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/VetoedFinalState.hh"
  7#include "Rivet/Projections/IdentifiedFinalState.hh"
  8#include "Rivet/Projections/FastJets.hh"
  9#include "Rivet/Tools/RivetMT2.hh"
 10
 11namespace Rivet {
 12
 13
 14  /// High-jet-multiplicity squark and gluino search
 15  class ATLAS_2011_I939504 : public Analysis {
 16  public:
 17
 18    /// Constructor
 19    RIVET_DEFAULT_ANALYSIS_CTOR(ATLAS_2011_I939504);
 20
 21
 22    /// @name Analysis methods
 23    /// @{
 24
 25    /// Book histograms and initialise projections before the run
 26    void init() {
 27
 28      // veto region electrons
 29      Cut vetocut = Cuts::absetaIn(1.37, 1.52);
 30      IdentifiedFinalState veto_elecs(vetocut && Cuts::pT > 10*GeV);
 31      veto_elecs.acceptIdPair(PID::ELECTRON);
 32      declare(veto_elecs, "veto_elecs");
 33
 34      // projection to find the electrons
 35      IdentifiedFinalState elecs(Cuts::abseta < 2.47 && Cuts::pT > 20*GeV);
 36      elecs.acceptIdPair(PID::ELECTRON);
 37      declare(elecs, "elecs");
 38
 39      // projection to find the muons
 40      IdentifiedFinalState muons(Cuts::abseta < 2.4 && Cuts::pT > 10*GeV);
 41      muons.acceptIdPair(PID::MUON);
 42      declare(muons, "muons");
 43
 44      // for pTmiss
 45      declare(VisibleFinalState(Cuts::abseta < 4.9), "vfs");
 46
 47      VetoedFinalState vfs;
 48      vfs.addVetoPairId(PID::MUON);
 49
 50      /// Jet finder
 51      declare(FastJets(vfs, JetAlg::ANTIKT, 0.4), "AntiKtJets04");
 52
 53      // all tracks (to do deltaR with leptons)
 54      declare(ChargedFinalState(Cuts::abseta < 3), "cfs");
 55
 56      /// Book histograms
 57      book(_etmisspT_55_NJ_6_obs , 1,1,1);
 58      book(_etmisspT_55_NJ_6_bac , 1,1,2);
 59      book(_etmisspT_55_NJ_6_sig , 1,1,3);
 60      book(_etmisspT_55_NJ_7_obs ,13,1,1);
 61      book(_etmisspT_55_NJ_7_bac ,13,1,2);
 62      book(_etmisspT_55_NJ_7_sig ,13,1,3);
 63      book(_etmisspT_55_NJ_8_obs ,15,1,1);
 64      book(_etmisspT_55_NJ_8_bac ,15,1,2);
 65      book(_etmisspT_55_NJ_8_sig ,15,1,3);
 66      book(_etmisspT_80_NJ_5_obs , 2,1,1);
 67      book(_etmisspT_80_NJ_5_bac , 2,1,2);
 68      book(_etmisspT_80_NJ_5_sig , 2,1,3);
 69      book(_etmisspT_80_NJ_6_obs ,14,1,1);
 70      book(_etmisspT_80_NJ_6_bac ,14,1,2);
 71      book(_etmisspT_80_NJ_6_sig ,14,1,3);
 72      book(_etmisspT_80_NJ_7_obs ,16,1,1);
 73      book(_etmisspT_80_NJ_7_bac ,16,1,2);
 74      book(_etmisspT_80_NJ_7_sig ,16,1,3);
 75
 76      book(_njet55A_obs , 3,1,1);
 77      book(_njet55A_bac , 3,1,2);
 78      book(_njet55A_sig , 3,1,3);
 79      book(_njet55B_obs , 4,1,1);
 80      book(_njet55B_bac , 4,1,2);
 81      book(_njet55B_sig , 4,1,3);
 82      book(_njet55C_obs ,17,1,1);
 83      book(_njet55C_bac ,17,1,2);
 84      book(_njet55C_sig ,17,1,3);
 85      book(_njet80A_obs , 5,1,1);
 86      book(_njet80A_bac , 5,1,2);
 87      book(_njet80A_sig , 5,1,3);
 88      book(_njet80B_obs , 6,1,1);
 89      book(_njet80B_bac , 6,1,2);
 90      book(_njet80B_sig , 6,1,3);
 91      book(_njet80C_obs ,18,1,1);
 92      book(_njet80C_bac ,18,1,2);
 93      book(_njet80C_sig ,18,1,3);
 94
 95      book(_count_7j55 ,"count_7j55", 1, 0., 1.);
 96      book(_count_8j55 ,"count_8j55", 1, 0., 1.);
 97      book(_count_6j80 ,"count_6j80", 1, 0., 1.);
 98      book(_count_7j80 ,"count_7j80", 1, 0., 1.);
 99
100    }
101
102
103    /// Perform the per-event analysis
104    void analyze(const Event& event) {
105      // apply electron veto region
106      Particles veto_e
107        = apply<IdentifiedFinalState>(event, "veto_elecs").particles();
108      if ( ! veto_e.empty() ) {
109        MSG_DEBUG("electrons in veto region");
110        vetoEvent;
111      }
112
113      // get the jet candidates
114      Jets cand_jets = apply<FastJets>(event, "AntiKtJets04").jetsByPt(Cuts::pT > 20.0*GeV && Cuts::abseta < 4.9);
115
116      // candidate muons
117      Particles cand_mu;
118      Particles chg_tracks =
119        apply<ChargedFinalState>(event, "cfs").particles();
120      for ( const Particle & mu :
121                apply<IdentifiedFinalState>(event, "muons").particlesByPt() ) {
122        double pTinCone = -mu.pT();
123        for ( const Particle & track : chg_tracks ) {
124          if ( deltaR(mu.momentum(),track.momentum()) <= 0.2 )
125            pTinCone += track.pT();
126        }
127        if ( pTinCone < 1.8*GeV )
128          cand_mu.push_back(mu);
129      }
130
131      // candidate electrons
132
133      Particles cand_e  =
134        apply<IdentifiedFinalState>(event, "elecs").particlesByPt();
135
136      // resolve jet/lepton ambiguity
137      Jets cand_jets_2;
138      for ( const Jet& jet : cand_jets ) {
139        // candidates above eta=2.8 are jets
140        if ( fabs( jet.eta() ) >= 2.8 )
141          cand_jets_2.push_back( jet );
142        // otherwise more the R=0.2 from an electrons
143        else {
144          bool away_from_e = true;
145          for ( const Particle & e : cand_e ) {
146            if ( deltaR(e.momentum(),jet.momentum()) <= 0.2 ) {
147              away_from_e = false;
148              break;
149            }
150          }
151          if ( away_from_e )
152            cand_jets_2.push_back( jet );
153        }
154      }
155
156      // only keep electrons more than R=0.4 from jets
157      Particles recon_e;
158      for ( const Particle & e : cand_e ) {
159        bool away = true;
160        for ( const Jet& jet : cand_jets_2 ) {
161          if ( deltaR(e.momentum(),jet.momentum()) < 0.4 ) {
162            away = false;
163            break;
164          }
165        }
166        if ( away )
167          recon_e.push_back( e );
168      }
169
170      // only keep muons more than R=0.4 from jets
171      Particles recon_mu;
172      for ( const Particle & mu : cand_mu ) {
173        bool away = true;
174        for ( const Jet& jet : cand_jets_2 ) {
175          if ( deltaR(mu.momentum(),jet.momentum()) < 0.4 ) {
176            away = false;
177            break;
178          }
179        }
180        if ( away ) recon_mu.push_back( mu );
181      }
182
183      // pTmiss
184      Particles vfs_particles =
185        apply<VisibleFinalState>(event, "vfs").particles();
186      FourMomentum pTmiss;
187      for ( const Particle & p : vfs_particles ) {
188        pTmiss -= p.momentum();
189      }
190      double eTmiss = pTmiss.pT();
191
192      // final jet filter
193      Jets recon_jets;
194      for (const Jet& jet : cand_jets_2) {
195        if (jet.abseta() <= 2.8 ) recon_jets.push_back( jet );
196      }
197
198      // now only use recon_jets, recon_mu, recon_e
199
200      // reject events with electrons and muons
201      if ( ! ( recon_mu.empty() && recon_e.empty() ) ) {
202        MSG_DEBUG("Charged leptons left after selection");
203        vetoEvent;
204      }
205
206      // calculate H_T
207      double HT = 0;
208      for (const Jet& jet : recon_jets) {
209        if (jet.pT() > 40*GeV) HT += jet.pT() ;
210      }
211
212      // number of jets and deltaR
213      bool pass55DeltaR=true, pass80DeltaR=true;
214      size_t njet55=0, njet80=0;
215      for (size_t ix=0; ix < recon_jets.size(); ++ix) {
216        if (recon_jets[ix].pT() > 80*GeV) ++njet80;
217        if (recon_jets[ix].pT() > 55*GeV) ++njet55;
218        for (size_t iy = ix + 1; iy < recon_jets.size(); ++iy) {
219          if (recon_jets[ix].pT() > 55*GeV &&
220              recon_jets[iy].pT() > 55*GeV &&
221              deltaR(recon_jets[ix], recon_jets[iy]) < 0.6)
222            pass55DeltaR = false;
223          // if (recon_jets[ix].pT() > 80*GeV &&
224          //     recon_jets[iy].pT() > 80*GeV &&
225          //     deltaR(recon_jets[ix], recon_jets[iy]) < 0.6)
226          //   pass80DeltaR = false;
227        }
228      }
229
230      // require at least four jets with et > 55
231      if (njet55 <= 3) vetoEvent;
232
233      // plots of etmiss/ht
234      double etht = eTmiss/sqrt(HT);
235      if (njet55 == 6) {
236        _etmisspT_55_NJ_6_obs->fill(etht);
237        _etmisspT_55_NJ_6_bac->fill(etht);
238        _etmisspT_55_NJ_6_sig->fill(etht);
239      } else if (njet55 == 7) {
240        _etmisspT_55_NJ_7_obs->fill(etht);
241        _etmisspT_55_NJ_7_bac->fill(etht);
242        _etmisspT_55_NJ_7_sig->fill(etht);
243      } else if (njet55 == 8) {
244        _etmisspT_55_NJ_8_obs->fill(etht);
245        _etmisspT_55_NJ_8_bac->fill(etht);
246        _etmisspT_55_NJ_8_sig->fill(etht);
247      }
248      if (njet80 == 5) {
249        _etmisspT_80_NJ_5_obs->fill(etht);
250        _etmisspT_80_NJ_5_bac->fill(etht);
251        _etmisspT_80_NJ_5_sig->fill(etht);
252      } else if (njet80 == 6) {
253        _etmisspT_80_NJ_6_obs->fill(etht);
254        _etmisspT_80_NJ_6_bac->fill(etht);
255        _etmisspT_80_NJ_6_sig->fill(etht);
256      } else if (njet80 == 7) {
257        _etmisspT_80_NJ_7_obs->fill(etht);
258        _etmisspT_80_NJ_7_bac->fill(etht);
259        _etmisspT_80_NJ_7_sig->fill(etht);
260      }
261
262      if (etht > 1.5 && etht < 2.) {
263        if (njet55 > 3) {
264          _njet55A_obs->fill(njet55);
265          _njet55A_bac->fill(njet55);
266          _njet55A_sig->fill(njet55);
267        }
268        if (njet80 > 3) {
269          _njet80A_obs->fill(njet80);
270          _njet80A_bac->fill(njet80);
271          _njet80A_sig->fill(njet80);
272        }
273      } else if (etht > 2. && etht < 3.) {
274        if (njet55 > 3) {
275          _njet55B_obs->fill(njet55);
276          _njet55B_bac->fill(njet55);
277          _njet55B_sig->fill(njet55);
278        }
279        if (njet80 > 3) {
280          _njet80B_obs->fill(njet80);
281          _njet80B_bac->fill(njet80);
282          _njet80B_sig->fill(njet80);
283        }
284      } else {
285        if (njet55 > 3) {
286          _njet55C_obs->fill(njet55);
287          _njet55C_bac->fill(njet55);
288          _njet55C_sig->fill(njet55);
289        }
290        if (njet80 > 3) {
291          _njet80C_obs->fill(njet80);
292          _njet80C_bac->fill(njet80);
293          _njet80C_sig->fill(njet80);
294        }
295      }
296
297      // apply E_T/sqrt(H_T) cut
298      if (etht <= 3.5*GeV) {
299        MSG_DEBUG("Fails ET/sqrt(HT) cut ");
300        vetoEvent;
301      }
302
303      // check passes at least one delta5/ njet number cut
304      if (!(pass55DeltaR && njet55 >= 7) && !(pass80DeltaR && njet80 >= 6) ) {
305        MSG_DEBUG("Fails DeltaR cut or jet number cuts");
306        vetoEvent;
307      }
308
309      // 7j55
310      if (njet55 >= 7 && pass55DeltaR) _count_7j55->fill( 0.5);
311      // 8j55
312      if (njet55 >= 8 && pass55DeltaR) _count_8j55->fill( 0.5);
313      // 6j80
314      if (njet80 >= 6 && pass80DeltaR) _count_6j80->fill( 0.5);
315      // 7j80
316      if (njet80 >= 7 && pass80DeltaR) _count_7j80->fill( 0.5);
317    }
318
319    /// @}
320
321    void finalize() {
322      const double norm = crossSection()/femtobarn*1.34/sumOfWeights();
323      scale(_etmisspT_55_NJ_6_obs,norm);
324      scale(_etmisspT_55_NJ_6_bac,norm);
325      scale(_etmisspT_55_NJ_6_sig,norm);
326      scale(_etmisspT_55_NJ_7_obs,norm);
327      scale(_etmisspT_55_NJ_7_bac,norm);
328      scale(_etmisspT_55_NJ_7_sig,norm);
329      scale(_etmisspT_55_NJ_8_obs,norm);
330      scale(_etmisspT_55_NJ_8_bac,norm);
331      scale(_etmisspT_55_NJ_8_sig,norm);
332      scale(_etmisspT_80_NJ_5_obs,norm);
333      scale(_etmisspT_80_NJ_5_bac,norm);
334      scale(_etmisspT_80_NJ_5_sig,norm);
335      scale(_etmisspT_80_NJ_6_obs,norm);
336      scale(_etmisspT_80_NJ_6_bac,norm);
337      scale(_etmisspT_80_NJ_6_sig,norm);
338      scale(_etmisspT_80_NJ_7_obs,norm);
339      scale(_etmisspT_80_NJ_7_bac,norm);
340      scale(_etmisspT_80_NJ_7_sig,norm);
341      scale(_njet55A_obs,norm);
342      scale(_njet55A_bac,norm);
343      scale(_njet55A_sig,norm);
344      scale(_njet55B_obs,norm);
345      scale(_njet55B_bac,norm);
346      scale(_njet55B_sig,norm);
347      scale(_njet55C_obs,norm);
348      scale(_njet55C_bac,norm);
349      scale(_njet55C_sig,norm);
350      scale(_njet80A_obs,norm);
351      scale(_njet80A_bac,norm);
352      scale(_njet80A_sig,norm);
353      scale(_njet80B_obs,norm);
354      scale(_njet80B_bac,norm);
355      scale(_njet80B_sig,norm);
356      scale(_njet80C_obs,norm);
357      scale(_njet80C_bac,norm);
358      scale(_njet80C_sig,norm);
359      scale(_count_7j55,norm);
360      scale(_count_8j55,norm);
361      scale(_count_6j80,norm);
362      scale(_count_7j80,norm);
363    }
364
365  private:
366
367    /// @name Histograms
368    /// @{
369    Histo1DPtr _etmisspT_55_NJ_6_obs;
370    Histo1DPtr _etmisspT_55_NJ_6_bac;
371    Histo1DPtr _etmisspT_55_NJ_6_sig;
372    Histo1DPtr _etmisspT_55_NJ_7_obs;
373    Histo1DPtr _etmisspT_55_NJ_7_bac;
374    Histo1DPtr _etmisspT_55_NJ_7_sig;
375    Histo1DPtr _etmisspT_55_NJ_8_obs;
376    Histo1DPtr _etmisspT_55_NJ_8_bac;
377    Histo1DPtr _etmisspT_55_NJ_8_sig;
378    Histo1DPtr _etmisspT_80_NJ_5_obs;
379    Histo1DPtr _etmisspT_80_NJ_5_bac;
380    Histo1DPtr _etmisspT_80_NJ_5_sig;
381    Histo1DPtr _etmisspT_80_NJ_6_obs;
382    Histo1DPtr _etmisspT_80_NJ_6_bac;
383    Histo1DPtr _etmisspT_80_NJ_6_sig;
384    Histo1DPtr _etmisspT_80_NJ_7_obs;
385    Histo1DPtr _etmisspT_80_NJ_7_bac;
386    Histo1DPtr _etmisspT_80_NJ_7_sig;
387    Histo1DPtr _njet55A_obs;
388    Histo1DPtr _njet55A_bac;
389    Histo1DPtr _njet55A_sig;
390    Histo1DPtr _njet55B_obs;
391    Histo1DPtr _njet55B_bac;
392    Histo1DPtr _njet55B_sig;
393    Histo1DPtr _njet55C_obs;
394    Histo1DPtr _njet55C_bac;
395    Histo1DPtr _njet55C_sig;
396    Histo1DPtr _njet80A_obs;
397    Histo1DPtr _njet80A_bac;
398    Histo1DPtr _njet80A_sig;
399    Histo1DPtr _njet80B_obs;
400    Histo1DPtr _njet80B_bac;
401    Histo1DPtr _njet80B_sig;
402    Histo1DPtr _njet80C_obs;
403    Histo1DPtr _njet80C_bac;
404    Histo1DPtr _njet80C_sig;
405    Histo1DPtr _count_7j55;
406    Histo1DPtr _count_8j55;
407    Histo1DPtr _count_6j80;
408    Histo1DPtr _count_7j80;
409    /// @}
410
411  };
412
413
414
415  RIVET_DECLARE_ALIASED_PLUGIN(ATLAS_2011_I939504, ATLAS_2011_S9225137);
416
417}