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// -*- C++ -*-
//
// Package: LHEVpTFilter
// Class: LHEVpTFilter
//
/*
Description: Filter to select events with V pT in a given range.
(Based on LHEGenericFilter)
*/
//
#include "DataFormats/Common/interface/Handle.h"
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/global/EDFilter.h"
#include "FWCore/Framework/interface/Event.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 "Math/Vector4D.h"
#include "Math/Vector4Dfwd.h"
#include "SimDataFormats/GeneratorProducts/interface/LHEEventProduct.h"
#include <cmath>
#include <cstdlib>
#include <vector>
//
// class declaration
//
class LHEVpTFilter : public edm::global::EDFilter<> {
public:
explicit LHEVpTFilter(const edm::ParameterSet&);
private:
bool filter(edm::StreamID, edm::Event&, const edm::EventSetup&) const override;
// ----------member data ---------------------------
const edm::EDGetTokenT<LHEEventProduct> src_;
const double vptMin_; // number of particles required to pass filter
const double vptMax_; // number of particles required to pass filter
};
LHEVpTFilter::LHEVpTFilter(const edm::ParameterSet& iConfig)
: src_(consumes<LHEEventProduct>(iConfig.getParameter<edm::InputTag>("src"))),
vptMin_(iConfig.getParameter<double>("VpTMin")),
vptMax_(iConfig.getParameter<double>("VpTMax")) {}
// ------------ method called to skim the data ------------
bool LHEVpTFilter::filter(edm::StreamID, edm::Event& iEvent, const edm::EventSetup&) const {
edm::Handle<LHEEventProduct> EvtHandle;
iEvent.getByToken(src_, EvtHandle);
std::vector<lhef::HEPEUP::FiveVector> const& lheParticles = EvtHandle->hepeup().PUP;
std::vector<ROOT::Math::PxPyPzEVector> lepCands;
for (unsigned int i = 0; i < lheParticles.size(); ++i) {
if (EvtHandle->hepeup().ISTUP[i] != 1) { // keep only outgoing particles
continue;
}
unsigned absPdgId = std::abs(EvtHandle->hepeup().IDUP[i]);
if (absPdgId >= 11 && absPdgId <= 16) {
lepCands.push_back(
ROOT::Math::PxPyPzEVector(lheParticles[i][0], lheParticles[i][1], lheParticles[i][2], lheParticles[i][3]));
}
}
double vpt_ = -1;
if (lepCands.size() == 2) {
vpt_ = (lepCands[0] + lepCands[1]).pt();
}
if (vpt_ < vptMax_ && vpt_ >= vptMin_) {
return true;
} else {
return false;
}
}
//define this as a plug-in
DEFINE_FWK_MODULE(LHEVpTFilter);
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