Rivet analyses
High jet-multiplicity + MET squark and gluino search
Experiment: ATLAS (LHC)
Inspire ID: 1204314
Status: OBSOLETE
Authors: - Peter Richardson
References: - Expt page: ATLAS-CONF-2012-103 - arXiv: 1206.1760
Beams: p+ p+
Beam energies: (4000.0, 4000.0)GeV
Run details: - BSM signal events at 8000 GeV.
Search for SUSY using events with 6 or more jets in association with missing transverse momentum produced in proton-proton collisions at a centre-of-mass energy of 8 TeV. The data sample has a total integrated luminosity of 5.8 fb−1. Distributions in the W and top control regions are not produced, while in addition to the plots from the paper the count of events in the different signal regions is included. The analysis is identical to the previous 7 TeV paper.
Source
code:ATLAS_2012_CONF_2012_103.cc
// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/VisibleFinalState.hh"
#include "Rivet/Projections/VetoedFinalState.hh"
#include "Rivet/Projections/IdentifiedFinalState.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Tools/RivetMT2.hh"
namespace Rivet {
class ATLAS_2012_CONF_2012_103 : public Analysis {
public:
/// Constructor
ATLAS_2012_CONF_2012_103()
: Analysis("ATLAS_2012_CONF_2012_103")
{ }
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// projection to find the electrons
IdentifiedFinalState elecs(Cuts::abseta < 2.47 && Cuts::pT > 20*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");
// for pTmiss
declare(VisibleFinalState(Cuts::abseta < 4.9), "vfs");
VetoedFinalState vfs;
vfs.addVetoPairId(PID::MUON);
/// Jet finder
declare(FastJets(vfs, JetAlg::ANTIKT, 0.4), "AntiKtJets04");
/// Book histograms
book(_etmiss_HT_7j55 ,"etmiss_HT_7j55", 8, 0., 16.);
book(_etmiss_HT_8j55 ,"etmiss_HT_8j55", 8, 0., 16.);
book(_etmiss_HT_9j55 ,"etmiss_HT_9j55", 8, 0., 16.);
book(_etmiss_HT_6j80 ,"etmiss_HT_6j80", 8, 0., 16.);
book(_etmiss_HT_7j80 ,"etmiss_HT_7j80", 8, 0., 16.);
book(_etmiss_HT_8j80 ,"etmiss_HT_8j80", 8, 0., 16.);
book(_hist_njet55 ,"hist_njet55", 4, 5.5, 9.5);
book(_hist_njet80 ,"hist_njet80", 4, 4.5, 8.5);
book(_count_7j55 ,"count_7j55", 1, 0., 1.);
book(_count_8j55 ,"count_8j55", 1, 0., 1.);
book(_count_9j55 ,"count_9j55", 1, 0., 1.);
book(_count_6j80 ,"count_6j80", 1, 0., 1.);
book(_count_7j80 ,"count_7j80", 1, 0., 1.);
book(_count_8j80 ,"count_8j80", 1, 0., 1.);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// get the jet candidates
Jets cand_jets = apply<FastJets>(event, "AntiKtJets04").jetsByPt(Cuts::pT > 20*GeV && Cuts::abseta < 2.8);
// candidate muons
Particles cand_mu = apply<IdentifiedFinalState>(event, "muons").particlesByPt();
// candidate electrons
Particles cand_e = apply<IdentifiedFinalState>(event, "elecs").particlesByPt();
// resolve jet/lepton ambiguity
Jets recon_jets;
for ( const Jet& jet : cand_jets ) {
// candidates after |eta| < 2.8
if ( fabs( jet.eta() ) >= 2.8 ) 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 );
}
// only keep electrons more than R=0.4 from jets
Particles recon_e;
for ( const Particle & e : cand_e ) {
bool away = true;
for ( const Jet& jet : recon_jets ) {
if ( deltaR(e.momentum(),jet.momentum()) < 0.4 ) {
away = false;
break;
}
}
if ( away )
recon_e.push_back( e );
}
// only keep muons more than R=0.4 from jets
Particles recon_mu;
for ( const Particle & mu : cand_mu ) {
bool away = true;
for ( const Jet& jet : recon_jets ) {
if ( deltaR(mu.momentum(),jet.momentum()) < 0.4 ) {
away = false;
break;
}
}
if ( away )
recon_mu.push_back( mu );
}
// pTmiss
Particles vfs_particles =
apply<VisibleFinalState>(event, "vfs").particles();
FourMomentum pTmiss;
for ( const Particle & p : vfs_particles ) {
pTmiss -= p.momentum();
}
double eTmiss = pTmiss.pT();
// now only use recon_jets, recon_mu, recon_e
// reject events with electrons and muons
if ( ! ( recon_mu.empty() && recon_e.empty() ) ) {
MSG_DEBUG("Charged leptons left after selection");
vetoEvent;
}
// calculate H_T
double HT=0;
for ( const Jet& jet : recon_jets ) {
if ( jet.pT() > 40 * GeV )
HT += jet.pT() ;
}
// number of jets
unsigned int njet55=0, njet80=0;
for (unsigned int ix=0;ix<recon_jets.size();++ix) {
if(recon_jets[ix].pT()>80.*GeV) ++njet80;
if(recon_jets[ix].pT()>55.*GeV) ++njet55;
}
double ratio = eTmiss/sqrt(HT);
if(ratio>4.) {
if(njet55>9) njet55 = 9;
if(njet80>8) njet80 = 8;
_hist_njet55->fill(njet55);
_hist_njet80->fill(njet80);
// 7j55
if(njet55>=7)
_count_7j55->fill( 0.5);
// 8j55
if(njet55>=8)
_count_8j55->fill( 0.5) ;
// 8j55
if(njet55==9)
_count_9j55->fill( 0.5) ;
// 6j80
if(njet80>=6)
_count_6j80->fill( 0.5) ;
// 7j80
if(njet80>=7)
_count_7j80->fill( 0.5) ;
// 8j80
if(njet80==8)
_count_8j80->fill( 0.5) ;
}
if(njet55>=7)
_etmiss_HT_7j55->fill( ratio);
// 8j55
if(njet55>=8)
_etmiss_HT_8j55->fill( ratio) ;
// 8j55
if(njet55>=9)
_etmiss_HT_9j55->fill( ratio) ;
// 6j80
if(njet80>=6)
_etmiss_HT_6j80->fill( ratio) ;
// 7j80
if(njet80>=7)
_etmiss_HT_7j80->fill( ratio) ;
// 8j80
if(njet80>=8)
_etmiss_HT_8j80->fill( ratio) ;
}
/// @}
void finalize() {
double norm = crossSection()/femtobarn*5.8/sumOfWeights();
scale(_etmiss_HT_7j55,2.*norm);
scale(_etmiss_HT_8j55,2.*norm);
scale(_etmiss_HT_9j55,2.*norm);
scale(_etmiss_HT_6j80,2.*norm);
scale(_etmiss_HT_7j80,2.*norm);
scale(_etmiss_HT_8j80,2.*norm);
scale(_hist_njet55,norm);
scale(_hist_njet80,norm);
scale(_count_7j55,norm);
scale(_count_8j55,norm);
scale(_count_9j55,norm);
scale(_count_6j80,norm);
scale(_count_7j80,norm);
scale(_count_8j80,norm);
}
private:
/// @name Histograms
/// @{
Histo1DPtr _etmiss_HT_7j55;
Histo1DPtr _etmiss_HT_8j55;
Histo1DPtr _etmiss_HT_9j55;
Histo1DPtr _etmiss_HT_6j80;
Histo1DPtr _etmiss_HT_7j80;
Histo1DPtr _etmiss_HT_8j80;
Histo1DPtr _hist_njet55;
Histo1DPtr _hist_njet80;
Histo1DPtr _count_7j55;
Histo1DPtr _count_8j55;
Histo1DPtr _count_9j55;
Histo1DPtr _count_6j80;
Histo1DPtr _count_7j80;
Histo1DPtr _count_8j80;
/// @}
};
RIVET_DECLARE_PLUGIN(ATLAS_2012_CONF_2012_103);
}