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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 "Rivet/Projections/VetoedFinalState.hh"
#include "Rivet/Projections/LeadingParticlesFinalState.hh"
namespace Rivet {
/// Electroweak Wjj production at 8 TeV
class ATLAS_2013_I1217863 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ATLAS_2013_I1217863);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Get options from the new option system
_mode = 2;
_doZ = true;
_doW = true;
if ( getOption("LMODE") == "EL" ) { _mode = 2;}
if ( getOption("LMODE") == "MU" ) _mode = 3;
if ( getOption("LMODE") == "ZEL" ) {
_mode = 2;
_doW = false;
}
if ( getOption("LMODE") == "ZMU" ) {
_mode = 3;
_doW = false;
}
if ( getOption("LMODE") == "WEL" ) {
_mode = 2;
_doZ = false;
}
if ( getOption("LMODE") == "WMU" ) {
_mode = 3;
_doZ = false;
}
FinalState fs;
declare(fs, "FS");
Cut cuts = Cuts::abseta < 2.47 && Cuts::pT > 25*GeV;
// Z finder
if (_doZ) {
ZFinder zf(fs, cuts, _mode==3? PID::MUON : PID::ELECTRON, 40.0*GeV, 1000.0*GeV, 0.1,
ZFinder::ChargedLeptons::PROMPT, ZFinder::ClusterPhotons::NODECAY, ZFinder::AddPhotons::NO);
declare(zf, "ZF");
}
if (_doW) {
// W finder for electrons and muons
WFinder wf(fs, cuts, _mode==3? PID::MUON : PID::ELECTRON, 0.0*GeV, 1000.0*GeV, 35.0*GeV, 0.1,
WFinder::ChargedLeptons::PROMPT, WFinder::ClusterPhotons::NODECAY, WFinder::AddPhotons::NO, WFinder::MassWindow::MT);
declare(wf, "WF");
}
// leading photon
LeadingParticlesFinalState photonfs(FinalState(Cuts::abseta < 2.37 && Cuts::pT > 15*GeV));
photonfs.addParticleId(PID::PHOTON);
declare(photonfs, "LeadingPhoton");
// jets
VetoedFinalState jet_fs(fs);
if (_doZ) { jet_fs.addVetoOnThisFinalState(getProjection<ZFinder>("ZF")); }
if (_doW) { jet_fs.addVetoOnThisFinalState(getProjection<WFinder>("WF")); }
jet_fs.addVetoOnThisFinalState(getProjection<LeadingParticlesFinalState>("LeadingPhoton"));
FastJets jets(jet_fs, FastJets::ANTIKT, 0.4, JetAlg::Muons::ALL, JetAlg::Invisibles::NONE);
declare(jets, "Jets");
// FS excluding the leading photon
VetoedFinalState vfs(fs);
vfs.addVetoOnThisFinalState(photonfs);
declare(vfs, "isolatedFS");
// Book histograms
if (_doZ) {
book(_hist_EgammaT_inclZ ,11, 1, _mode); // dSigma / dE^gamma_T for Njet >= 0
book(_hist_EgammaT_exclZ ,12, 1, _mode); // dSigma / dE^gamma_T for Njet = 0
book(_hist_Njet_EgammaT15Z ,17, 1, _mode); // dSigma / dNjet for E^gamma_T >= 15
book(_hist_Njet_EgammaT60Z ,18, 1, _mode); // dSigma / dNjet for E^gamma_T >= 60
book(_hist_mZgamma ,20, 1, _mode); // dSigma / dm^{Zgamma}
}
if (_doW){
book(_hist_EgammaT_inclW , 7, 1, _mode); // dSigma / dE^gamma_T for Njet >= 0
book(_hist_EgammaT_exclW , 8, 1, _mode); // dSigma / dE^gamma_T for Njet = 0
book(_hist_Njet_EgammaT15W ,15, 1, _mode); // dSigma / dNjet for E^gamma_T >= 15
book(_hist_Njet_EgammaT60W ,16, 1, _mode); // dSigma / dNjet for E^gamma_T >= 60
book(_hist_mWgammaT ,19, 1, _mode); // dSigma / dm^{Zgamma}
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// retrieve leading photon
Particles photons = apply<LeadingParticlesFinalState>(event, "LeadingPhoton").particles();
if (photons.size() != 1) vetoEvent;
const Particle& leadingPhoton = photons[0];
if (leadingPhoton.Et() < 15.0*GeV) vetoEvent;
if (leadingPhoton.abseta() > 2.37) vetoEvent;
// check photon isolation
double coneEnergy(0.0);
Particles fs = apply<VetoedFinalState>(event, "isolatedFS").particles();
for (const Particle& p : fs) {
if ( deltaR(leadingPhoton, p) < 0.4 ) coneEnergy += p.E();
}
if (coneEnergy / leadingPhoton.E() >= 0.5 ) vetoEvent;
if (_doW) {
// retrieve W boson candidate
const WFinder& wf = apply<WFinder>(event, "WF");
if ( wf.bosons().size() == 1 ) {
// retrieve constituent neutrino
const Particle& neutrino = wf.constituentNeutrino();
if ( (neutrino.pT() > 35.0*GeV) ) {
// retrieve constituent lepton
const Particle& lepton = wf.constituentLepton();
if ( lepton.pT() > 25.0*GeV && lepton.abseta() < 2.47 ) {
// check photon-lepton overlap
if ( deltaR(leadingPhoton, lepton) > 0.7 ) {
// count jets
const FastJets& jetfs = apply<FastJets>(event, "Jets");
Jets jets = jetfs.jets(cmpMomByEt);
int goodJets = 0;
for (const Jet& j : jets) {
if ( !(j.Et() > 30.0*GeV) ) break;
if ( (j.abseta() < 4.4) && \
(deltaR(leadingPhoton, j) > 0.3) && \
(deltaR(lepton, j) > 0.3) ) ++goodJets;
}
double Njets = double(goodJets) + 0.5;
double photonEt = leadingPhoton.Et()*GeV;
const FourMomentum& lep_gamma = lepton.momentum() + leadingPhoton.momentum();
double term1 = sqrt(lep_gamma.mass2() + lep_gamma.pT2()) + neutrino.Et();
double term2 = (lep_gamma + neutrino.momentum()).pT2();
double mWgammaT = sqrt(term1 * term1 - term2) * GeV;
_hist_EgammaT_inclW->fill(photonEt);
_hist_Njet_EgammaT15W->fill(Njets);
if ( !goodJets ) _hist_EgammaT_exclW->fill(photonEt);
if (photonEt > 40.0*GeV) {
_hist_mWgammaT->fill(mWgammaT);
if (photonEt > 60.0*GeV) _hist_Njet_EgammaT60W->fill(Njets);
}
}
}
}
}
}
if (_doZ ){
// retrieve Z boson candidate
const ZFinder& zf = apply<ZFinder>(event, "ZF");
if ( zf.bosons().size() == 1 ) {
const Particle& Zboson = zf.boson();
if ( (Zboson.mass() > 40.0*GeV) ) {
// check charge of constituent leptons
const Particles& leptons = zf.constituents();
if (leptons.size() == 2 && leptons[0].charge() * leptons[1].charge() < 0.) {
bool lpass = true;
// check photon-lepton overlap
for (const Particle& p : leptons) {
if ( !(p.pT() > 25.0*GeV && p.abseta() < 2.47 && deltaR(leadingPhoton, p) > 0.7) ) lpass = false;
}
if ( lpass ) {
// count jets
const FastJets& jetfs = apply<FastJets>(event, "Jets");
Jets jets = jetfs.jets(cmpMomByEt);
int goodJets = 0;
for (const Jet& j : jets) {
if ( !(j.Et() > 30.0*GeV) ) break;
if ( (j.abseta() < 4.4) && \
(deltaR(leadingPhoton, j) > 0.3) && \
(deltaR(leptons[0], j) > 0.3) && \
(deltaR(leptons[1], j) > 0.3) ) ++goodJets;
}
double Njets = double(goodJets) + 0.5;
double photonEt = leadingPhoton.Et()*GeV;
double mZgamma = (Zboson.momentum() + leadingPhoton.momentum()).mass() * GeV;
_hist_EgammaT_inclZ->fill(photonEt);
_hist_Njet_EgammaT15Z->fill(Njets);
if ( !goodJets ) _hist_EgammaT_exclZ->fill(photonEt);
if (photonEt >= 40.0*GeV) {
_hist_mZgamma->fill(mZgamma);
if (photonEt >= 60.0*GeV) _hist_Njet_EgammaT60Z->fill(Njets);
}
}
}
}
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
const double xs_fb = crossSection()/femtobarn;
const double sumw = sumOfWeights();
const double sf = xs_fb / sumw;
if (_doZ) {
scale(_hist_EgammaT_exclZ, sf);
scale(_hist_EgammaT_inclZ, sf);
normalize(_hist_Njet_EgammaT15Z);
normalize(_hist_Njet_EgammaT60Z);
normalize(_hist_mZgamma);
}
if (_doW) {
scale(_hist_EgammaT_exclW, sf);
scale(_hist_EgammaT_inclW, sf);
normalize(_hist_Njet_EgammaT15W);
normalize(_hist_Njet_EgammaT60W);
normalize(_hist_mWgammaT);
}
}
//@}
protected:
size_t _mode;
bool _doW;
bool _doZ;
private:
/// @name Histograms
//@{
Histo1DPtr _hist_EgammaT_inclZ;
Histo1DPtr _hist_EgammaT_exclZ;
Histo1DPtr _hist_Njet_EgammaT15Z;
Histo1DPtr _hist_Njet_EgammaT60Z;
Histo1DPtr _hist_mZgamma;
Histo1DPtr _hist_EgammaT_inclW;
Histo1DPtr _hist_EgammaT_exclW;
Histo1DPtr _hist_Njet_EgammaT15W;
Histo1DPtr _hist_Njet_EgammaT60W;
Histo1DPtr _hist_mWgammaT;
//@}
};
RIVET_DECLARE_PLUGIN(ATLAS_2013_I1217863);
}
|