Glashow resonance event generator. More...

#include <GLRESGenerator.h>

Inheritance diagram for genie::GLRESGenerator:

Public Member Functions
	GLRESGenerator ()

	GLRESGenerator (string config)

	~GLRESGenerator ()

void	ProcessEventRecord (GHepRecord *event) const

void	Configure (const Registry &config)

void	Configure (string config)

Public Member Functions inherited from genie::EventRecordVisitorI
virtual	~EventRecordVisitorI ()

Public Member Functions inherited from genie::Algorithm
virtual	~Algorithm ()

virtual void	FindConfig (void)

virtual const Registry &	GetConfig (void) const

Registry *	GetOwnedConfig (void)

virtual const AlgId &	Id (void) const
	Get algorithm ID. More...

virtual AlgStatus_t	GetStatus (void) const
	Get algorithm status. More...

virtual bool	AllowReconfig (void) const

virtual AlgCmp_t	Compare (const Algorithm *alg) const
	Compare with input algorithm. More...

virtual void	SetId (const AlgId &id)
	Set algorithm ID. More...

virtual void	SetId (string name, string config)

const Algorithm *	SubAlg (const RgKey &registry_key) const

void	AdoptConfig (void)

void	AdoptSubstructure (void)

virtual void	Print (ostream &stream) const
	Print algorithm info. More...

Private Member Functions
void	LoadConfig (void)

Private Attributes
TPythia6 *	fPythia
	PYTHIA6 wrapper class. More...

double	fWmin

Additional Inherited Members
Static Public Member Functions inherited from genie::Algorithm
static string	BuildParamVectKey (const std::string &comm_name, unsigned int i)

static string	BuildParamVectSizeKey (const std::string &comm_name)

Protected Member Functions inherited from genie::EventRecordVisitorI
	EventRecordVisitorI ()

	EventRecordVisitorI (string name)

	EventRecordVisitorI (string name, string config)

Protected Member Functions inherited from genie::Algorithm
	Algorithm ()

	Algorithm (string name)

	Algorithm (string name, string config)

void	Initialize (void)

void	DeleteConfig (void)

void	DeleteSubstructure (void)

Registry *	ExtractLocalConfig (const Registry &in) const

Registry *	ExtractLowerConfig (const Registry &in, const string &alg_key) const
	Split an incoming configuration Registry into a block valid for the sub-algo identified by alg_key. More...

template<class T >
bool	GetParam (const RgKey &name, T &p, bool is_top_call=true) const

template<class T >
bool	GetParamDef (const RgKey &name, T &p, const T &def) const

template<class T >
int	GetParamVect (const std::string &comm_name, std::vector< T > &v, bool is_top_call=true) const
	Handle to load vectors of parameters. More...

int	GetParamVectKeys (const std::string &comm_name, std::vector< RgKey > &k, bool is_top_call=true) const

int	AddTopRegistry (Registry *rp, bool owns=true)
	add registry with top priority, also update ownership More...

int	AddLowRegistry (Registry *rp, bool owns=true)
	add registry with lowest priority, also update ownership More...

int	MergeTopRegistry (const Registry &r)

int	AddTopRegisties (const vector< Registry * > &rs, bool owns=false)
	Add registries with top priority, also udated Ownerships. More...

Protected Attributes inherited from genie::Algorithm
bool	fAllowReconfig

bool	fOwnsSubstruc
	true if it owns its substructure (sub-algs,...) More...

AlgId	fID
	algorithm name and configuration set More...

vector< Registry * >	fConfVect

vector< bool >	fOwnerships
	ownership for every registry in fConfVect More...

AlgStatus_t	fStatus
	algorithm execution status More...

AlgMap *	fOwnedSubAlgMp
	local pool for owned sub-algs (taken out of the factory pool) More...

Detailed Description

Glashow resonance event generator.

Author: Costas Andreopoulos <constantinos.andreopoulos cern.ch> University of Liverpool & STFC Rutherford Appleton Laboratory

Feb 15, 2008

Definition at line 31 of file GLRESGenerator.h.

Constructor & Destructor Documentation

GLRESGenerator::GLRESGenerator ( )

Definition at line 44 of file GLRESGenerator.cxx.

                                :
 EventRecordVisitorI("genie::GLRESGenerator")
 {
 
 }

GLRESGenerator::GLRESGenerator ( string config )

Definition at line 50 of file GLRESGenerator.cxx.

                                             :
 EventRecordVisitorI("genie::GLRESGenerator", config)
 {
 
 }

GLRESGenerator::~GLRESGenerator ( )

Definition at line 56 of file GLRESGenerator.cxx.

 {
 
 }

Member Function Documentation

void GLRESGenerator::Configure ( const Registry & config )

virtual

Configure the algorithm with an external registry The registry is merged with the top level registry if it is owned, Otherwise a copy of it is added with the highest priority

Reimplemented from genie::Algorithm.

Definition at line 290 of file GLRESGenerator.cxx.

 {
   Algorithm::Configure(config);
   this->LoadConfig();
 }

void GLRESGenerator::Configure ( string config )

virtual

Configure the algorithm from the AlgoConfigPool based on param_set string given in input An algorithm contains a vector of registries coming from different xml configuration files, which are loaded according a very precise prioriy This methods will load a number registries in order of priority: 1) "Tunable" parameter set from CommonParametes. This is loaded with the highest prioriry and it is designed to be used for tuning procedure Usage not expected from the user. 2) For every string defined in "CommonParame" the corresponding parameter set will be loaded from CommonParameter.xml 3) parameter set specified by the config string and defined in the xml file of the algorithm 4) if config is not "Default" also the Default parameter set from the same xml file will be loaded Effectively this avoids the repetion of a parameter when it is not changed in the requested configuration

Reimplemented from genie::Algorithm.

Definition at line 296 of file GLRESGenerator.cxx.

 {
   Algorithm::Configure(config);
   this->LoadConfig();
 }

void GLRESGenerator::LoadConfig ( void )

private

Definition at line 302 of file GLRESGenerator.cxx.

 {
 #ifdef __GENIE_PYTHIA6_ENABLED__
   fPythia = TPythia6::Instance();
 
   // sync GENIE/PYTHIA6 seed number
   RandomGen::Instance();
 
   // PYTHIA parameters only valid for HEDIS
   GetParam( "Xsec-Wmin", fWmin ) ;
   fPythia->SetPARP(2,  fWmin); //(D = 10. GeV) lowest c.m. energy for the event as a whole that the program will accept to simulate. (bellow 2GeV pythia crashes)
 
   int warnings;       GetParam( "Warnings",      warnings ) ;
   int errors;         GetParam( "Errors",        errors ) ;
   int qrk_mass;       GetParam( "QuarkMass",     qrk_mass ) ;
   fPythia->SetMSTU(26, warnings);     // (Default=10) maximum number of warnings that are printed
   fPythia->SetMSTU(22, errors);       // (Default=10) maximum number of errors that are printed
   fPythia->SetMSTJ(93, qrk_mass);     // light (d, u, s, c, b) quark masses are taken from PARF(101) - PARF(105) rather than PMAS(1,1) - PMAS(5,1). Diquark masses are given as sum of quark masses, without spin splitting term.
 
 #endif // __GENIE_PYTHIA6_ENABLED__
 
 }

void GLRESGenerator::ProcessEventRecord ( GHepRecord * event ) const

virtual

Implements genie::EventRecordVisitorI.

Definition at line 61 of file GLRESGenerator.cxx.

 {
 
 #ifdef __GENIE_PYTHIA6_ENABLED__
 
   Interaction * interaction = event->Summary();
   const InitialState & init_state = interaction->InitState();
 
   //incoming v & struck particle & remnant nucleus
   GHepParticle * nu     = event -> Probe();
   GHepParticle * el     = event -> HitElectron();
   GHepParticle * target = event -> TargetNucleus();
   assert(nu);
   assert(el);
   assert(target);
 
   if(target) event->AddParticle(target->Pdg(), kIStStableFinalState, 1,-1,-1,-1, *(target->P4()), *(target->X4()) );
 
   LongLorentzVector p4_nu( * event->Probe()->P4()       );
   LongLorentzVector p4_el( * event->HitElectron()->P4() );
   LongLorentzVector p4_Wlong( p4_nu.Px()+p4_el.Px(), p4_nu.Py()+p4_el.Py(), p4_nu.Pz()+p4_el.Pz(), p4_nu.E()+p4_el.E() );
 
   long double Wmass = p4_Wlong.M();
   LOG("GLRESGenerator", pINFO) << "Wmass : " << Wmass;
 
   if(Wmass < fWmin) {
     LOG("GLRESGenerator", pWARN) << "Low invariant mass, W = " << Wmass << " GeV!!";
     event->EventFlags()->SetBitNumber(kHadroSysGenErr, true);
     genie::exceptions::EVGThreadException exception;
     exception.SetReason("Could not simulate the hadronic system");
     exception.SwitchOnFastForward();
     throw exception;
     return;
   }
 
   // Final state primary lepton PDG code
   int pdgl = interaction->FSPrimLeptonPdg();
   assert(pdgl!=0);
 
   LOG("GLRESGenerator", pINFO) << "Channel : " << interaction->FSPrimLeptonPdg();
 
   if ( pdg::IsElectron(pdgl) || pdg::IsMuon(pdgl) || pdg::IsTau(pdgl) ) {
 
     // Get selected kinematics
     long double y = interaction->Kine().y(true);
     assert(y>0 && y<1);
 
     // Compute the neutrino and muon energy
     long double Ev  = init_state.ProbeE(kRfLab);
     long double El  = y*Ev;
 
     LOG("GLRESGenerator", pINFO) << "Ev = " << Ev << ", y = " << y << ", -> El = " << El;
 
     // Compute the momentum transfer and scattering angle
     long double El2   = powl(El,2);
     long double ml    = interaction->FSPrimLepton()->Mass();
     long double ml2   = powl(ml,2);
     long double pl    = sqrtl(El2-ml2);
 
     long double Q2    = 2*(Ev-El)*kElectronMass + kElectronMass*kElectronMass;
     long double costh = (El-0.5*(Q2+ml2)/Ev)/pl;
     long double sinth = sqrtl( 1-powl(costh,2.) );
     // Randomize transverse components
     RandomGen * rnd = RandomGen::Instance();
     long double phi  = 2* constants::kPi * rnd->RndLep().Rndm();
 
     LOG("GLRESGenerator", pINFO) << "Q2 = " << Q2 << ", cos(theta) = " << costh << ", phi = " << phi;
 
     long double plx = pl*sinth*cosl(phi);
     long double ply = pl*sinth*sinl(phi);
     long double plz = pl*costh;
 
     // Lepton 4-momentum in the LAB frame
     LongLorentzVector p4lplong( plx, ply, plz, El );
     p4lplong.Rotate(p4_nu);
     LongLorentzVector p4nulong( p4_Wlong.Px()-p4lplong.Px(), p4_Wlong.Py()-p4lplong.Py(), p4_Wlong.Pz()-p4lplong.Pz(), p4_Wlong.E()-p4lplong.E() );
 
     TLorentzVector p4_W    ( (double)p4_Wlong.Px(), (double)p4_Wlong.Py(), (double)p4_Wlong.Pz(), (double)p4_Wlong.E() );
     TLorentzVector p4_lpout( (double)p4lplong.Px(), (double)p4lplong.Py(), (double)p4lplong.Pz(), (double)p4lplong.E() );
     TLorentzVector p4_nuout( (double)p4nulong.Px(), (double)p4nulong.Py(), (double)p4nulong.Pz(), (double)p4nulong.E() );
 
     int pdgvout = 0;
     if      ( pdg::IsElectron(pdgl) ) pdgvout = kPdgAntiNuE;
     else if ( pdg::IsMuon(pdgl)     ) pdgvout = kPdgAntiNuMu;
     else if ( pdg::IsTau(pdgl)      ) pdgvout = kPdgAntiNuTau;
 
     // Create a GHepParticle and add it to the event record
     event->AddParticle( kPdgWM,  kIStDecayedState,     0, -1,  5,  6, p4_W,     *(nu->X4()) ); //W [mothers: nuebar_in,e_in][daugthers: nulbar_out,lp_out]
     event->AddParticle( pdgvout, kIStStableFinalState, 4, -1, -1, -1, p4_nuout, *(nu->X4()) );
     event->AddParticle( pdgl,    kIStStableFinalState, 4, -1, -1, -1, p4_lpout, *(nu->X4()) );
     event->Summary()->KinePtr()->SetFSLeptonP4(p4_lpout);
 
   }
   else {
 
     char p6frame[10], p6nu[10], p6tgt[10];
     strcpy(p6frame, "CMS"    );
     strcpy(p6nu,    "nu_ebar");
     strcpy(p6tgt,   "e-"     );
 
 
     int mstp61  = fPythia->GetMSTP(61);
     int mstp71  = fPythia->GetMSTP(71);
     int mdme206 = fPythia->GetMDME(206,1);
     int mdme207 = fPythia->GetMDME(207,1);
     int mdme208 = fPythia->GetMDME(208,1);
     double pmas1_W = fPythia->GetPMAS(24,1);
     double pmas2_W = fPythia->GetPMAS(24,2);
     double pmas2_t = fPythia->GetPMAS(6,2);
     fPythia->SetMSTP(61,0);    // (Default=2) master switch for initial-state QCD and QED radiation.
     fPythia->SetMSTP(71,0);    // (Default=2) master switch for initial-state QCD and QED radiation.
     fPythia->SetMDME(206,1,0); //swicht off W decay leptonic modes
     fPythia->SetMDME(207,1,0);
     fPythia->SetMDME(208,1,0);
     fPythia->SetPMAS(24,1,kMw); //mass of the W boson (pythia=80.450 // genie=80.385)
     fPythia->SetPMAS(24,2,0.);  //set to 0 the width of the W boson to avoid problems with energy conservation
     fPythia->SetPMAS(6,2,0.);  //set to 0 the width of the top to avoid problems with energy conservation
 
     fPythia->Pyinit(p6frame, p6nu, p6tgt, (double)Wmass);
 
     fPythia->Pyevnt();
 
     fPythia->SetMSTP(61,mstp61);
     fPythia->SetMSTP(71,mstp71);
     fPythia->SetMDME(206,1,mdme206);
     fPythia->SetMDME(207,1,mdme207);
     fPythia->SetMDME(208,1,mdme208);
     fPythia->SetPMAS(24,1,pmas1_W);
     fPythia->SetPMAS(24,2,pmas2_W);
     fPythia->SetPMAS(6,2,pmas2_t);
 
 
     // Use for debugging purposes
     //fPythia->Pylist(3);
 
     // get LUJETS record
     fPythia->GetPrimaries();
     TClonesArray * pythia_particles = (TClonesArray *) fPythia->ImportParticles("All");
     // copy PYTHIA container to a new TClonesArray so as to transfer ownership
     // of the container and of its elements to the calling method
     int np = pythia_particles->GetEntries();
     assert(np>0);
     TClonesArray * particle_list = new TClonesArray("genie::GHepParticle", np);
     particle_list->SetOwner(true);
 
     // Boost velocity LAB' -> Resonance rest frame
     long double beta = p4_Wlong.P()/p4_Wlong.E();
 
     TMCParticle * p = 0;
     TIter particle_iter(pythia_particles);
     while( (p = (TMCParticle *) particle_iter.Next()) ) {
 
       int pdgc   = p->GetKF();
       int ks     = p->GetKS();
       int parent = p->GetParent();
 
       if ( ks==21 ) { continue; } //we dont want to save first particles from pythia (init states)
 
       LongLorentzVector p4long( p->GetPx(), p->GetPy(), p->GetPz(), p->GetEnergy()  );
       p4long.Boost(beta);
       p4long.Rotate(p4_Wlong);
 
       TLorentzVector p4( (double)p4long.Px(), (double)p4long.Py(), (double)p4long.Pz(), (double)p4long.E() );
 
       double massPDG = PDGLibrary::Instance()->Find(pdgc)->Mass();
       if ( (ks==1 || ks==4) && p4.E() < massPDG ) {
         LOG("GLRESGenerator", pWARN) << "Putting at rest one stable particle generated by PYTHIA because E < m";
         LOG("GLRESGenerator", pWARN) << "PDG = " << pdgc << " // State = " << ks;
         LOG("GLRESGenerator", pWARN) << "E = " << p4.E() << " // |p| = " << TMath::Sqrt(p4.P());
         LOG("GLRESGenerator", pWARN) << "p = [ " << p4.Px() << " , "  << p4.Py() << " , "  << p4.Pz() << " ]";
         LOG("GLRESGenerator", pWARN) << "m    = " << p4.M() << " // mpdg = " << massPDG;
         p4.SetXYZT(0,0,0,massPDG);
       }
 
       // copy final state particles to the event record
       GHepStatus_t ist = (ks==1 || ks==4) ? kIStStableFinalState : kIStDISPreFragmHadronicState;
 
       // fix numbering scheme used for mother/daughter assignments
       int firstmother = -1;
       int lastmother  = -1;
       int firstchild  = -1;
       int lastchild   = -1;
 
       if ( parent < 10 ) {  // I=10 is the position were W boson is stored
         if      ( TMath::Abs(pdgc)<7 ) {   //outgoing quarks: mother will be the boson (saved in position 4)
           firstmother = 4;
           firstchild  = p->GetFirstChild() - 6;  //boson is stored in I=10 with pythia and I=4 for GENIE => shift 6
           lastchild   = p->GetLastChild()  - 6;
         }
         else if ( TMath::Abs(pdgc)==24 ) { //produced W boson: mother will be the incoming neutrino
           firstmother = 0;
           firstchild  = p->GetFirstChild() - 6;
           lastchild   = p->GetLastChild()  - 6;
         }
         else if ( pdgc==22 ) {             //radiative photons: mother will be the incoming electron
           firstmother = 2;
         }
       }
       else { //rest
         firstmother = parent - 6; //shift to match boson position
         firstchild  = (p->GetFirstChild()==0) ? p->GetFirstChild() - 1 : p->GetFirstChild() - 6;
         lastchild   = (p->GetLastChild()==0)  ? p->GetLastChild()  - 1 : p->GetLastChild()  - 6;
       }
 
       double vx = nu->X4()->X() + p->GetVx()*1e12; //pythia gives position in [mm] while genie uses [fm]
       double vy = nu->X4()->Y() + p->GetVy()*1e12;
       double vz = nu->X4()->Z() + p->GetVz()*1e12;
       double vt = nu->X4()->T() + p->GetTime()*(units::millimeter/units::second);
       TLorentzVector pos( vx, vy, vz, vt );
 
       event->AddParticle(pdgc, ist, firstmother, lastmother, firstchild, lastchild, p4, pos );
 
     }
 
   }
 
 #else
   LOG("GLRESGenerator", pFATAL)
     << "Calling GENIE/PYTHIA6 without enabling PYTHIA6";
   gAbortingInErr = true;
   std::exit(1);
 #endif
 
 }

Member Data Documentation

TPythia6* genie::GLRESGenerator::fPythia

mutableprivate

PYTHIA6 wrapper class.

Definition at line 51 of file GLRESGenerator.h.

double genie::GLRESGenerator::fWmin

private

Definition at line 54 of file GLRESGenerator.h.

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

Generator/src/Physics/GlashowResonance/EventGen/GLRESGenerator.h
Generator/src/Physics/GlashowResonance/EventGen/GLRESGenerator.cxx

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation