1// -*- C++ -*-
  2#include "Rivet/Analysis.hh"
  3#include "Rivet/Projections/FinalState.hh"
  4#include "Rivet/Projections/ChargedFinalState.hh"
  5#include "Rivet/Projections/VisibleFinalState.hh"
  6#include "Rivet/Projections/IdentifiedFinalState.hh"
  7#include "Rivet/Projections/FastJets.hh"
  8#include "Rivet/Projections/VetoedFinalState.hh"
  9
 10namespace Rivet {
 11
 12
 13
 14  /// @author Peter Richardson
 15  class ATLAS_2012_I1125961 : public Analysis {
 16  public:
 17
 18    /// Constructor
 19    ATLAS_2012_I1125961()
 20      : Analysis("ATLAS_2012_I1125961")
 21    {    }
 22
 23
 24    /// @name Analysis methods
 25    /// @{
 26
 27    /// Book histograms and initialise projections before the run
 28    void init() {
 29
 30      // Projection to find the electrons
 31      IdentifiedFinalState elecs(Cuts::abseta < 2.47 && Cuts::pT > 20*GeV);
 32      elecs.acceptIdPair(PID::ELECTRON);
 33      declare(elecs, "elecs");
 34
 35      // Projection to find the muons
 36      IdentifiedFinalState muons(Cuts::abseta < 2.4 && Cuts::pT > 10*GeV);
 37      muons.acceptIdPair(PID::MUON);
 38      declare(muons, "muons");
 39
 40      // Jet finder
 41      VetoedFinalState vfs;
 42      vfs.addVetoPairId(PID::MUON);
 43      declare(FastJets(vfs, JetAlg::ANTIKT, 0.4), "AntiKtJets04");
 44
 45      // All tracks (to do deltaR with leptons)
 46      declare(ChargedFinalState(Cuts::abseta < 3.0), "cfs");
 47
 48      // Used for pTmiss (N.B. the real 'vfs' extends beyond 4.5 to |eta| = 4.9)
 49      declare(VisibleFinalState(Cuts::abseta < 4.5), "vfs");
 50
 51      // Book histograms
 52      book(_count_A_tight   ,"count_A_tight"   , 1, 0., 1.);
 53      book(_count_A_medium  ,"count_A_medium"  , 1, 0., 1.);
 54      book(_count_Ap_medium ,"count_Ap_medium" , 1, 0., 1.);
 55      book(_count_B_tight   ,"count_B_tight"   , 1, 0., 1.);
 56      book(_count_C_tight   ,"count_C_tight"   , 1, 0., 1.);
 57      book(_count_C_medium  ,"count_C_medium"  , 1, 0., 1.);
 58      book(_count_C_loose   ,"count_C_loose"   , 1, 0., 1.);
 59      book(_count_D_tight   ,"count_D_tight"   , 1, 0., 1.);
 60      book(_count_E_tight   ,"count_E_tight"   , 1, 0., 1.);
 61      book(_count_E_medium  ,"count_E_medium"  , 1, 0., 1.);
 62      book(_count_E_loose   ,"count_E_loose"   , 1, 0., 1.);
 63
 64      book(_hist_meff_A  ,"hist_m_eff_A" , 30, 0., 3000.);
 65      book(_hist_meff_Ap ,"hist_m_eff_Ap", 30, 0., 3000.);
 66      book(_hist_meff_B  ,"hist_m_eff_B" , 30, 0., 3000.);
 67      book(_hist_meff_C  ,"hist_m_eff_C" , 30, 0., 3000.);
 68      book(_hist_meff_D  ,"hist_m_eff_D" , 30, 0., 3000.);
 69      book(_hist_meff_E  ,"hist_m_eff_E" , 30, 0., 3000.);
 70
 71    }
 72
 73
 74    /// Perform the per-event analysis
 75    void analyze(const Event& event) {
 76
 77      Jets cand_jets = apply<FastJets>(event, "AntiKtJets04").jetsByPt(Cuts::pT > 20*GeV && Cuts::abseta < 4.9);
 78
 79      const Particles cand_e  = apply<IdentifiedFinalState>(event, "elecs").particlesByPt();
 80
 81      // Muon isolation not mentioned in hep-exp 1109.6572 but assumed to still be applicable
 82      Particles cand_mu;
 83      const Particles chg_tracks = apply<ChargedFinalState>(event, "cfs").particles();
 84      const Particles muons = apply<IdentifiedFinalState>(event, "muons").particlesByPt();
 85      for (const Particle& mu : muons) {
 86        double pTinCone = -mu.pT();
 87        for (const Particle& track : chg_tracks) {
 88          if ( deltaR(mu.momentum(),track.momentum()) <= 0.2 ) {
 89            pTinCone += track.pT();
 90          }
 91        }
 92        if ( pTinCone < 1.8*GeV ) cand_mu.push_back(mu);
 93      }
 94
 95      // Resolve jet-lepton overlap for jets with |eta| < 2.8
 96      Jets recon_jets;
 97      for ( const Jet& jet : cand_jets ) {
 98        if ( fabs( jet.eta() ) >= 2.8 ) continue;
 99        bool away_from_e = true;
100        for ( const Particle & e : cand_e ) {
101          if ( deltaR(e.momentum(),jet.momentum()) <= 0.2 ) {
102            away_from_e = false;
103            break;
104          }
105        }
106        if ( away_from_e ) recon_jets.push_back( jet );
107      }
108
109      Particles recon_e, recon_mu;
110
111      for ( const Particle & e : cand_e ) {
112        bool away = true;
113        for ( const Jet& jet : recon_jets ) {
114          if ( deltaR(e.momentum(),jet.momentum()) < 0.4 ) {
115            away = false;
116            break;
117          }
118        }
119        if ( away ) recon_e.push_back( e );
120      }
121
122      for ( const Particle & mu : cand_mu ) {
123        bool away = true;
124        for ( const Jet& jet : recon_jets ) {
125          if ( deltaR(mu.momentum(),jet.momentum()) < 0.4 ) {
126            away = false;
127            break;
128          }
129        }
130        if ( away ) recon_mu.push_back( mu );
131      }
132
133      // pTmiss
134      // Based on all candidate electrons, muons and jets, plus everything else with |eta| < 4.5
135      // i.e. everything in our projection "vfs" plus the jets with |eta| > 4.5
136      Particles vfs_particles = apply<VisibleFinalState>(event, "vfs").particles();
137      FourMomentum pTmiss;
138      for ( const Particle & p : vfs_particles ) {
139        pTmiss -= p.momentum();
140      }
141      for ( const Jet& jet : cand_jets ) {
142        if ( fabs( jet.eta() ) > 4.5 ) pTmiss -= jet.momentum();
143      }
144      double eTmiss = pTmiss.pT();
145
146      // no electron pT> 20 or muons pT>10
147      if ( !recon_mu.empty() || !recon_e.empty() ) {
148        MSG_DEBUG("Charged leptons left after selection");
149        vetoEvent;
150      }
151
152      if ( eTmiss <= 160 * GeV ) {
153        MSG_DEBUG("Not enough eTmiss: " << eTmiss << " < 130");
154        vetoEvent;
155      }
156
157      if ( recon_jets.size()<2 ||
158           recon_jets[0].pT() <= 130.0 * GeV ||
159           recon_jets[0].pT() <=  60.0 * GeV ) {
160        MSG_DEBUG("No hard leading jet in " << recon_jets.size() << " jets");
161        vetoEvent;
162      }
163
164      // ==================== observables ====================
165
166      int Njets = 0;
167      double min_dPhi_All = 999.999;
168      double min_dPhi_2   = 999.999;
169      double min_dPhi_3   = 999.999;
170      double pTmiss_phi = pTmiss.phi();
171      for ( const Jet& jet : recon_jets ) {
172        if ( jet.pT() < 40 * GeV ) continue;
173        if ( Njets < 2 ) {
174          min_dPhi_2 = min( min_dPhi_2, deltaPhi( pTmiss_phi, jet.phi() ) );
175        }
176        if( Njets < 3) {
177          min_dPhi_3 = min( min_dPhi_3, deltaPhi( pTmiss_phi, jet.phi() ) );
178        }
179        min_dPhi_All = min( min_dPhi_All, deltaPhi( pTmiss_phi, jet.phi() ) );
180        ++Njets;
181      }
182
183      // inclusive meff
184      double m_eff_inc =  eTmiss;
185      for ( const Jet& jet : recon_jets ) {
186        double perp =  jet.pT();
187        if(perp>40.) m_eff_inc += perp;
188      }
189
190      // region A
191      double m_eff_Nj = eTmiss + recon_jets[0].pT() + recon_jets[1].pT();
192      if( min_dPhi_2 > 0.4 && eTmiss/m_eff_Nj > 0.3 ) {
193        _hist_meff_A->fill(m_eff_inc);
194        if(m_eff_inc>1900.) _count_A_tight ->fill(0.5);
195        if(m_eff_inc>1400.) _count_A_medium->fill(0.5);
196      }
197
198      // region A'
199      if( min_dPhi_2 > 0.4 && eTmiss/m_eff_Nj > 0.4 ) {
200        _hist_meff_Ap->fill(m_eff_inc);
201        if(m_eff_inc>1200.) _count_Ap_medium->fill(0.5);
202      }
203
204      // for rest of regions 3 jets pT> 60 needed
205      if(recon_jets.size()<3 || recon_jets[2].perp()<60.)
206        vetoEvent;
207
208      // region B
209      m_eff_Nj +=  recon_jets[2].perp();
210      if( min_dPhi_3 > 0.4 && eTmiss/m_eff_Nj > 0.25 ) {
211        _hist_meff_B->fill(m_eff_inc);
212        if(m_eff_inc>1900.) _count_B_tight ->fill(0.5);
213      }
214
215      // for rest of regions 4 jets pT> 60 needed
216      if(recon_jets.size()<4 || recon_jets[3].perp()<60.)
217        vetoEvent;
218
219      // region C
220      m_eff_Nj +=  recon_jets[3].perp();
221      if( min_dPhi_3 > 0.4 && min_dPhi_All > 0.2 && eTmiss/m_eff_Nj > 0.25 ) {
222        _hist_meff_C->fill(m_eff_inc);
223        if(m_eff_inc>1500.) _count_C_tight ->fill(0.5);
224        if(m_eff_inc>1200.) _count_C_medium->fill(0.5);
225        if(m_eff_inc> 900.) _count_C_loose ->fill(0.5);
226      }
227
228      // for rest of regions 5 jets pT> 40 needed
229      if(recon_jets.size()<5 || recon_jets[4].perp()<40.)
230        vetoEvent;
231
232      // region D
233      m_eff_Nj +=  recon_jets[4].perp();
234      if( min_dPhi_3 > 0.4 && min_dPhi_All > 0.2 && eTmiss/m_eff_Nj > 0.2 ) {
235        _hist_meff_D->fill(m_eff_inc);
236        if(m_eff_inc>1500.) _count_D_tight ->fill(0.5);
237      }
238
239      // for rest of regions 6 jets pT> 40 needed
240      if(recon_jets.size()<6 || recon_jets[5].perp()<40.)
241        vetoEvent;
242
243      // region E
244      m_eff_Nj +=  recon_jets[5].perp();
245      if( min_dPhi_3 > 0.4 && min_dPhi_All > 0.2 && eTmiss/m_eff_Nj > 0.15 ) {
246        _hist_meff_E->fill(m_eff_inc);
247        if(m_eff_inc>1400.) _count_E_tight ->fill(0.5);
248        if(m_eff_inc>1200.) _count_E_medium->fill(0.5);
249        if(m_eff_inc> 900.) _count_E_loose ->fill(0.5);
250      }
251    }
252
253
254    void finalize() {
255
256      double norm = crossSection()/femtobarn*4.7/sumOfWeights();
257      // these are number of events at 4.7fb^-1 per 100 GeV
258      scale( _hist_meff_A , 100. * norm );
259      scale( _hist_meff_Ap, 100. * norm );
260      scale( _hist_meff_B , 100. * norm );
261      scale( _hist_meff_C , 100. * norm );
262      scale( _hist_meff_D , 100. * norm );
263      scale( _hist_meff_E , 100. * norm );
264      // these are number of events at 4.7fb^-1
265      scale(_count_A_tight  ,norm);
266      scale(_count_A_medium ,norm);
267      scale(_count_Ap_medium,norm);
268      scale(_count_B_tight  ,norm);
269      scale(_count_C_tight  ,norm);
270      scale(_count_C_medium ,norm);
271      scale(_count_C_loose  ,norm);
272      scale(_count_D_tight  ,norm);
273      scale(_count_E_tight  ,norm);
274      scale(_count_E_medium ,norm);
275      scale(_count_E_loose  ,norm);
276    }
277
278    /// @}
279
280
281  private:
282
283    Histo1DPtr _count_A_tight;
284    Histo1DPtr _count_A_medium;
285    Histo1DPtr _count_Ap_medium;
286    Histo1DPtr _count_B_tight;
287    Histo1DPtr _count_C_tight;
288    Histo1DPtr _count_C_medium;
289    Histo1DPtr _count_C_loose;
290    Histo1DPtr _count_D_tight;
291    Histo1DPtr _count_E_tight;
292    Histo1DPtr _count_E_medium;
293    Histo1DPtr _count_E_loose;
294
295    Histo1DPtr _hist_meff_A ;
296    Histo1DPtr _hist_meff_Ap;
297    Histo1DPtr _hist_meff_B ;
298    Histo1DPtr _hist_meff_C ;
299    Histo1DPtr _hist_meff_D ;
300    Histo1DPtr _hist_meff_E ;
301
302  };
303
304
305  RIVET_DECLARE_PLUGIN(ATLAS_2012_I1125961);
306
307}