Rivet analyses
Semileptonic ttbar at 13 TeV
Experiment: ATLAS (LHC)
Inspire ID: 1750330
Status: VALIDATED
Authors: - Federica Fabbri - Francesco La Ruffa - Christian Gutschow
References: - Expt page: ATLAS-TOPQ-2018-15 - arXiv: 1908.07305
Beams: p+ p+
Beam energies: (6500.0, 6500.0)GeV
Run details: - pp -> non-allhadronic ttbar production at 13 TeV
Single- and double-differential cross-section measurements are presented for the production of top-quark pairs, in the lepton + jets channel at particle and parton level. Two topologies, resolved and boosted, are considered and the results are presented as a function of several kinematic variables characterising the top and the system and jet multiplicities. The study was performed using data from pp collisions at centre-of-mass energy of 13 TeV collected in 2015 and 2016 by the ATLAS detector at the CERN Large Hadron Collider (LHC), corresponding to an integrated luminosity of 36 fb−1. Due to the large tt̄ cross-section at the LHC, such measurements allow a detailed study of the properties of top-quark production and decay, enabling precision tests of several Monte Carlo generators and fixed-order Standard Model predictions. Overall, there is good agreement between the theoretical predictions and the data.
Source
code:ATLAS_2019_I1750330.cc
// -*- C++ -*
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/VetoedFinalState.hh"
#include "Rivet/Projections/InvisibleFinalState.hh"
#include "Rivet/Projections/PromptFinalState.hh"
#include "Rivet/Projections/LeptonFinder.hh"
#include "Rivet/Projections/MissingMomentum.hh"
#include "Rivet/Projections/FastJets.hh"
namespace Rivet {
/// @brief Semileptonic ttbar at 13 TeV
class ATLAS_2019_I1750330 : public Analysis {
public:
RIVET_DEFAULT_ANALYSIS_CTOR(ATLAS_2019_I1750330);
void init() {
_doBoosted = true, _doResolved = true;
if ( getOption("TYPE") == "BOOSTED" ) _doResolved = false;
else if ( getOption("TYPE") == "RESOLVED" ) _doBoosted = false;
Cut eta_full = (Cuts::abseta < 5.0);
Cut lep_cuts = (Cuts::abseta < 2.5) && (Cuts::pT > 27*GeV);
const FinalState fs(eta_full);
FinalState all_photons(fs, Cuts::abspid == PID::PHOTON);
PromptFinalState photons(all_photons, TauDecaysAs::NONPROMPT);
declare(photons, "photons");
PromptFinalState electrons(Cuts::abspid == PID::ELECTRON, TauDecaysAs::PROMPT);
declare(electrons, "electrons");
LeptonFinder dressedelectrons(electrons, photons, 0.1, lep_cuts);
declare(dressedelectrons, "dressedelectrons");
LeptonFinder ewdressedelectrons(electrons, all_photons, 0.1, eta_full);
declare(ewdressedelectrons, "ewdressedelectrons");
PromptFinalState muons(Cuts::abspid == PID::MUON, TauDecaysAs::PROMPT);
declare(muons, "muons");
LeptonFinder dressedmuons(muons, photons, 0.1, lep_cuts);
declare(dressedmuons, "dressedmuons");
LeptonFinder ewdressedmuons(muons, all_photons, 0.1, eta_full);
declare(ewdressedmuons, "ewdressedmuons");
InvisibleFinalState neutrinos(OnlyPrompt::YES, TauDecaysAs::PROMPT);
VetoedFinalState vfs_res(fs);
vfs_res.addVetoOnThisFinalState(ewdressedelectrons);
vfs_res.addVetoOnThisFinalState(ewdressedmuons);
vfs_res.addVetoOnThisFinalState(neutrinos);
FastJets jets_res(vfs_res, JetAlg::ANTIKT, 0.4, JetMuons::ALL, JetInvisibles::ALL);
declare(jets_res, "resolved_jets");
declare(MissingMomentum(), "MissingMomentum");
// Bins for 2D resolved
std::vector<double> ttbar_m_2D_bins = {200,400,550,700,1000,2000};
std::vector<double> top_had_pt_2D_bins = {0,60,120,200,300,1000};
std::vector<double> ttbar_pt_2D_bins = {0,30,80,190,800};
std::vector<double> top_had_abs_y_2D_bins = {0,0.7,1.4,2.5};
std::vector<double> ttbar_abs_y_2D_bins = {0.0,0.4,0.8,1.2,2.5};
std::vector<double> n_jet_bins = {3.5, 4.5, 5.5, 6.5, 7.5};
std::vector<double> n_jet_bins_for_ttbar_m = {3.5, 4.5, 5.5, 6.5};
std::vector<double> n_extrajet_bins = {-0.5, 0.5, 1.5, 2.5, 3.5, 4.5, 5.5, 6.5};
//Bins for 2D boosted
std::vector<double> eta_2D_bins = {0,1,2};
std::vector<double> etattbar_2D_bins = {0,60,120,200,300,1000};
std::vector<double> pttbar_2D_bins = {0.0, 40.0, 150.0, 1000.0};
std::vector<double> mtt_2D_bins = {490.0, 1160, 3000.0};
std::vector<double> eta_external_2D_bins = {0.0, 0.65, 1.3, 2.0};
std::vector<double> ptt_external_mtt_2D_bins = {0.0, 40.0, 150.0, 1000.0};
std::vector<double> Htt_external_2D_bins = {350.0, 780.0, 2500.0};
std::vector<double> eta_external_ptt_2D_bins = {0.0, 0.65, 2.0};
std::vector<double> n_jet_pttop_bins = {-0.5,1.5,2.5,3.5};
std::vector<double> n_jet_ptttbar_bins = {-0.5,1.5,3.5};
std::vector<double> n_jet_Pout_bins = {-0.5,1.5,3.5};
std::vector<double> n_jet_mtt_bins = {-0.5,0.5,1.5,2.5};
//Resolved histograms (digits correspond to "Table ID" from HepData)
book2D("ttbar_m_top_had_pt_multi_norm", ttbar_m_2D_bins,54);
book2D("ttbar_m_top_had_pt_multi", ttbar_m_2D_bins, 74);
book2D("ttbar_m_ttbar_pt_multi_norm", ttbar_m_2D_bins, 94);
book2D("ttbar_m_ttbar_pt_multi", ttbar_m_2D_bins, 114);
book2D("top_had_pt_absPout_multi_norm", top_had_pt_2D_bins, 134);
book2D("top_had_pt_absPout_multi", top_had_pt_2D_bins,154);
book2D("top_had_pt_jet_n_multi_norm", n_jet_bins,174);
book2D("top_had_pt_jet_n_multi", n_jet_bins, 188 );
book2D("ttbar_m_jet_n_multi_norm", n_jet_bins_for_ttbar_m,202);
book2D("ttbar_m_jet_n_multi", n_jet_bins_for_ttbar_m,211);
book2D("ttbar_pt_jet_n_multi_norm", n_jet_bins, 220 );
book2D("ttbar_pt_jet_n_multi", n_jet_bins, 234 );
book2D("absPout_jet_n_multi_norm", n_jet_bins, 248 );
book2D("absPout_jet_n_multi", n_jet_bins, 262 );
book2D("deltaPhi_tt_jet_n_multi_norm", n_jet_bins, 276 );
book2D("deltaPhi_tt_jet_n_multi", n_jet_bins, 290 );
book2D("HT_tt_jet_n_multi_norm", n_jet_bins, 304 );
book2D("HT_tt_jet_n_multi", n_jet_bins, 318 );
book2D("top_had_abs_y_jet_n_multi_norm", n_jet_bins, 332 );
book2D("top_had_abs_y_jet_n_multi", n_jet_bins, 346 );
book2D("ttbar_abs_y_jet_n_multi_norm", n_jet_bins, 360 );
book2D("ttbar_abs_y_jet_n_multi", n_jet_bins, 374 );
book2D("chi_tt_jet_n_multi_norm", n_jet_bins, 388 );
book2D("chi_tt_jet_n_multi", n_jet_bins, 402 );
book2D("top_had_abs_y_top_had_pt_multi_norm", top_had_abs_y_2D_bins,416 );
book2D("top_had_abs_y_top_had_pt_multi", top_had_abs_y_2D_bins, 425);
book2D("ttbar_abs_y_ttbar_pt_multi_norm", ttbar_abs_y_2D_bins, 434);
book2D("ttbar_abs_y_ttbar_pt_multi", ttbar_abs_y_2D_bins, 448);
book2D("ttbar_abs_y_ttbar_m_multi_norm", ttbar_abs_y_2D_bins, 462);
book2D("ttbar_abs_y_ttbar_m_multi", ttbar_abs_y_2D_bins, 476);
book2D("ttbar_pt_top_had_pt_multi_norm", ttbar_pt_2D_bins, 490);
book2D("ttbar_pt_top_had_pt_multi", ttbar_pt_2D_bins, 504);
book_hist("top_had_pt",1);
book_hist("top_had_abs_y_fine",5);
book_hist("leading_top_pt",9);
book_hist("subleading_top_pt",13);
book_hist("ttbar_m",17);
book_hist("ttbar_pt",21);
book_hist("absPout",25);
book_hist("deltaPhi_tt",29);
book_hist("HT_tt",33);
book_disc("extrajet_n",37);
book_hist("ttbar_abs_y_fine",41);
book_hist("abs_y_boost",45);
book_hist("chi_tt",49);
//Boosted histograms (digits correspond to "Table ID" from HepData)
book2D("boosted_rc_pttop_etatop_multi", eta_2D_bins, 922);
book2D("boosted_rc_pttop_etattbar_multi", eta_2D_bins, 912);
book2D("boosted_rc_pttop_ptttbar_multi", pttbar_2D_bins, 898);
book2D("boosted_rc_pttop_mttbar_multi", mtt_2D_bins, 932);
book2D("boosted_rc_mttbar_etattbar_multi", eta_external_2D_bins, 974);
book2D("boosted_rc_mttbar_ptttbar_multi", ptt_external_mtt_2D_bins, 956);
book2D("boosted_rc_mttbar_HT_multi", Htt_external_2D_bins, 942);
book2D("boosted_rc_pttop_extrajet_multi", n_jet_pttop_bins, 992);
book2D("boosted_rc_ptttbar_extrajet_multi", n_jet_ptttbar_bins, 1006);
book2D("boosted_rc_mttbar_extrajet_multi", n_jet_mtt_bins, 1020);
book2D("boosted_rc_pttop_etatop_multi_norm", eta_2D_bins, 917);
book2D("boosted_rc_pttop_etattbar_multi_norm", eta_2D_bins, 907);
book2D("boosted_rc_pttop_ptttbar_multi_norm", pttbar_2D_bins, 889);
book2D("boosted_rc_pttop_mttbar_multi_norm", mtt_2D_bins, 927);
book2D("boosted_rc_mttbar_etattbar_multi_norm", eta_external_2D_bins, 965);
book2D("boosted_rc_mttbar_ptttbar_multi_norm", ptt_external_mtt_2D_bins, 947);
book2D("boosted_rc_mttbar_HT_multi_norm", Htt_external_2D_bins, 937);
book2D("boosted_rc_pttop_extrajet_multi_norm", n_jet_pttop_bins, 983);
book2D("boosted_rc_ptttbar_extrajet_multi_norm", n_jet_ptttbar_bins, 1001);
book2D("boosted_rc_mttbar_extrajet_multi_norm", n_jet_mtt_bins, 1011);
book_hist("hadTop_boosted_rc_pt",840);
book_hist("hadTop_boosted_rc_y",844);
book_hist("LeadingTop_boosted_rc_pt",848);
book_hist("SubLeadingTop_boosted_rc_pt",852);
book_hist("boosted_rc_Pout_lep",872);
book_hist("boosted_rc_chi_tt",868);
book_hist("boosted_rc_HT",876);
book_disc("hadTop_boosted_rc_subjets",884);
book_disc("boosted_rc_extrajet",880);
book_hist("ttbar_boosted_rc_m",864);
book_hist("ttbar_boosted_rc_pt",856);
book_hist("ttbar_boosted_rc_Rapidity",860);
}
void analyze(const Event& event) {
if (_doResolved) Resolved_selection(event);
if (_doBoosted) Boosted_selection(event);
}
void Resolved_selection(const Event& event) {
// Get the selected objects, using the projections.
DressedLeptons electrons = apply<LeptonFinder>(event, "dressedelectrons").dressedLeptons();
DressedLeptons muons = apply<LeptonFinder>(event, "dressedmuons").dressedLeptons();
const Jets& jets = apply<FastJets>(event, "resolved_jets").jetsByPt(Cuts::pT > 25*GeV && Cuts::abseta < 2.5);
FourMomentum met = apply<MissingMomentum>(event, "MissingMomentum").missingMomentum();
Jets bjets, lightjets;
// OVERLAP REMOVAL
idiscardIfAnyDeltaRLess(muons, jets, 0.4);
idiscardIfAnyDeltaRLess(electrons, jets, 0.4);
// b-tagging
// If there are more than 2 b-tagged jets, the extra b-tagged jets will be treat as light jets
for (const Jet& jet : jets) {
bool b_tagged = jet.bTagged(Cuts::pT > 5*GeV);
if ( b_tagged && bjets.size() < 2) bjets +=jet;
else lightjets += jet;
}
bool single_electron = electrons.size() == 1 && muons.empty();
bool single_muon = muons.size() == 1 && electrons.empty();
DressedLepton *lepton = NULL;
if (single_electron) lepton = &electrons[0];
else if (single_muon) lepton = &muons[0];
if (!single_electron && !single_muon) vetoEvent;
bool num_b_tagged_jets = (bjets.size() == 2);
if (!num_b_tagged_jets) vetoEvent;
if (lightjets.size() < 2) vetoEvent;
FourMomentum pbjet1; //Momentum of bjet1
FourMomentum pbjet2; //Momentum of bjet
if ( deltaR(bjets[0], *lepton) <= deltaR(bjets[1], *lepton) ) {
pbjet1 = bjets[0].momentum();
pbjet2 = bjets[1].momentum();
} else {
pbjet1 = bjets[1].momentum();
pbjet2 = bjets[0].momentum();
}
double bestWmass = 1000.0*TeV;
double mWPDG = 80.399*GeV;
int Wj1index = -1, Wj2index = -1;
for (unsigned int i = 0; i < (lightjets.size() - 1); ++i) {
for (unsigned int j = i + 1; j < lightjets.size(); ++j) {
double wmass = (lightjets[i].momentum() + lightjets[j].momentum()).mass();
if (fabs(wmass - mWPDG) < fabs(bestWmass - mWPDG)) {
bestWmass = wmass;
Wj1index = i;
Wj2index = j;
}
}
}
FourMomentum pjet1 = lightjets[Wj1index].momentum();
FourMomentum pjet2 = lightjets[Wj2index].momentum();
// compute hadronic W boson
FourMomentum pWhadron = pjet1 + pjet2;
double pz = computeneutrinoz(lepton->momentum(), met);
FourMomentum ppseudoneutrino( sqrt(sqr(met.px()) + sqr(met.py()) + sqr(pz)), met.px(), met.py(), pz);
//compute leptonic, hadronic, combined pseudo-top
FourMomentum ppseudotoplepton = lepton->momentum() + ppseudoneutrino + pbjet1;
FourMomentum ppseudotophadron = pbjet2 + pWhadron;
FourMomentum pttbar = ppseudotoplepton + ppseudotophadron;
Vector3 z_versor(0,0,1);
Vector3 vpseudotophadron = ppseudotophadron.vector3();
Vector3 vpseudotoplepton = ppseudotoplepton.vector3();
// Variables
double ystar = (ppseudotophadron.pt() > ppseudotoplepton.pt()) ? 0.5 * (ppseudotophadron.rap()-ppseudotoplepton.rap()) : 0.5*(ppseudotoplepton.rap()-ppseudotophadron.rap());
double chi_ttbar = exp(2 * fabs(ystar));
double deltaPhi_ttbar = deltaPhi(ppseudotoplepton,ppseudotophadron);
double HT_ttbar = ppseudotophadron.pt() + ppseudotoplepton.pt();
double Yboost = 0.5 * (ppseudotophadron.rapidity() + ppseudotoplepton.rapidity());
double Pout = vpseudotophadron.dot((vpseudotoplepton.cross(z_versor))/(vpseudotoplepton.cross(z_versor).mod()));
double absPout = fabs(Pout);
double Leading_top_pt = (ppseudotophadron.pt() > ppseudotoplepton.pt()) ? ppseudotophadron.pt() : ppseudotoplepton.pt();
double Subleading_top_pt = (ppseudotophadron.pt() > ppseudotoplepton.pt()) ? ppseudotoplepton.pt() : ppseudotophadron.pt();
int jet_multiplicity = jets.size();
int extrajet_n = jet_multiplicity - 4;
int new_jet_multi = TransformJetMultiplicity(jet_multiplicity);
int new_jet_multi_for_ttbar_m = TransformJetMultiplicity_for_ttbar_m(jet_multiplicity);
const string new_extrajet_multi = TransformExtrajetMultiplicity(extrajet_n);
_h_multi["top_had_pt_absPout_multi"]->fill(ppseudotophadron.pt()/GeV, absPout);
_h_multi["ttbar_m_top_had_pt_multi"]->fill(pttbar.mass()/GeV, ppseudotophadron.pt()/GeV);
_h_multi["ttbar_m_ttbar_pt_multi"]->fill(pttbar.mass()/GeV, pttbar.pt()/GeV);
_h_multi["ttbar_pt_top_had_pt_multi"]->fill(pttbar.pt()/GeV, ppseudotophadron.pt()/GeV);
_h_multi["ttbar_abs_y_ttbar_pt_multi"]->fill(pttbar.absrap(), pttbar.pt()/GeV);
_h_multi["ttbar_abs_y_ttbar_m_multi"]->fill(pttbar.absrap(), pttbar.mass()/GeV);
_h_multi["top_had_abs_y_top_had_pt_multi"]->fill(ppseudotophadron.absrap(), ppseudotophadron.pt()/GeV);
_h_multi["ttbar_pt_jet_n_multi"]->fill(new_jet_multi, pttbar.pt()/GeV);
_h_multi["ttbar_m_jet_n_multi"]->fill(new_jet_multi_for_ttbar_m, pttbar.mass()/GeV);
_h_multi["chi_tt_jet_n_multi"]->fill(new_jet_multi, chi_ttbar);
_h_multi["absPout_jet_n_multi"]->fill(new_jet_multi, absPout);
_h_multi["deltaPhi_tt_jet_n_multi"]->fill(new_jet_multi, deltaPhi_ttbar);
_h_multi["HT_tt_jet_n_multi"]->fill(new_jet_multi, HT_ttbar/GeV);
_h_multi["top_had_pt_jet_n_multi"]->fill(new_jet_multi, ppseudotophadron.pt()/GeV);
_h_multi["top_had_abs_y_jet_n_multi"]->fill(new_jet_multi, ppseudotophadron.absrap());
_h_multi["ttbar_abs_y_jet_n_multi"]->fill(new_jet_multi, pttbar.absrap());
_h_multi["top_had_pt_absPout_multi_norm"]->fill(ppseudotophadron.pt()/GeV, absPout);
_h_multi["ttbar_m_top_had_pt_multi_norm"]->fill(pttbar.mass()/GeV, ppseudotophadron.pt()/GeV);
_h_multi["ttbar_m_ttbar_pt_multi_norm"]->fill(pttbar.mass()/GeV, pttbar.pt()/GeV);
_h_multi["ttbar_pt_top_had_pt_multi_norm"]->fill(pttbar.pt()/GeV, ppseudotophadron.pt()/GeV);
_h_multi["ttbar_abs_y_ttbar_pt_multi_norm"]->fill(pttbar.absrap(), pttbar.pt()/GeV);
_h_multi["ttbar_abs_y_ttbar_m_multi_norm"]->fill(pttbar.absrap(), pttbar.mass()/GeV);
_h_multi["top_had_abs_y_top_had_pt_multi_norm"]->fill(ppseudotophadron.absrap(), ppseudotophadron.pt()/GeV);
_h_multi["ttbar_pt_jet_n_multi_norm"]->fill(new_jet_multi, pttbar.pt());
_h_multi["ttbar_m_jet_n_multi_norm"]->fill(new_jet_multi_for_ttbar_m, pttbar.mass());
_h_multi["chi_tt_jet_n_multi_norm"]->fill(new_jet_multi, chi_ttbar);
_h_multi["absPout_jet_n_multi_norm"]->fill(new_jet_multi, absPout);
_h_multi["deltaPhi_tt_jet_n_multi_norm"]->fill(new_jet_multi, deltaPhi_ttbar);
_h_multi["HT_tt_jet_n_multi_norm"]->fill(new_jet_multi, HT_ttbar/GeV);
_h_multi["top_had_pt_jet_n_multi_norm"]->fill(new_jet_multi, ppseudotophadron.pt()/GeV);
_h_multi["top_had_abs_y_jet_n_multi_norm"]->fill(new_jet_multi, ppseudotophadron.absrap());
_h_multi["ttbar_abs_y_jet_n_multi_norm"]->fill(new_jet_multi, pttbar.absrap());
_h["chi_tt"]->fill(chi_ttbar);
_h["deltaPhi_tt"]->fill(deltaPhi_ttbar);
_h["HT_tt"]->fill(HT_ttbar/GeV);
_h["absPout"]->fill(absPout);
_h["abs_y_boost"]->fill(fabs(Yboost));
_h["top_had_pt"]->fill(ppseudotophadron.pt()/GeV);
_h["top_had_abs_y_fine"]->fill(ppseudotophadron.absrap());
_h["ttbar_pt"]->fill(pttbar.pt()/GeV);
_h["ttbar_m"]->fill(pttbar.mass()/GeV);
_h["ttbar_abs_y_fine"]->fill(pttbar.absrap());
_h["leading_top_pt"]->fill(Leading_top_pt/GeV);
_h["subleading_top_pt"]->fill(Subleading_top_pt/GeV);
_d["extrajet_n"]->fill(new_extrajet_multi);
_h["chi_tt_norm"]->fill(chi_ttbar);
_h["deltaPhi_tt_norm"]->fill(deltaPhi_ttbar);
_h["HT_tt_norm"]->fill(HT_ttbar/GeV);
_h["absPout_norm"]->fill(absPout);
_h["abs_y_boost_norm"]->fill(fabs(Yboost));
_h["top_had_pt_norm"]->fill(ppseudotophadron.pt()/GeV);
_h["top_had_abs_y_fine_norm"]->fill(ppseudotophadron.absrap());
_h["ttbar_pt_norm"]->fill(pttbar.pt()/GeV);
_h["ttbar_m_norm"]->fill(pttbar.mass()/GeV);
_h["ttbar_abs_y_fine_norm"]->fill(pttbar.absrap());
_h["leading_top_pt_norm"]->fill(Leading_top_pt/GeV);
_h["subleading_top_pt_norm"]->fill(Subleading_top_pt/GeV);
_d["extrajet_n_norm"]->fill(new_extrajet_multi);
}
void Boosted_selection(const Event& event) {
//Projections
DressedLeptons electrons = apply<LeptonFinder>(event, "dressedelectrons").dressedLeptons();
DressedLeptons muons = apply<LeptonFinder>(event, "dressedmuons").dressedLeptons();
const Jets& jets = apply<FastJets>(event, "resolved_jets").jetsByPt(Cuts::pT > 25*GeV && Cuts::abseta <= 2.5);
const FourMomentum& met = apply<MissingMomentum>(event, "MissingMomentum").missingMomentum();
if (jets.size() < 2) vetoEvent;
PseudoJets smallRjets;
for (const Jet& jet : jets) {
smallRjets += jet.pseudojet();
bool b_tagged = jet.bTagged(Cuts::pT > 5*GeV);
smallRjets[smallRjets.size()-1].set_user_index(b_tagged); // cheeky, but works
}
idiscardIfAnyDeltaRLess(muons, jets, 0.4);
idiscardIfAnyDeltaRLess(electrons, jets, 0.4);
fastjet::Filter trimmer(fastjet::JetDefinition(fastjet::antikt_algorithm, 1.0), fastjet::SelectorPtFractionMin(0.05));
fastjet::ClusterSequence antikt_cs(smallRjets, fastjet::JetDefinition(fastjet::antikt_algorithm, 1.0));
PseudoJets reclustered_jets = antikt_cs.inclusive_jets();
// trim the jets
Jets TrimmedJets;
for (const PseudoJet& pjet : reclustered_jets) {
PseudoJet ptrim = trimmer(pjet);
if (ptrim.perp() < 350*GeV) continue;
if (fabs(ptrim.eta()) > 2.0) continue;
bool bTagged = false;
Particles constituents;
for (const PseudoJet& c : ptrim.constituents()) {
// we only care about the number of subjets, so
// fine to treat as Particles with dummy PID
constituents += Particle(0, momentum(c));
bTagged |= c.user_index();
}
ptrim.set_user_index(bTagged);
TrimmedJets += Jet(ptrim, constituents);
}
Cut trim_selection = Cuts::abseta < 2.0 && Cuts::pT > 200*GeV && Cuts::massIn(120*GeV, 220*GeV);
iselect(isortByPt(TrimmedJets), trim_selection);
if (TrimmedJets.empty()) vetoEvent;
// SINGLE LEPTON
bool single_electron=(electrons.size() == 1) && (muons.empty());
bool single_muon=(muons.size() == 1) && (electrons.empty());
DressedLepton *lepton = NULL;
if (single_electron) lepton = &electrons[0];
else if (single_muon) lepton = &muons[0];
if (!single_electron && !single_muon) vetoEvent;
//MET
if (met.pT() < 20*GeV) vetoEvent;
//MET+MWT
double transmass = TransMass(lepton->pt(), lepton->phi(), met.pt(), met.phi());
if ((met.pT() + transmass) < 60*GeV) vetoEvent;
size_t subjets = 0;
bool btag_hadside=false;
bool hasHadTopCandidate = false;
FourMomentum HadTopCandidate;
for (const Jet& rc_jet : TrimmedJets) {
FourMomentum rc_jet_mom = rc_jet.mom();
if (rc_jet_mom.pt() < 350*GeV) continue;
double dPhi_lepJet = fabs(deltaPhi(rc_jet_mom.phi(), lepton->phi()));
if (dPhi_lepJet < 1.) continue;
if (rc_jet.pseudojet().user_index()) {
btag_hadside=true;
}
HadTopCandidate = momentum(rc_jet);
subjets = rc_jet.constituents().size();
hasHadTopCandidate = true;
break;
}
if (!hasHadTopCandidate) vetoEvent;
Jets LepTopCandidates = discard(jets, [&](const Jet& j) {
return deltaR(j, HadTopCandidate) < 1.5 || deltaR(j, *lepton) > 2.0;
});
if (LepTopCandidates.empty()) vetoEvent;
FourMomentum ltop;
bool btag_lepside=false;
for (const Jet& jet : LepTopCandidates) {
if (jet.bTagged(Cuts::pT > 5*GeV)) {
btag_lepside = true;
ltop = jet.mom();
break;
}
}
if (!btag_hadside && !btag_lepside) vetoEvent;
if (!btag_lepside) ltop = LepTopCandidates[0].momentum();
double pz = computeneutrinoz(lepton->momentum(), met);
FourMomentum neutrino( sqrt(sqr(met.px()) + sqr(met.py()) + sqr(pz)), met.px(), met.py(), pz);
FourMomentum LeptonicTop = lepton->momentum() + neutrino + ltop;
FourMomentum HadronicTop = HadTopCandidate;
FourMomentum pttbar = HadronicTop + LeptonicTop;
Vector3 z_versor(0,0,1);
Vector3 vpseudotophadron = HadronicTop.vector3();
Vector3 vpseudotoplepton = LeptonicTop.vector3();
// Variables
double ystar = (HadronicTop.pt() > LeptonicTop.pt()) ? 0.5 * (HadronicTop.rap()-LeptonicTop.rap()) : 0.5*(LeptonicTop.rap()-HadronicTop.rap());
double chi_ttbar = exp(2 * fabs(ystar));
double pt_leading = (HadronicTop.pt() > LeptonicTop.pt()) ? HadronicTop.pt() : LeptonicTop.pt();
double pt_subleading = (HadronicTop.pt() > LeptonicTop.pt()) ? LeptonicTop.pt() : HadronicTop.pt();
double HT_ttbar = HadronicTop.pt() + LeptonicTop.pt();
double absPout_lep = fabs(vpseudotoplepton.dot((vpseudotophadron.cross(z_versor))/(vpseudotophadron.cross(z_versor).mod())));
size_t extrajet = smallRjets.size() - subjets -1;
const string new_subjets_multi = TransformExtrajetMultiplicity_boosted(subjets);
const string new_extrajet_multi = TransformExtrajetMultiplicity_boosted(extrajet);
size_t new_extrajet_multi_pttop = TransformJetMultiplicity_pttop(extrajet);
size_t new_extrajet_multi_ptttbar = TransformJetMultiplicity_ptttbar(extrajet);
size_t new_extrajet_multi_mttbar = TransformJetMultiplicity_mttbar(extrajet);
_h_multi["boosted_rc_pttop_etatop_multi"]->fill(HadronicTop.absrap(), HadronicTop.pt()/GeV);
_h_multi["boosted_rc_pttop_etattbar_multi"]->fill(pttbar.absrap(), HadronicTop.pt()/GeV);
_h_multi["boosted_rc_pttop_ptttbar_multi"]->fill(pttbar.pt()/GeV, HadronicTop.pt()/GeV);
_h_multi["boosted_rc_pttop_mttbar_multi"]->fill(pttbar.mass()/GeV, HadronicTop.pt()/GeV);
_h_multi["boosted_rc_mttbar_etattbar_multi"]->fill(pttbar.absrap(), pttbar.mass()/GeV);
_h_multi["boosted_rc_mttbar_ptttbar_multi"]->fill(pttbar.pt()/GeV, pttbar.mass()/GeV);
_h_multi["boosted_rc_mttbar_HT_multi"]->fill(HT_ttbar, pttbar.mass()/GeV);
_h_multi["boosted_rc_pttop_extrajet_multi"]->fill(new_extrajet_multi_pttop, HadronicTop.pt()/GeV);
_h_multi["boosted_rc_ptttbar_extrajet_multi"]->fill(new_extrajet_multi_ptttbar, pttbar.pt()/GeV);
_h_multi["boosted_rc_mttbar_extrajet_multi"]->fill(new_extrajet_multi_mttbar, pttbar.mass()/GeV);
_h_multi["boosted_rc_pttop_etatop_multi_norm"]->fill(HadronicTop.absrap(), HadronicTop.pt()/GeV);
_h_multi["boosted_rc_pttop_etattbar_multi_norm"]->fill(pttbar.absrap(), HadronicTop.pt()/GeV);
_h_multi["boosted_rc_pttop_ptttbar_multi_norm"]->fill(pttbar.pt()/GeV, HadronicTop.pt()/GeV);
_h_multi["boosted_rc_pttop_mttbar_multi_norm"]->fill(pttbar.mass()/GeV, HadronicTop.pt()/GeV);
_h_multi["boosted_rc_mttbar_etattbar_multi_norm"]->fill(pttbar.absrap(), pttbar.mass()/GeV);
_h_multi["boosted_rc_mttbar_ptttbar_multi_norm"]->fill(pttbar.pt()/GeV, pttbar.mass()/GeV);
_h_multi["boosted_rc_mttbar_HT_multi_norm"]->fill(HT_ttbar/GeV, pttbar.mass()/GeV);
_h_multi["boosted_rc_pttop_extrajet_multi_norm"]->fill(new_extrajet_multi_pttop, HadronicTop.pt()/GeV);
_h_multi["boosted_rc_ptttbar_extrajet_multi_norm"]->fill(new_extrajet_multi_ptttbar, pttbar.pt()/GeV);
_h_multi["boosted_rc_mttbar_extrajet_multi_norm"]->fill(new_extrajet_multi_mttbar, pttbar.mass()/GeV);
_h["hadTop_boosted_rc_pt"]->fill(HadronicTop.pt()/GeV);
_h["hadTop_boosted_rc_y"]->fill(HadronicTop.absrap());
_h["LeadingTop_boosted_rc_pt"]->fill(pt_leading/GeV);
_h["SubLeadingTop_boosted_rc_pt"]->fill(pt_subleading/GeV);
_h["boosted_rc_Pout_lep"]->fill(absPout_lep);
_h["boosted_rc_chi_tt"]->fill(chi_ttbar);
_h["boosted_rc_HT"]->fill(HT_ttbar/GeV);
_d["hadTop_boosted_rc_subjets"]->fill(new_subjets_multi);
_d["boosted_rc_extrajet"]->fill(new_extrajet_multi);
_h["ttbar_boosted_rc_m"]->fill(pttbar.mass()/GeV);
_h["ttbar_boosted_rc_pt"]->fill(pttbar.pt()/GeV);
_h["ttbar_boosted_rc_Rapidity"]->fill(pttbar.absrapidity());
_h["hadTop_boosted_rc_pt_norm"]->fill(HadronicTop.pt()/GeV);
_h["hadTop_boosted_rc_y_norm"]->fill(HadronicTop.absrap());
_h["LeadingTop_boosted_rc_pt_norm"]->fill(pt_leading/GeV);
_h["SubLeadingTop_boosted_rc_pt_norm"]->fill(pt_subleading/GeV);
_h["boosted_rc_Pout_lep_norm"]->fill(absPout_lep);
_h["boosted_rc_chi_tt_norm"]->fill(chi_ttbar);
_h["boosted_rc_HT_norm"]->fill(HT_ttbar/GeV);
_d["hadTop_boosted_rc_subjets_norm"]->fill(new_subjets_multi);
_d["boosted_rc_extrajet_norm"]->fill(new_extrajet_multi);
_h["ttbar_boosted_rc_m_norm"]->fill(pttbar.mass()/GeV);
_h["ttbar_boosted_rc_pt_norm"]->fill(pttbar.pt()/GeV);
_h["ttbar_boosted_rc_Rapidity_norm"]->fill(pttbar.absrap());
}
void finalize() {
// Normalize to cross-section
const double sf = crossSection()/picobarn / sumOfWeights();
for (auto& hit : _h) {
if (hit.first.find("_norm") != string::npos) normalize(hit.second, 1.0, false);
else scale(hit.second, sf);
}
for (auto& hit : _d) {
scale(hit.second, sf);
if (hit.first.find("_norm") != string::npos) normalize(hit.second, 1.0, false);
}
for (auto& hit : _h_multi) {
if (hit.first.find("_norm") != string::npos) {
normalizeGroup(hit.second, 1.0, false);
}
else {
scale(hit.second, sf);
}
}
divByGroupWidth(_h_multi);
}
private:
bool _doBoosted, _doResolved;
double TransMass(double ptLep, double phiLep, double met, double phiMet) {
return std::sqrt(2.0*ptLep*met*( 1 - std::cos( phiLep-phiMet ) ) );
}
double computeneutrinoz(const FourMomentum& lepton, const FourMomentum& met) const {
//computing z component of neutrino momentum given lepton and met
double pzneutrino;
double m_W = 80.399; // in GeV, given in the paper
double k = (( sqr( m_W ) - sqr( lepton.mass() ) ) / 2 ) + (lepton.px() * met.px() + lepton.py() * met.py());
double a = sqr ( lepton.E() )- sqr ( lepton.pz() );
double b = -2*k*lepton.pz();
double c = sqr( lepton.E() ) * sqr( met.pT() ) - sqr( k );
double discriminant = sqr(b) - 4 * a * c;
double quad[2] = { (- b - sqrt(discriminant)) / (2 * a), (- b + sqrt(discriminant)) / (2 * a) }; //two possible quadratic solns
if (discriminant < 0) pzneutrino = - b / (2 * a); //if the discriminant is negative
else { //if the discriminant is greater than or equal to zero, take the soln with smallest absolute value
double absquad[2];
for (int n=0; n<2; ++n) absquad[n] = fabs(quad[n]);
if (absquad[0] < absquad[1]) pzneutrino = quad[0];
else pzneutrino = quad[1];
}
return pzneutrino;
}
void book2D(const string& name, const std::vector<double>& doubleDiff_bins, size_t table){
book(_h_multi[name], doubleDiff_bins);
for (auto& b : _h_multi[name]->bins()) {
book(b, table+b.index(), 1, 1);
}
}
void book_hist(const string& name, size_t table) {
// HepData entry has dummy "Table of Contents",
// so need to offset everything by one unit
book(_h[name], table+3, 1, 1);
book(_h[name+"_norm"], table+1, 1, 1);
}
void book_disc(const string& name, size_t table) {
// HepData entry has dummy "Table of Contents",
// so need to offset everything by one unit
book(_d[name], table+3, 1, 1);
book(_d[name+"_norm"], table+1, 1, 1);
}
size_t TransformJetMultiplicity(size_t jet_n) const { return jet_n > 7 ? 7 : jet_n; }
string TransformExtrajetMultiplicity(size_t jet_n) const {
if (jet_n == 0) return "0.0"s;
else if (jet_n == 1) return "1.0"s;
else if (jet_n == 2) return "2.0"s;
else if (jet_n == 3) return "3.0"s;
else if (jet_n == 4) return "4.0"s;
else if (jet_n == 5) return "5.0"s;
else return "$\\geq$6.0"s;
}
string TransformExtrajetMultiplicity_boosted(size_t jet_n) const {
if (jet_n == 0) return "0.0"s;
else if (jet_n == 1) return "1.0"s;
else if (jet_n == 2) return "2.0"s;
else if (jet_n == 3) return "3.0"s;
else return "$\\geq$4.0"s;
}
size_t TransformJetMultiplicity_for_ttbar_m(size_t jet_n) const { return jet_n > 6 ? 6 : jet_n; }
size_t TransformJetMultiplicity_pttop(size_t jet_n) const {
if (jet_n < 2) return 0;
if (jet_n == 2) return 2;
if (jet_n > 2) return 3;
return jet_n;
}
size_t TransformJetMultiplicity_ptttbar(size_t jet_n) const {
if (jet_n < 2) return 0;
if (jet_n >= 2) return 2;
return jet_n;
}
size_t TransformJetMultiplicity_mttbar(size_t jet_n) const {
if (jet_n == 0) return 0;
if (jet_n == 1) return 1;
if (jet_n >= 2) return 2;
return jet_n;
}
/// @name Objects that are used by the event selection decisions
/// @{
map<string, Histo1DPtr> _h;
map<string, BinnedHistoPtr<string>> _d;
map<string, Histo1DGroupPtr> _h_multi;
/// @}
};
RIVET_DECLARE_PLUGIN(ATLAS_2019_I1750330);
}