HGCalTriggerNtupleGenTau.cc

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#include <vector>
#include "DataFormats/Math/interface/LorentzVector.h"
#include "DataFormats/HepMCCandidate/interface/GenParticle.h"
#include "L1Trigger/L1THGCal/interface/HGCalTriggerNtupleBase.h"
#include "DataFormats/Math/interface/LorentzVector.h"

typedef math::XYZTLorentzVector LorentzVector;

class HGCalTriggerNtupleGenTau : public HGCalTriggerNtupleBase
{

    public:
        HGCalTriggerNtupleGenTau(const edm::ParameterSet& );

        virtual void initialize(TTree&, const edm::ParameterSet&, edm::ConsumesCollector&&) override final;
        virtual void fill(const edm::Event&, const edm::EventSetup& ) override final;
    
    private:
        virtual void clear() override final;

        bool isGoodTau( const reco::GenParticle& candidate ) const;
        bool isStableLepton( const reco::GenParticle & daughter ) const;
        bool isElectron( const reco::GenParticle & daughter ) const;
        bool isMuon( const reco::GenParticle & daughter ) const;
        bool isChargedPion( const reco::GenParticle & daughter ) const;
        bool isNeutralPion( const reco::GenParticle & daughter ) const;
        bool isIntermediateResonance( const reco::GenParticle & daughter ) const;
        bool isGamma( const reco::GenParticle & daughter ) const;

        edm::EDGetToken gen_token_;
        bool isPythia8generator_;

        std::vector<float> gentau_pt_;
        std::vector<float> gentau_eta_;
        std::vector<float> gentau_phi_;
        std::vector<float> gentau_energy_;
        std::vector<float> gentau_mass_;

        std::vector<float> gentau_vis_pt_;
        std::vector<float> gentau_vis_eta_;
        std::vector<float> gentau_vis_phi_;
        std::vector<float> gentau_vis_energy_;
        std::vector<float> gentau_vis_mass_;    
        std::vector<int> gentau_decayMode_;
        std::vector<int> gentau_totNproducts_;
        std::vector<int> gentau_totNgamma_;
        std::vector<int> gentau_totNcharged_;

        std::vector<std::vector<float> > gentau_products_pt_;
        std::vector<std::vector<float> > gentau_products_eta_;
        std::vector<std::vector<float> > gentau_products_phi_;
        std::vector<std::vector<float> > gentau_products_energy_;
        std::vector<std::vector<float> > gentau_products_mass_;
        std::vector<std::vector< int > > gentau_products_id_;
        
};

DEFINE_EDM_PLUGIN(HGCalTriggerNtupleFactory,
        HGCalTriggerNtupleGenTau,
        "HGCalTriggerNtupleGenTau" );


HGCalTriggerNtupleGenTau::
HGCalTriggerNtupleGenTau(const edm::ParameterSet& conf):HGCalTriggerNtupleBase(conf)
{
}

void
HGCalTriggerNtupleGenTau::
initialize(TTree& tree, const edm::ParameterSet& conf, edm::ConsumesCollector&& collector)
{

    gen_token_ = collector.consumes<reco::GenParticleCollection>(conf.getParameter<edm::InputTag>("GenParticles"));
    isPythia8generator_ = conf.getParameter<bool>("isPythia8");

    tree.Branch("gentau_pt", &gentau_pt_);
    tree.Branch("gentau_eta", &gentau_eta_);
    tree.Branch("gentau_phi", &gentau_phi_);
    tree.Branch("gentau_energy", &gentau_energy_);
    tree.Branch("gentau_mass", &gentau_mass_);
    tree.Branch("gentau_vis_pt", &gentau_vis_pt_);
    tree.Branch("gentau_vis_eta", &gentau_vis_eta_);
    tree.Branch("gentau_vis_phi", &gentau_vis_phi_);
    tree.Branch("gentau_vis_energy", &gentau_vis_energy_);
    tree.Branch("gentau_vis_mass", &gentau_vis_mass_);
    tree.Branch("gentau_products_pt", &gentau_products_pt_);
    tree.Branch("gentau_products_eta", &gentau_products_eta_);
    tree.Branch("gentau_products_phi", &gentau_products_phi_);
    tree.Branch("gentau_products_energy", &gentau_products_energy_);
    tree.Branch("gentau_products_mass", &gentau_products_mass_);
    tree.Branch("gentau_products_id", &gentau_products_id_);
    tree.Branch("gentau_decayMode", &gentau_decayMode_);
    tree.Branch("gentau_totNproducts", &gentau_totNproducts_);
    tree.Branch("gentau_totNgamma", &gentau_totNgamma_);
    tree.Branch("gentau_totNcharged", &gentau_totNcharged_);

}

bool HGCalTriggerNtupleGenTau::isGoodTau( const reco::GenParticle& candidate ) const {
    return ( std::abs( candidate.pdgId() ) == 15 && candidate.status() == 2 );    
}


bool HGCalTriggerNtupleGenTau::isChargedPion( const reco::GenParticle& candidate ) const {
    return ( std::abs(candidate.pdgId()) == 211 && candidate.status()==1 
             && candidate.isDirectPromptTauDecayProductFinalState() && candidate.isLastCopy() );
}


bool HGCalTriggerNtupleGenTau::isStableLepton( const reco::GenParticle& candidate ) const
{
    return ( (std::abs(candidate.pdgId()) == 11 || std::abs(candidate.pdgId()) == 13) && candidate.status()==1 
             && candidate.isDirectPromptTauDecayProductFinalState() && candidate.isLastCopy() );
}


bool HGCalTriggerNtupleGenTau::isElectron( const reco::GenParticle& candidate ) const
{
    return ( std::abs(candidate.pdgId()) == 11 && candidate.isDirectPromptTauDecayProductFinalState() && candidate.isLastCopy() );
}


bool HGCalTriggerNtupleGenTau::isMuon( const reco::GenParticle& candidate ) const
{
    return ( std::abs(candidate.pdgId()) == 13 && candidate.isDirectPromptTauDecayProductFinalState() && candidate.isLastCopy() );
}


bool HGCalTriggerNtupleGenTau::isNeutralPion( const reco::GenParticle& candidate ) const
{
    return ( std::abs(candidate.pdgId()) == 111 && candidate.status()==2 && candidate.statusFlags().isTauDecayProduct()
             && !candidate.isDirectPromptTauDecayProductFinalState() );
}


bool HGCalTriggerNtupleGenTau::isGamma( const reco::GenParticle& candidate ) const
{
    return ( std::abs(candidate.pdgId()) == 22 && candidate.status()==1 && candidate.statusFlags().isTauDecayProduct() 
             && !candidate.isDirectPromptTauDecayProductFinalState() && candidate.isLastCopy() );
}


bool HGCalTriggerNtupleGenTau::isIntermediateResonance( const reco::GenParticle& candidate ) const
{
    return ( ( std::abs(candidate.pdgId()) == 213 || std::abs(candidate.pdgId()) == 20213 || std::abs(candidate.pdgId()) == 24 )
             && candidate.isDirectPromptTauDecayProductFinalState() && candidate.status() == 2 );
}


void
HGCalTriggerNtupleGenTau::
fill(const edm::Event& e, const edm::EventSetup& es)
{
    edm::Handle<reco::GenParticleCollection> gen_particles_h;
    e.getByToken(gen_token_, gen_particles_h);
    const reco::GenParticleCollection& gen_particles = *gen_particles_h;

    clear();
    
    for(const auto& particle : gen_particles)
    {
        
        /* select good taus */
        if( isGoodTau( particle ) ){

            LorentzVector tau_p4vis(0.,0.,0.,0.);
            gentau_pt_.emplace_back( particle.pt() );
            gentau_eta_.emplace_back( particle.eta() );
            gentau_phi_.emplace_back( particle.phi() );
            gentau_energy_.emplace_back( particle.energy() );
            gentau_mass_.emplace_back( particle.mass() );

            int n_pi=0;
            int n_piZero=0;
            int n_gamma=0;
            int n_ele=0;
            int n_mu=0;

            std::vector<float> tau_products_pt;
            std::vector<float> tau_products_eta;
            std::vector<float> tau_products_phi;
            std::vector<float> tau_products_energy;
            std::vector<float> tau_products_mass;
            std::vector< int > tau_products_id;
            
            /* loop over tau daughters */
            const reco::GenParticleRefVector& daughters = particle.daughterRefVector();
                
            for( const auto& daughter : daughters ){

                reco::GenParticleRefVector finalProds;

                if( isStableLepton( *daughter ) ){
                    if( isElectron( *daughter ) ){
                        n_ele++;
                    }
                    else if( isMuon( *daughter ) ){
                        n_mu++;
                    }
                    tau_p4vis+=(daughter->p4());
                    finalProds.push_back( daughter );
                }        

                if( isChargedPion( *daughter ) ){
                    n_pi++;
                    tau_p4vis+=(daughter->p4());
                    finalProds.push_back( daughter );
                }                

                if( isNeutralPion( *daughter ) ){
                    n_piZero++;
                    const reco::GenParticleRefVector& grandaughters = daughter->daughterRefVector();
                    for( const auto& grandaughter : grandaughters ){
                        if( isGamma( *grandaughter ) ){
                            n_gamma++;
                            tau_p4vis+=(grandaughter->p4());         
                            finalProds.push_back( daughter );
                        }
                    }
                }
                                
                /* Here the selection of the decay product according to the Pythia6 decayTree */                
                if( !isPythia8generator_ ){            
                    if( isIntermediateResonance( *daughter ) ){
                        const reco::GenParticleRefVector& grandaughters = daughter->daughterRefVector();
                        for( const auto& grandaughter : grandaughters ){
                            if( isChargedPion( *grandaughter ) ){
                                n_pi++;
                                tau_p4vis+=(grandaughter->p4());         
                                finalProds.push_back( daughter );
                            }                            
                            if( isNeutralPion( *grandaughter ) ){
                                n_piZero++;
                                const reco::GenParticleRefVector& descendants = grandaughter->daughterRefVector();
                                for( const auto& descendant : descendants ){
                                    if( isGamma( *descendant ) ){
                                        n_gamma++;
                                        tau_p4vis+=(descendant->p4());         
                                        finalProds.push_back( daughter );
                                    }
                                }
                            }                            
                        }
                    }
                }

                /* Fill daughter informations */
                for( const auto& prod : finalProds ){  
                    tau_products_pt.emplace_back( prod->pt() );
                    tau_products_eta.emplace_back( prod->eta() );
                    tau_products_phi.emplace_back( prod->phi() );
                    tau_products_energy.emplace_back( prod->energy() );
                    tau_products_mass.emplace_back( prod->mass() );                                    
                    tau_products_id.emplace_back( prod->pdgId() );
                }
                
            } 
           
            /* assign the tau-variables */
            gentau_vis_pt_.emplace_back(tau_p4vis.Pt());
            gentau_vis_eta_.emplace_back(tau_p4vis.Eta());
            gentau_vis_phi_.emplace_back(tau_p4vis.Phi());
            gentau_vis_energy_.emplace_back(tau_p4vis.E());
            gentau_vis_mass_.emplace_back(tau_p4vis.M());
            gentau_totNproducts_.emplace_back(n_pi + n_gamma);
            gentau_totNgamma_.emplace_back(n_gamma);
            gentau_totNcharged_.emplace_back(n_pi);
   
            gentau_products_pt_.emplace_back(tau_products_pt);
            gentau_products_eta_.emplace_back(tau_products_eta);
            gentau_products_phi_.emplace_back(tau_products_phi);
            gentau_products_energy_.emplace_back(tau_products_energy);
            gentau_products_mass_.emplace_back(tau_products_mass);
            gentau_products_id_.emplace_back(tau_products_id);

            /* leptonic tau decays */
            if( n_pi == 0 && n_piZero == 0 && n_ele==1 ){ gentau_decayMode_.emplace_back(11); }
            else if( n_pi == 0 && n_piZero == 0 && n_mu==1 ){ gentau_decayMode_.emplace_back(13); }
            /* 1-prong */
            else if( n_pi == 1 && n_piZero == 0 ){ gentau_decayMode_.emplace_back(0); }
            /* 1-prong + pi0s */            
            else if( n_pi == 1 && n_piZero >= 1 ){ gentau_decayMode_.emplace_back(1); }
            /* 3-prongs */
            else if( n_pi == 3 && n_piZero == 0 ){ gentau_decayMode_.emplace_back(4); }
            /* 3-prongs + pi0s */
            else if( n_pi == 3 && n_piZero >= 1 ){ gentau_decayMode_.emplace_back(5); }
            /* other decays */
            else{ gentau_decayMode_.emplace_back(-1); } 

        }
    }

}


void
HGCalTriggerNtupleGenTau::
clear()
{
    gentau_pt_.clear();
    gentau_eta_.clear();
    gentau_phi_.clear();
    gentau_energy_.clear();
    gentau_mass_.clear();
    gentau_decayMode_.clear();
    gentau_vis_pt_.clear();
    gentau_vis_eta_.clear();
    gentau_vis_phi_.clear();
    gentau_vis_energy_.clear();
    gentau_vis_mass_.clear();
    gentau_totNproducts_.clear();
    gentau_totNgamma_.clear();
    gentau_totNcharged_.clear();
    gentau_products_pt_.clear();
    gentau_products_eta_.clear();
    gentau_products_phi_.clear();
    gentau_products_energy_.clear();
    gentau_products_mass_.clear();
    gentau_products_id_.clear();
}