TopDecaySubset Class Reference

Module to produce the subset of generator particles directly contained in top decay chains. More...

#include "TopQuarkAnalysis/TopEventProducers/interface/TopDecaySubset.h"

Inheritance diagram for TopDecaySubset:

Public Types
enum	FillMode { kStable, kME }
enum	RunMode { kRun1, kRun2 }
	supported modes to run the code More...
enum	ShowerModel {   kStart =-1, kNone, kPythia, kHerwig,   kPythia8, kSherpa }
	classification of potential shower types More...
Public Types inherited from edm::EDProducer
typedef EDProducer	ModuleType
Public Types inherited from edm::ProducerBase
typedef ProductRegistryHelper::TypeLabelList	TypeLabelList
Public Types inherited from edm::EDConsumerBase
typedef ProductLabels	Labels

Public Member Functions
virtual void	produce (edm::Event &event, const edm::EventSetup &setup)
	write output into the event More...
	TopDecaySubset (const edm::ParameterSet &cfg)
	default constructor More...
	~TopDecaySubset ()
	default destructor More...
Public Member Functions inherited from edm::EDProducer
	EDProducer ()
ModuleDescription const &	moduleDescription () const
virtual	~EDProducer ()
Public Member Functions inherited from edm::ProducerBase
void	callWhenNewProductsRegistered (std::function< void(BranchDescription const &)> const &func)
	ProducerBase ()
void	registerProducts (ProducerBase *, ProductRegistry *, ModuleDescription const &)
std::function< void(BranchDescription const &)>	registrationCallback () const
	used by the fwk to register list of products More...
virtual	~ProducerBase ()
Public Member Functions inherited from edm::EDConsumerBase
std::vector< ConsumesInfo >	consumesInfo () const
	EDConsumerBase ()
ProductHolderIndexAndSkipBit	indexFrom (EDGetToken, BranchType, TypeID const &) const
void	itemsMayGet (BranchType, std::vector< ProductHolderIndexAndSkipBit > &) const
void	itemsToGet (BranchType, std::vector< ProductHolderIndexAndSkipBit > &) const
std::vector < ProductHolderIndexAndSkipBit > const &	itemsToGetFromEvent () const
void	labelsForToken (EDGetToken iToken, Labels &oLabels) const
void	modulesDependentUpon (const std::string &iProcessName, std::vector< const char * > &oModuleLabels) const
void	modulesWhoseProductsAreConsumed (std::vector< ModuleDescription const * > &modules, ProductRegistry const &preg, std::map< std::string, ModuleDescription const * > const &labelsToDesc, std::string const &processName) const
bool	registeredToConsume (ProductHolderIndex, bool, BranchType) const
bool	registeredToConsumeMany (TypeID const &, BranchType) const
void	updateLookup (BranchType iBranchType, ProductHolderIndexHelper const &)
virtual	~EDConsumerBase ()

Private Member Functions
void	addDaughters (int &idx, const reco::GenParticle::const_iterator part, reco::GenParticleCollection &target, bool recursive=true)
	recursively fill vector for all further decay particles of a given particle More...
void	addRadiation (int &idx, const reco::GenParticle::const_iterator part, reco::GenParticleCollection &target)
	fill vector including all radiations from quarks originating from W/top More...
void	addRadiation (int &idx, const reco::GenParticle *part, reco::GenParticleCollection &target)
ShowerModel	checkShowerModel (const std::vector< const reco::GenParticle * > &tops) const
	check the decay chain for the used shower model More...
ShowerModel	checkShowerModel (edm::Event &event)
	check the embedded MC information for the shower model More...
void	checkWBosons (std::vector< const reco::GenParticle * > &tops) const
	check whether W bosons are contained in the original gen particle listing More...
void	clearReferences ()
	clear references More...
void	fillListing (const std::vector< const reco::GenParticle * > &tops, reco::GenParticleCollection &target)
	fill output vector for full decay chain More...
void	fillListing (const std::vector< const reco::GenParticle * > &primalTops, const std::vector< const reco::GenParticle * > &decayingTops, reco::GenParticleCollection &target)
	fill output vector for full decay chain More...
void	fillReferences (const reco::GenParticleRefProd &refProd, reco::GenParticleCollection &target)
	fill references for output vector More...
std::vector< const reco::GenParticle * >	findDecayingTops (const reco::GenParticleCollection &parts)
const reco::GenParticle *	findLastParticleInChain (const reco::GenParticle *p)
std::vector< const reco::GenParticle * >	findPrimalTops (const reco::GenParticleCollection &parts)
const reco::GenParticle *	findPrimalW (const reco::GenParticle *top)
std::vector< const reco::GenParticle * >	findTops (const reco::GenParticleCollection &parts)
	find top quarks in list of input particles More...
reco::Particle::LorentzVector	p4 (const std::vector< const reco::GenParticle * >::const_iterator top, int statusFlag)
	calculate lorentz vector from input (dedicated to top reconstruction) More...
reco::Particle::LorentzVector	p4 (const reco::GenParticle::const_iterator part, int statusFlag)
	calculate lorentz vector from input More...

Private Attributes
bool	addRadiation_
	add radiation or not? More...
FillMode	fillMode_
edm::EDGetTokenT < GenEventInfoProduct >	genEventInfo_srcToken_
	input tag for the genEventInfo source More...
int	motherPartIdx_
std::map< int, std::vector< int > >	refs_
	management of daughter indices for fillRefs More...
RunMode	runMode_
	run mode (Run1 || Run2) More...
ShowerModel	showerModel_
	parton shower mode (filled in checkShowerModel) More...
edm::EDGetTokenT < reco::GenParticleCollection >	srcToken_
	input tag for the genParticle source More...

Additional Inherited Members
Static Public Member Functions inherited from edm::EDProducer
static const std::string &	baseType ()
static void	fillDescriptions (ConfigurationDescriptions &descriptions)
static void	prevalidate (ConfigurationDescriptions &descriptions)
Protected Member Functions inherited from edm::EDConsumerBase
template<typename ProductType , BranchType B = InEvent>
EDGetTokenT< ProductType >	consumes (edm::InputTag const &tag)
EDGetToken	consumes (const TypeToGet &id, edm::InputTag const &tag)
template<BranchType B>
EDGetToken	consumes (TypeToGet const &id, edm::InputTag const &tag)
ConsumesCollector	consumesCollector ()
	Use a ConsumesCollector to gather consumes information from helper functions. More...
template<typename ProductType , BranchType B = InEvent>
void	consumesMany ()
void	consumesMany (const TypeToGet &id)
template<BranchType B>
void	consumesMany (const TypeToGet &id)
template<typename ProductType , BranchType B = InEvent>
EDGetTokenT< ProductType >	mayConsume (edm::InputTag const &tag)
EDGetToken	mayConsume (const TypeToGet &id, edm::InputTag const &tag)
template<BranchType B>
EDGetToken	mayConsume (const TypeToGet &id, edm::InputTag const &tag)

Detailed Description

Module to produce the subset of generator particles directly contained in top decay chains.

The module produces the subset of generator particles directly contained in top decay chains. The particles are saved as a collection of reco::GenParticles. Depending on the configuration of the module, the 4-vector kinematics can be taken from the status-3 particles (ME before parton showering) or from the status-2 particles (after parton showering), additionally radiated gluons may be considered during the creation of the subset or not.

Definition at line 29 of file TopDecaySubset.h.

Member Enumeration Documentation

enum TopDecaySubset::FillMode

supported modes to fill the new vectors of gen particles

Enumerator
kStable
kME

Definition at line 34 of file TopDecaySubset.h.

{kStable, kME};

enum TopDecaySubset::RunMode

supported modes to run the code

Enumerator
kRun1
kRun2

Definition at line 38 of file TopDecaySubset.h.

{kRun1, kRun2};

enum TopDecaySubset::ShowerModel

classification of potential shower types

Enumerator
kStart
kNone
kPythia
kHerwig
kPythia8
kSherpa

Definition at line 36 of file TopDecaySubset.h.

{kStart=-1, kNone, kPythia, kHerwig, kPythia8, kSherpa};

Constructor & Destructor Documentation

TopDecaySubset::TopDecaySubset ( const edm::ParameterSet &  cfg )

explicit

default constructor

Definition at line 10 of file TopDecaySubset.cc.

References edm::hlt::Exception, fillMode_, edm::ParameterSet::getParameter(), kME, kRun1, kRun2, kStable, alignBH_cfg::mode, runMode_, and AlCaHLTBitMon_QueryRunRegistry::string.

                                                        :
  srcToken_         (consumes<reco::GenParticleCollection>(cfg.getParameter<edm::InputTag>("src"))),
  genEventInfo_srcToken_ (mayConsume < GenEventInfoProduct > (edm::InputTag("generator"))),
  addRadiation_(cfg.getParameter<bool>("addRadiation")),
  showerModel_ (kStart),
  runMode_(kRun1)
{
  // mapping of the corresponding fillMode; see FillMode
  // enumerator of TopDecaySubset for available modes
  std::string mode = cfg.getParameter<std::string>( "fillMode" );
  if(mode=="kME")
    fillMode_=kME;
  else if(mode=="kStable")
    fillMode_=kStable;
  else
    throw cms::Exception("Configuration") << mode << " is not a supported FillMode!\n";

  mode = cfg.getParameter<std::string>( "runMode" );
    if(mode=="Run1")
      runMode_=kRun1;
    else if(mode=="Run2")
        runMode_=kRun2;
    else
      throw cms::Exception("Configuration") << mode << " is not a supported RunMode!\n";

  // produces a set of GenParticles following
  // the decay branch of top quarks to the first level of
  // stable decay products
  produces<reco::GenParticleCollection>();
}

TopDecaySubset::~TopDecaySubset

(

)

default destructor

Definition at line 42 of file TopDecaySubset.cc.

{
}

Member Function Documentation

void TopDecaySubset::addDaughters ( int &  idx, const reco::GenParticle::const_iterator  part, reco::GenParticleCollection &  target, bool  recursive = true  )

private

recursively fill vector for all further decay particles of a given particle

Definition at line 680 of file TopDecaySubset.cc.

References reco::Candidate::begin(), reco::Candidate::end(), customizeTrackingMonitorSeedNumber::idx, and refs_.

Referenced by fillListing().

{
  std::vector<int> daughters;
  int idxBuffer = idx;
  for(reco::GenParticle::const_iterator daughter=part->begin(); daughter!=part->end(); ++daughter){
      std::auto_ptr<reco::GenParticle> ptr( new reco::GenParticle( daughter->threeCharge(), daughter->p4(), daughter->vertex(), daughter->pdgId(), daughter->status(), false) );
      target.push_back( *ptr );
      // increment & push index of daughter
      daughters.push_back( ++idx );
      // continue recursively if desired
      if(recursive){
    addDaughters(idx,daughter,target);
      }
  }
  if(daughters.size()) {
    refs_[ idxBuffer ] = daughters;
  }
}

void TopDecaySubset::addRadiation ( int &  idx, const reco::GenParticle::const_iterator  part, reco::GenParticleCollection &  target  )

private

fill vector including all radiations from quarks originating from W/top

Definition at line 635 of file TopDecaySubset.cc.

References reco::Candidate::begin(), reco::Candidate::end(), customizeTrackingMonitorSeedNumber::idx, reco::Candidate::pdgId(), refs_, and TopDecayID::stable.

Referenced by fillListing().

{
  std::vector<int> daughters;
  int idxBuffer = idx;
  for(reco::GenParticle::const_iterator daughter=part->begin(); daughter!=part->end(); ++daughter){
    if(daughter->status()<=TopDecayID::stable && daughter->pdgId()!=part->pdgId()){
      // skip comment lines and make sure that
      // the particle is not double counted as
      // daughter of itself
      std::auto_ptr<reco::GenParticle> ptr(  new reco::GenParticle( daughter->threeCharge(), daughter->p4(), daughter->vertex(), daughter->pdgId(), daughter->status(), false) );
      target.push_back( *ptr );
      daughters.push_back( ++idx ); //push index of daughter
    }
  }
  if(daughters.size()) {
    refs_[ idxBuffer ] = daughters;
  }
}

void TopDecaySubset::addRadiation ( int &  idx, const reco::GenParticle *  part, reco::GenParticleCollection &  target  )

private

Definition at line 654 of file TopDecaySubset.cc.

References reco::Candidate::begin(), reco::Candidate::end(), customizeTrackingMonitorSeedNumber::idx, reco::LeafCandidate::pdgId(), and refs_.

                                           {
    std::vector<int> daughters;
    int idxBuffer = idx;
    for (reco::GenParticle::const_iterator daughter = part->begin();
            daughter != part->end(); ++daughter) {
        // either pick daughters as long as they are different
        // to the initial particle
        if (daughter->pdgId() != part->pdgId()) {
            std::auto_ptr < reco::GenParticle
                    > ptr(
                            new reco::GenParticle(daughter->threeCharge(),
                                    daughter->p4(), daughter->vertex(),
                                    daughter->pdgId(), daughter->status(),
                                    false));
            target.push_back(*ptr);
            daughters.push_back(++idx); //push index of daughter
        }
    }
    if (daughters.size()) {
        refs_[idxBuffer] = daughters;
    }
}

TopDecaySubset::ShowerModel TopDecaySubset::checkShowerModel ( const std::vector< const reco::GenParticle * > &  tops ) const

private

check the decay chain for the used shower model

check the decay chain for the exploited shower model

Definition at line 219 of file TopDecaySubset.cc.

References funct::abs(), reco::Candidate::begin(), reco::Candidate::end(), edm::hlt::Exception, kHerwig, kNone, kPythia, edm::errors::LogicError, reco::CompositeRefCandidateT< D >::numberOfDaughters(), reco::Candidate::numberOfDaughters(), reco::Candidate::pdgId(), reco::LeafCandidate::pdgId(), TopDecayID::stable, reco::Candidate::status(), TopDecayID::tID, and TopDecayID::WID.

Referenced by produce().

{
  for(std::vector<const reco::GenParticle*>::const_iterator it=tops.begin(); it!=tops.end(); ++it){
    const reco::GenParticle* top = *it;
    // check for kHerwig type showers: here the status 3 top quark will
    // have a single status 2 top quark as daughter, which has again 3
    // or more status 2 daughters
    if( top->numberOfDaughters()==1){
      if( top->begin()->pdgId()==top->pdgId() && top->begin()->status()==TopDecayID::stable && top->begin()->numberOfDaughters()>1)
    return kHerwig;
    }
    // check for kPythia type showers: here the status 3 top quark will
    // have all decay products and a status 2 top quark as daughters
    // the status 2 top quark will be w/o further daughters
    if( top->numberOfDaughters()>1 ){
      bool containsWBoson=false, containsQuarkDaughter=false;
      for(reco::GenParticle::const_iterator td=top->begin(); td!=top->end(); ++td){
    if( std::abs(td->pdgId ()) <TopDecayID::tID ) containsQuarkDaughter=true;
    if( std::abs(td->pdgId ())==TopDecayID::WID ) containsWBoson=true;
      }
      if(containsQuarkDaughter && containsWBoson)
    return kPythia;
    }
  }
  // if neither Herwig nor Pythia like
  if(tops.size()==0)
    edm::LogInfo("decayChain")
      << " Failed to find top quarks in decay chain. Will assume that this a \n"
      << " non-top sample and produce an empty decaySubset.\n";
  else
    throw edm::Exception(edm::errors::LogicError,
             " Can not find back any of the supported hadronization models. Models \n"
             " which are supported are:                                            \n"
             " Pythia  LO(+PS): Top(status 3) --> WBoson(status 3), Quark(status 3)\n"
             " Herwig NLO(+PS): Top(status 2) --> Top(status 3) --> Top(status 2)  \n");
  return kNone;
}

TopDecaySubset::ShowerModel TopDecaySubset::checkShowerModel ( edm::Event &  event )

private

check the embedded MC information for the shower model

Definition at line 258 of file TopDecaySubset.cc.

References genEventInfo_srcToken_, edm::HandleBase::id(), edm::HandleBase::isValid(), kHerwig, kNone, kPythia, kPythia8, kSherpa, kStart, edm::moduleName(), and AlCaHLTBitMon_QueryRunRegistry::string.

                         {
    edm::Handle < GenEventInfoProduct > genEvtInfoProduct;
    event.getByToken(genEventInfo_srcToken_, genEvtInfoProduct);

    std::string moduleName = "";
    if (genEvtInfoProduct.isValid()) {
        const edm::Provenance& prov = event.getProvenance(
                genEvtInfoProduct.id());
        moduleName = edm::moduleName(prov);
    }

    ShowerModel shower(kStart);
    if (moduleName.find("Pythia6") != std::string::npos)
        shower = kPythia;
    else if (moduleName.find("Pythia8") != std::string::npos)
        shower = kPythia8;
    else if (moduleName.find("Herwig6") != std::string::npos)
        shower = kHerwig;
    else if (moduleName.find("ThePEG") != std::string::npos)
        // Herwig++
        shower = kHerwig;
    else if (moduleName.find("Sherpa") != std::string::npos)
        shower = kSherpa;
    else
        shower = kNone;
    return shower;
}

void TopDecaySubset::checkWBosons ( std::vector< const reco::GenParticle * > &  tops ) const

private

check whether W bosons are contained in the original gen particle listing

check whether the W boson is contained in the original gen particle listing

Definition at line 288 of file TopDecaySubset.cc.

References funct::abs(), reco::Candidate::begin(), reco::Candidate::end(), lhef::isContained(), kPythia, edm::errors::LogicError, showerModel_, TopDecayID::stable, TopDecayID::unfrag, and TopDecayID::WID.

Referenced by produce().

{
  unsigned nTops = tops.size();
  for(std::vector<const reco::GenParticle*>::iterator it=tops.begin(); it!=tops.end();) {
    const reco::GenParticle* top = *it;
    bool isContained=false;
    bool expectedStatus=false;
    if(showerModel_!=kPythia && top->begin()==top->end())
      throw edm::Exception(edm::errors::LogicError,
               "showerModel_!=kPythia && top->begin()==top->end()\n");
    for(reco::GenParticle::const_iterator td=((showerModel_==kPythia) ? top->begin() : top->begin()->begin());
    td!=((showerModel_==kPythia) ? top->end() : top->begin()->end());
    ++td){
      if(std::abs(td->pdgId())==TopDecayID::WID) {
    isContained=true;
    if( ((showerModel_==kPythia) ? td->status()==TopDecayID::unfrag : td->status()==TopDecayID::stable) ) {
      expectedStatus=true;
      break;
    }
      }
    }
    if(!expectedStatus) {
      it=tops.erase(it);
      if(isContained)
    edm::LogInfo("decayChain")
      << " W boson does not have the expected status. This happens, e.g.,      \n"
      << " with MC@NLO in the case of additional ttbar pairs from radiated     \n"
      << " gluons. We hope everything is fine, remove the correspdonding top   \n"
      << " quark from our list since it is not part of the primary ttbar pair  \n"
      << " and try to continue.                                                \n";
    }
    else
      it++;
  }
  if(tops.size()==0 && nTops!=0)
    throw edm::Exception(edm::errors::LogicError,
             " Did not find a W boson with appropriate status for any of the top   \n"
             " quarks in this event. This means that the hadronization of the W    \n"
             " boson might be screwed up or there is another problem with the      \n"
             " particle listing in this MC sample. Please contact an expert.       \n");
}

void TopDecaySubset::clearReferences ( )

private

clear references

Definition at line 701 of file TopDecaySubset.cc.

References motherPartIdx_, and refs_.

Referenced by produce().

{
  // clear vector of references
  refs_.clear();
  // set idx for mother particles to a start value
  // of -1 (the first entry will raise it to 0)
  motherPartIdx_=-1;
}

void TopDecaySubset::fillListing ( const std::vector< const reco::GenParticle * > &  tops, reco::GenParticleCollection &  target  )

private

fill output vector for full decay chain

Definition at line 332 of file TopDecaySubset.cc.

References funct::abs(), addDaughters(), addRadiation(), addRadiation_, reco::Candidate::begin(), TopDecayID::bID, reco::Candidate::end(), edm::false, fillMode_, GenParticle::GenParticle, TopDecayID::glueID, kME, kPythia, edm::errors::LogicError, reco::CompositeRefCandidateT< D >::mother(), motherPartIdx_, reco::CompositeRefCandidateT< D >::numberOfMothers(), reco::Candidate::p4(), p4(), reco::Candidate::pdgId(), reco::LeafCandidate::pdgId(), refs_, showerModel_, TopDecayID::stable, reco::Candidate::status(), tree::t, filterCSVwithJSON::target, TopDecayID::tauID, reco::Candidate::threeCharge(), reco::LeafCandidate::threeCharge(), TopDecayID::tID, funct::true, TopDecayID::unfrag, reco::Candidate::vertex(), reco::LeafCandidate::vertex(), and TopDecayID::WID.

Referenced by produce().

{
  unsigned int statusFlag;
  // determine status flag of the new
  // particle depending on the FillMode
  fillMode_ == kME ? statusFlag=3 : statusFlag=2;

  for(std::vector<const reco::GenParticle*>::const_iterator it=tops.begin(); it!=tops.end(); ++it){
    const reco::GenParticle* t = *it;
    // if particle is top or anti-top
    std::auto_ptr<reco::GenParticle> topPtr( new reco::GenParticle( t->threeCharge(), p4(it, statusFlag), t->vertex(), t->pdgId(), statusFlag, false ) );
    target.push_back( *topPtr );
    ++motherPartIdx_;
    // keep the top index for the map to manage the daughter refs
    int iTop=motherPartIdx_;
    std::vector<int> topDaughters;
    // define the W boson index (to be set later) for the map to
    // manage the daughter refs
    int iW = 0;
    std::vector<int> wDaughters;
    // sanity check
    if(showerModel_!=kPythia && t->begin()==t->end())
      throw edm::Exception(edm::errors::LogicError,
               "showerModel_!=kPythia && t->begin()==t->end()\n");
    //iterate over top daughters
    for(reco::GenParticle::const_iterator td=((showerModel_==kPythia)?t->begin():t->begin()->begin()); td!=((showerModel_==kPythia)?t->end():t->begin()->end()); ++td){
      if( td->status()==TopDecayID::unfrag && std::abs( td->pdgId() )<=TopDecayID::bID ){
    // if particle is beauty or other quark
    std::auto_ptr<reco::GenParticle> bPtr( new reco::GenParticle( td->threeCharge(), p4( td, statusFlag ), td->vertex(), td->pdgId(), statusFlag, false ) );
    target.push_back( *bPtr );
    // increment & push index of the top daughter
    topDaughters.push_back( ++motherPartIdx_ );
    if(addRadiation_){
      addRadiation(motherPartIdx_,td,target);
    }
      }
      // sanity check
      if(showerModel_!=kPythia && td->begin()==td->end())
    throw edm::Exception(edm::errors::LogicError,
                 "showerModel_!=kPythia && td->begin()==td->end()\n");
      reco::GenParticle::const_iterator buffer = (showerModel_==kPythia)?td:td->begin();
      if( buffer->status()==TopDecayID::unfrag && std::abs( buffer->pdgId() )==TopDecayID::WID ){
    // if particle is a W boson
    std::auto_ptr<reco::GenParticle> wPtr(  new reco::GenParticle( buffer->threeCharge(), p4( buffer, statusFlag), buffer->vertex(), buffer->pdgId(), statusFlag, true ) );
    target.push_back( *wPtr );
    // increment & push index of the top daughter
    topDaughters.push_back( ++motherPartIdx_ );
    // keep the W idx for the map
    iW=motherPartIdx_;
    if(addRadiation_){
      addRadiation(motherPartIdx_,buffer,target);
    }
    if(showerModel_!=kPythia && buffer->begin()==buffer->end())
      throw edm::Exception(edm::errors::LogicError,
                   "showerModel_!=kPythia && buffer->begin()==buffer->end()\n");
    // iterate over W daughters
    for(reco::GenParticle::const_iterator wd=((showerModel_==kPythia)?buffer->begin():buffer->begin()->begin()); wd!=((showerModel_==kPythia)?buffer->end():buffer->begin()->end()); ++wd){
      // make sure the W daughter is of status unfrag and not the W itself
      if( wd->status()==TopDecayID::unfrag && !(std::abs(wd->pdgId())==TopDecayID::WID) ) {
        std::auto_ptr<reco::GenParticle> qPtr( new reco::GenParticle( wd->threeCharge(), p4( wd, statusFlag ), wd->vertex(), wd->pdgId(), statusFlag, false) );
        target.push_back( *qPtr );
        // increment & push index of the top daughter
        wDaughters.push_back( ++motherPartIdx_ );
        if( wd->status()==TopDecayID::unfrag && std::abs( wd->pdgId() )==TopDecayID::tauID ){
          // add tau daughters if the particle is a tau pass
          // the daughter of the tau which is of status 2
          //addDaughters(motherPartIdx_, wd->begin(), target);
          // add tau daughters if the particle is a tau pass
          // the tau itself, which may add a tau daughter of
          // of status 2 to the listing
          addDaughters(motherPartIdx_,wd,target);
        }
      }
    }
      }
      if(addRadiation_ && buffer->status()==TopDecayID::stable && ( buffer->pdgId()==TopDecayID::glueID || std::abs(buffer->pdgId())<TopDecayID::bID)){
    // collect additional radiation from the top
    std::auto_ptr<reco::GenParticle> radPtr( new reco::GenParticle( buffer->threeCharge(), buffer->p4(), buffer->vertex(), buffer->pdgId(), statusFlag, false ) );
    target.push_back( *radPtr );
    // increment & push index of the top daughter
    topDaughters.push_back( ++motherPartIdx_ );
      }
    }
    // add potential sisters of the top quark;
    // only for top to prevent double counting
    if(t->numberOfMothers()>0 && t->pdgId()==TopDecayID::tID){
      for(reco::GenParticle::const_iterator ts = t->mother()->begin(); ts!=t->mother()->end(); ++ts){
    // loop over all daughters of the top mother i.e.
    // the two top quarks and their potential sisters
    if(std::abs(ts->pdgId())!=t->pdgId() && ts->pdgId()!=t->mother()->pdgId()){
      // add all further particles but the two top quarks and potential
      // cases where the mother of the top has itself as daughter
      reco::GenParticle* cand = new reco::GenParticle( ts->threeCharge(), ts->p4(), ts->vertex(), ts->pdgId(), ts->status(), false );
      std::auto_ptr<reco::GenParticle> sPtr( cand );
      target.push_back( *sPtr );
      if(ts->begin()!=ts->end()){
        // in case the sister has daughters increment
        // and add the first generation of daughters
        addDaughters(++motherPartIdx_,ts->begin(),target,false);
      }
    }
      }
    }
    // fill the map for the administration
    // of daughter indices
    refs_[ iTop ] = topDaughters;
    refs_[ iW   ] = wDaughters;
  }
}

void TopDecaySubset::fillListing ( const std::vector< const reco::GenParticle * > &  primalTops, const std::vector< const reco::GenParticle * > &  decayingTops, reco::GenParticleCollection &  target  )

private

fill output vector for full decay chain

Definition at line 442 of file TopDecaySubset.cc.

References funct::abs(), addDaughters(), addRadiation(), addRadiation_, reco::Candidate::begin(), TopDecayID::bID, reco::Candidate::end(), edm::false, fillMode_, findLastParticleInChain(), TopDecayID::glueID, kME, motherPartIdx_, reco::LeafCandidate::p4(), reco::LeafCandidate::pdgId(), refs_, reco::LeafCandidate::status(), tree::t, TopDecayID::tauID, reco::LeafCandidate::threeCharge(), reco::LeafCandidate::vertex(), and TopDecayID::WID.

                                           {
  std::vector<const reco::GenParticle*>::const_iterator top_start;
  std::vector<const reco::GenParticle*>::const_iterator top_end;
  if (fillMode_ == kME) {
    top_start = primalTops.begin();
    top_end = primalTops.end();
  } else {
    top_start = decayingTops.begin();
    top_end = decayingTops.end();
  }
    for (std::vector<const reco::GenParticle*>::const_iterator it =
        top_start; it != top_end; ++it) {
        const reco::GenParticle* t = *it;
        // summation might happen here
        std::auto_ptr < reco::GenParticle
                > topPtr(
                        new reco::GenParticle(t->threeCharge(), t->p4(),
                                t->vertex(), t->pdgId(), t->status(), false));
        target.push_back(*topPtr);
        ++motherPartIdx_;

        // keep the top index for the map to manage the daughter refs
        int iTop = motherPartIdx_;
        std::vector<int> topDaughters;
        // define the W boson index (to be set later) for the map to
        // manage the daughter refs
        int iW = 0;
        std::vector<int> wDaughters;
        const reco::GenParticle* final_top = findLastParticleInChain(t);

        //iterate over top daughters
        for (reco::GenParticle::const_iterator td = final_top->begin();
                td != final_top->end(); ++td) {
            if (std::abs(td->pdgId()) <= TopDecayID::bID) {
                // if particle is beauty or other quark
                std::auto_ptr < reco::GenParticle
                        > qPtr(
                                new reco::GenParticle(td->threeCharge(),
                                        td->p4(), td->vertex(), td->pdgId(),
                                        td->status(), false));
                target.push_back(*qPtr);
                // increment & push index of the top daughter
                topDaughters.push_back(++motherPartIdx_);
                if (addRadiation_) {
                    // for radation to be added we first need to
                    // pick the last quark in the MC chain
                    const reco::GenParticle* last_q = findLastParticleInChain(
                            (reco::GenParticle*) &*td);
                    addRadiation(motherPartIdx_, last_q, target);
                }
            } else if (std::abs(td->pdgId()) == TopDecayID::WID) {
                // ladies and gentleman, we have a W boson
                std::auto_ptr < reco::GenParticle
                        > WPtr(
                                new reco::GenParticle(td->threeCharge(),
                                        td->p4(), td->vertex(), td->pdgId(),
                                        td->status(), false));
                target.push_back(*WPtr);
                // increment & push index of the top daughter
                topDaughters.push_back(++motherPartIdx_);
                iW = motherPartIdx_;

                // next are the daughers of our W boson
        // for Pythia 6 this is wrong as the last W has no daughters at all!
        // instead the status 3 W has 3 daughters: q qbar' and W (WTF??!)
                const reco::GenParticle* decaying_W = findLastParticleInChain(
                        (reco::GenParticle*) &*td);
                for (reco::GenParticle::const_iterator wd = decaying_W->begin();
                        wd != decaying_W->end(); ++wd) {
                    if (!(std::abs(wd->pdgId()) == TopDecayID::WID)) {
                        std::auto_ptr < reco::GenParticle
                                > qPtr(
                                        new reco::GenParticle(wd->threeCharge(),
                                                wd->p4(), wd->vertex(),
                                                wd->pdgId(), wd->status(),
                                                false));
                        target.push_back(*qPtr);
                        // increment & push index of the top daughter
                        wDaughters.push_back(++motherPartIdx_);
                        const reco::GenParticle* last_q = findLastParticleInChain(
                                                    (reco::GenParticle*) &*wd);
                        addRadiation(motherPartIdx_, last_q, target);
                        if (std::abs(wd->pdgId()) == TopDecayID::tauID) {
                            // add tau daughters
                            // currently it adds k-mesons etc as well, which
                            // is not what we want.
                            addDaughters(motherPartIdx_, wd, target);
                        }
                    }
                }

            } else {
        if(addRadiation_ && ( td->pdgId()==TopDecayID::glueID ||
            std::abs(td->pdgId())<TopDecayID::bID)){
          // collect additional radiation from the top
          std::auto_ptr<reco::GenParticle> radPtr(
            new reco::GenParticle( td->threeCharge(),
            td->p4(), td->vertex(), td->pdgId(), td->status(), false ) );
          target.push_back( *radPtr );
        }
                //other top daughters like Zq for FCNC
        // for pythia 6 many gluons end up here
                //std::cout << "other top daughters: to be implemented"
                //      << std::endl;
            }
        }

        // fill the map for the administration
        // of daughter indices
        refs_[iTop] = topDaughters;
        refs_[iW] = wDaughters;
    }
}

void TopDecaySubset::fillReferences ( const reco::GenParticleRefProd &  refProd, reco::GenParticleCollection &  target  )

private

fill references for output vector

Definition at line 712 of file TopDecaySubset.cc.

References reco::CompositeRefCandidateT< D >::addDaughter(), edm::hlt::Exception, customizeTrackingMonitorSeedNumber::idx, edm::errors::InvalidReference, AlCaHLTBitMon_ParallelJobs::p, and refs_.

Referenced by produce().

{
  int idx=0;
  for(reco::GenParticleCollection::iterator p=sel.begin(); p!=sel.end(); ++p, ++idx){
    //find daughter reference vectors in refs_ and add daughters
    std::map<int, std::vector<int> >::const_iterator daughters=refs_.find( idx );
    if( daughters!=refs_.end() ){
      for(std::vector<int>::const_iterator daughter = daughters->second.begin();
      daughter!=daughters->second.end(); ++daughter){
    reco::GenParticle* part = dynamic_cast<reco::GenParticle* > (&(*p));
    if(part == 0){
     throw edm::Exception( edm::errors::InvalidReference, "Not a GenParticle" );
    }
    part->addDaughter( reco::GenParticleRef(ref, *daughter) );
    sel[*daughter].addMother( reco::GenParticleRef(ref, idx) );
      }
    }
  }
}

std::vector< const reco::GenParticle * > TopDecaySubset::findDecayingTops ( const reco::GenParticleCollection &  parts )

private

find decaying top quarks (quarks that decay to qW) for Pythia6 this is identical to findPrimalTops

Definition at line 142 of file TopDecaySubset.cc.

References funct::abs(), customizeTrackingMonitorSeedNumber::idx, tree::t, and TopDecayID::tID.

Referenced by produce().

                                                {
    std::vector<const reco::GenParticle*> tops;
    for (reco::GenParticleCollection::const_iterator t = parts.begin();
            t != parts.end(); ++t) {
        if (std::abs(t->pdgId()) != TopDecayID::tID)
            continue;

        bool hasTopDaughter = false;
        for (unsigned idx = 0; idx < t->numberOfDaughters(); ++idx) {
            if (std::abs(t->daughter(idx)->pdgId()) == TopDecayID::tID)
                hasTopDaughter = true;
        }

        if (hasTopDaughter)  // not a decaying top
            continue;
        tops.push_back(&(*t));
    }

    return tops;
}

const reco::GenParticle * TopDecaySubset::findLastParticleInChain ( const reco::GenParticle *  p )

private

find W bosons that come from top quark decays and decay themselves (end of the MC chain) for Pythia6 this is identical to findPrimalW find the last particle in a (potentially) long chain of state transitions e.g. top[status==22]-> top[status==44 -> top[status==44] -> top[status==44] -> top[status==62] this function would pick the top with status 62

Definition at line 190 of file TopDecaySubset.cc.

References funct::abs(), reco::CompositeRefCandidateT< D >::daughter(), customizeTrackingMonitorSeedNumber::idx, kPythia, reco::CompositeRefCandidateT< D >::numberOfDaughters(), AlCaHLTBitMon_ParallelJobs::p, reco::Candidate::pdgId(), reco::LeafCandidate::pdgId(), showerModel_, and reco::LeafCandidate::status().

Referenced by fillListing().

                                  {
    int particleID = std::abs(p->pdgId());
    bool containsItself = false;
    unsigned int d_idx = 0;
    for (unsigned idx = 0; idx < p->numberOfDaughters(); ++idx) {
        if (std::abs(p->daughter(idx)->pdgId()) == particleID) {
            containsItself = true;
            d_idx = idx;
        }
    }

    if (!containsItself)
        return p;
    else {
    if (showerModel_ == kPythia){
      // Pythia6 has a weird idea of W bosons (and maybe other particles)
      // W (status == 3) -> q qbar' W. The new W is status 2 and has no daughters
      if(p->status() == 3)
        return p;
    }
    return findLastParticleInChain((reco::GenParticle*)p->daughter(d_idx));
  }


}

std::vector< const reco::GenParticle * > TopDecaySubset::findPrimalTops ( const reco::GenParticleCollection &  parts )

private

find primal top quarks (top quarks from the hard interaction) for Pythia6 this is identical to findDecayingTops

Definition at line 118 of file TopDecaySubset.cc.

References funct::abs(), customizeTrackingMonitorSeedNumber::idx, tree::t, and TopDecayID::tID.

Referenced by produce().

                                                {
    std::vector<const reco::GenParticle*> tops;
    for (reco::GenParticleCollection::const_iterator t = parts.begin();
            t != parts.end(); ++t) {
        if (std::abs(t->pdgId()) != TopDecayID::tID)
            continue;

        bool hasTopMother = false;
        for (unsigned idx = 0; idx < t->numberOfMothers(); ++idx) {
            if (std::abs(t->mother(idx)->pdgId()) == TopDecayID::tID)
                hasTopMother = true;
        }

        if (hasTopMother)  // not a primal top
            continue;
        tops.push_back(&(*t));
    }

    return tops;
}

const reco::GenParticle * TopDecaySubset::findPrimalW ( const reco::GenParticle *  top )

private

find W bosons that come from top quark decays for Pythia6 this is identical to findDecayingW

Definition at line 166 of file TopDecaySubset.cc.

References funct::abs(), reco::CompositeRefCandidateT< D >::daughter(), customizeTrackingMonitorSeedNumber::idx, reco::CompositeRefCandidateT< D >::numberOfDaughters(), reco::Candidate::pdgId(), and TopDecayID::WID.

                                    {
    unsigned int w_index = 0;
    for (unsigned idx = 0; idx < top->numberOfDaughters(); ++idx) {
        if (std::abs(top->daughter(idx)->pdgId()) == TopDecayID::WID) {
            w_index = idx;
            break;
        }
    }
    return (reco::GenParticle*)top->daughter(w_index);
}

std::vector< const reco::GenParticle * > TopDecaySubset::findTops ( const reco::GenParticleCollection &  parts )

private

find top quarks in list of input particles

Definition at line 106 of file TopDecaySubset.cc.

References funct::abs(), tree::t, TopDecayID::tID, and TopDecayID::unfrag.

Referenced by produce().

{
  std::vector<const reco::GenParticle*> tops;
  for(reco::GenParticleCollection::const_iterator t=parts.begin(); t!=parts.end(); ++t){
    if( std::abs(t->pdgId())==TopDecayID::tID && t->status()==TopDecayID::unfrag )
      tops.push_back( &(*t) );
  }
  return tops;
}

reco::Particle::LorentzVector TopDecaySubset::p4 ( const std::vector< const reco::GenParticle * >::const_iterator  top, int  statusFlag  )

private

calculate lorentz vector from input (dedicated to top reconstruction)

calculate lorentz vector from input

Definition at line 561 of file TopDecaySubset.cc.

References funct::abs(), AlCaHLTBitMon_ParallelJobs::p, TopDecayID::unfrag, and TopDecayID::WID.

Referenced by Tau.Tau::dxy_approx(), Tau.Tau::dz(), fillListing(), Jet.Jet::jetID(), and p4().

{
  // calculate the four vector for top/anti-top quarks from
  // the W boson and the b quark plain or including all
  // additional radiation depending on switch 'plain'
  if(statusFlag==TopDecayID::unfrag){
    // return 4 momentum as it is
    return (*top)->p4();
  }
  reco::Particle::LorentzVector vec;
  for(reco::GenParticle::const_iterator p=(*top)->begin(); p!=(*top)->end(); ++p){
    if( p->status() == TopDecayID::unfrag ){
      // descend by one level for each
      // status 3 particle on the way
      vec+=p4( p, statusFlag );
    }
    else{
      if( std::abs((*top)->pdgId())==TopDecayID::WID ){
    // in case of a W boson skip the status
    // 2 particle to prevent double counting
    if( std::abs(p->pdgId())!=TopDecayID::WID )
      vec+=p->p4();
      }
      else{
    // add all four vectors for each stable
    // particle (status 1 or 2) on the way
    vec+=p->p4();
    if( vec.mass()-(*top)->mass()>0 ){
      // continue adding up gluons and qqbar pairs on the top
      // line untill the nominal top mass is reached; then
      // break in order to prevent picking up virtualities
      break;
    }
      }
    }
  }
  return vec;
}

reco::Particle::LorentzVector TopDecaySubset::p4 ( const reco::GenParticle::const_iterator  part, int  statusFlag  )

private

calculate lorentz vector from input

calculate lorentz vector from input (dedicated to top reconstruction)

Definition at line 602 of file TopDecaySubset.cc.

References funct::abs(), reco::Candidate::begin(), reco::Candidate::end(), AlCaHLTBitMon_ParallelJobs::p, reco::Candidate::p4(), p4(), TopDecayID::stable, TopDecayID::unfrag, and TopDecayID::WID.

Referenced by Tau.Tau::dxy_approx(), Tau.Tau::dz(), and Jet.Jet::jetID().

{
  // calculate the four vector for all top daughters from
  // their daughters including additional radiation
  if(statusFlag==TopDecayID::unfrag){
    // return 4 momentum as it is
    return part->p4();
  }
  reco::Particle::LorentzVector vec;
  for(reco::GenParticle::const_iterator p=part->begin(); p!=part->end(); ++p){
    if( p->status()<=TopDecayID::stable && std::abs(p->pdgId ())==TopDecayID::WID){
      vec=p->p4();
    }
    else{
      if(p->status()<=TopDecayID::stable){
    // sum up the p4 of all stable particles
    // (of status 1 or 2)
    vec+=p->p4();
      }
      else{
    if( p->status()==TopDecayID::unfrag){
      // if the particle is unfragmented (i.e.
      // status 3) descend by one level
      vec+=p4(p, statusFlag);
    }
      }
    }
  }
  return vec;
}

void TopDecaySubset::produce ( edm::Event &  event, const edm::EventSetup &  setup  )

virtual

write output into the event

Implements edm::EDProducer.

Definition at line 48 of file TopDecaySubset.cc.

References checkShowerModel(), checkWBosons(), clearReferences(), fillListing(), fillReferences(), findDecayingTops(), findPrimalTops(), findTops(), kNone, kRun1, kRun2, kStart, runMode_, showerModel_, alcazmumu_cfi::src, srcToken_, and filterCSVwithJSON::target.

{
  // create target vector
  std::auto_ptr<reco::GenParticleCollection> target( new reco::GenParticleCollection );

  // get source collection
  edm::Handle<reco::GenParticleCollection> src;
  event.getByToken(srcToken_, src);

  // find out what generator we are dealing with
  if (showerModel_ == kStart && runMode_ == kRun2) {
    showerModel_ = checkShowerModel(event);
  }

  // find top quarks in list of input particles
  std::vector<const reco::GenParticle*> tops;
  if(runMode_ == kRun1)
      tops = findTops(*src);
  else
      tops = findPrimalTops(*src);

  // determine shower model (only in first event)
  if(showerModel_==kStart && runMode_ == kRun1)
    showerModel_=checkShowerModel(tops);

  if(showerModel_!=kNone) {
    // check sanity of W bosons
    if (runMode_ == kRun1)
        checkWBosons(tops);
    else {
        // nothing for the moment
    }

    // get ref product from the event
    const reco::GenParticleRefProd ref = event.getRefBeforePut<reco::GenParticleCollection>();
    // clear existing refs
    clearReferences();
    if (runMode_ == kRun1) {
        // fill output
        fillListing(tops, *target);
        // fill references
        fillReferences(ref, *target);
    }
    else {
        std::vector<const reco::GenParticle*> decaying_tops = findDecayingTops(*src);
        // fill output
        fillListing(tops, decaying_tops, *target);
        // fill references
        fillReferences(ref, *target);
    }
  }

  // write vectors to the event
  event.put(target);
}

Member Data Documentation

bool TopDecaySubset::addRadiation_

private

add radiation or not?

Definition at line 99 of file TopDecaySubset.h.

Referenced by fillListing().

FillMode TopDecaySubset::fillMode_

private

print the whole list of input particles or not? mode of decaySubset creation

Definition at line 102 of file TopDecaySubset.h.

Referenced by fillListing(), and TopDecaySubset().

edm::EDGetTokenT<GenEventInfoProduct> TopDecaySubset::genEventInfo_srcToken_

private

input tag for the genEventInfo source

Definition at line 97 of file TopDecaySubset.h.

Referenced by checkShowerModel().

int TopDecaySubset::motherPartIdx_

private

index in new evt listing of parts with daughters; has to be set to -1 in produce to deliver consistent results!

Definition at line 111 of file TopDecaySubset.h.

Referenced by clearReferences(), and fillListing().

std::map<int,std::vector<int> > TopDecaySubset::refs_

private

management of daughter indices for fillRefs

Definition at line 113 of file TopDecaySubset.h.

Referenced by addDaughters(), addRadiation(), clearReferences(), fillListing(), and fillReferences().

RunMode TopDecaySubset::runMode_

private

run mode (Run1 || Run2)

Definition at line 106 of file TopDecaySubset.h.

Referenced by produce(), and TopDecaySubset().

ShowerModel TopDecaySubset::showerModel_

private

parton shower mode (filled in checkShowerModel)

Definition at line 104 of file TopDecaySubset.h.

Referenced by checkWBosons(), fillListing(), findLastParticleInChain(), and produce().

edm::EDGetTokenT<reco::GenParticleCollection> TopDecaySubset::srcToken_

private

input tag for the genParticle source

Definition at line 95 of file TopDecaySubset.h.

Referenced by produce().