle1->Set4Momentum(p4);
217  p4 = daughterparticle2->Get4Momentum();
218  p4.boost( direction0.x()*beta, direction0.y()*beta, direction0.z()*beta);
219  daughterparticle2->Set4Momentum(p4);
220  products->PushProducts(daughterparticle1);
221  products->PushProducts(daughterparticle2);
222  daughtermomentum[1] = daughterparticle1->GetTotalMomentum();
223  daughtermomentum[2] = daughterparticle2->GetTotalMomentum();
224 
225 
226  // output message
227 #ifdef G4VERBOSE
228  if (GetVerboseLevel()>1) {
229  G4cout << "G4TauLeptonicDecayChannel::DecayIt ";
230  G4cout << " create decay products in rest frame " <<G4endl;
231  products->DumpInfo();
232  }
233 #endif
234  return products;
235 }
G4VDecayChannel::CheckAndFillDaughters
void CheckAndFillDaughters()
Definition: G4VDecayChannel.hh:324
G4DecayProducts::PushProducts
G4int PushProducts(G4DynamicParticle *aParticle)
Definition: G4DecayProducts.cc:153
G4VDecayChannel::G4MT_parent
G4ParticleDefinition * G4MT_parent
Definition: G4VDecayChannel.hh:192
p
const char * p
Definition: xmltok.h:285
G4VDecayChannel::G4MT_daughters
G4ParticleDefinition ** G4MT_daughters
Definition: G4VDecayChannel.hh:193
rad
static constexpr double rad
Definition: G4SIunits.hh:149
G4int
int G4int
Definition: G4Types.hh:78
twopi
static constexpr double twopi
Definition: G4SIunits.hh:76
G4DynamicParticle::GetTotalMomentum
G4double GetTotalMomentum() const
G4UniformRand
#define G4UniformRand()
Definition: Randomize.hh:97
G4cout
G4GLOB_DLL std::ostream G4cout
G4DecayProducts::DumpInfo
void DumpInfo() const
Definition: G4DecayProducts.cc:311
CLHEP::HepLorentzVector::boost
HepLorentzVector & boost(double, double, double)
Definition: LorentzVector.cc:59
G4DynamicParticle::Get4Momentum
G4LorentzVector Get4Momentum() const
G4DynamicParticle::Set4Momentum
void Set4Momentum(const G4LorentzVector &momentum)
Definition: G4DynamicParticle.cc:385
G4VDecayChannel::GetVerboseLevel
G4int GetVerboseLevel() const
Definition: G4VDecayChannel.hh:303
G4ParticleDefinition::GetPDGMass
G4double GetPDGMass() const
Definition: G4ParticleDefinition.hh:122
G4endl
#define G4endl
Definition: G4ios.hh:61
G4double
double G4double
Definition: G4Types.hh:76

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G4TauLeptonicDecayChannel & G4TauLeptonicDecayChannel::operator= ( const G4TauLeptonicDecayChannel &  right)
protected

Definition at line 109 of file G4TauLeptonicDecayChannel.cc.

110 {
111  if (this != &right) {
112  kinematics_name = right.kinematics_name;
113  verboseLevel = right.verboseLevel;
114  rbranch = right.rbranch;
115 
116  // copy parent name
117  parent_name = new G4String(*right.parent_name);
118 
119  // clear daughters_name array
120  ClearDaughtersName();
121 
122  // recreate array
123  numberOfDaughters = right.numberOfDaughters;
124  if ( numberOfDaughters >0 ) {
125  if (daughters_name !=0) ClearDaughtersName();
126  daughters_name = new G4String*[numberOfDaughters];
127  //copy daughters name
128  for (G4int index=0; index < numberOfDaughters; index++) {
129  daughters_name[index] = new G4String(*right.daughters_name[index]);
130  }
131  }
132  }
133  return *this;
134 }
G4int
int G4int
Definition: G4Types.hh:78
G4VDecayChannel::kinematics_name
G4String kinematics_name
Definition: G4VDecayChannel.hh:165
G4VDecayChannel::parent_name
G4String * parent_name
Definition: G4VDecayChannel.hh:171
G4VDecayChannel::daughters_name
G4String ** daughters_name
Definition: G4VDecayChannel.hh:173

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