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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/VetoedFinalState.hh"
#include "Rivet/Projections/IdentifiedFinalState.hh"
#include "Rivet/Projections/PromptFinalState.hh"
#include "Rivet/Projections/DressedLeptons.hh"
#include "Rivet/Projections/FastJets.hh"
namespace Rivet {
class ATLAS_2015_I1397637 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ATLAS_2015_I1397637);
/// Book projections and histograms
void init() {
// Base final state definition
const FinalState fs(Cuts::abseta < 4.5);
// Neutrinos for MET
IdentifiedFinalState nu_id;
nu_id.acceptNeutrinos();
PromptFinalState neutrinos(nu_id);
neutrinos.acceptTauDecays(true);
declare(neutrinos, "neutrinos");
// Get photons used to dress leptons
IdentifiedFinalState photons(fs);
photons.acceptId(PID::PHOTON);
// Use all bare muons as input to the DressedMuons projection
IdentifiedFinalState mu_id(fs);
mu_id.acceptIdPair(PID::MUON);
PromptFinalState bare_mu(mu_id);
bare_mu.acceptTauDecays(true);
// Use all bare electrons as input to the DressedElectrons projection
IdentifiedFinalState el_id(fs);
el_id.acceptIdPair(PID::ELECTRON);
PromptFinalState bare_el(el_id);
bare_el.acceptTauDecays(true);
// Use all bare leptons including taus for single-lepton filter
IdentifiedFinalState lep_id(fs);
lep_id.acceptIdPair(PID::MUON);
lep_id.acceptIdPair(PID::ELECTRON);
PromptFinalState bare_lep(lep_id);
declare(bare_lep, "bare_lep");
// Tau finding
/// @todo Use TauFinder
UnstableParticles ufs;
IdentifiedFinalState tau_id(ufs);
tau_id.acceptIdPair(PID::TAU);
PromptFinalState bare_tau(tau_id);
declare(bare_tau, "bare_tau");
// Muons and electrons must have |eta| < 2.5
Cut eta_ranges = Cuts::abseta < 2.5;
// Get dressed muons and the good muons (pt>25GeV)
DressedLeptons all_dressed_mu(photons, bare_mu, 0.1, eta_ranges, true);
DressedLeptons dressed_mu(photons, bare_mu, 0.1, eta_ranges && Cuts::pT > 25*GeV, true);
declare(dressed_mu, "muons");
// Get dressed electrons and the good electrons (pt>25GeV)
DressedLeptons all_dressed_el(photons, bare_el, 0.1, eta_ranges, true);
DressedLeptons dressed_el(photons, bare_el, 0.1, eta_ranges && Cuts::pT > 25*GeV, true);
declare(dressed_el, "electrons");
// Jet clustering
VetoedFinalState vfs(fs);
vfs.addVetoOnThisFinalState(all_dressed_el);
vfs.addVetoOnThisFinalState(all_dressed_mu);
vfs.addVetoOnThisFinalState(neutrinos);
// Small-R jets
/// @todo Use extra constructor args
FastJets jets(vfs, FastJets::ANTIKT, 0.4);
jets.useInvisibles(JetAlg::Invisibles::ALL);
jets.useMuons(JetAlg::Muons::DECAY);
declare(jets, "jets");
// Large-R jets
/// @todo Use extra constructor args
FastJets large_jets(vfs, FastJets::ANTIKT, 1.0);
large_jets.useInvisibles(JetAlg::Invisibles::ALL);
large_jets.useMuons(JetAlg::Muons::DECAY);
declare(large_jets, "fat_jets");
/// Book histogram
book(_h_pttop ,1, 1, 1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// Single lepton filter on bare leptons with no cuts
const Particles& bare_lep = apply<PromptFinalState>(event, "bare_lep").particles();
const Particles& bare_tau = apply<PromptFinalState>(event, "bare_tau").particles();
if (bare_lep.size() + bare_tau.size() != 1) vetoEvent;
// Electrons and muons
const vector<DressedLepton>& electrons = apply<DressedLeptons>(event, "electrons").dressedLeptons();
const vector<DressedLepton>& muons = apply<DressedLeptons>(event, "muons").dressedLeptons();
if (electrons.size() + muons.size() != 1) vetoEvent;
const DressedLepton& lepton = muons.empty() ? electrons[0] : muons[0];
// Get the neutrinos from the event record (they have pT > 0.0 and |eta| < 4.5 at this stage
const Particles& neutrinos = apply<PromptFinalState>(event, "neutrinos").particlesByPt();
FourMomentum met;
for (const Particle& nu : neutrinos) met += nu.momentum();
if (met.pT() < 20*GeV) vetoEvent;
// Thin jets and trimmed fat jets
/// @todo Use Rivet built-in FJ trimming support
const Jets& jets = apply<FastJets>(event, "jets").jetsByPt(Cuts::pT > 25*GeV && Cuts::abseta < 2.5);
const PseudoJets& fat_pjets = apply<FastJets>(event, "fat_jets").pseudoJetsByPt();
const double Rfilt = 0.3, ptFrac_min = 0.05; ///< @todo Need to be careful about the units for the pT cut passed to FJ?
PseudoJets trimmed_fat_pjets;
fastjet::Filter trimmer(fastjet::JetDefinition(fastjet::kt_algorithm, Rfilt), fastjet::SelectorPtFractionMin(ptFrac_min));
for (const PseudoJet& pjet : fat_pjets) trimmed_fat_pjets += trimmer(pjet);
trimmed_fat_pjets = fastjet::sorted_by_pt(trimmed_fat_pjets);
// Jet reclustering
// Use a kT cluster sequence to recluster the trimmed jets so that a d12 can then be obtained from the reclustered jet
vector<double> splittingScales;
for (const PseudoJet& tpjet : trimmed_fat_pjets) {
const PseudoJets tpjet_constits = tpjet.constituents();
const fastjet::ClusterSequence kt_cs(tpjet_constits, fastjet::JetDefinition(fastjet::kt_algorithm, 1.5, fastjet::E_scheme, fastjet::Best));
const PseudoJets kt_jets = kt_cs.inclusive_jets();
const double d12 = 1.5 * sqrt(kt_jets[0].exclusive_subdmerge(1));
splittingScales += d12;
}
Jets trimmed_fat_jets;
for (size_t i = 0; i < trimmed_fat_pjets.size(); ++i) {
const Jet tj = trimmed_fat_pjets[i];
if (tj.mass() <= 100*GeV) continue;
if (tj.pT() <= 300*GeV) continue;
if (splittingScales[i] <= 40*GeV) continue;
if (tj.abseta() >= 2.0) continue;
trimmed_fat_jets += tj;
}
if (trimmed_fat_jets.empty()) vetoEvent;
// Jet b-tagging
Jets bjets, non_bjets;
for (const Jet& jet : jets)
(jet.bTagged() ? bjets : non_bjets) += jet;
if (bjets.empty()) vetoEvent;
// Boosted selection: lepton/jet overlap
const double transmass = sqrt( 2 * lepton.pT() * met.pT() * (1 - cos(deltaPhi(lepton, met))) );
if (transmass + met.pt() <= 60*GeV) vetoEvent;
int lepJetIndex = -1;
for (size_t i = 0; i < jets.size(); ++i) {
const Jet& jet = jets[i];
if (deltaR(jet, lepton) < 1.5) {
lepJetIndex = i;
break;
}
}
if (lepJetIndex < 0) vetoEvent;
const Jet& ljet = jets[lepJetIndex];
// Boosted selection: lepton-jet/fat-jet matching
int fatJetIndex = -1;
for (size_t j = 0; j < trimmed_fat_jets.size(); ++j) {
const Jet& fjet = trimmed_fat_jets[j];
const double dR_fatjet = deltaR(ljet, fjet);
const double dPhi_fatjet = deltaPhi(lepton, fjet);
if (dR_fatjet > 1.5 && dPhi_fatjet > 2.3) {
fatJetIndex = j;
break;
}
}
if (fatJetIndex < 0) vetoEvent;
const Jet& fjet = trimmed_fat_jets[fatJetIndex];
// Boosted selection: b-tag matching
const bool lepbtag = ljet.bTagged();
bool hadbtag = false;
for (const Jet& bjet : bjets) {
hadbtag |= (deltaR(fjet, bjet) < 1.0);
}
// Fill histo if selection passed
if (hadbtag || lepbtag) _h_pttop->fill(fjet.pT()/GeV);
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h_pttop, crossSection()/femtobarn / sumOfWeights());
}
private:
Histo1DPtr _h_pttop;
};
RIVET_DECLARE_PLUGIN(ATLAS_2015_I1397637);
}
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