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// -*- C++ -*-
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//
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// Package: MuonMCClassifier
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// Class: MuonMCClassifier
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//
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/**\class MuonMCClassifier MuonMCClassifier.cc PhysicsTools/PatAlgos/src/MuonMCClassifier.cc
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Description: <one line class summary>
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Implementation:
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<Notes on implementation>
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*/
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//
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// Original Author: Nov 16 16:12 (lxplus231.cern.ch)
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// Created: Sun Nov 16 16:14:09 CET 2008
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// $Id: MuonMCClassifier.cc,v 1.1 2009/04/14 13:58:52 gpetrucc Exp $
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//
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//
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// system include files
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#include <memory>
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#include <set>
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#include <ext/hash_map>
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// user include files
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#include "FWCore/Framework/interface/Frameworkfwd.h"
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#include "FWCore/Framework/interface/EDProducer.h"
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#include "FWCore/Framework/interface/Event.h"
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#include "FWCore/Framework/interface/MakerMacros.h"
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#include "FWCore/ParameterSet/interface/ParameterSet.h"
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#include "DataFormats/Common/interface/Association.h"
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#include "DataFormats/Common/interface/View.h"
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#include "DataFormats/Common/interface/RefProd.h"
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#include "DataFormats/Math/interface/deltaR.h"
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#include "DataFormats/Candidate/interface/CandidateFwd.h"
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#include "DataFormats/Candidate/interface/Candidate.h"
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#include "DataFormats/HepMCCandidate/interface/GenParticleFwd.h"
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#include "DataFormats/HepMCCandidate/interface/GenParticle.h"
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//
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// class decleration
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class MuonMCClassifier : public edm::EDProducer {
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public:
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explicit MuonMCClassifier(const edm::ParameterSet&);
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~MuonMCClassifier();
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private:
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virtual void produce(edm::Event&, const edm::EventSetup&);
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/// Returns the flavour given a pdg id code
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int flavour(int pdgId) const ;
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/// Return the flavour of the first and of the heaviest ancestors of a given particle
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std::pair<int,int> flavours(const reco::GenParticleRef & mc) const ;
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/// Write a ValueMap<int> in the event
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void writeValueMap(edm::Event &iEvent,
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const edm::Handle<edm::View<reco::Candidate> > & handle,
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const std::vector<int> & values,
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const std::string & label) const ;
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/// The RECO objects
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edm::InputTag src_;
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/// The GenParticle objects
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edm::InputTag mc_;
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/// The Associations
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edm::InputTag assoHardByDr_, assoByDr_, assoByPulls_, assoInFlight_;
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};
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MuonMCClassifier::MuonMCClassifier(const edm::ParameterSet &iConfig) :
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src_(iConfig.getParameter<edm::InputTag>("src")),
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mc_(iConfig.getParameter<edm::InputTag>("mc")),
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assoHardByDr_(iConfig.getParameter<edm::InputTag>("assoHardByDr")),
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assoByDr_(iConfig.getParameter<edm::InputTag>("assoByDr")),
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assoByPulls_(iConfig.getParameter<edm::InputTag>("assoByPulls")),
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assoInFlight_(iConfig.getParameter<edm::InputTag>("assoInFlight"))
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{
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produces<edm::ValueMap<int> >("origin");
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produces<edm::ValueMap<int> >("recoStatus");
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produces<edm::ValueMap<int> >("flavourFirst");
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produces<edm::ValueMap<int> >("flavourHeaviest");
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}
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MuonMCClassifier::~MuonMCClassifier()
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{
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}
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void
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MuonMCClassifier::produce(edm::Event& iEvent, const edm::EventSetup& iSetup)
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{
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edm::Handle<edm::View<reco::Candidate> > src;
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iEvent.getByLabel(src_, src);
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typedef std::vector<reco::GenParticle> MCColl;
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edm::Handle<MCColl> mc;
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iEvent.getByLabel(mc_, mc);
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typedef edm::Association<MCColl> MCAssoc;
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edm::Handle<MCAssoc> assoHardByDr, assoByDr, assoByPulls, assoInFlight;
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iEvent.getByLabel(assoHardByDr_, assoHardByDr);
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iEvent.getByLabel(assoByDr_, assoByDr);
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iEvent.getByLabel(assoByPulls_, assoByPulls);
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iEvent.getByLabel(assoInFlight_, assoInFlight);
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std::vector<int> origin(src->size(), 0);
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std::vector<int> reco( src->size(), 0);
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std::vector<int> flavF( src->size(), 0);
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std::vector<int> flavH( src->size(), 0);
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for (size_t i = 0, n = src->size(); i < n; ++i) {
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reco::CandidatePtr ptr = src->ptrAt(i);
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reco::GenParticleRef mcHardByDr = (*assoHardByDr)[ptr];
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reco::GenParticleRef mcByDr = (*assoByDr)[ptr];
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reco::GenParticleRef mcByPulls = (*assoByPulls)[ptr];
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reco::GenParticleRef mcInFlight = (*assoInFlight)[ptr];
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if (mcHardByDr.isNonnull()) {
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origin[i] = 1; // hard scattering muon
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// std::cout << "Muon with pt " << ptr->pt() << " comes from hard scattering.\n";
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flavF[i] = flavH[i] = 13;
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} else if (mcByDr.isNonnull()) {
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origin[i] = 2; // other generator-level decay muon
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std::pair<int,int> flavs = flavours(mcByDr);
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flavF[i] = flavs.first;
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flavH[i] = flavs.second;
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// std::cout << "Muon with pt " << ptr->pt() << " comes from primary source: flavour " << flavs.first << ", heaviest " << flavs.second << ".\n";
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} else if (mcInFlight.isNonnull()) {
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origin[i] = 3;
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std::pair<int,int> flavs = flavours(mcInFlight);
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flavF[i] = flavs.first;
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flavH[i] = flavs.second;
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// std::cout << "Muon with pt " << ptr->pt() << " is from in-flight decay only: flavour " << flavs.first << ", heaviest " << flavs.second << ".\n";
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} else {
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// std::cout << "Muon with pt " << ptr->pt() << " has undefined (non muonic) origin.\n";
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}
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switch (origin[i]) {
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case 1:
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case 2:
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// bit 0 if TK reconstructed well some track
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// bit 1 if TK reconstructed well the primary muon
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// bit 2 if STA reconstructed the primary muon
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reco[i] = mcByPulls.isNonnull() + 2*(mcByPulls == mcByDr) + 4*(mcInFlight == mcByDr);
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break;
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case 3:
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// bit 0 if TK reconstructed well some track
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// bit 1 if TK reconstructed well the primary muon or one of its ancestors
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// bit 2 if STA reconstructed well the primary muon
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reco[i] = mcByPulls.isNonnull() + 4*(mcByPulls == mcInFlight);
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if (mcByPulls.isNonnull()) {
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for(reco::GenParticleRef ref = mcInFlight; ref.isNonnull(); ref = ref->motherRef()) {
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if (ref == mcByPulls) { reco[i] += 2; break; }
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if (ref->motherRefVector().empty()) break;
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}
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}
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break;
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default:
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// bit 0 if TK reconstructed well some track
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reco[i] = mcByPulls.isNonnull();
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};
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// std::cout << " TK track matched by pulls? " << (reco[i] & 0x1 ? "Y" : "N") << std::endl;
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// std::cout << " TK track matched correctly? " << (reco[i] & 0x2 ? "Y" : "N") << std::endl;
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// std::cout << " ST track matched correctly? " << (reco[i] & 0x4 ? "Y" : "N") << std::endl;
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}
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writeValueMap(iEvent, src, origin, "origin");
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writeValueMap(iEvent, src, reco, "recoStatus");
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writeValueMap(iEvent, src, flavF, "flavourFirst");
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writeValueMap(iEvent, src, flavH, "flavourHeaviest");
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}
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int
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MuonMCClassifier::flavour(int pdgId) const {
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int flav = abs(pdgId);
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// muons and taus have themselves as flavour
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if (flav == 13 || flav == 15) return flav;
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// for quarks it's easy
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if (flav <= 5) return flav;
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// look for barions
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int bflav = ((flav / 1000) % 10);
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if (bflav != 0) return bflav;
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// look for mesons
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int mflav = ((flav / 100) % 10);
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if (mflav != 0) return mflav;
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return 0;
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}
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std::pair<int,int>
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MuonMCClassifier::flavours(const reco::GenParticleRef & ref) const
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{
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if (ref.isNull()) return std::make_pair(0,0);
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std::vector<reco::GenParticleRef> work;
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work.insert(work.end(), ref->motherRefVector().begin(), ref->motherRefVector().end());
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int first = -1, heaviest = 0;
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while (!work.empty()) {
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reco::GenParticleRef r = work.back(); work.pop_back();
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int flav = flavour(r->pdgId());
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if ((first == -1) && (flav != 0)) { first = flav; }
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if (flav == 13 || flav == 15) {
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if (r->status() == 3) {
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heaviest = flav; // hard-scattering muon or tau
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break;
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} else {
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flav = 0; // otherwise don't pollute the "heaviest" match
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}
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}
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if (flav > heaviest) heaviest = flav;
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work.insert(work.end(), r->motherRefVector().begin(), r->motherRefVector().end());
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}
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return std::make_pair(first,heaviest);
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}
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void
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MuonMCClassifier::writeValueMap(edm::Event &iEvent,
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const edm::Handle<edm::View<reco::Candidate> > & handle,
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const std::vector<int> & values,
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const std::string & label) const
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{
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using namespace edm;
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using namespace std;
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auto_ptr<ValueMap<int> > valMap(new ValueMap<int>());
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edm::ValueMap<int>::Filler filler(*valMap);
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filler.insert(handle, values.begin(), values.end());
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filler.fill();
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iEvent.put(valMap, label);
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}
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//define this as a plug-in
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DEFINE_FWK_MODULE(MuonMCClassifier);
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