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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/VisibleFinalState.hh"
#include "Rivet/Projections/IdentifiedFinalState.hh"
#include "Rivet/Projections/VetoedFinalState.hh"
#include "Rivet/Projections/FastJets.hh"
namespace Rivet {
class ATLAS_2012_CONF_2012_104 : public Analysis {
public:
/// Constructor
ATLAS_2012_CONF_2012_104()
: Analysis("ATLAS_2012_CONF_2012_104")
{ }
/// @name Analysis methods
//@{
/// Book histograms and initialize projections before the run
void init() {
// projection to find the electrons
IdentifiedFinalState elecs(Cuts::abseta < 2.47 && Cuts::pT > 10*GeV);
elecs.acceptIdPair(PID::ELECTRON);
declare(elecs, "elecs");
// projection to find the muons
IdentifiedFinalState muons(Cuts::abseta < 2.4 && Cuts::pT > 10*GeV);
muons.acceptIdPair(PID::MUON);
declare(muons, "muons");
// Jet finder
VetoedFinalState vfs;
vfs.addVetoPairId(PID::MUON);
declare(FastJets(vfs, FastJets::ANTIKT, 0.4), "AntiKtJets04");
// all tracks (to do deltaR with leptons)
declare(ChargedFinalState(Cuts::abseta < 3 && Cuts::pT > 0.5*GeV), "cfs");
// for pTmiss
declare(VisibleFinalState(Cuts::abseta < 4.9),"vfs");
// Book histograms
book(_count_e ,"count_e" , 1, 0., 1.);
book(_count_mu ,"count_mu", 1, 0., 1.);
book(_hist_eTmiss_e ,"hist_eTmiss_e" , 25, 0., 1000.);
book(_hist_eTmiss_mu ,"hist_eTmiss_mu" , 25, 0., 1000.);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const double weight = 1.0;
// get the candiate jets
Jets cand_jets;
for ( const Jet& jet :
apply<FastJets>(event, "AntiKtJets04").jetsByPt(20.0*GeV) ) {
if ( fabs( jet.eta() ) < 2.8 ) {
cand_jets.push_back(jet);
}
}
// get the candidate "medium" leptons without isolation
Particles cand_e;
for( const Particle & e :
apply<IdentifiedFinalState>(event, "elecs").particlesByPt()) {
// remove any leptons within 0.4 of any candidate jets
bool e_near_jet = false;
for ( const Jet& jet : cand_jets ) {
double dR = deltaR(e.momentum(),jet.momentum());
if ( dR < 0.4 && dR > 0.2 ) {
e_near_jet = true;
break;
}
}
if ( ! e_near_jet ) cand_e.push_back(e);
}
Particles cand_mu;
for( const Particle & mu :
apply<IdentifiedFinalState>(event, "muons").particlesByPt()) {
// remove any leptons within 0.4 of any candidate jets
bool mu_near_jet = false;
for ( const Jet& jet : cand_jets ) {
if ( deltaR(mu.momentum(),jet.momentum()) < 0.4 ) {
mu_near_jet = true;
break;
}
}
if ( ! mu_near_jet ) cand_mu.push_back(mu);
}
// apply the isolation
Particles chg_tracks =
apply<ChargedFinalState>(event, "cfs").particles();
// pTcone around muon track (hard)
Particles recon_mu;
for ( const Particle & mu : cand_mu ) {
double pTinCone = -mu.pT();
if(-pTinCone<25.) continue;
for ( const Particle & track : chg_tracks ) {
if ( deltaR(mu.momentum(),track.momentum()) < 0.2 )
pTinCone += track.pT();
}
if ( pTinCone < 1.8*GeV ) recon_mu.push_back(mu);
}
// pTcone around electron track (hard)
Particles recon_e;
for ( const Particle & e : cand_e ) {
double pTinCone = -e.pT();
if(-pTinCone<25.) continue;
for ( const Particle & track : chg_tracks ) {
if ( deltaR(e.momentum(),track.momentum()) < 0.2 )
pTinCone += track.pT();
}
if ( pTinCone < 0.1 * e.pT() ) recon_e.push_back(e);
}
// discard jets that overlap with electrons
Jets recon_jets;
for ( const Jet& jet : cand_jets ) {
if(jet.abseta()>2.5||
jet.perp()<25.) continue;
bool away_from_e = true;
for ( const Particle & e : cand_e ) {
if ( deltaR(e.momentum(),jet.momentum()) < 0.2 ) {
away_from_e = false;
break;
}
}
if ( away_from_e ) recon_jets.push_back( jet );
}
// pTmiss
FourMomentum pTmiss;
for ( const Particle & p :
apply<VisibleFinalState>(event, "vfs").particles() ) {
pTmiss -= p.momentum();
}
double eTmiss = pTmiss.pT();
// at least 4 jets with pT>80.
if(recon_jets.size()<4 || recon_jets[3].perp()<80.) vetoEvent;
// only 1 signal lepton
if( recon_e.size() + recon_mu.size() != 1 )
vetoEvent;
if( cand_e .size() + cand_mu .size() != 1 )
vetoEvent;
// start of meff calculation
double HT=0.;
for( const Jet & jet : recon_jets) {
double pT = jet.perp();
if(pT>40.) HT += pT;
}
// get the lepton
Particle lepton = recon_e.empty() ? recon_mu[0] : recon_e[0];
// lepton variables
double pT = lepton.perp();
double mT = 2.*(pT*eTmiss -
lepton.px()*pTmiss.px() -
lepton.py()*pTmiss.py());
mT = sqrt(mT);
HT += pT;
double m_eff_inc = HT + eTmiss + pT;
double m_eff_4 = eTmiss + pT;
for(unsigned int ix=0;ix<4;++ix)
m_eff_4 += recon_jets[ix].perp();
// four jet selecton
if(mT>100.&& eTmiss/m_eff_4>0.2 &&
m_eff_inc > 800.) {
if( eTmiss > 250. ) {
if(lepton.abspid()==PID::ELECTRON)
_count_e->fill(0.5,weight);
else if(lepton.abspid()==PID::MUON)
_count_mu->fill(0.5,weight);
}
if(lepton.abspid()==PID::ELECTRON)
_hist_eTmiss_e ->fill(eTmiss,weight);
else if(lepton.abspid()==PID::MUON)
_hist_eTmiss_mu->fill(eTmiss,weight);
}
}
//@}
void finalize() {
double norm = 5.8* crossSection()/sumOfWeights()/femtobarn;
scale(_count_e ,norm);
scale(_count_mu,norm);
scale(_hist_eTmiss_e ,40.*norm);
scale(_hist_eTmiss_mu ,40.*norm);
}
private:
/// @name Histograms
//@{
Histo1DPtr _count_e ;
Histo1DPtr _count_mu;
Histo1DPtr _hist_eTmiss_e ;
Histo1DPtr _hist_eTmiss_mu;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(ATLAS_2012_CONF_2012_104);
}
|