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// -*- C++ -*-
//
// Package: PythiaFilterTTBar
// Class: PythiaFilterTTBar
//
/**\class PythiaFilterTTBar PythiaFilterTTBar.cc GeneratorInterface/GenFilter/src/PythiaFilterTTBar.cc
Description: edmFilter to select a TTBar decay channel
Implementation:
decayType: 1 + leptonFlavour: 0 -> Semi-leptonic
leptonFlavour: 1 -> Semi-e
leptonFlavour: 2 -> Semi-mu
leptonFlavour: 3 -> Semi-tau
decayType: 2 -> di-leptonic (no seperate channels implemented yet)
decayType: 3 -> fully-hadronic
*/
//
// Original Author: Michael Maes
// Created: Wed Dec 3 12:07:13 CET 2009
//
//
#include "DataFormats/Common/interface/Handle.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/global/EDFilter.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/EDGetToken.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "SimDataFormats/GeneratorProducts/interface/HepMCProduct.h"
#include <cmath>
#include <cstdlib>
#include <string>
class PythiaFilterTTBar : public edm::global::EDFilter<> {
public:
explicit PythiaFilterTTBar(const edm::ParameterSet&);
bool filter(edm::StreamID, edm::Event&, const edm::EventSetup&) const override;
private:
const edm::EDGetTokenT<edm::HepMCProduct> token_;
const unsigned int decayType_;
const unsigned int leptonFlavour_;
};
PythiaFilterTTBar::PythiaFilterTTBar(const edm::ParameterSet& iConfig)
: token_(consumes<edm::HepMCProduct>(
edm::InputTag(iConfig.getUntrackedParameter("moduleLabel", std::string("generator")), "unsmeared"))),
decayType_(iConfig.getUntrackedParameter("decayType", 1)),
leptonFlavour_(iConfig.getUntrackedParameter("leptonFlavour", 0)) {}
bool PythiaFilterTTBar::filter(edm::StreamID, edm::Event& iEvent, const edm::EventSetup&) const {
bool accept = false;
edm::Handle<edm::HepMCProduct> evt;
iEvent.getByToken(token_, evt);
const HepMC::GenEvent* myGenEvent = evt->GetEvent();
unsigned int iE = 0, iMu = 0, iTau = 0;
unsigned int iNuE = 0, iNuMu = 0, iNuTau = 0;
unsigned int iLep = 0, iNu = 0;
for (HepMC::GenEvent::particle_const_iterator p = myGenEvent->particles_begin(); p != myGenEvent->particles_end();
++p) {
int pdgID = (*p)->pdg_id();
int status = (*p)->status();
if (status == 3) {
// count the final state leptons
if (std::abs(pdgID) == 11)
iE++;
if (std::abs(pdgID) == 13)
iMu++;
if (std::abs(pdgID) == 15)
iTau++;
// count the final state neutrinos
if (std::abs(pdgID) == 12)
iNuE++;
if (std::abs(pdgID) == 14)
iNuMu++;
if (std::abs(pdgID) == 16)
iNuTau++;
}
}
iLep = (iE + iMu + iTau);
iNu = (iNuE + iNuMu + iNuTau);
if (decayType_ == 1) { // semi-leptonic decay
// l = e,mu,tau
if (leptonFlavour_ == 0 && iLep == 1 && iNu == 1)
accept = true;
// l = e
else if (leptonFlavour_ == 1 && iE == 1 && iNuE == 1 && iLep == 1 && iNu == 1)
accept = true;
// l = mu
else if (leptonFlavour_ == 2 && iMu == 1 && iNuMu == 1 && iLep == 1 && iNu == 1)
accept = true;
// l = tau
else if (leptonFlavour_ == 3 && iTau == 1 && iNuTau == 1 && iLep == 1 && iNu == 1)
accept = true;
}
else if (decayType_ == 2) { // di-leptonic decay (inclusive)
if (iLep == 2 && iNu == 2)
accept = true;
}
else if (decayType_ == 3) { // fully-hadronic decay
if (iLep == 0 && iNu == 0)
accept = true;
}
else
accept = false;
return accept;
}
DEFINE_FWK_MODULE(PythiaFilterTTBar);
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