#include <ParticleReplacerParticleGun.h>

Inheritance diagram for ParticleReplacerParticleGun:

Public Member Functions
virtual void	beginJob ()

virtual void	endJob ()

	ParticleReplacerParticleGun (const edm::ParameterSet &)

std::auto_ptr< HepMC::GenEvent >	produce (const std::vector< reco::Particle > &, const reco::Vertex =0, const HepMC::GenEvent =0, MCParticleReplacer *=0)

virtual	~ParticleReplacerParticleGun ()

Public Member Functions inherited from ParticleReplacerBase
virtual void	beginRun (edm::Run &run, const edm::EventSetup &es)

virtual void	declareExtraProducts (MCParticleReplacer *)

virtual void	endRun ()

	ParticleReplacerBase (const edm::ParameterSet &)

virtual	~ParticleReplacerBase ()

Private Member Functions
void	correctTauMass (const std::vector< reco::Particle > &, std::vector< HepMC::FourVector > &)

void	forceTauolaTauDecays ()

float	randomPolarization ()

float	tauHelicity (int)

void	tauola_forParticleGun (int, int, const HepMC::FourVector &)

Private Attributes
std::string	forceTauDecay_

int	forceTauMinusHelicity_

int	forceTauPlusHelicity_

std::string	forceTauPolarization_

std::string	generatorMode_

int	gunParticle_

std::string	particleOrigin_

float	pol1_ [4]

float	pol2_ [4]

gen::Pythia6Service	pythia_

gen::TauolaInterfaceBase *	tauola_

Additional Inherited Members
Public Attributes inherited from ParticleReplacerBase
unsigned int	passed_

unsigned int	tried_

Protected Attributes inherited from ParticleReplacerBase
const double	tauMass_

int	verbosity_

Detailed Description

Particle gun replacer algorithm

Author: Sami Lehti

Version

Revision:: 1.2

Id:: ParticleReplacerParticleGun.h,v 1.2 2013/01/31 09:07:18 veelken Exp

Definition at line 25 of file ParticleReplacerParticleGun.h.

Constructor & Destructor Documentation

ParticleReplacerParticleGun::ParticleReplacerParticleGun ( const edm::ParameterSet & iConfig )

explicit

Definition at line 14 of file ParticleReplacerParticleGun.cc.

References Exception, forceTauDecay_, forceTauMinusHelicity_, forceTauPlusHelicity_, forceTauPolarization_, generatorMode_, reco::get(), edm::ParameterSet::getParameter(), NULL, pol1_, pol2_, tauola_, and cond::rpcobgas::time.

   : ParticleReplacerBase(iConfig),
     pythia_(iConfig),
     particleOrigin_(iConfig.getParameter<std::string>("particleOrigin")),
     forceTauPolarization_(iConfig.getParameter<std::string>("forceTauPolarization")),
     forceTauDecay_(iConfig.getParameter<std::string>("forceTauDecay")),
     generatorMode_(iConfig.getParameter<std::string>("generatorMode")),
     gunParticle_(iConfig.getParameter<int>("gunParticle")),
     forceTauPlusHelicity_(iConfig.getParameter<int>("forceTauPlusHelicity")),
     forceTauMinusHelicity_(iConfig.getParameter<int>("forceTauMinusHelicity"))
 {
   tauola_ = (gen::TauolaInterfaceBase*)(TauolaFactory::get()->create("Tauolapp113a",iConfig.getParameter<edm::ParameterSet>("ExternalDecays").getParameter<edm::ParameterSet>("Tauola")));
   // you must call tauola_->setRandomEngine(RandomNumberGenerator); every event to properly pass the random number with the multi-threading
   srand(time(NULL)); // Should we use RandomNumberGenerator service?
 
   if(forceTauPlusHelicity_ != 0) 
     edm::LogInfo("MuonReplacement") << "[ParticleReplacer::ParticleReplacer] "
                                     << "Forcing tau+ to helicity " << forceTauPlusHelicity_ << std::endl;
   if(forceTauMinusHelicity_ != 0)
     edm::LogInfo("MuonReplacement") << "[ParticleReplacer::ParticleReplacer] "
                                     << "Forcing tau- to helicity " << forceTauMinusHelicity_ << std::endl;
   if(forceTauPlusHelicity_ == 0 && forceTauMinusHelicity_ == 0)
     edm::LogInfo("MuonReplacement") << "[ParticleReplacer::ParticleReplacer] "
                                     << "     Forcing tau helicity as decayed from a " << forceTauPolarization_ << std::endl; 
   if(forceTauDecay_ != "" && forceTauDecay_ != "none")
     edm::LogInfo("MuonReplacement") << "[ParticleReplacer::ParticleReplacer] "
                                     << "Forcing tau decaying into " << forceTauDecay_ << std::endl;
 
   std::memset(pol1_, 0, 4*sizeof(float));
   std::memset(pol2_, 0, 4*sizeof(float));
 
   if(generatorMode_ != "Tauola")
     throw cms::Exception("Configuration") << "Generator mode other than Tauola is not supported" << std::endl;
 
   throw cms::Exception("UnimplementedFeature") << "ParticleReplacerParticleGun is not usable yet." << std::endl;
 }

virtual ParticleReplacerParticleGun::~ParticleReplacerParticleGun ( )

inlinevirtual

Definition at line 29 of file ParticleReplacerParticleGun.h.

29 {}

Member Function Documentation

void ParticleReplacerParticleGun::beginJob ( void )

virtual

Reimplemented from ParticleReplacerBase.

Definition at line 51 of file ParticleReplacerParticleGun.cc.

References funct::abs(), gunParticle_, pythia_, and gen::Pythia6Service::setGeneralParams().

 {
   gen::Pythia6Service::InstanceWrapper guard(&pythia_);
 
   pythia_.setGeneralParams();
 
   if(abs(gunParticle_) == 15) {
     /* FIXME
     call_tauola(-1,1);
     */
   }
 }

void ParticleReplacerParticleGun::correctTauMass	(	const std::vector< reco::Particle > &	muons,
		std::vector< HepMC::FourVector > &	corrected
	)

private

Definition at line 225 of file ParticleReplacerParticleGun.cc.

References funct::abs(), gunParticle_, mathSSE::sqrt(), and tauMass.

Referenced by produce().

 {
   if(abs(gunParticle_) == 15) {
     // Correct energy for tau
     for(std::vector<reco::Particle>::const_iterator iMuon = muons.begin(); iMuon != muons.end(); ++iMuon) {
       const reco::Candidate::LorentzVector& vec = iMuon->p4();
 
       double E = sqrt(tauMass*tauMass + vec.x()*vec.x() + vec.y()*vec.y() + vec.z()*vec.z());
 
       corrected.push_back(HepMC::FourVector(vec.x(), vec.y(), vec.z(), E));
     }
   }
   else {
     // Just copy the LorentzVector
     for(std::vector<reco::Particle>::const_iterator iMuon = muons.begin(); iMuon != muons.end(); ++iMuon) {
       corrected.push_back(iMuon->p4());
     }
   }
 }

void ParticleReplacerParticleGun::endJob ( void )

virtual

Reimplemented from ParticleReplacerBase.

Definition at line 64 of file ParticleReplacerParticleGun.cc.

References funct::abs(), and gunParticle_.

 {
   if(abs(gunParticle_) == 15) {
     /* FIXME
        call_tauola(1,1);
     */
   }
 }

void ParticleReplacerParticleGun::forceTauolaTauDecays ( )

private

Definition at line 245 of file ParticleReplacerParticleGun.cc.

References forceTauDecay_.

Referenced by produce().

                                                        {
   if(forceTauDecay_ == "" || forceTauDecay_ == "none") return;
 
   // for documentation look at Tauola file tauola_photos_ini.f
   // COMMON block COMMON / TAUBRA / GAMPRT(30),JLIST(30),NCHAN
 
   if(forceTauDecay_ == "hadrons"){
     /* FIXME
     taubra.gamprt[0] = 0; // disable branchings to electrons in Tauola
     taubra.gamprt[1] = 0; // disable branchings to muons in Tauola
     */
   }
   else if(forceTauDecay_ == "1prong"){
     /* FIXME
     taubra.gamprt[0]  = 0; // disable branchings to electrons in Tauola
     taubra.gamprt[1]  = 0; // disable branchings to muons in Tauola
     taubra.gamprt[7]  = 0;
     taubra.gamprt[9]  = 0;
     taubra.gamprt[10] = 0;
     taubra.gamprt[11] = 0;
     taubra.gamprt[12] = 0;
     taubra.gamprt[13] = 0;
     taubra.gamprt[17] = 0;
     */
   }
   else if(forceTauDecay_ == "3prong"){
     /* FIXME
     taubra.gamprt[0]  = 0; // disable branchings to electrons in Tauola
     taubra.gamprt[1]  = 0; // disable branchings to muons in Tauola
     taubra.gamprt[2]  = 0;
     taubra.gamprt[3]  = 0;
     taubra.gamprt[4]  = 0;
     taubra.gamprt[5]  = 0;
     taubra.gamprt[6]  = 0;
     taubra.gamprt[8]  = 0;
     taubra.gamprt[14] = 0;
     taubra.gamprt[15] = 0;
     taubra.gamprt[16] = 0;
     taubra.gamprt[18] = 0;
     taubra.gamprt[19] = 0;
     taubra.gamprt[20] = 0;
     taubra.gamprt[21] = 0;
     */
   }
   else 
     edm::LogError("MuonReplacement") << "[ParticleReplacerAlgoParticleGun::forceTauoladecays] "
                                      << "Unknown value for forcing tau decays: " << forceTauDecay_ << std::endl;
 }

std::auto_ptr< HepMC::GenEvent > ParticleReplacerParticleGun::produce	(	const std::vector< reco::Particle > &	muons,
		const reco::Vertex *	evtVtx = `0`,
		const HepMC::GenEvent *	genEvt = `0`,
		MCParticleReplacer *	producer = `0`
	)

virtual

Implements ParticleReplacerBase.

Definition at line 73 of file ParticleReplacerParticleGun.cc.

References funct::abs(), call_py1ent(), call_pyexec(), gen::call_pylist(), RecoTauCleanerPlugins::charge, conv, correctTauMass(), gather_cfg::cout, Exception, forceTauolaTauDecays(), gunParticle_, i, metsig::muon, particleOrigin_, pi, point, pythia_, edm::shift, tree::t, tauola_forParticleGun(), ParticleReplacerBase::verbosity_, reco::Particle::vx(), reco::Particle::vy(), reco::Particle::vz(), reco::Vertex::x(), x(), detailsBasic3DVector::y, reco::Vertex::y(), detailsBasic3DVector::z, and reco::Vertex::z().

 {
   if(genEvt != 0)
     throw cms::Exception("UnimplementedFeature") << "ParticleReplacerParticleGun does NOT support merging at HepMC level" << std::endl;
 
   std::auto_ptr<HepMC::GenEvent> evt(0);
   std::vector<HepMC::FourVector> muons_corrected;
   muons_corrected.reserve(muons.size());
   correctTauMass(muons, muons_corrected);
 
   gen::Pythia6Service::InstanceWrapper guard(&pythia_);
 
   for(unsigned int i=0; i<muons_corrected.size(); ++i) {
     HepMC::FourVector& muon = muons_corrected[i];
     call_py1ent(i+1, gunParticle_*muons[i].charge(), muon.e(), muon.theta(), muon.phi());
   }
 
   // Let's not do a call_pyexec here because it's unnecessary
 
   if(verbosity_) {
     std::cout << " /////////////////////  After py1ent, before pyhepc /////////////////////" << std::endl;
     call_pylist(3);
   }
 
   // Vertex shift
   call_pyhepc(1); // pythia -> hepevt
 
   if(verbosity_) {
     std::cout << " /////////////////////  After pyhepc, before vertex shift /////////////////////" << std::endl;
     HepMC::HEPEVT_Wrapper::print_hepevt();
   }
   // Search for HepMC/HEPEVT_Wrapper.h for the wrapper interface
   int nparticles = HepMC::HEPEVT_Wrapper::number_entries();
   HepMC::ThreeVector shift(0,0,0); 
   if(particleOrigin_ == "primaryVertex") {
     if(!evtVtx)
       throw cms::Exception("LogicError") << "Particle origin set to primaryVertex, but pvtx is null!" << std::endl;
 
     shift.setX(evtVtx->x()*10); // cm -> mm
     shift.setY(evtVtx->y()*10); // cm -> mm
     shift.setZ(evtVtx->z()*10); // cm -> mm
   }
   for(int i=1; i <= nparticles; ++i) {
     if(abs(HepMC::HEPEVT_Wrapper::id(i)) != abs(gunParticle_)) {
       throw cms::Exception("LogicError") << "Particle in HEPEVT is " << HepMC::HEPEVT_Wrapper::id(i)
                                          << " is not the same as gunParticle " << gunParticle_
                                          << " for index " << i << std::endl;
     }
 
     if(particleOrigin_ == "muonReferencePoint") {
       const reco::Particle& muon = muons[i-1];
       shift.setX(muon.vx()*10); // cm -> mm
       shift.setY(muon.vy()*10); // cm -> mm
       shift.setZ(muon.vz()*10); // cm -> mm
     }
 
     HepMC::HEPEVT_Wrapper::set_position(i,
                                         HepMC::HEPEVT_Wrapper::x(i) + shift.x(),
                                         HepMC::HEPEVT_Wrapper::y(i) + shift.y(),
                                         HepMC::HEPEVT_Wrapper::z(i) + shift.z(),
                                         HepMC::HEPEVT_Wrapper::t(i));
   }
 
   if(verbosity_) {
     std::cout << " /////////////////////  After vertex shift, before pyhepc/tauola /////////////////////" << std::endl;
     HepMC::HEPEVT_Wrapper::print_hepevt();
   }
 
   if(abs(gunParticle_) == 15){
     // Code example from TauolaInterface::processEvent()
     /* FIXME
     int dummy = -1;
     int numGenParticles_beforeTAUOLA = call_ihepdim(dummy);
     */
 
     forceTauolaTauDecays();
 
     for(unsigned int i=0; i<muons_corrected.size(); ++i) {
       tauola_forParticleGun(i+1, gunParticle_*muons[i].charge(), muons_corrected[i]);
     }
 
     if(verbosity_) {
       std::cout << " /////////////////////  After tauola, before pyhepc  /////////////////////" << std::endl;
       HepMC::HEPEVT_Wrapper::print_hepevt();
     }
     call_pyhepc(2); // hepevt->pythia
     if(verbosity_) {
       std::cout << " /////////////////////  After pyhepc, before vertex fix  /////////////////////" << std::endl;
       call_pylist(3);
     }
 
     // Fix tau decay vertex position
     /* FIXME
     int numGenParticles_afterTAUOLA = call_ihepdim(dummy);
     tauola_.setDecayVertex(numGenParticles_beforeTAUOLA, numGenParticles_afterTAUOLA);
     */
 
     if(verbosity_) {
       /* FIXME
       std::cout << "     numGenParticles_beforeTAUOLA " << numGenParticles_beforeTAUOLA << std::endl
                 << "     numGenParticles_afterTAUOLA  " << numGenParticles_afterTAUOLA << std::endl;
       */
       std::cout << " /////////////////////  After vertex fix, before pyexec  /////////////////////" << std::endl;
       call_pylist(3);
     }
   }
   else {
     call_pyhepc(2); // hepevt->pythia
     if(verbosity_) {
       std::cout << " /////////////////////  After pyhepc, before pyexec  /////////////////////" << std::endl;
       call_pylist(3);
     }
   }
 
   call_pyexec(); // taus: decay pi0's etc; others: decay whatever
 
   if(verbosity_) {
     std::cout << " /////////////////////  After pyexec, before pyhepc  /////////////////////" << std::endl;
     call_pylist(3);
   }
 
   call_pyhepc(1); // pythia -> hepevt
 
   HepMC::IO_HEPEVT conv;
   evt = std::auto_ptr<HepMC::GenEvent>(new HepMC::GenEvent(*conv.read_next_event()));
 
   if(verbosity_) {
     evt->print();
 
     std::cout << std::endl << "Vertices: " << std::endl;
     for(HepMC::GenEvent::vertex_const_iterator iter = evt->vertices_begin(); iter != evt->vertices_end(); ++iter) {
       std::cout << "Vertex " << (*iter)->id() << ", barcode " << (*iter)->barcode() << std::endl;
 
       HepMC::ThreeVector point = (*iter)->point3d();
       std::cout << "  Point (" << point.x() << ", " << point.y() << ", " << point.z() << ")" << std::endl;
 
       std::cout << "  Incoming particles: ";
       for(HepMC::GenVertex::particles_in_const_iterator pi = (*iter)->particles_in_const_begin(); pi != (*iter)->particles_in_const_end(); ++pi) {
         std::cout << (*pi)->pdg_id() << " ";
       }
       std::cout << std::endl;
       std::cout << "  Outgoing particles: ";
       for(HepMC::GenVertex::particles_out_const_iterator pi = (*iter)->particles_out_const_begin(); pi != (*iter)->particles_out_const_end(); ++pi) {
         std::cout << (*pi)->pdg_id() << " ";
       }
       std::cout << std::endl << std::endl;
     }
   }
 
   return evt;
 }

float ParticleReplacerParticleGun::randomPolarization ( )

private

Definition at line 415 of file ParticleReplacerParticleGun.cc.

References rand().

Referenced by tauHelicity().

 {
   uint32_t randomNumber = rand();
   if(randomNumber%2 > 0.5) return 1; 
   return -1;
 }

float ParticleReplacerParticleGun::tauHelicity ( int pdg_id )

private

Definition at line 367 of file ParticleReplacerParticleGun.cc.

References forceTauMinusHelicity_, forceTauPlusHelicity_, forceTauPolarization_, pol1_, pol2_, and randomPolarization().

Referenced by tauola_forParticleGun().

 {
   /* tau polarization summary from Tauola source code:
      in all cases      W : pol1 = -1, pol2 = -1 (tau or neutrino)
      H+: pol1 = +1, pol2 = +1 (tau or neutrino)
 
      if neutral higgs    : pol1 = +1, pol2 = -1 OR pol1 = -1, pol2 = +1 (tau tau)
      if Z or undetermined: pol1 = +1, pol2 = +1 OR pol1 = -1, pol2 = -1 (tau tau)
   */
 
   if(pdg_id < 0) { // tau+
     if(forceTauPlusHelicity_ != 0) {
       return forceTauPlusHelicity_;
     }
     if(forceTauPolarization_ == "W") return -1;
     if(forceTauPolarization_ == "H+") return 1;
     if(pol2_[2] != 0) {
       if(forceTauPolarization_ == "h" ||
          forceTauPolarization_ == "H" ||
          forceTauPolarization_ == "A") return -pol2_[2];
       else return pol2_[2];
     }
     else {
       return randomPolarization(); //all other cases random, when first tau
     }
   }
   else {           // tau-
     if(forceTauMinusHelicity_ != 0) {
       return forceTauMinusHelicity_;
     }
     if(forceTauPolarization_ == "W") return -1;
     if(forceTauPolarization_ == "H+") return 1;
     if(pol1_[2] != 0){
       if(forceTauPolarization_ == "h" ||
          forceTauPolarization_ == "H" ||
          forceTauPolarization_ == "A") return -pol1_[2];
       else return pol1_[2];
     }
     else {
       return randomPolarization(); //all other cases random, when first tau
     }
   }
 
   edm::LogError("MuonReplacement") << "[ParticleReplacerAlgoParticleGun::tauHelicity] "
                                    << "tauHelicity undetermined, returning 0" << std::endl;
   return 0;
 }

void ParticleReplacerParticleGun::tauola_forParticleGun	(	int	tau_idx,
		int	pdg_id,
		const HepMC::FourVector &	particle_momentum
	)

private

Definition at line 294 of file ParticleReplacerParticleGun.cc.

References funct::abs(), pol1_, pol2_, and tauHelicity().

Referenced by produce().

 {
   if(abs(pdg_id) != 15) {
     edm::LogError("MuonReplacement") << "[ParticleReplacerAlgoParticleGun::tauola_forParticleGuns] "
                                      << "Trying to decay something else than tau: pdg_id = " << pdg_id << std::endl;
     return;
   }
 
   // By default the index of tau+ is 3 and tau- is 4. The TAUOLA
   // routine takes internally care of finding the correct
   // position of the tau which is decayed. However, since we are
   // calling DEXAY routine directly by ourselves, we must set
   // the index manually by ourselves. Fortunately, this seems to
   // be simple.
   /* FIXME
   if(verbosity_)
     std::cout << " Tauola taupos common block: np1 " << taupos.np1 << " np2 " << taupos.np2 << std::endl;
   taupos.np1 = tau_idx;
   taupos.np2 = tau_idx;
   if(verbosity_)
     std::cout << " Resetting taupos common block to: np1 " << taupos.np1 << " np2 " << taupos.np2 << std::endl;
   */
 
   if(pdg_id == -15){ // tau+
 
     pol1_[2] = tauHelicity(pdg_id);
 
     /* FIXME
     momdec.p1[0] = particle_momentum.x();
     momdec.p1[1] = particle_momentum.y();
     momdec.p1[2] = particle_momentum.z();
     momdec.p1[3] = particle_momentum.e();
 
     momdec.p2[0] = -momdec.p1[0];
     momdec.p2[1] = -momdec.p1[1];
     momdec.p2[2] = -momdec.p1[2];
     momdec.p2[3] =  momdec.p1[3];
 
     // "mother" p4
     momdec.q1[0] = 0;
     momdec.q1[1] = 0;
     momdec.q1[2] = 0;
     momdec.q1[3] = momdec.p1[3] + momdec.p2[3];
 
     call_dexay(1,pol1);
     */
   }
   else if (pdg_id == 15){ // tau-
 
     pol2_[2] = tauHelicity(pdg_id);
 
     /* FIXME
     momdec.p2[0] = particle_momentum.x();
     momdec.p2[1] = particle_momentum.y();
     momdec.p2[2] = particle_momentum.z();
     momdec.p2[3] = particle_momentum.e();
 
     momdec.p1[0] = -momdec.p2[0];
     momdec.p1[1] = -momdec.p2[1];
     momdec.p1[2] = -momdec.p2[2];
     momdec.p1[3] =  momdec.p2[3];
 
     // "mother" p4
     momdec.q1[0] = 0;
     momdec.q1[1] = 0;
     momdec.q1[2] = 0;
     momdec.q1[3] = momdec.p1[3] + momdec.p2[3];
 
     call_dexay(2,pol2);
     */
   }
 }