Rivet analyses
Single-lepton search for supersymmetry
Experiment: ATLAS (LHC)
Inspire ID: 930005
Status: OBSOLETE
Authors: none listed
References: - Expt page: ATLAS-SUSY-2011-08 - Phys. Rev.D85:012006,2012 - arXiv: 1109.6606
Beams: p+ p+
Beam energies: (3500.0, 3500.0)GeV
Run details: - BSM signal events at 7000 GeV.
Single lepton search for supersymmmetric particles by ATLAS at 7 TeV. Event counts in electron and muon signal regions are implemented as one-bin histograms. Histograms for missing transverse energy and effective mass are implemented for the two signal regions.
Source
code:ATLAS_2011_I930005.cc
// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/IdentifiedFinalState.hh"
#include "Rivet/Projections/VetoedFinalState.hh"
#include "Rivet/Projections/VisibleFinalState.hh"
namespace Rivet {
/// Single-lepton search for supersymmetry
class ATLAS_2011_I930005 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ATLAS_2011_I930005);
/// @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 > 20 * GeV);
elecs.acceptIdPair(PID::ELECTRON);
declare(elecs, "elecs");
// veto region electrons (from 2010 arXiv:1102.2357v2)
Cut vetocut = Cuts::absetaIn(1.37, 1.52);
IdentifiedFinalState veto_elecs(vetocut && Cuts::pT > 10 * GeV);
veto_elecs.acceptIdPair(PID::ELECTRON);
declare(veto_elecs, "veto_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, JetAlg::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 < 4.5), "vfs");
/// Book histograms
book(_3jl_count_mu_channel, "3jl_count_muon_channel", 1, 0., 1.);
book(_3jl_count_e_channel, "3jl_count_electron_channel", 1, 0., 1.);
book(_3jt_count_mu_channel, "3jt_count_muon_channel", 1, 0., 1.);
book(_3jt_count_e_channel, "3jt_count_electron_channel", 1, 0., 1.);
book(_3j_hist_eTmiss_e, "3j_Et_miss_e", 65, 0., 650.);
book(_3j_hist_eTmiss_mu, "3j_Et_miss_mu", 65, 0., 650.);
book(_3j_hist_mT_e, "3j_mT_e", 58, 0., 580.);
book(_3j_hist_mT_mu, "3j_mT_mu", 58, 0., 580.);
book(_3j_hist_m_eff_e, "3j_m_eff_e", 46, 0., 2300.);
book(_3j_hist_m_eff_mu, "3j_m_eff_mu", 46, 0., 2300.);
book(_3jl_hist_m_eff_e_final, "3jl_m_eff_e_final", 15, 0., 1500.);
book(_3jl_hist_m_eff_mu_final, "3jl_m_eff_mu_final", 15, 0., 1500.);
book(_3jt_hist_m_eff_e_final, "3jt_m_eff_e_final", 15, 0., 1500.);
book(_3jt_hist_m_eff_mu_final, "3jt_m_eff_mu_final", 15, 0., 1500.);
book(_4jl_count_mu_channel, "4jl_count_muon_channel", 1, 0., 1.);
book(_4jl_count_e_channel, "4jl_count_electron_channel", 1, 0., 1.);
book(_4jt_count_mu_channel, "4jt_count_muon_channel", 1, 0., 1.);
book(_4jt_count_e_channel, "4jt_count_electron_channel", 1, 0., 1.);
book(_4j_hist_eTmiss_e, "4j_Et_miss_e", 65, 0., 650.);
book(_4j_hist_eTmiss_mu, "4j_Et_miss_mu", 65, 0., 650.);
book(_4j_hist_mT_e, "4j_mT_e", 58, 0., 580.);
book(_4j_hist_mT_mu, "4j_mT_mu", 58, 0., 580.);
book(_4j_hist_m_eff_e, "4j_m_eff_e", 46, 0., 2300.);
book(_4j_hist_m_eff_mu, "4j_m_eff_mu", 46, 0., 2300.);
book(_4jl_hist_m_eff_e_final, "4jl_m_eff_e_final", 15, 0., 1500.);
book(_4jl_hist_m_eff_mu_final, "4jl_m_eff_mu_final", 15, 0., 1500.);
book(_4jt_hist_m_eff_e_final, "4jt_m_eff_e_final", 15, 0., 1500.);
book(_4jt_hist_m_eff_mu_final, "4jt_m_eff_mu_final", 15, 0., 1500.);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
Particles veto_e = apply<IdentifiedFinalState>(event, "veto_elecs").particles();
if (!veto_e.empty()) {
MSG_DEBUG("electrons in veto region");
vetoEvent;
}
Jets cand_jets = apply<FastJets>(event, "AntiKtJets04")
.jetsByPt(Cuts::pT > 20 * GeV && Cuts::abseta < 2.8);
Particles candtemp_e = apply<IdentifiedFinalState>(event, "elecs").particlesByPt();
Particles candtemp_mu = apply<IdentifiedFinalState>(event, "muons").particlesByPt();
Particles chg_tracks = apply<ChargedFinalState>(event, "cfs").particles();
Particles cand_mu;
Particles cand_e;
// pTcone around muon track
for (const Particle& mu : candtemp_mu) {
double pTinCone = -mu.pT();
for (const Particle& track : chg_tracks) {
if (deltaR(mu.momentum(), track.momentum()) < 0.2) pTinCone += track.pT();
}
if (pTinCone < 1.8 * GeV) cand_mu.push_back(mu);
}
// pTcone around electron
for (const Particle& e : candtemp_e) {
double pTinCone = -e.pT();
for (const Particle& track : chg_tracks) {
if (deltaR(e.momentum(), track.momentum()) < 0.2) pTinCone += track.pT();
}
if (pTinCone < 0.1 * e.pT()) cand_e.push_back(e);
}
// discard jets that overlap with electrons
Jets recon_jets;
for (const Jet& jet : cand_jets) {
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 consider leptons far from jet
Particles recon_e, recon_mu;
for (const Particle& e : cand_e) {
bool e_near_jet = false;
for (const Jet& jet : recon_jets) {
if (deltaR(e.momentum(), jet.momentum()) < 0.4 && deltaR(e.momentum(), jet.momentum()) > 0.2)
e_near_jet = true;
}
if (!e_near_jet) recon_e.push_back(e);
}
for (const Particle& mu : cand_mu) {
bool mu_near_jet = false;
for (const Jet& jet : recon_jets) {
if (deltaR(mu.momentum(), jet.momentum()) < 0.4) mu_near_jet = true;
}
if (!mu_near_jet) 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();
// ==================== observables ====================
// Njets
int Njets = 0;
double pTmiss_phi = pTmiss.phi();
for (const Jet& jet : recon_jets) {
if (jet.abseta() < 2.8) Njets += 1;
}
if (Njets < 3) {
MSG_DEBUG("Only " << Njets << " jets w/ eta<2.8 left");
vetoEvent;
}
Particles lepton;
if (recon_mu.empty() && recon_e.empty()) {
MSG_DEBUG("No leptons");
vetoEvent;
}
else {
for (const Particle& mu : recon_mu) lepton.push_back(mu);
for (const Particle& e : recon_e) lepton.push_back(e);
}
std::sort(lepton.begin(), lepton.end(), cmpMomByPt);
double e_id = 11;
double mu_id = 13;
// one hard leading lepton cut
if (lepton[0].abspid() == e_id && lepton[0].pT() <= 25 * GeV) {
vetoEvent;
}
else if (lepton[0].abspid() == mu_id && lepton[0].pT() <= 20 * GeV) {
vetoEvent;
}
// exactly one hard leading lepton cut
if (lepton.size() > 1) {
if (lepton[1].abspid() == e_id && lepton[1].pT() > 20 * GeV) {
vetoEvent;
}
else if (lepton[1].abspid() == mu_id && lepton[1].pT() > 10 * GeV) {
vetoEvent;
}
}
// 3JL
if (recon_jets[0].pT() > 60.0 * GeV && recon_jets[1].pT() > 25.0 * GeV
&& recon_jets[2].pT() > 25.0 * GeV && deltaPhi(pTmiss_phi, recon_jets[0].phi()) > 0.2
&& deltaPhi(pTmiss_phi, recon_jets[1].phi()) > 0.2
&& deltaPhi(pTmiss_phi, recon_jets[2].phi()) > 0.2) {
FourMomentum pT_l = lepton[0].momentum();
double dPhi = deltaPhi(pT_l.phi(), pTmiss_phi);
double mT = sqrt(2 * pT_l.pT() * eTmiss * (1 - cos(dPhi)));
double m_eff = eTmiss + pT_l.pT() + recon_jets[0].pT() + recon_jets[1].pT() + recon_jets[2].pT();
if (lepton[0].abspid() == e_id) {
_3j_hist_mT_e->fill(mT);
_3j_hist_eTmiss_e->fill(eTmiss);
_3j_hist_m_eff_e->fill(m_eff);
if (mT > 100 * GeV && eTmiss > 125 * GeV) {
_3jl_hist_m_eff_e_final->fill(m_eff);
if (m_eff > 500 * GeV && eTmiss > 0.25 * m_eff) {
_3jl_count_e_channel->fill(0.5);
}
}
}
else if (lepton[0].abspid() == mu_id) {
_3j_hist_mT_mu->fill(mT);
_3j_hist_eTmiss_mu->fill(eTmiss);
_3j_hist_m_eff_mu->fill(m_eff);
if (mT > 100 * GeV && eTmiss > 125 * GeV) {
_3jl_hist_m_eff_mu_final->fill(m_eff);
if (m_eff > 500 * GeV && eTmiss > 0.25 * m_eff) {
_3jl_count_mu_channel->fill(0.5);
}
}
}
}
// 3JT
if (recon_jets[0].pT() > 80.0 * GeV && recon_jets[1].pT() > 25.0 * GeV
&& recon_jets[2].pT() > 25.0 * GeV && deltaPhi(pTmiss_phi, recon_jets[0].phi()) > 0.2
&& deltaPhi(pTmiss_phi, recon_jets[1].phi()) > 0.2
&& deltaPhi(pTmiss_phi, recon_jets[2].phi()) > 0.2) {
FourMomentum pT_l = lepton[0].momentum();
double dPhi = deltaPhi(pT_l.phi(), pTmiss_phi);
double mT = sqrt(2 * pT_l.pT() * eTmiss * (1 - cos(dPhi)));
double m_eff = eTmiss + pT_l.pT() + recon_jets[0].pT() + recon_jets[1].pT() + recon_jets[2].pT();
if (lepton[0].abspid() == e_id) {
if (mT > 100 * GeV && eTmiss > 240 * GeV) {
_3jt_hist_m_eff_e_final->fill(m_eff);
if (m_eff > 600 * GeV && eTmiss > 0.15 * m_eff) {
_3jt_count_e_channel->fill(0.5);
}
}
}
else if (lepton[0].abspid() == mu_id) {
if (mT > 100 * GeV && eTmiss > 240 * GeV) {
_3jt_hist_m_eff_mu_final->fill(m_eff);
if (m_eff > 600 * GeV && eTmiss > 0.15 * m_eff) {
_3jt_count_mu_channel->fill(0.5);
}
}
}
}
if (Njets < 4) {
MSG_DEBUG("Only " << Njets << " jets w/ eta<2.8 left");
vetoEvent;
}
// 4JL
if (recon_jets[0].pT() > 60.0 * GeV && recon_jets[1].pT() > 25.0 * GeV
&& recon_jets[2].pT() > 25.0 * GeV && recon_jets[3].pT() > 25.0 * GeV
&& deltaPhi(pTmiss_phi, recon_jets[0].phi()) > 0.2
&& deltaPhi(pTmiss_phi, recon_jets[1].phi()) > 0.2
&& deltaPhi(pTmiss_phi, recon_jets[2].phi()) > 0.2
&& deltaPhi(pTmiss_phi, recon_jets[3].phi()) > 0.2) {
FourMomentum pT_l = lepton[0].momentum();
double dPhi = deltaPhi(pT_l.phi(), pTmiss_phi);
double mT = sqrt(2 * pT_l.pT() * eTmiss * (1 - cos(dPhi)));
double m_eff = eTmiss + pT_l.pT() + recon_jets[0].pT() + recon_jets[1].pT() + recon_jets[2].pT()
+ recon_jets[3].pT();
if (lepton[0].abspid() == e_id) {
_4j_hist_mT_e->fill(mT);
_4j_hist_eTmiss_e->fill(eTmiss);
_4j_hist_m_eff_e->fill(m_eff);
if (mT > 100 * GeV && eTmiss > 140 * GeV) {
_4jl_hist_m_eff_e_final->fill(m_eff);
if (m_eff > 300 * GeV && eTmiss > 0.3 * m_eff) {
_4jl_count_e_channel->fill(0.5);
}
}
}
// Muon channel signal region
else if (lepton[0].abspid() == mu_id) {
_4j_hist_mT_mu->fill(mT);
_4j_hist_eTmiss_mu->fill(eTmiss);
_4j_hist_m_eff_mu->fill(m_eff);
if (mT > 100 * GeV && eTmiss > 140 * GeV) {
_4jl_hist_m_eff_mu_final->fill(m_eff);
if (m_eff > 300 * GeV && eTmiss > 0.3 * m_eff) {
_4jl_count_mu_channel->fill(0.5);
}
}
}
}
// 4JT
if (recon_jets[0].pT() > 60.0 * GeV && recon_jets[1].pT() > 40.0 * GeV
&& recon_jets[2].pT() > 40.0 * GeV && recon_jets[3].pT() > 40.0 * GeV
&& deltaPhi(pTmiss_phi, recon_jets[0].phi()) > 0.2
&& deltaPhi(pTmiss_phi, recon_jets[1].phi()) > 0.2
&& deltaPhi(pTmiss_phi, recon_jets[2].phi()) > 0.2
&& deltaPhi(pTmiss_phi, recon_jets[3].phi()) > 0.2) {
FourMomentum pT_l = lepton[0].momentum();
double m_eff = eTmiss + pT_l.pT() + recon_jets[0].pT() + recon_jets[1].pT() + recon_jets[2].pT()
+ recon_jets[3].pT();
if (lepton[0].abspid() == e_id) {
if (eTmiss > 200 * GeV) {
_4jt_hist_m_eff_e_final->fill(m_eff);
if (m_eff > 500 * GeV && eTmiss > 0.15 * m_eff) {
_4jt_count_e_channel->fill(0.5);
}
}
}
// Muon channel signal region
else if (lepton[0].abspid() == mu_id) {
if (eTmiss > 200 * GeV) {
_4jt_hist_m_eff_mu_final->fill(m_eff);
if (m_eff > 500 * GeV && eTmiss > 0.15 * m_eff) {
_4jt_count_mu_channel->fill(0.5);
}
}
}
}
}
/// @}
void finalize() {
scale(_3j_hist_eTmiss_e, 10. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_3j_hist_eTmiss_mu, 10. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_3j_hist_m_eff_e, 50. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_3j_hist_m_eff_mu, 50. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_3j_hist_mT_e, 10. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_3j_hist_mT_mu, 10. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_3jl_hist_m_eff_e_final, 100. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_3jl_hist_m_eff_mu_final, 100. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_3jt_hist_m_eff_e_final, 100. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_3jt_hist_m_eff_mu_final, 100. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_4j_hist_eTmiss_e, 10. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_4j_hist_eTmiss_mu, 10. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_4j_hist_m_eff_e, 50. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_4j_hist_m_eff_mu, 50. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_4j_hist_mT_e, 10. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_4j_hist_mT_mu, 10. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_4jl_hist_m_eff_e_final, 100. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_4jl_hist_m_eff_mu_final, 100. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_4jt_hist_m_eff_e_final, 100. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
scale(_4jt_hist_m_eff_mu_final, 100. * 1.04e3 * crossSection() / picobarn / sumOfWeights());
}
private:
/// @name Histograms
/// @{
Histo1DPtr _3jl_count_e_channel;
Histo1DPtr _3jl_count_mu_channel;
Histo1DPtr _3jt_count_e_channel;
Histo1DPtr _3jt_count_mu_channel;
Histo1DPtr _3j_hist_eTmiss_e;
Histo1DPtr _3j_hist_eTmiss_mu;
Histo1DPtr _3j_hist_m_eff_e;
Histo1DPtr _3j_hist_m_eff_mu;
Histo1DPtr _3j_hist_mT_e;
Histo1DPtr _3j_hist_mT_mu;
Histo1DPtr _3jl_hist_m_eff_e_final;
Histo1DPtr _3jl_hist_m_eff_mu_final;
Histo1DPtr _3jt_hist_m_eff_e_final;
Histo1DPtr _3jt_hist_m_eff_mu_final;
Histo1DPtr _4jl_count_e_channel;
Histo1DPtr _4jl_count_mu_channel;
Histo1DPtr _4jt_count_e_channel;
Histo1DPtr _4jt_count_mu_channel;
Histo1DPtr _4j_hist_eTmiss_e;
Histo1DPtr _4j_hist_eTmiss_mu;
Histo1DPtr _4j_hist_m_eff_e;
Histo1DPtr _4j_hist_m_eff_mu;
Histo1DPtr _4j_hist_mT_e;
Histo1DPtr _4j_hist_mT_mu;
Histo1DPtr _4jl_hist_m_eff_e_final;
Histo1DPtr _4jl_hist_m_eff_mu_final;
Histo1DPtr _4jt_hist_m_eff_e_final;
Histo1DPtr _4jt_hist_m_eff_mu_final;
/// @}
};
RIVET_DECLARE_ALIASED_PLUGIN(ATLAS_2011_I930005, ATLAS_2011_S9212353);
}Aliases: - ATLAS_2011_S9212353