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| // -*- C++ -*-
#include "Rivet/Analysis.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"
#include <bitset>
namespace Rivet {
/// @brief ATLAS 7 TeV jets in ttbar events analysis
///
/// @author W. H. Bell <W.Bell@cern.ch>
/// @author A. Grohsjean <alexander.grohsjean@desy.de>
class ATLAS_2014_I1304688 : public Analysis {
public:
ATLAS_2014_I1304688():
Analysis("ATLAS_2014_I1304688"),
_jet_ntag(0),
_met_et(0.),
_met_phi(0.),
_hMap(),
//_chanLimit(3),
_histLimit(6)
{ }
void init() {
// Eta ranges
/// @todo 1 MeV? Really?
Cut eta_full = Cuts::abseta < 5.0 && Cuts::pT > 1.0*MeV;
Cut eta_lep = Cuts::abseta < 2.5;
// All final state particles
FinalState fs(eta_full);
// Get photons to dress leptons
IdentifiedFinalState photons(fs);
photons.acceptIdPair(PID::PHOTON);
// Projection to find the electrons
IdentifiedFinalState el_id(fs);
el_id.acceptIdPair(PID::ELECTRON);
PromptFinalState electrons(el_id);
electrons.acceptTauDecays(true);
declare(electrons, "electrons");
DressedLeptons dressedelectrons(photons, electrons, 0.1, eta_lep && Cuts::pT > 25*GeV, true);
declare(dressedelectrons, "dressedelectrons");
DressedLeptons vetodressedelectrons(photons, electrons, 0.1, eta_lep && Cuts::pT >= 15*GeV, true);
declare(vetodressedelectrons, "vetodressedelectrons");
DressedLeptons ewdressedelectrons(photons, electrons, 0.1, eta_full, true);
declare(ewdressedelectrons, "ewdressedelectrons");
// Projection to find the muons
IdentifiedFinalState mu_id(fs);
mu_id.acceptIdPair(PID::MUON);
PromptFinalState muons(mu_id);
muons.acceptTauDecays(true);
declare(muons, "muons");
vector<pair<double, double> > eta_muon;
DressedLeptons dressedmuons(photons, muons, 0.1, eta_lep && Cuts::pT >= 25*GeV, true);
declare(dressedmuons, "dressedmuons");
DressedLeptons vetodressedmuons(photons, muons, 0.1, eta_lep && Cuts::pT >= 15*GeV, true);
declare(vetodressedmuons, "vetodressedmuons");
DressedLeptons ewdressedmuons(photons, muons, 0.1, eta_full, true);
declare(ewdressedmuons, "ewdressedmuons");
// Projection to find neutrinos and produce MET
IdentifiedFinalState nu_id;
nu_id.acceptNeutrinos();
PromptFinalState neutrinos(nu_id);
neutrinos.acceptTauDecays(true);
declare(neutrinos, "neutrinos");
// Jet clustering.
VetoedFinalState vfs;
vfs.addVetoOnThisFinalState(ewdressedelectrons);
vfs.addVetoOnThisFinalState(ewdressedmuons);
vfs.addVetoOnThisFinalState(neutrinos);
FastJets jets(vfs, FastJets::ANTIKT, 0.4);
jets.useInvisibles();
declare(jets, "jets");
// Book histograms
for (unsigned int ihist = 0; ihist < _histLimit ; ihist++) {
const unsigned int threshLimit = _thresholdLimit(ihist);
for (unsigned int ithres = 0; ithres < threshLimit; ithres++) {
_histogram(ihist, ithres); // Create all histograms
}
}
}
void analyze(const Event& event) {
// Get the selected objects, using the projections.
_dressedelectrons = sortByPt(apply<DressedLeptons>(event, "dressedelectrons").dressedLeptons());
_vetodressedelectrons = apply<DressedLeptons>(event, "vetodressedelectrons").dressedLeptons();
_dressedmuons = sortByPt(apply<DressedLeptons>(event, "dressedmuons").dressedLeptons());
_vetodressedmuons = apply<DressedLeptons>(event, "vetodressedmuons").dressedLeptons();
_neutrinos = apply<PromptFinalState>(event, "neutrinos").particlesByPt();
_jets = apply<FastJets>(event, "jets").jetsByPt(Cuts::pT > 25*GeV && Cuts::abseta < 2.5);
// Calculate the missing ET, using the prompt neutrinos only (really?)
/// @todo Why not use MissingMomentum?
FourMomentum pmet;
for (const Particle& p : _neutrinos) pmet += p.momentum();
_met_et = pmet.pT();
_met_phi = pmet.phi();
// Check overlap of jets/leptons.
unsigned int i,j;
_jet_ntag = 0;
_overlap = false;
for (i = 0; i < _jets.size(); i++) {
const Jet& jet = _jets[i];
// If dR(el,jet) < 0.4 skip the event
for (const DressedLepton& el : _dressedelectrons) {
if (deltaR(jet, el) < 0.4) _overlap = true;
}
// If dR(mu,jet) < 0.4 skip the event
for (const DressedLepton& mu : _dressedmuons) {
if (deltaR(jet, mu) < 0.4) _overlap = true;
}
// If dR(jet,jet) < 0.5 skip the event
for (j = 0; j < _jets.size(); j++) {
const Jet& jet2 = _jets[j];
if (i == j) continue; // skip the diagonal
if (deltaR(jet, jet2) < 0.5) _overlap = true;
}
// Count the number of b-tags
if (!jet.bTags().empty()) _jet_ntag += 1;
}
// Evaluate basic event selection
unsigned int ejets_bits = 0, mujets_bits = 0;
bool pass_ejets = _ejets(ejets_bits);
bool pass_mujets = _mujets(mujets_bits);
// Remove events with object overlap
if (_overlap) vetoEvent;
// basic event selection requirements
if (!pass_ejets && !pass_mujets) vetoEvent;
// Check if the additional pT threshold requirements are passed
bool pass_jetPt = _additionalJetCuts();
// Count the jet multiplicity for 25, 40, 60 and 80GeV
unsigned int ithres, jet_n[4];
for (ithres = 0; ithres < 4; ithres++) {
jet_n[ithres] = _countJets(ithres);
}
// Fill histograms
for (unsigned int ihist = 0; ihist < 6; ihist++) {
if (ihist > 0 && !pass_jetPt) continue; // additional pT threshold cuts for pT plots
unsigned int threshLimit = _thresholdLimit(ihist);
for (ithres = 0; ithres < threshLimit; ithres++) {
if (jet_n[ithres] < 3) continue; // 3 or more jets for ljets
// Fill
if (ihist == 0) _histogram(ihist, ithres)->fill(jet_n[ithres]-2); // njets
else if (ihist == 1) _histogram(ihist, ithres)->fill(_jets[0].pT()); // leading jet pT
else if (ihist == 2) _histogram(ihist, ithres)->fill(_jets[1].pT()); // 2nd jet pT
else if (ihist == 3 && jet_n[ithres] >= 3) _histogram(ihist, ithres)->fill(_jets[2].pT()); // 3rd jet pT
else if (ihist == 4 && jet_n[ithres] >= 4) _histogram(ihist, ithres)->fill(_jets[3].pT()); // 4th jet pT
else if (ihist == 5 && jet_n[ithres] >= 5) _histogram(ihist, ithres)->fill(_jets[4].pT()); // 5th jet pT
}
}
}
void finalize() {
// Normalize to cross-section
const double norm = crossSection()/sumOfWeights();
typedef map<unsigned int, Histo1DPtr>::value_type IDtoHisto1DPtr; ///< @todo Remove when C++11 allowed
for (IDtoHisto1DPtr ihpair : _hMap) scale(ihpair.second, norm); ///< @todo Use normalize(ihpair.second, crossSection())
// Calc averages
for (unsigned int ihist = 0; ihist < _histLimit ; ihist++) {
unsigned int threshLimit = _thresholdLimit(ihist);
for (unsigned int ithres = 0; ithres < threshLimit; ithres++) {
scale(_histogram(ihist, ithres), 0.5);
}
}
}
private:
/// @name Cut helper functions
//@{
// Event selection functions
bool _ejets(unsigned int& cutBits) {
// 1. More than zero good electrons
cutBits += 1; if (_dressedelectrons.size() == 0) return false;
// 2. No additional electrons passing the veto selection
cutBits += 1 << 1; if (_vetodressedelectrons.size() > 1) return false;
// 3. No muons passing the veto selection
cutBits += 1 << 2; if (_vetodressedmuons.size() > 0) return false;
// 4. total neutrino pT > 30 GeV
cutBits += 1 << 3; if (_met_et <= 30.0*GeV) return false;
// 5. MTW > 35 GeV
cutBits += 1 << 4;
if (_transMass(_dressedelectrons[0].pT(), _dressedelectrons[0].phi(), _met_et, _met_phi) <= 35*GeV) return false;
// 6. At least one b-tagged jet
cutBits += 1 << 5; if (_jet_ntag < 1) return false;
// 7. At least three good jets
cutBits += 1 << 6; if (_jets.size() < 3) return false;
cutBits += 1 << 7;
return true;
}
bool _mujets(unsigned int& cutBits) {
// 1. More than zero good muons
cutBits += 1; if (_dressedmuons.size() == 0) return false;
// 2. No additional muons passing the veto selection
cutBits += 1 << 1; if (_vetodressedmuons.size() > 1) return false;
// 3. No electrons passing the veto selection
cutBits += 1 << 2; if (_vetodressedelectrons.size() > 0) return false;
// 4. total neutrino pT > 30 GeV
cutBits += 1 << 3; if (_met_et <= 30*GeV) return false;
// 5. MTW > 35 GeV
cutBits += 1 << 4;
if (_transMass(_dressedmuons[0].pT(), _dressedmuons[0].phi(), _met_et, _met_phi) <= 35*GeV) return false;
// 6. At least one b-tagged jet
cutBits += 1 << 5; if (_jet_ntag < 1) return false;
// 7. At least three good jets
cutBits += 1 << 6; if (_jets.size() < 3) return false;
cutBits += 1 << 7;
return true;
}
bool _additionalJetCuts() {
if (_jets.size() < 2) return false;
if (_jets[0].pT() <= 50*GeV || _jets[1].pT() <= 35*GeV) return false;
return true;
}
//@}
/// @name Histogram helper functions
//@{
unsigned int _thresholdLimit(unsigned int histId) {
if (histId == 0) return 4;
return 1;
}
Histo1DPtr _histogram(unsigned int histId, unsigned int thresholdId) {
assert(histId < _histLimit);
assert(thresholdId < _thresholdLimit(histId));
const unsigned int hInd = (histId == 0) ? thresholdId : (_thresholdLimit(0) + (histId-1) + thresholdId);
if (_hMap.find(hInd) != _hMap.end()) return _hMap[hInd];
_hMap.insert( { hInd, Histo1DPtr() } );
if (histId == 0) book(_hMap[hInd], thresholdId+1, 1, 1);
else book(_hMap[hInd], 4+histId, 1, 1);
return _hMap[hInd];
}
//@}
/// @name Physics object helper functions
//@{
double _transMass(double ptLep, double phiLep, double met, double phiMet) {
return sqrt(2.0*ptLep*met*(1 - cos(phiLep-phiMet)));
}
unsigned int _countJets(unsigned int ithres) {
if (ithres > 4) assert(0);
double pTcut[4] = {25.,40.,60.,80.};
unsigned int i, jet_n = 0;
for (i = 0; i < _jets.size(); i++) {
if (_jets[i].pT() > pTcut[ithres]) jet_n++;
}
unsigned int ncutoff[4] = {8,7,6,5};
if (jet_n > ncutoff[ithres]) jet_n = ncutoff[ithres];
return jet_n;
}
//@}
private:
/// @name Objects that are used by the event selection decisions
//@{
vector<DressedLepton> _dressedelectrons;
vector<DressedLepton> _vetodressedelectrons;
vector<DressedLepton> _dressedmuons;
vector<DressedLepton> _vetodressedmuons;
Particles _neutrinos;
Jets _jets;
unsigned int _jet_ntag;
/// @todo Why not store the whole MET FourMomentum?
double _met_et, _met_phi;
bool _overlap;
map<unsigned int, Histo1DPtr> _hMap;
//unsigned int _chanLimit;
unsigned int _histLimit;
//@}
};
// Declare the class as a hook for the plugin system
RIVET_DECLARE_PLUGIN(ATLAS_2014_I1304688);
}
|