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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Projections/WFinder.hh"
#include "Rivet/Projections/ZFinder.hh"
#include "fastjet/tools/Filter.hh"
#include "fastjet/tools/Pruner.hh"
#include "Rivet/Tools/AtlasCommon.hh"
namespace Rivet {
class MC_JET_IN_HI : public Analysis {
public:
/// @name Constructors etc.
//@{
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(MC_JET_IN_HI);
//@}
public:
string ts(int in) {
std::stringstream ss;
ss << in;
return ss.str();
}
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Declare centrality projection - we use the ATLAS PbPb definition
// to be able to compare to data.
declareCentrality(ATLAS::SumET_PBPB_Centrality(),"ATLAS_PBPB_CENTRALITY",
"sumETFwd","sumETFwd");
// The final state where jets are found
FinalState fs(Cuts::abseta < 2.5);
declare(fs, "FS");
ZFinder zfinder(fs, Cuts::abseta < 2.5 && Cuts::pT > 30*GeV, PID::MUON, 80*GeV, 100*GeV, 0.2,
ZFinder::ChargedLeptons::PROMPT, ZFinder::ClusterPhotons::NODECAY, ZFinder::AddPhotons::YES);
declare(zfinder, "ZFinder");
// Z+jet jet collections
declare(FastJets(zfinder.remainingFinalState(), FastJets::ANTIKT, 0.3), "JetsAK3");
declare(FastJets(zfinder.remainingFinalState(), FastJets::ANTIKT, 0.5), "JetsAK5");
declare(FastJets(zfinder.remainingFinalState(), FastJets::ANTIKT, 0.7), "JetsAK7");
declare(FastJets(zfinder.remainingFinalState(), FastJets::ANTIKT, 0.9), "JetsAK9");
jetFinders = {"JetsAK3", "JetsAK5", "JetsAK7", "JetsAK9"};
h_zpT.resize(jetFinders.size());
h_jetpT.resize(jetFinders.size());
for (size_t i = 0; i < jetFinders.size(); ++i) {
string s = jetFinders[i];
book(h_zpT[i], s + "zpT",logspace(50, 1.0,1000));
book(h_jetpT[i], s + "jetpT",logspace(50, 1.0,1000));
}
book(incSow, "incSow");
centData = {0., 0.2, 0.4, 0.6, 0.8,};
for (size_t i = 0; i < centData.size(); ++i) {
book(c_jetpT[centData[i]], "cjetpT" + ts(i),logspace(100, 10.0,1000));
book(c_zpT[centData[i]], "czpt" + ts(i),logspace(100, 10.0,1000));
book(sow[centData[i]], "sow_" + ts(i));
}
}
bool isBackToBack_zj(const ZFinder& zf, const fastjet::PseudoJet& psjet) {
const FourMomentum& z = zf.bosons()[0].momentum();
const FourMomentum jmom(psjet.e(), psjet.px(), psjet.py(), psjet.pz());
return (deltaPhi(z, jmom) > 7.*M_PI/8. );
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// Get the Z
const ZFinder& zfinder = apply<ZFinder>(event, "ZFinder");
if (zfinder.bosons().size() != 1) vetoEvent;
Particle z = zfinder.bosons()[0];
Particle l1 = zfinder.constituents()[0];
Particle l2 = zfinder.constituents()[1];
// Require a high-pT Z (and constituents)
if (l1.pT() < 10*GeV || l2.pT() < 10*GeV || z.pT() < 60*GeV) vetoEvent;
// Get the centrality
const double c = apply<CentralityProjection>(event,"sumETFwd")();
auto jetpTItr = c_jetpT.upper_bound(c);
auto zpTItr = c_zpT.upper_bound(c);
auto sowItr = sow.upper_bound(c);
if (jetpTItr == c_jetpT.end() || zpTItr == c_zpT.end() ||
sowItr == sow.end()) vetoEvent;
sowItr->second->fill();
incSow->fill();
// Get the jets
for (size_t i = 0; i < jetFinders.size(); ++i ) {
const PseudoJets& psjets = apply<FastJets>(event,
jetFinders[i]).pseudoJetsByPt(30.0*GeV);
if (!psjets.empty()) {
// Get the leading jet and make sure it's back-to-back with the Z
const fastjet::PseudoJet& j0 = psjets[0];
if (isBackToBack_zj(zfinder, j0)) {
// Fill the centrality inclusive histograms
h_zpT[i]->fill(z.pT());
h_jetpT[i]->fill(j0.perp());
// Fill centrality dept histograms only for R = 0.3
if (i == 0) {
jetpTItr->second->fill(j0.perp());
zpTItr->second->fill(z.pT());
}
}
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(size_t i = 0; i < jetFinders.size(); ++i) {
h_zpT[i]->scaleW(1./incSow->sumW());
h_jetpT[i]->scaleW(1./incSow->sumW());
}
for (size_t i = 0; i < centData.size(); ++i) {
c_jetpT[centData[i]]->scaleW(1./sow[centData[i]]->sumW());
c_zpT[centData[i]]->scaleW(1./sow[centData[i]]->sumW());
}
}
//@}
private:
vector<string> jetFinders;
// Centrality inclusive histograms
vector<Histo1DPtr> h_zpT;
vector<Histo1DPtr> h_jetpT;
CounterPtr incSow;
// Centrality intervals
vector<double> centData;
// Centrality binned histograms
map<double, Histo1DPtr> c_jetpT;
map<double, Histo1DPtr> c_zpT;
map<double, CounterPtr> sow;
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(MC_JET_IN_HI);
}
|