NuclearInteractionSimulator Class Reference

#include <NuclearInteractionSimulator.h>

Inheritance diagram for NuclearInteractionSimulator:

Public Member Functions
	NuclearInteractionSimulator (std::vector< double > &pionEnergies, std::vector< int > &pionTypes, std::vector< std::string > &pionNames, std::vector< double > &pionMasses, std::vector< double > &pionPMin, double pionEnergy, std::vector< double > &lengthRatio, std::vector< std::vector< double > > &ratios, std::map< int, int > &idMap, std::string inputFile, unsigned int distAlgo, double distCut)
	Constructor. More...
bool	read (std::string inputFile)
	Read former nuclear interaction (from previous run) More...
void	save ()
	Save current nuclear interaction (for later use) More...
	~NuclearInteractionSimulator ()
	Default Destructor. More...
Public Member Functions inherited from MaterialEffectsSimulator
RHEP_const_iter	beginDaughters () const
	Returns const iterator to the beginning of the daughters list. More...
int	closestDaughterId ()
	The id of the closest charged daughter (filled for nuclear interactions only) More...
double	eMass () const
	Electron mass in GeV/c2. More...
RHEP_const_iter	endDaughters () const
	Returns const iterator to the end of the daughters list. More...
double	excitE () const
	Mean excitation energy (in GeV) More...
	MaterialEffectsSimulator (double A=28.0855, double Z=14.0000, double density=2.329, double radLen=9.360)
unsigned	nDaughters () const
	Returns the number of daughters. More...
XYZVector	orthogonal (const XYZVector &) const
	A vector orthogonal to another one (because it's not in XYZTLorentzVector) More...
double	radLenIncm () const
	One radiation length in cm. More...
double	rho () const
	Density in g/cm3. More...
void	setNormalVector (const GlobalVector &normal)
	Sets the vector normal to the surface traversed. More...
double	theA () const
	A. More...
double	theZ () const
	Z. More...
void	updateState (ParticlePropagator &myTrack, double radlen, RandomEngineAndDistribution const *)
	Compute the material effect (calls the sub class) More...
virtual	~MaterialEffectsSimulator ()

Private Member Functions
void	compute (ParticlePropagator &Particle, RandomEngineAndDistribution const *)
	Generate a nuclear interaction according to the probability that it happens. More...
double	distanceToPrimary (const RawParticle &Particle, const RawParticle &aDaughter) const
	Compute distance between secondary and primary. More...
unsigned	index (int thePid)
	Return a hashed index for a given pid. More...

Private Attributes
bool	currentValuesWereSet
unsigned	ien4
unsigned	myOutputBuffer
std::ofstream	myOutputFile
std::vector< std::vector < TBranch * > >	theBranches
std::vector< std::vector < unsigned > >	theCurrentEntry
std::vector< std::vector < unsigned > >	theCurrentInteraction
unsigned	theDistAlgo
double	theDistCut
std::vector< std::vector < std::string > >	theFileNames
std::vector< std::vector < TFile * > >	theFiles
std::map< int, int >	theIDMap
std::vector< double >	theLengthRatio
std::vector< std::vector < NUEvent * > >	theNUEvents
std::vector< std::vector < unsigned > >	theNumberOfEntries
std::vector< std::vector < unsigned > >	theNumberOfInteractions
std::vector< std::vector < double > >	thePionCM
std::vector< double >	thePionEN
double	thePionEnergy
std::vector< int >	thePionID
std::vector< double >	thePionMA
std::vector< std::string >	thePionNA
std::vector< double >	thePionPMin
std::vector< std::vector < double > >	theRatios
std::vector< std::vector < TTree * > >	theTrees

Additional Inherited Members
Public Types inherited from MaterialEffectsSimulator
typedef std::vector < RawParticle > ::const_iterator	RHEP_const_iter
Protected Attributes inherited from MaterialEffectsSimulator
std::vector< RawParticle >	_theUpdatedState
double	A
double	density
double	radLen
double	radLengths
int	theClosestChargedDaughterId
GlobalVector	theNormalVector
double	Z

Detailed Description

Definition at line 33 of file NuclearInteractionSimulator.h.

Constructor & Destructor Documentation

NuclearInteractionSimulator::NuclearInteractionSimulator	(	std::vector< double > &	pionEnergies,
		std::vector< int > &	pionTypes,
		std::vector< std::string > &	pionNames,
		std::vector< double > &	pionMasses,
		std::vector< double > &	pionPMin,
		double	pionEnergy,
		std::vector< double > &	lengthRatio,
		std::vector< std::vector< double > > &	ratios,
		std::map< int, int > &	idMap,
		std::string	inputFile,
		unsigned int	distAlgo,
		double	distCut
	)

Constructor.

Definition at line 20 of file NuclearInteractionSimulator.cc.

References gather_cfg::cout, currentValuesWereSet, edm::hlt::Exception, lut2db_cfg::filename, contentValuesFiles::fullPath, edm::FileInPath::fullPath(), ien4, myOutputBuffer, myOutputFile, read(), mathSSE::sqrt(), AlCaHLTBitMon_QueryRunRegistry::string, theBranches, theCurrentEntry, theCurrentInteraction, theFileNames, theFiles, theNUEvents, theNumberOfEntries, theNumberOfInteractions, thePionCM, thePionEN, thePionMA, thePionNA, and theTrees.

  :
  MaterialEffectsSimulator(),
  thePionEN(pionEnergies),
  thePionID(pionTypes),
  thePionNA(pionNames),
  thePionMA(pionMasses),
  thePionPMin(pionPMin),
  thePionEnergy(pionEnergy),
  theLengthRatio(lengthRatio),
  theRatios(ratios),
  theIDMap(idMap),
  theDistAlgo(distAlgo),
  theDistCut(distCut),
  currentValuesWereSet(false)
{
  std::string fullPath;

  // Prepare the map of files
  // Loop over the particle names
  std::vector<TFile*> aVFile(thePionEN.size(),static_cast<TFile*>(0));
  std::vector<TTree*> aVTree(thePionEN.size(),static_cast<TTree*>(0));
  std::vector<TBranch*> aVBranch(thePionEN.size(),static_cast<TBranch*>(0));
  std::vector<NUEvent*> aVNUEvents(thePionEN.size(),static_cast<NUEvent*>(0));
  std::vector<unsigned> aVCurrentEntry(thePionEN.size(),static_cast<unsigned>(0));
  std::vector<unsigned> aVCurrentInteraction(thePionEN.size(),static_cast<unsigned>(0));
  std::vector<unsigned> aVNumberOfEntries(thePionEN.size(),static_cast<unsigned>(0));
  std::vector<unsigned> aVNumberOfInteractions(thePionEN.size(),static_cast<unsigned>(0));
  std::vector<std::string> aVFileName(thePionEN.size(),static_cast<std::string>(""));
  std::vector<double> aVPionCM(thePionEN.size(),static_cast<double>(0));
  theFiles.resize(thePionNA.size());
  theTrees.resize(thePionNA.size());
  theBranches.resize(thePionNA.size());
  theNUEvents.resize(thePionNA.size());
  theCurrentEntry.resize(thePionNA.size());
  theCurrentInteraction.resize(thePionNA.size());
  theNumberOfEntries.resize(thePionNA.size());
  theNumberOfInteractions.resize(thePionNA.size());
  theFileNames.resize(thePionNA.size());
  thePionCM.resize(thePionNA.size());
  for ( unsigned iname=0; iname<thePionNA.size(); ++iname ) { 
    theFiles[iname] = aVFile;
    theTrees[iname] = aVTree;
    theBranches[iname] = aVBranch;
    theNUEvents[iname] = aVNUEvents;
    theCurrentEntry[iname] = aVCurrentEntry;
    theCurrentInteraction[iname] = aVCurrentInteraction;
    theNumberOfEntries[iname] = aVNumberOfEntries;
    theNumberOfInteractions[iname] = aVNumberOfInteractions;
    theFileNames[iname] = aVFileName;
    thePionCM[iname] = aVPionCM;
  } 

  // Read the information from a previous run (to keep reproducibility)
  currentValuesWereSet = this->read(inputFile);
  if ( currentValuesWereSet )
    std::cout << "***WARNING*** You are reading nuclear-interaction information from the file "
          << inputFile << " created in an earlier run."
          << std::endl;

  // Open the file for saving the information of the current run
  myOutputFile.open ("NuclearInteractionOutputFile.txt");
  myOutputBuffer = 0;


  // Open the root files
  //  for ( unsigned file=0; file<theFileNames.size(); ++file ) {
  unsigned fileNb = 0;
  for ( unsigned iname=0; iname<thePionNA.size(); ++iname ) {
    for ( unsigned iene=0; iene<thePionEN.size(); ++iene ) {
      //std::cout << "iname/iene " << iname << " " << iene << std::endl; 
      std::ostringstream filename;
      double theEne = thePionEN[iene];
      filename << "NuclearInteractionsVal_" << thePionNA[iname] << "_E"<< theEne << ".root";
      theFileNames[iname][iene] = filename.str();
      //std::cout << "thePid/theEne " << thePionID[iname] << " " << theEne << std::endl; 

      edm::FileInPath myDataFile("FastSimulation/MaterialEffects/data/"+theFileNames[iname][iene]);
      fullPath = myDataFile.fullPath();
      //    theFiles[file] = TFile::Open(theFileNames[file].c_str());
      theFiles[iname][iene] = TFile::Open(fullPath.c_str());
      if ( !theFiles[iname][iene] ) throw cms::Exception("FastSimulation/MaterialEffects") 
    << "File " << theFileNames[iname][iene] << " " << fullPath <<  " not found ";
      ++fileNb;
      //
      theTrees[iname][iene] = (TTree*) theFiles[iname][iene]->Get("NuclearInteractions"); 
      if ( !theTrees[iname][iene] ) throw cms::Exception("FastSimulation/MaterialEffects") 
    << "Tree with name NuclearInteractions not found in " << theFileNames[iname][iene];
      //
      theBranches[iname][iene] = theTrees[iname][iene]->GetBranch("nuEvent");
      //std::cout << "The branch = " << theBranches[iname][iene] << std::endl;
      if ( !theBranches[iname][iene] ) throw cms::Exception("FastSimulation/MaterialEffects") 
    << "Branch with name nuEvent not found in " << theFileNames[iname][iene];
      //
      theNUEvents[iname][iene] = new NUEvent();
      //std::cout << "The branch = " << theBranches[iname][iene] << std::endl;
      theBranches[iname][iene]->SetAddress(&theNUEvents[iname][iene]);
      //
      theNumberOfEntries[iname][iene] = theTrees[iname][iene]->GetEntries();

      if(currentValuesWereSet) {
        theTrees[iname][iene]->GetEntry(theCurrentEntry[iname][iene]);
        unsigned NInteractions = theNUEvents[iname][iene]->nInteractions();
        theNumberOfInteractions[iname][iene] = NInteractions;
      }

      //
      // Compute the corresponding cm energies of the nuclear interactions
      XYZTLorentzVector Proton(0.,0.,0.,0.986);
      XYZTLorentzVector 
    Reference(0.,
          0.,
          std::sqrt(thePionEN[iene]*thePionEN[iene]
                -thePionMA[iname]*thePionMA[iname]),
          thePionEN[iene]);
      thePionCM[iname][iene] = (Reference+Proton).M();

    }

  }

  // Find the index for which EN = 4. (or thereabout)
  ien4 = 0;
  while ( thePionEN[ien4] < 4.0 ) ++ien4;

  gROOT->cd();

  // Information (Should be on LogInfo)
//  std::cout << " ---> A total of " << fileNb 
//      << " nuclear-interaction files was sucessfully open" << std::endl;

  //  dbe = edm::Service<DaqMonitorBEInterface>().operator->();
  //  htot = dbe->book1D("Total", "All particles",150,0.,150.);
  //  helas = dbe->book1D("Elastic", "Elastic interactions",150,0.,150.);
  //  hinel = dbe->book1D("Inelastic", "Inelastic interactions",150,0.,150.);
  //  hscatter = dbe->book1D("Scattering","Elastic Scattering angle",200,0.,2.); 
  //  hscatter2 = dbe->book2D("Scattering2","Elastic Scattering angle vs p",100,0.,10.,200,0.,2.); 
  //  hAfter = dbe->book1D("eAfter","Energy after collision",200,0.,4.); 
  //  hAfter2 = dbe->book2D("eAfter2","Energy after collision",100,-2.5,2.5,100,0.,4); 
  //  hAfter3 = dbe->book2D("eAfter3","Energy after collision",100,0.,1000.,100,0.,4); 

}

NuclearInteractionSimulator::~NuclearInteractionSimulator

(

)

Default Destructor.

Definition at line 175 of file NuclearInteractionSimulator.cc.

References compare_using_db::ifile, myOutputFile, and theFiles.

                                                          {

  // Close all local files
  // Among other things, this allows the TROOT destructor to end up 
  // without crashing, while trying to close these files from outside
  for ( unsigned ifile=0; ifile<theFiles.size(); ++ifile ) { 
    for ( unsigned iene=0; iene<theFiles[ifile].size(); ++iene ) {
      // std::cout << "Closing file " << iene << " with name " << theFileNames[ifile][iene] << std::endl;
      theFiles[ifile][iene]->Close(); 
    }
  }

  // Close the output file
  myOutputFile.close();

  //  dbe->save("test.root");

}

Member Function Documentation

void NuclearInteractionSimulator::compute ( ParticlePropagator &  Particle, RandomEngineAndDistribution const *  random  )

privatevirtual

Generate a nuclear interaction according to the probability that it happens.

Implements MaterialEffectsSimulator.

Definition at line 194 of file NuclearInteractionSimulator.cc.

References MaterialEffectsSimulator::_theUpdatedState, funct::abs(), RawParticle::boost(), currentValuesWereSet, distanceToPrimary(), relval_parameters_module::energy, create_public_lumi_plots::exp, NUEvent::NUInteraction::first, RandomEngineAndDistribution::flatShoot(), NUEvent::NUParticle::id, ien4, index(), NUEvent::NUInteraction::last, fff_deleter::log, NUEvent::NUParticle::mass, RawParticle::mass(), MaterialEffectsSimulator::orthogonal(), phi, RawParticle::pid(), funct::pow(), NUEvent::NUParticle::px, NUEvent::NUParticle::py, NUEvent::NUParticle::pz, MaterialEffectsSimulator::radLengths, RawParticle::rotate(), RawParticle::setID(), funct::sin(), slope, mathSSE::sqrt(), MaterialEffectsSimulator::theA(), MaterialEffectsSimulator::theClosestChargedDaughterId, theCurrentEntry, theCurrentInteraction, theDistCut, theIDMap, theLengthRatio, theNUEvents, theNumberOfEntries, theNumberOfInteractions, thePionCM, thePionEN, thePionEnergy, thePionNA, thePionPMin, theRatios, theta(), and theTrees.

{
  if(!currentValuesWereSet) {
    currentValuesWereSet = true;
    for ( unsigned iname=0; iname<thePionNA.size(); ++iname ) {
      for ( unsigned iene=0; iene<thePionEN.size(); ++iene ) {
        theCurrentEntry[iname][iene] = (unsigned) (theNumberOfEntries[iname][iene] * random->flatShoot());

        theTrees[iname][iene]->GetEntry(theCurrentEntry[iname][iene]);
        unsigned NInteractions = theNUEvents[iname][iene]->nInteractions();
        theNumberOfInteractions[iname][iene] = NInteractions;

        theCurrentInteraction[iname][iene] = (unsigned) (theNumberOfInteractions[iname][iene] * random->flatShoot());
      }
    }
  }

  // Read a Nuclear Interaction in a random manner

  double pHadron = std::sqrt(Particle.Vect().Mag2()); 
  //  htot->Fill(pHadron);

  // The hadron has enough momentum to create some relevant final state
  if ( pHadron > thePionEnergy ) { 

    // The particle type
    std::map<int,int>::const_iterator thePit = theIDMap.find(Particle.pid());
    
    int thePid = thePit != theIDMap.end() ? thePit->second : Particle.pid(); 

    // Is this particle type foreseen?
    unsigned fPid = abs(thePid);
    if ( fPid != 211 && fPid != 130 && fPid != 321 && fPid != 2112 && fPid != 2212 ) { 
      return;
      //std::cout << "Unknown particle type = " << thePid << std::endl;
      //thePid = 211;
    }

    // The inelastic interaction length at p(pion) = 5 GeV/c
    unsigned thePidIndex = index(thePid);
    double theInelasticLength = radLengths * theLengthRatio[thePidIndex];

    // The elastic interaction length
    // The baroque parameterization is a fit to Fig. 40.13 of the PDG
    double ee = pHadron > 0.6 ? 
      exp(-std::sqrt((pHadron-0.6)/1.122)) : exp(std::sqrt((0.6-pHadron)/1.122));
    double theElasticLength = ( 0.8753 * ee + 0.15 )
    //    double theElasticLength = ( 0.15 + 0.195 / log(pHadron/0.4) )
    //    double theElasticLength = ( 0.15 + 0.305 / log(pHadron/0.35) )
                            * theInelasticLength;

    // The total interaction length
    double theTotalInteractionLength = theInelasticLength + theElasticLength;

    // Probability to interact is dl/L0 (maximum for 4 GeV pion)
    double aNuclInteraction = -std::log(random->flatShoot());
    if ( aNuclInteraction < theTotalInteractionLength ) { 

      // The elastic part
      double elastic = random->flatShoot();
      if ( elastic < theElasticLength/theTotalInteractionLength ) {

    //          helas->Fill(pHadron);
    
    // Characteristic scattering angle for the elastic part
    double theta0 = std::sqrt(3.)/ std::pow(theA(),1./3.) * Particle.mass()/pHadron; 
    
    // Draw an angle with theta/theta0*exp[(-theta/2theta0)**2] shape 
    double theta = theta0 * std::sqrt(-2.*std::log(random->flatShoot()));
    double phi = 2. * 3.14159265358979323 * random->flatShoot();
    
    // Rotate the particle accordingly
    RawParticle::Rotation rotation1(orthogonal(Particle.Vect()),theta);
    RawParticle::Rotation rotation2(Particle.Vect(),phi);
    Particle.rotate(rotation1);
    Particle.rotate(rotation2);
    
    // Distance 
    double distance = std::sin(theta);

    // Create a daughter if the kink is large engough 
    if ( distance > theDistCut ) { 
      _theUpdatedState.resize(1);
      _theUpdatedState[0].SetXYZT(Particle.Px(), Particle.Py(),
                      Particle.Pz(), Particle.E());
      _theUpdatedState[0].setID(Particle.pid());
    }

    //  hscatter->Fill(myTheta);
    //  hscatter2->Fill(pHadron,myTheta);
    
      } 

      // The inelastic part
      else {
    
    // Avoid multiple map access
    const std::vector<double>& aPionCM = thePionCM[thePidIndex];
    const std::vector<double>& aRatios = theRatios[thePidIndex];
    // Find the file with the closest c.m energy
    // The target nucleon
    XYZTLorentzVector Proton(0.,0.,0.,0.939);
    // The current particle
    const XYZTLorentzVector& Hadron = (const XYZTLorentzVector&)Particle;
    // The smallest momentum for inelastic interactions
    double pMin = thePionPMin[thePidIndex]; 
    // The correspong smallest four vector
    XYZTLorentzVector Hadron0(0.,0.,pMin,std::sqrt(pMin*pMin+Particle.M2()));

    // The current centre-of-mass energy
    double ecm = (Proton+Hadron).M();
    //std::cout << "Proton = " << Proton << std::endl;
    //std::cout << "Hadron = " << Hadron << std::endl;
    //std::cout << "ecm = " << ecm << std::endl;
    // Get the files of interest (closest c.m. energies)
    unsigned ene1=0;
    unsigned ene2=0;
    // The smallest centre-of-mass energy
    //  double ecm1=1.63; 
    double ecm1= (Proton+Hadron0).M();
    //std::cout << "ecm1 = " << ecm1 << std::endl;
        //std::cout << "ecm[0] = " << aPionCM[0] << std::endl;
    //std::cout << "ecm[11] = " << aPionCM [ aPionCM.size()-1 ] << std::endl;
    double ecm2=aPionCM[0]; 
    double ratio1=0.;
    double ratio2=aRatios[0];
    if ( ecm > aPionCM[0] && ecm < aPionCM [ aPionCM.size()-1 ] ) {
      for ( unsigned ene=1; 
        ene < aPionCM.size() && ecm > aPionCM[ene-1]; 
        ++ene ) {
        if ( ecm<aPionCM[ene] ) { 
          ene2 = ene;
          ene1 = ene2-1;
          ecm1 = aPionCM[ene1];
          ecm2 = aPionCM[ene2];
          ratio1 = aRatios[ene1];
          ratio2 = aRatios[ene2];
        } 
      }
    } else if ( ecm > aPionCM[ aPionCM.size()-1 ] ) { 
      ene1 = aPionCM.size()-1;
      ene2 = aPionCM.size()-2;
      ecm1 = aPionCM[ene1];
      ecm2 = aPionCM[ene2];
      ratio1 = aRatios[ene2];
      ratio2 = aRatios[ene2];
    } 

    
    // The inelastic part of the cross section depends cm energy
    double slope = (std::log10(ecm )-std::log10(ecm1)) 
                 / (std::log10(ecm2)-std::log10(ecm1));
    double inelastic = ratio1 + (ratio2-ratio1) * slope;
    double inelastic4 =  pHadron < 4. ? aRatios[ien4] : 1.;  

    //std::cout << "Inelastic = " << ratio1 << " " << ratio2 << " " << inelastic << std::endl;
    //      std::cout << "Energy/Inelastic : " 
    //      << Hadron.e() << " " << inelastic << std::endl;
    
    // Simulate an inelastic interaction
    if ( elastic > 1.- (inelastic*theInelasticLength)
                       /theTotalInteractionLength ) { 

      // Avoid mutliple map access
      std::vector<unsigned>& aCurrentInteraction = theCurrentInteraction[thePidIndex];
      std::vector<unsigned>& aNumberOfInteractions = theNumberOfInteractions[thePidIndex];
      std::vector<NUEvent*>& aNUEvents = theNUEvents[thePidIndex];
      //      hinel->Fill(pHadron);
      //      std::cout << "INELASTIC INTERACTION ! " 
      //            << pHadron << " " << theInelasticLength << " "
      //            << inelastic * theInelasticLength << std::endl;
      // Choice of the file to read according the the log10(ecm) distance
      // and protection against low momentum proton and neutron that never interacts 
      // (i.e., empty files)
      unsigned ene;
      if ( random->flatShoot() < slope || aNumberOfInteractions[ene1] == 0 )  
        ene = ene2;
      else
        ene = ene1;

      //std::cout << "Ecm1/2 = " << ecm1 << " " << ecm2 << std::endl;
      //std::cout << "Ratio1/2 = " << ratio1 << " " << ratio2 << std::endl;
      //std::cout << "Ene = " << ene << " slope = " << slope << std::endl;

      //std::cout << "Pion energy = " << Hadron.E() 
      //        << "File chosen " << theFileNames[thePidIndex][ene]
      //        << std::endl;
      
      // The boost characteristics
      XYZTLorentzVector theBoost = Proton + Hadron;
      theBoost /= theBoost.e();
      
      // std::cout << "File chosen : " << thePid << "/" << ene 
      //        << " Current interaction = " << aCurrentInteraction[ene] 
      //        << " Total interactions = " << aNumberOfInteractions[ene]
      //        << std::endl;
      //      theFiles[thePidIndex][ene]->cd();
      //      gDirectory->ls();

      // Check we are not either at the end of an interaction bunch 
      // or at the end of a file
      if ( aCurrentInteraction[ene] == aNumberOfInteractions[ene] ) {
        // std::cout << "End of interaction bunch ! ";
        std::vector<unsigned>& aCurrentEntry = theCurrentEntry[thePidIndex];
        std::vector<unsigned>& aNumberOfEntries = theNumberOfEntries[thePidIndex];
        std::vector<TTree*>& aTrees = theTrees[thePidIndex];
        ++aCurrentEntry[ene];
        // std::cerr << "Read the next entry " 
        //           << aCurrentEntry[ene] << std::endl;
        aCurrentInteraction[ene] = 0;
        if ( aCurrentEntry[ene] == aNumberOfEntries[ene] ) { 
          aCurrentEntry[ene] = 0;
          //  std::cout << "End of file - Rewind! " << std::endl;
        }
        unsigned myEntry = aCurrentEntry[ene];
        // std::cout << "The new entry " << myEntry 
        //           << " is read ... in TTree " << aTrees[ene] << " "; 
        aTrees[ene]->GetEntry(myEntry);
        // std::cout << "The number of interactions in the new entry is ... "; 
        aNumberOfInteractions[ene] = aNUEvents[ene]->nInteractions();
        // std::cout << aNumberOfInteractions[ene] << std::endl;
      }
      
      // Read the interaction
      NUEvent::NUInteraction anInteraction 
        = aNUEvents[ene]->theNUInteractions()[aCurrentInteraction[ene]];
      
      unsigned firstTrack = anInteraction.first; 
      unsigned lastTrack = anInteraction.last;
      //      std::cout << "First and last tracks are " << firstTrack << " " << lastTrack << std::endl;
      
      _theUpdatedState.resize(lastTrack-firstTrack+1);

      double distMin = 1E99;

      // Some rotation around the boost axis, for more randomness
      XYZVector theAxis = theBoost.Vect().Unit();
      double theAngle = random->flatShoot() * 2. * 3.14159265358979323;
      RawParticle::Rotation axisRotation(theAxis,theAngle);
      RawParticle::Boost axisBoost(theBoost.x(),theBoost.y(),theBoost.z());

      // A rotation to bring the particles back to the pion direction
      XYZVector zAxis(0.,0.,1.); 
      XYZVector orthAxis = (zAxis.Cross(theBoost.Vect())).Unit(); 
      double orthAngle = acos(theBoost.Vect().Unit().Z());
      RawParticle::Rotation orthRotation(orthAxis,orthAngle);

      // A few checks
      // double eAfter = 0.;
      
      // Loop on the nuclear interaction products
      for ( unsigned iTrack=firstTrack; iTrack<=lastTrack; ++iTrack ) {
        
        unsigned idaugh = iTrack - firstTrack;
        NUEvent::NUParticle aParticle = aNUEvents[ene]->theNUParticles()[iTrack];
        //  std::cout << "Track " << iTrack 
        //        << " id/px/py/pz/mass "
        //        << aParticle.id << " " 
        //        << aParticle.px << " " 
        //        << aParticle.py << " " 
        //        << aParticle.pz << " " 
        //        << aParticle.mass << " " << endl; 
        
        // Add a RawParticle with the proper energy in the c.m frame of 
        // the nuclear interaction
        double energy = std::sqrt( aParticle.px*aParticle.px
                     + aParticle.py*aParticle.py
                     + aParticle.pz*aParticle.pz
                     + aParticle.mass*aParticle.mass/(ecm*ecm) );

        RawParticle& aDaughter = _theUpdatedState[idaugh]; 
        aDaughter.SetXYZT(aParticle.px*ecm,aParticle.py*ecm,
                  aParticle.pz*ecm,energy*ecm);     
        aDaughter.setID(aParticle.id);

        // Rotate to the collision axis
        aDaughter.rotate(orthRotation);

        // Rotate around the boost axis for more randomness
        aDaughter.rotate(axisRotation);
        
        // Boost it in the lab frame
        aDaughter.boost(axisBoost);

        // Store the closest daughter index (for later tracking purposes, so charged particles only) 
        double distance = distanceToPrimary(Particle,aDaughter);
        // Find the closest daughter, if closer than a given upper limit.
        if ( distance < distMin && distance < theDistCut ) {
          distMin = distance;
          theClosestChargedDaughterId = idaugh;
        }

        // eAfter += aDaughter.E();

      }

      /*
      double eBefore = Particle.E();
      double rapid = Particle.momentum().Eta();
      if ( eBefore > 0. ) { 
        hAfter->Fill(eAfter/eBefore);
        hAfter2->Fill(rapid,eAfter/eBefore);
        hAfter3->Fill(eBefore,eAfter/eBefore);
      }
      */

         // ERROR The way this loops through the events breaks
         // replay. Which events are retrieved depends on
         // which previous events were processed.

      // Increment for next time
      ++aCurrentInteraction[ene];
      
    // Simulate a stopping hadron (low momentum)
    } else if ( pHadron < 4. &&  
            elastic > 1.- (inelastic4*theInelasticLength)
                          /theTotalInteractionLength ) { 
      // A fake particle with 0 momentum as a daughter!
      _theUpdatedState.resize(1);
      _theUpdatedState[0].SetXYZT(0.,0.,0.,0.);
      _theUpdatedState[0].setID(22);
    }

      }

    }

  }

}

double NuclearInteractionSimulator::distanceToPrimary ( const RawParticle &  Particle, const RawParticle &  aDaughter  ) const

private

Compute distance between secondary and primary.

Definition at line 526 of file NuclearInteractionSimulator.cc.

References RawParticle::charge(), and theDistAlgo.

Referenced by compute().

                                                               {

  double distance = 2E99;

  // Compute the distance only for charged primaries
  if ( fabs(Particle.charge()) > 1E-12 ) { 

    // The secondary must have the same charge
    double chargeDiff = fabs(aDaughter.charge()-Particle.charge());
    if ( fabs(chargeDiff) < 1E-12 ) {

      // Here are two distance definitions * to be tuned *
      switch ( theDistAlgo ) { 
    
      case 1:
    // sin(theta12)
    distance = (aDaughter.Vect().Unit().Cross(Particle.Vect().Unit())).R();
    break;
    
      case 2: 
    // sin(theta12) * p1/p2
    distance = (aDaughter.Vect().Cross(Particle.Vect())).R()
      /aDaughter.Vect().Mag2();
    break;
    
      default:
    // Should not happen
    distance = 2E99;
    break;
    
      }

    }

  }
      
  return distance;

}

unsigned NuclearInteractionSimulator::index ( int  thePid )

private

Return a hashed index for a given pid.

Definition at line 685 of file NuclearInteractionSimulator.cc.

References thePionID.

Referenced by BeautifulSoup.PageElement::_invert(), and compute().

                                             { 
  
  unsigned myIndex=0;
  while ( thePid != thePionID[myIndex] ) ++myIndex; 
  //  std::cout << "pid/index = " << thePid << " " << myIndex << std::endl;
  return myIndex;

}

bool NuclearInteractionSimulator::read

(

std::string

inputFile

)

Read former nuclear interaction (from previous run)

Definition at line 621 of file NuclearInteractionSimulator.cc.

References python.entryComment::results, findQualityFiles::size, theCurrentEntry, and theCurrentInteraction.

Referenced by Vispa.Plugins.EdmBrowser.EdmDataAccessor.EdmDataAccessor::goto(), NuclearInteractionSimulator(), and Vispa.Plugins.EdmBrowser.EdmDataAccessor.EdmDataAccessor::setFilterBranches().

                                                     {

  std::ifstream myInputFile;
  struct stat results;
  //
  unsigned size1 = 
    theCurrentEntry.size()*
    theCurrentEntry.begin()->size();
  std::vector<unsigned> theCurrentEntries;
  theCurrentEntries.resize(size1);
  size1*=sizeof(unsigned);
  //
  unsigned size2 = 
    theCurrentInteraction.size()*
    theCurrentInteraction.begin()->size();
  std::vector<unsigned> theCurrentInteractions;
  theCurrentInteractions.resize(size2);
  size2 *= sizeof(unsigned);
  //
  unsigned size = 0;


  // Open the file (if any)
  myInputFile.open (inputFile.c_str());
  if ( myInputFile.is_open() ) { 

    // Get the size of the file
    if ( stat(inputFile.c_str(), &results) == 0 ) size = results.st_size;
    else return false; // Something is wrong with that file !

    // Position the pointer just before the last record
    myInputFile.seekg(size-size1-size2);
    myInputFile.read((char*)(&theCurrentEntries.front()),size1);
    myInputFile.read((char*)(&theCurrentInteractions.front()),size2);
    myInputFile.close();

    // Read the current entries
    std::vector< std::vector<unsigned> >::iterator aCurrentEntry = theCurrentEntry.begin();
    std::vector< std::vector<unsigned> >::iterator lastCurrentEntry = theCurrentEntry.end();
    unsigned allEntries=0;
    for ( ; aCurrentEntry!=lastCurrentEntry; ++aCurrentEntry ) { 
      unsigned size = aCurrentEntry->size();
      for ( unsigned iene=0; iene<size; ++iene )
    (*aCurrentEntry)[iene] = theCurrentEntries[allEntries++]; 
    }

    // Read the current interactions
    std::vector< std::vector<unsigned> >::iterator aCurrentInteraction = theCurrentInteraction.begin();
    std::vector< std::vector<unsigned> >::iterator lastCurrentInteraction = theCurrentInteraction.end();
    unsigned allInteractions=0;
    for ( ; aCurrentInteraction!=lastCurrentInteraction; ++aCurrentInteraction ) { 
      unsigned size = aCurrentInteraction->size();
      for ( unsigned iene=0; iene<size; ++iene )
    (*aCurrentInteraction)[iene] =  theCurrentInteractions[allInteractions++];
    }
    
    return true;
  }
 
  return false;

}

void NuclearInteractionSimulator::save

(

)

Save current nuclear interaction (for later use)

Definition at line 568 of file NuclearInteractionSimulator.cc.

References myOutputBuffer, myOutputFile, findQualityFiles::size, theCurrentEntry, and theCurrentInteraction.

Referenced by Vispa.Main.TabController.TabController::allowClose(), Vispa.Main.TabController.TabController::checkModificationTimestamp(), and MaterialEffects::save().

                                  {

  // Size of buffer
  ++myOutputBuffer;

  // Periodically close the current file and open a new one
  if ( myOutputBuffer/1000*1000 == myOutputBuffer ) { 
    myOutputFile.close();
    myOutputFile.open ("NuclearInteractionOutputFile.txt");
    //    myOutputFile.seekp(0); // No need to rewind in that case
  }
  //
  unsigned size1 = 
    theCurrentEntry.size()*
    theCurrentEntry.begin()->size();
  std::vector<unsigned> theCurrentEntries;
  theCurrentEntries.resize(size1);
  size1*=sizeof(unsigned);
  //
  unsigned size2 = 
    theCurrentInteraction.size()*
    theCurrentInteraction.begin()->size();
  std::vector<unsigned> theCurrentInteractions;
  theCurrentInteractions.resize(size2);
  size2 *= sizeof(unsigned);

  // Save the current entries 
  std::vector< std::vector<unsigned> >::const_iterator aCurrentEntry = theCurrentEntry.begin();
  std::vector< std::vector<unsigned> >::const_iterator lastCurrentEntry = theCurrentEntry.end();
  unsigned allEntries=0;
  for ( ; aCurrentEntry!=lastCurrentEntry; ++aCurrentEntry ) { 
    unsigned size = aCurrentEntry->size();
    for ( unsigned iene=0; iene<size; ++iene )
      theCurrentEntries[allEntries++] = (*aCurrentEntry)[iene]; 
  }
  
  // Save the current interactions
  std::vector< std::vector<unsigned> >::const_iterator aCurrentInteraction = theCurrentInteraction.begin();
  std::vector< std::vector<unsigned> >::const_iterator lastCurrentInteraction = theCurrentInteraction.end();
  unsigned allInteractions=0;
  for ( ; aCurrentInteraction!=lastCurrentInteraction; ++aCurrentInteraction ) { 
    unsigned size = aCurrentInteraction->size();
    for ( unsigned iene=0; iene<size; ++iene )
      theCurrentInteractions[allInteractions++] = (*aCurrentInteraction)[iene]; 
  }
  // 
  myOutputFile.write((const char*)(&theCurrentEntries.front()), size1);
  myOutputFile.write((const char*)(&theCurrentInteractions.front()), size2);  
  myOutputFile.flush();

}

Member Data Documentation

bool NuclearInteractionSimulator::currentValuesWereSet

private

Definition at line 100 of file NuclearInteractionSimulator.h.

Referenced by compute(), and NuclearInteractionSimulator().

unsigned NuclearInteractionSimulator::ien4

private

Definition at line 93 of file NuclearInteractionSimulator.h.

Referenced by compute(), and NuclearInteractionSimulator().

unsigned NuclearInteractionSimulator::myOutputBuffer

private

Definition at line 98 of file NuclearInteractionSimulator.h.

Referenced by NuclearInteractionSimulator(), and save().

std::ofstream NuclearInteractionSimulator::myOutputFile

private

Definition at line 97 of file NuclearInteractionSimulator.h.

Referenced by NuclearInteractionSimulator(), save(), and ~NuclearInteractionSimulator().

std::vector< std::vector<TBranch*> > NuclearInteractionSimulator::theBranches

private

Definition at line 83 of file NuclearInteractionSimulator.h.

Referenced by NuclearInteractionSimulator().

std::vector< std::vector<unsigned> > NuclearInteractionSimulator::theCurrentEntry

private

Definition at line 85 of file NuclearInteractionSimulator.h.

Referenced by compute(), NuclearInteractionSimulator(), read(), and save().

std::vector< std::vector<unsigned> > NuclearInteractionSimulator::theCurrentInteraction

private

Definition at line 86 of file NuclearInteractionSimulator.h.

Referenced by compute(), NuclearInteractionSimulator(), read(), and save().

unsigned NuclearInteractionSimulator::theDistAlgo

private

Definition at line 94 of file NuclearInteractionSimulator.h.

Referenced by distanceToPrimary().

double NuclearInteractionSimulator::theDistCut

private

Definition at line 95 of file NuclearInteractionSimulator.h.

Referenced by compute().

std::vector< std::vector<std::string> > NuclearInteractionSimulator::theFileNames

private

Definition at line 89 of file NuclearInteractionSimulator.h.

Referenced by NuclearInteractionSimulator().

std::vector< std::vector<TFile*> > NuclearInteractionSimulator::theFiles

private

Definition at line 81 of file NuclearInteractionSimulator.h.

Referenced by NuclearInteractionSimulator(), and ~NuclearInteractionSimulator().

std::map< int, int > NuclearInteractionSimulator::theIDMap

private

Definition at line 92 of file NuclearInteractionSimulator.h.

Referenced by compute().

std::vector<double> NuclearInteractionSimulator::theLengthRatio

private

Definition at line 78 of file NuclearInteractionSimulator.h.

Referenced by compute().

std::vector< std::vector<NUEvent*> > NuclearInteractionSimulator::theNUEvents

private

Definition at line 84 of file NuclearInteractionSimulator.h.

Referenced by compute(), and NuclearInteractionSimulator().

std::vector< std::vector<unsigned> > NuclearInteractionSimulator::theNumberOfEntries

private

Definition at line 87 of file NuclearInteractionSimulator.h.

Referenced by compute(), and NuclearInteractionSimulator().

std::vector< std::vector<unsigned> > NuclearInteractionSimulator::theNumberOfInteractions

private

Definition at line 88 of file NuclearInteractionSimulator.h.

Referenced by compute(), and NuclearInteractionSimulator().

std::vector< std::vector<double> > NuclearInteractionSimulator::thePionCM

private

Definition at line 90 of file NuclearInteractionSimulator.h.

Referenced by compute(), and NuclearInteractionSimulator().

std::vector<double> NuclearInteractionSimulator::thePionEN

private

Definition at line 72 of file NuclearInteractionSimulator.h.

Referenced by compute(), and NuclearInteractionSimulator().

double NuclearInteractionSimulator::thePionEnergy

private

Definition at line 77 of file NuclearInteractionSimulator.h.

Referenced by compute().

std::vector<int> NuclearInteractionSimulator::thePionID

private

Definition at line 73 of file NuclearInteractionSimulator.h.

Referenced by index().

std::vector<double> NuclearInteractionSimulator::thePionMA

private

Definition at line 75 of file NuclearInteractionSimulator.h.

Referenced by NuclearInteractionSimulator().

std::vector<std::string> NuclearInteractionSimulator::thePionNA

private

Definition at line 74 of file NuclearInteractionSimulator.h.

Referenced by compute(), and NuclearInteractionSimulator().

std::vector<double> NuclearInteractionSimulator::thePionPMin

private

Definition at line 76 of file NuclearInteractionSimulator.h.

Referenced by compute().

std::vector< std::vector<double> > NuclearInteractionSimulator::theRatios

private

Definition at line 79 of file NuclearInteractionSimulator.h.

Referenced by compute().

std::vector< std::vector<TTree*> > NuclearInteractionSimulator::theTrees

private

Definition at line 82 of file NuclearInteractionSimulator.h.

Referenced by compute(), and NuclearInteractionSimulator().