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Final State Rotation

Final State Rotation . KOI, Tatsumi SLAC. Questions. Does each our model providing phi symmetry or not Can we simply remove random rotation of final state? Some models will give an assymetry ? Does our interface to models provide a possibility for spin dependent interactions?.

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Final State Rotation

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  1. Final State Rotation KOI, Tatsumi SLAC 14th Geant4 Workshop Catana Italy

  2. Questions • Does each our model providing phi symmetry or not • Can we simply remove random rotation of final state? • Some models will give an assymetry? • Does our interface to models provide a possibility for spin dependent interactions? 14th Geant4 Workshop Catana Italy

  3. What we are doing now G4HadronicProcess.cc 163G4VParticleChange *G4HadronicProcess::PostStepDoIt( 164 const G4Track &aTrack, const G4Step &) { ,,, 253 // Initialize the hadronic projectile from the track 254 255 G4HadProjectile thePro(aTrack); thePro only has pz ,,, 362FillTotalResult(result, aTrack); ,,, } G4HadProjectile.hh 36 class G4HadProjectile 37 { 38 public: 39 G4HadProjectile(const G4Track &aT); 40 G4HadProjectile(const G4DynamicParticle &aT); 41 const G4Material * GetMaterial() const; 42 const G4ParticleDefinition * GetDefinition() const; 43 const G4LorentzVector & Get4Momentum() const {return theMom;} 44 G4LorentzRotation & GetTrafoToLab() {return toLabFrame;} 45G4doubleGetKineticEnergy() const; 46G4doubleGetTotalEnergy() const; 47G4doubleGetTotalMomentum() const; 48G4doubleGetGlobalTime() const {return theTime;} G4HadronicProcess.cc 480 void 481G4HadronicProcess::FillTotalResult(G4HadFinalState * aR, const G4Track & aT) { ,,, 489G4double rotation = 2.*pi*G4UniformRand(); ,,, for projectile 610 newP4.rotate(rotation, it); ,,, for secondaries 618theM.rotate(rotation, it); ,,, } 14th Geant4 Workshop Catana Italy

  4. Expected answers to the questions • Does each our model providing phi symmetry or not • No • Can we simply remove random rotation of final state • No • Some models will give an assymetry? • No • Does our interface to models provide a possibility for spin dependent interactions? • No 14th Geant4 Workshop Catana Italy

  5. Possible solution • Add an attribute to the model for deterrent the rotation in a process. • Checking this attribute before the random rotation in the process. • Models can know only global direction. • Makes difficult to create spin dependent interactions 14th Geant4 Workshop Catana Italy

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