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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/ZFinder.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Projections/VetoedFinalState.hh"
namespace Rivet {
/// Z + jets in pp at 13 TeV
class ATLAS_2017_I1514251 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ATLAS_2017_I1514251);
/// Book histograms and initialise projections before the run
void init() {
// Get options from the new option system
// default to combined.
_mode = 2;
if ( getOption("LMODE") == "EL" ) _mode = 0;
if ( getOption("LMODE") == "MU" ) _mode = 1;
if ( getOption("LMODE") == "EMU" ) _mode = 2;
const FinalState fs;
Cut cuts = (Cuts::pT > 25*GeV) && (Cuts::abseta < 2.5);
ZFinder zeefinder(fs, cuts, PID::ELECTRON, 71*GeV, 111*GeV);
ZFinder zmumufinder(fs, cuts, PID::MUON, 71*GeV, 111*GeV);
declare(zeefinder, "zeefinder");
declare(zmumufinder, "zmumufinder");
// Define veto FS in order to prevent Z-decay products entering the jet algorithm
VetoedFinalState had_fs;
had_fs.addVetoOnThisFinalState(zeefinder);
had_fs.addVetoOnThisFinalState(zmumufinder);
FastJets jets(had_fs, FastJets::ANTIKT, 0.4, JetAlg::Muons::ALL, JetAlg::Invisibles::DECAY);
declare(jets, "jets");
// individual channels
book(_h_Njets_excl, _mode + 1, 1, 1);
book(_h_Njets, _mode + 4, 1, 1);
book(_h_Njets_Ratio, _mode + 7, 1, 1, true);
book(_h_leading_jet_pT_eq1jet, _mode + 10, 1, 1);
book(_h_leading_jet_pT , _mode + 13, 1, 1);
book(_h_leading_jet_pT_2jet , _mode + 16, 1, 1);
book(_h_leading_jet_pT_3jet , _mode + 19, 1, 1);
book(_h_leading_jet_pT_4jet , _mode + 22, 1, 1);
book(_h_leading_jet_rap , _mode + 25, 1, 1);
book(_h_HT , _mode + 28, 1, 1);
book(_h_jet_dphi , _mode + 31, 1, 1);
book(_h_jet_mass , _mode + 34, 1, 1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const ZFinder& zeefinder = apply<ZFinder>(event, "zeefinder");
const ZFinder& zmumufinder = apply<ZFinder>(event, "zmumufinder");
const Particles& zees = zeefinder.bosons();
const Particles& zmumus = zmumufinder.bosons();
//Veto Z->mumu in electron mode, and vice versa:
if (_mode==0 && (zees.size()!=1 || zmumus.size() ) ) vetoEvent;
if (_mode==1 && (zees.size() || zmumus.size()!=1 ) ) vetoEvent;
if (zees.size() + zmumus.size() != 1) {
// Running in combined mode, we did not find exactly one Z. Not good.
MSG_DEBUG("Did not find exactly one good Z candidate");
vetoEvent;
}
// Find the (dressed!) leptons
const Particles& leptons = zees.size() ? zeefinder.constituents() : zmumufinder.constituents();
if (leptons.size() != 2) vetoEvent;
Jets jets = apply<JetAlg>(event, "jets").jetsByPt(Cuts::pT > 30*GeV && Cuts::absrap < 2.5);
bool veto = false;
for(const Jet& j : jets) {
for(const Particle& l : leptons) { veto |= deltaR(j, l) < 0.4; }
}
if (veto) vetoEvent;
double HT=0;
for(const Particle& l : leptons) { HT += l.pT(); }
const size_t Njets = jets.size();
_h_Njets_excl->fill(Njets);
for(size_t i = 0; i <= Njets; ++i) { _h_Njets->fill(i); }
if (Njets < 1) vetoEvent;
for(size_t i = 0; i < Njets; ++i) { HT += jets[i].pT(); }
const double pT = jets[0].pT();
const double rap = jets[0].rapidity();
_h_HT->fill(HT);
_h_leading_jet_rap->fill(fabs(rap));
_h_leading_jet_pT->fill(pT);
if (Njets == 1) _h_leading_jet_pT_eq1jet->fill(pT);
if (Njets > 1) {
_h_leading_jet_pT_2jet->fill(pT);
_h_jet_dphi->fill( deltaPhi(jets[0], jets[1]));
_h_jet_mass->fill( (jets[0].momentum()+jets[1].momentum()).mass() );
}
if (Njets > 2) _h_leading_jet_pT_3jet->fill(pT);
if (Njets > 3) _h_leading_jet_pT_4jet->fill(pT);
}
void finalize() {
for (size_t i = 0; i < _h_Njets->numBins()-2; ++i) {
double n = _h_Njets->bin(i + 1).sumW();
double dN = _h_Njets->bin(i + 1).sumW2();
double d = _h_Njets->bin(i).sumW();
double dD = _h_Njets->bin(i).sumW2();
double r = safediv(n, d);
double e = sqrt( safediv(r * (1 - r), d) );
if ( _h_Njets->effNumEntries() != _h_Njets->numEntries() ) {
// use F. James's approximation for weighted events:
e = sqrt( safediv((1 - 2 * r) * dN + r * r * dD, d * d) );
}
_h_Njets_Ratio->point(i).setY(r, e);
}
// when running in combined mode, need to average to get lepton xsec
double normfac = crossSectionPerEvent();
if (_mode == 2) normfac = 0.5*normfac;
scale(_h_Njets, normfac );
scale(_h_Njets_excl, normfac );
scale(_h_HT, normfac );
scale(_h_leading_jet_rap, normfac );
scale(_h_leading_jet_pT, normfac );
scale(_h_leading_jet_pT_eq1jet, normfac );
scale(_h_leading_jet_pT_2jet, normfac );
scale(_h_leading_jet_pT_3jet, normfac );
scale(_h_leading_jet_pT_4jet, normfac );
scale(_h_jet_dphi, normfac );
scale(_h_jet_mass, normfac );
}
//@}
protected:
size_t _mode;
private:
Scatter2DPtr _h_Njets_Ratio;
Histo1DPtr _h_Njets;
Scatter2DPtr _h_Njets_excl_Ratio;
Histo1DPtr _h_Njets_excl;
Histo1DPtr _h_HT;
Histo1DPtr _h_leading_jet_rap;
Histo1DPtr _h_leading_jet_pT;
Histo1DPtr _h_leading_jet_pT_eq1jet;
Histo1DPtr _h_leading_jet_pT_2jet;
Histo1DPtr _h_leading_jet_pT_3jet;
Histo1DPtr _h_leading_jet_pT_4jet;
Histo1DPtr _h_jet_dphi;
Histo1DPtr _h_jet_mass;
};
RIVET_DECLARE_PLUGIN(ATLAS_2017_I1514251);
}
|