MC_ZZJETS.cc

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// -*- C++ -*-
#include "Rivet/Analyses/MC_JetAnalysis.hh"
#include "Rivet/Projections/ZFinder.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Projections/VetoedFinalState.hh"
#include "Rivet/Tools/Logging.hh"
#include "Rivet/Tools/ParticleIdUtils.hh"
#include "Rivet/RivetAIDA.hh"

namespace Rivet {

  /// @brief MC validation analysis for Z[ee]Z[mumu] + jets events
  class MC_ZZJETS : public MC_JetAnalysis {
  public:

    /// Default constructor
    MC_ZZJETS()
      : MC_JetAnalysis("MC_ZZJETS", 4, "Jets")
    {
      setNeedsCrossSection(true);
    }


    /// @name Analysis methods
    //@{

    /// Book histograms
    void init() {
      ZFinder zeefinder(-3.5, 3.5, 25.0*GeV, ELECTRON, 65.0*GeV, 115.0*GeV, 0.2, true, true);
      addProjection(zeefinder, "ZeeFinder");
      ZFinder zmmfinder(-3.5, 3.5, 25.0*GeV, MUON, 65.0*GeV, 115.0*GeV, 0.2, true, true);
      addProjection(zmmfinder, "ZmmFinder");
      VetoedFinalState jetinput;
      jetinput
          .addVetoOnThisFinalState(zeefinder)
          .addVetoOnThisFinalState(zmmfinder);
      FastJets jetpro(jetinput, FastJets::KT, 0.7);
      addProjection(jetpro, "Jets");

      // properties of the pair momentum
      _h_ZZ_pT = bookHistogram1D("ZZ_pT", logBinEdges(100, 1.0, 0.5*sqrtS()));
      _h_ZZ_pT_peak = bookHistogram1D("ZZ_pT_peak", 25, 0.0, 25.0);
      _h_ZZ_eta = bookHistogram1D("ZZ_eta", 40, -7.0, 7.0);
      _h_ZZ_phi = bookHistogram1D("ZZ_phi", 25, 0.0, TWOPI);
      _h_ZZ_m = bookHistogram1D("ZZ_m", logBinEdges(100, 150.0, 180.0+0.25*sqrtS()));

      // correlations between the ZZ
      _h_ZZ_dphi = bookHistogram1D("ZZ_dphi", 25, 0.0, PI);  /// @todo non-linear?
      _h_ZZ_deta = bookHistogram1D("ZZ_deta", 25, -7.0, 7.0);
      _h_ZZ_dR = bookHistogram1D("ZZ_dR", 25, 0.5, 7.0);
      _h_ZZ_dpT = bookHistogram1D("ZZ_dpT", logBinEdges(100, 1.0, 0.5*sqrtS()));
      _h_ZZ_costheta_planes = bookHistogram1D("ZZ_costheta_planes", 25, -1.0, 1.0);

      /// @todo fuer WW: missing ET

      // properties of the Z bosons
      _h_Z_pT = bookHistogram1D("Z_pT", logBinEdges(100, 10.0, 0.25*sqrtS()));
      _h_Z_eta = bookHistogram1D("Z_eta", 70, -7.0, 7.0);

      // properties of the leptons
      _h_Zl_pT = bookHistogram1D("Zl_pT", logBinEdges(100, 30.0, 0.1
                                                      *sqrtS()));
      _h_Zl_eta = bookHistogram1D("Zl_eta", 40, -3.5, 3.5);

      // correlations between the opposite charge leptons
      _h_ZeZm_dphi = bookHistogram1D("ZeZm_dphi", 25, 0.0, PI);
      _h_ZeZm_deta = bookHistogram1D("ZeZm_deta", 25, -5.0, 5.0);
      _h_ZeZm_dR = bookHistogram1D("ZeZm_dR", 25, 0.5, 5.0);
      _h_ZeZm_m = bookHistogram1D("ZeZm_m", 100, 0.0, 300.0);

      // correlations with jets
      _h_ZZ_jet1_deta = bookHistogram1D("ZZ_jet1_deta", 70, -7.0, 7.0);
      _h_ZZ_jet1_dR = bookHistogram1D("ZZ_jet1_dR", 25, 1.5, 7.0);
      _h_Ze_jet1_dR = bookHistogram1D("Ze_jet1_dR", 25, 0.0, 7.0);

      // global stuff
      _h_HT = bookHistogram1D("HT", logBinEdges(100, 100.0, 0.5*sqrtS()));

      MC_JetAnalysis::init();
    }



    /// Do the analysis
    void analyze(const Event & e) {
      const double weight = e.weight();

      const ZFinder& zeefinder = applyProjection<ZFinder>(e, "ZeeFinder");
      if (zeefinder.bosons().size()!=1) {
        vetoEvent;
      }

      const ZFinder& zmmfinder = applyProjection<ZFinder>(e, "ZmmFinder");
      if (zmmfinder.bosons().size()!=1) {
        vetoEvent;
      }

      FourMomentum zee(zeefinder.bosons()[0].momentum());
      FourMomentum zmm(zmmfinder.bosons()[0].momentum());
      FourMomentum zz(zee+zmm);
      // find leptons
      FourMomentum ep(0.0,0.0,0.0,0.0), em(0.0,0.0,0.0,0.0);
      if (PID::threeCharge(zeefinder.constituents()[0])>0.0) {
        ep=zeefinder.constituents()[0].momentum();
        em=zeefinder.constituents()[1].momentum();
      }
      else {
        ep=zeefinder.constituents()[1].momentum();
        em=zeefinder.constituents()[0].momentum();
      }
      FourMomentum mp(0.0,0.0,0.0,0.0), mm(0.0,0.0,0.0,0.0);
      if (PID::threeCharge(zmmfinder.constituents()[0])>0.0) {
        mp=zmmfinder.constituents()[0].momentum();
        mm=zmmfinder.constituents()[1].momentum();
      }
      else {
        mp=zmmfinder.constituents()[1].momentum();
        mm=zmmfinder.constituents()[0].momentum();
      }

      _h_ZZ_pT->fill(zz.pT(),weight);
      _h_ZZ_pT_peak->fill(zz.pT(),weight);
      _h_ZZ_eta->fill(zz.eta(),weight);
      _h_ZZ_phi->fill(zz.azimuthalAngle(),weight);
      double mzz2=zz.mass2();
      if (mzz2>0.0) _h_ZZ_m->fill(sqrt(mzz2), weight);

      _h_ZZ_dphi->fill(mapAngle0ToPi(zee.phi()-zmm.phi()), weight);
      _h_ZZ_deta->fill(zee.eta()-zmm.eta(), weight);
      _h_ZZ_dR->fill(deltaR(zee,zmm), weight);
      _h_ZZ_dpT->fill(fabs(zee.pT()-zmm.pT()), weight);

      Vector3 crossZee = ep.vector3().cross(em.vector3());
      Vector3 crossZmm = mp.vector3().cross(mm.vector3());
      double costheta = crossZee.dot(crossZmm)/crossZee.mod()/crossZmm.mod();
      _h_ZZ_costheta_planes->fill(costheta, weight);

      _h_Z_pT->fill(zee.pT(),weight);
      _h_Z_pT->fill(zmm.pT(),weight);
      _h_Z_eta->fill(zee.eta(),weight);
      _h_Z_eta->fill(zmm.eta(),weight);

      _h_Zl_pT->fill(ep.pT(), weight);
      _h_Zl_pT->fill(em.pT(), weight);
      _h_Zl_pT->fill(mp.pT(), weight);
      _h_Zl_pT->fill(mm.pT(), weight);
      _h_Zl_eta->fill(ep.eta(), weight);
      _h_Zl_eta->fill(em.eta(), weight);
      _h_Zl_eta->fill(mp.eta(), weight);
      _h_Zl_eta->fill(mm.eta(), weight);

      _h_ZeZm_dphi->fill(mapAngle0ToPi(ep.phi()-mm.phi()), weight);
      _h_ZeZm_deta->fill(ep.eta()-mm.eta(), weight);
      _h_ZeZm_dR->fill(deltaR(ep,mm), weight);
      double m2=FourMomentum(ep+mm).mass2();
      if (m2 < 0) m2 = 0.0;
      _h_ZeZm_m->fill(sqrt(m2), weight);

      const FastJets& jetpro = applyProjection<FastJets>(e, "Jets");
      const Jets& jets = jetpro.jetsByPt(20.0*GeV);
      if (jets.size() > 0) {
        _h_ZZ_jet1_deta->fill(zz.eta()-jets[0].momentum().eta(), weight);
        _h_ZZ_jet1_dR->fill(deltaR(zz, jets[0].momentum()), weight);
        _h_Ze_jet1_dR->fill(deltaR(ep, jets[0].momentum()), weight);
      }

      double HT=ep.pT()+em.pT()+mp.pT()+mm.pT();
      foreach (const Jet& jet, jets) {
        HT+=jet.momentum().pT();
      }
      if (HT>0.0) _h_HT->fill(HT, weight);

      MC_JetAnalysis::analyze(e);
    }


    /// Finalize
    void finalize() {
      double norm=crossSection()/sumOfWeights();
      scale(_h_ZZ_pT, norm);
      scale(_h_ZZ_pT_peak, norm);
      scale(_h_ZZ_eta, norm);
      scale(_h_ZZ_phi, norm);
      scale(_h_ZZ_m, norm);
      scale(_h_ZZ_dphi, norm);
      scale(_h_ZZ_deta, norm);
      scale(_h_ZZ_dR, norm);
      scale(_h_ZZ_dpT, norm);
      scale(_h_ZZ_costheta_planes, norm);
      scale(_h_Z_pT, norm);
      scale(_h_Z_eta, norm);
      scale(_h_Zl_pT, norm);
      scale(_h_Zl_eta, norm);
      scale(_h_ZeZm_dphi, norm);
      scale(_h_ZeZm_deta, norm);
      scale(_h_ZeZm_dR, norm);
      scale(_h_ZeZm_m, norm);
      scale(_h_ZZ_jet1_deta, norm);
      scale(_h_ZZ_jet1_dR, norm);
      scale(_h_Ze_jet1_dR, norm);
      scale(_h_HT, norm);

      MC_JetAnalysis::finalize();
    }

    //@}


  private:

    /// @name Histograms
    //@{
    AIDA::IHistogram1D * _h_ZZ_pT;
    AIDA::IHistogram1D * _h_ZZ_pT_peak;
    AIDA::IHistogram1D * _h_ZZ_eta;
    AIDA::IHistogram1D * _h_ZZ_phi;
    AIDA::IHistogram1D * _h_ZZ_m;
    AIDA::IHistogram1D * _h_ZZ_dphi;
    AIDA::IHistogram1D * _h_ZZ_deta;
    AIDA::IHistogram1D * _h_ZZ_dR;
    AIDA::IHistogram1D * _h_ZZ_dpT;
    AIDA::IHistogram1D * _h_ZZ_costheta_planes;
    AIDA::IHistogram1D * _h_Z_pT;
    AIDA::IHistogram1D * _h_Z_eta;
    AIDA::IHistogram1D * _h_Zl_pT;
    AIDA::IHistogram1D * _h_Zl_eta;
    AIDA::IHistogram1D * _h_ZeZm_dphi;
    AIDA::IHistogram1D * _h_ZeZm_deta;
    AIDA::IHistogram1D * _h_ZeZm_dR;
    AIDA::IHistogram1D * _h_ZeZm_m;
    AIDA::IHistogram1D * _h_ZZ_jet1_deta;
    AIDA::IHistogram1D * _h_ZZ_jet1_dR;
    AIDA::IHistogram1D * _h_Ze_jet1_dR;
    AIDA::IHistogram1D * _h_HT;
    //@}

  };



  // This global object acts as a hook for the plugin system
  AnalysisBuilder<MC_ZZJETS> plugin_MC_ZZJETS;

}