// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/Beam.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/DISKinematics.hh"
#include "Rivet/Projections/DISFinalState.hh"
#include "Rivet/Projections/DISDiffHadron.hh"
#include "Rivet/Projections/FastJets.hh"

namespace Rivet {

  namespace H1_2015_I1343110_PROJECTIONS {

    /// Projection to find the largest gaps and the masses of the two
    /// systems separated by the gap. Based on the HZTools gap-finding
    /// method (hzhadgap.F). Note that gaps are found in the HCM frame.
    ///
    /// @author Christine O. Rasmussen.
    class RapidityGap : public Projection {
    public:

      /// Type of DIS boost to apply
      enum Frame { HCM, LAB, XCM };

      RapidityGap() {
        setName("RapidityGap");
        declare(DISKinematics(), "DISKIN");
        declare(DISFinalState(DISFinalState::BoostFrame::HCM), "DISFS");
      }

      DEFAULT_RIVET_PROJ_CLONE(RapidityGap);

      /// Import to avoid warnings about overload-hiding
      using Projection::operator =;

      double M2X() const { return _M2X; }
      double M2Y() const { return _M2Y; }
      double t() const { return _t; }
      double gap() const { return _gap; }
      double gapUpp() const { return _gapUpp; }
      double gapLow() const { return _gapLow; }
      double EpPzX(Frame f) const {
        if (f == LAB) return _ePpzX_LAB;
        else if (f == XCM) return _ePpzX_XCM;
        else return _ePpzX_HCM;
      }
      double EmPzX(Frame f) const {
        if (f == LAB) return _eMpzX_LAB;
        else if (f == XCM) return _eMpzX_XCM;
        else return _eMpzX_HCM;
      }
      FourMomentum pX(Frame f) const {
        if (f == LAB) return _momX_LAB;
        else if (f == XCM) return _momX_XCM;
        else return _momX_HCM;
      }
      FourMomentum pY(Frame f) const {
        if (f == LAB) return _momY_LAB;
        else if (f == XCM) return _momY_XCM;
        else return _momY_HCM;
      }
      const Particles& systemX(Frame f) const {
        if (f == LAB) return _pX_LAB;
        else if (f == XCM) return _pX_XCM;
        else return _pX_HCM;
      }
      const Particles& systemY(Frame f) const {
        if (f == LAB) return _pY_LAB;
        else if (f == XCM) return _pY_XCM;
        else return _pY_HCM;
      }

    protected:

      virtual CmpState compare(const Projection& p) const {
        const RapidityGap& other = pcast<RapidityGap>(p);
        return mkNamedPCmp(other, "DISKIN") || mkNamedPCmp(other, "DISFS");
      }

      virtual void project(const Event& e){
        const DISKinematics& dk = apply<DISKinematics>(e, "DISKIN");
        const Particles& p      = apply<DISFinalState>(e, "DISFS").particles(cmpMomByEta);
        findgap(p, dk);
      }

      void clearAll(){
        _M2X = _M2Y = _t = _gap = 0.;
        _gapUpp = _gapLow = -8.;
        _ePpzX_HCM = _eMpzX_HCM =_ePpzX_LAB = _eMpzX_LAB = _ePpzX_XCM = _eMpzX_XCM = 0.;
        _momX_HCM.setPE(0., 0., 0., 0.);
        _momY_HCM.setPE(0., 0., 0., 0.);
        _momX_XCM.setPE(0., 0., 0., 0.);
        _momY_XCM.setPE(0., 0., 0., 0.);
        _momX_LAB.setPE(0., 0., 0., 0.);
        _momY_LAB.setPE(0., 0., 0., 0.);
        _pX_HCM.clear();
        _pY_HCM.clear();
        _pX_XCM.clear();
        _pY_XCM.clear();
        _pX_LAB.clear();
        _pY_LAB.clear();
      }

      void findgap(const Particles& particles, const DISKinematics& diskin){

        clearAll();

        // Begin by finding largest gap and gapedges between all final
        // state particles in HCM frame.
        int nP  = particles.size();
        int dir = diskin.orientation();
        for (int i = 0; i < nP-1; ++i){
          double tmpGap = abs(particles[i+1].eta() - particles[i].eta());
          if (tmpGap > _gap) {
            _gap    = tmpGap;
            _gapLow = (dir > 0) ? particles[i].eta() : dir * particles[i+1].eta();
            _gapUpp = (dir > 0) ? particles[i+1].eta() : dir * particles[i].eta();
          }
        }

        // Define the two systems X and Y.
        Particles tmp_pX, tmp_pY;
        for (const Particle& ip : particles) {
          if (dir * ip.eta() > _gapLow) tmp_pX.push_back(ip);
          else tmp_pY.push_back(ip);
        }

        Particles pX, pY;
        pX = (dir < 0) ? tmp_pY : tmp_pX;
        pY = (dir < 0) ? tmp_pX : tmp_pY;

        // Find variables related to HCM frame.
        // Note that HCM has photon along +z, as opposed to
        // H1 where proton is along +z. This results in a sign change
        // as compared to H1 papers!

        // X - side
        FourMomentum momX;
        for (const Particle& jp : pX) {
          momX  += jp.momentum();
          _ePpzX_HCM += jp.E() - jp.pz(); // Sign + => -
          _eMpzX_HCM += jp.E() + jp.pz(); // Sign - => +
        }
        _momX_HCM = momX;
        _pX_HCM   = pX;
        _M2X      = _momX_HCM.mass2();

        // Y - side
        FourMomentum momY;
        for (const Particle& kp : pY) momY += kp.momentum();
        _momY_HCM = momY;
        _pY_HCM   = pY;
        _M2Y      = _momY_HCM.mass2();

        // Find variables related to LAB frame
        const LorentzTransform hcmboost   = diskin.boostHCM();
        const LorentzTransform hcminverse = hcmboost.inverse();
        _momX_LAB = hcminverse.transform(_momX_HCM);
        _momY_LAB = hcminverse.transform(_momY_HCM);

        // Find momenta in XCM frame. Note that it is HCM frame that is
        // boosted, resulting in a sign change later!
        const bool doXCM = (momX.betaVec().mod2() < 1.);
        if (doXCM) {
          const LorentzTransform xcmboost =
            LorentzTransform::mkFrameTransformFromBeta(momX.betaVec());
          _momX_XCM = xcmboost.transform(momX);
          _momY_XCM = xcmboost.transform(momY);
        }

        for (const Particle& jp : pX) {
          // Boost from HCM to LAB.
          FourMomentum lab = hcminverse.transform(jp.momentum());
          _ePpzX_LAB += lab.E() + dir * lab.pz();
          _eMpzX_LAB += lab.E() - dir * lab.pz();
          Particle plab = jp;
          plab.setMomentum(lab);
          _pX_LAB.push_back(plab);
          // Set XCM. Note that since HCM frame is boosted to XCM frame,
          // we have a sign change
          if (doXCM) {
            const LorentzTransform xcmboost =
              LorentzTransform::mkFrameTransformFromBeta(_momX_HCM.betaVec());
            FourMomentum xcm = xcmboost.transform(jp.momentum());
            _ePpzX_XCM += xcm.E() - xcm.pz(); // Sign + => -
            _eMpzX_XCM += xcm.E() + xcm.pz(); // Sign - => +
            Particle pxcm = jp;
            pxcm.setMomentum(xcm);
            _pX_XCM.push_back(pxcm);
          }
        }

        for (const Particle& jp : pY) {
          // Boost from HCM to LAB
          FourMomentum lab = hcminverse.transform(jp.momentum());
          Particle plab = jp;
          plab.setMomentum(lab);
          _pY_LAB.push_back(plab);
          // Boost from HCM to XCM
          if (doXCM) {
            const LorentzTransform xcmboost =
              LorentzTransform::mkFrameTransformFromBeta(_momX_HCM.betaVec());
            FourMomentum xcm = xcmboost.transform(jp.momentum());
            Particle pxcm = jp;
            pxcm.setMomentum(xcm);
            _pY_XCM.push_back(pxcm);
          }
        }

        // Find t: Currently can only handle gap on proton side.
        // @TODO: Expand to also handle gap on photon side
        // Boost p from LAB to HCM frame to find t.
        const FourMomentum proton = hcmboost.transform(diskin.beamHadron().momentum());
        FourMomentum pPom         = proton - _momY_HCM;
        _t                        = pPom * pPom;

      }

    private:

      double _M2X, _M2Y, _t;
      double _gap, _gapUpp, _gapLow;
      double _ePpzX_LAB, _eMpzX_LAB, _ePpzX_HCM, _eMpzX_HCM, _ePpzX_XCM, _eMpzX_XCM;
      FourMomentum _momX_HCM, _momY_HCM,_momX_LAB, _momY_LAB, _momX_XCM, _momY_XCM;
      Particles _pX_HCM, _pY_HCM, _pX_LAB, _pY_LAB, _pX_XCM, _pY_XCM;

    };

    /// Projection to boost system X (photon+Pomeron) particles into its rest frame.
    ///
    /// @author Ilkka Helenius
    class BoostedXSystem : public FinalState {
    public:

      BoostedXSystem(const FinalState& fs) {
        setName("BoostedXSystem");
        declare(fs,"FS");
        declare(RapidityGap(), "RAPGAP");
      }

      // Return the boost to XCM frame.
      const LorentzTransform& boost() const { return _boost; }

      DEFAULT_RIVET_PROJ_CLONE(BoostedXSystem);

      /// Import to avoid warnings about overload-hiding
      using Projection::operator =;

    protected:

      // Apply the projection on the supplied event.
      void project(const Event& e){

        const RapidityGap& rg = apply<RapidityGap>(e, "RAPGAP");

        // Total momentum of the system X.
        const FourMomentum pX = rg.pX(RapidityGap::HCM);

        // Reset the boost. Is there a separate method for this?
        _boost = combine(_boost, _boost.inverse());

        // Define boost only when numerically safe, otherwise negligible.
        if (pX.betaVec().mod2() < 1.)
          _boost = LorentzTransform::mkFrameTransformFromBeta(pX.betaVec());

        // Boost the particles from system X.
        _theParticles.clear();
        _theParticles.reserve(rg.systemX(RapidityGap::HCM).size());
        for (const Particle& p : rg.systemX(RapidityGap::HCM)) {
          Particle temp = p;
          temp.setMomentum(_boost.transform(temp.momentum()));
          _theParticles.push_back(temp);
        }

      }

      // Compare projections.
      CmpState compare(const Projection& p) const {
        const BoostedXSystem& other = pcast<BoostedXSystem>(p);
        return mkNamedPCmp(other, "RAPGAP") || mkNamedPCmp(other, "FS");
      }

    private:

      LorentzTransform _boost;

    };

  }

  /// @brief H1 diffractive dijets
  ///
  /// Diffractive dijets H1 with 920 GeV p and 27.5 GeV e
  /// Tagged protons & jets found in gamma*p rest frame.
  ///
  /// @author Christine O. Rasmussen
  class H1_2015_I1343110 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(H1_2015_I1343110);

    typedef H1_2015_I1343110_PROJECTIONS::RapidityGap RapidityGap;
    typedef H1_2015_I1343110_PROJECTIONS::BoostedXSystem BoostedXSystem;

    /// @name Analysis methods
    //@{

    // Book projections and histograms
    void init() {

      declare(DISKinematics(), "Kinematics");
      const DISFinalState& disfs = declare(DISFinalState(DISFinalState::BoostFrame::HCM), "DISFS");
      const BoostedXSystem& disfsXcm = declare( BoostedXSystem(disfs), "BoostedXFS");
      declare(FastJets(disfsXcm, fastjet::JetAlgorithm::kt_algorithm, fastjet::RecombinationScheme::pt_scheme, 1.0,
                       JetAlg::Muons::ALL, JetAlg::Invisibles::NONE, nullptr), "DISFSJets");
      declare(DISDiffHadron(), "Hadron");
      declare(RapidityGap(), "RapidityGap");

      // Book histograms from REF data
      book(_h_PHO_sig_sqrts, 1, 1, 1);
      book(_h_DIS_sig_sqrts, 2, 1, 1);
      book(_h_PHODIS_sqrts, 3, 1, 1);

      book(_h_DIS_dsigdz, 4, 1, 1);
      book(_h_DIS_dsigdxPom, 5, 1, 1);
      book(_h_DIS_dsigdy, 6, 1, 1);
      book(_h_DIS_dsigdQ2, 7, 1, 1);
      book(_h_DIS_dsigdEtj1, 8, 1, 1);
      book(_h_DIS_dsigdMX, 9, 1, 1);
      book(_h_DIS_dsigdDeltaEta, 10, 1, 1);
      book(_h_DIS_dsigdAvgEta, 11, 1, 1);

      book(_h_PHO_dsigdz, 12, 1, 1);
      book(_h_PHO_dsigdxPom, 13, 1, 1);
      book(_h_PHO_dsigdy, 14, 1, 1);
      book(_h_PHO_dsigdxGam, 15, 1, 1);
      book(_h_PHO_dsigdEtj1, 16, 1, 1);
      book(_h_PHO_dsigdMX, 17, 1, 1);
      book(_h_PHO_dsigdDeltaEta, 18, 1, 1);
      book(_h_PHO_dsigdAvgEta, 19, 1, 1);

      book(_h_PHODIS_deltaEta, 20, 1, 1);
      book(_h_PHODIS_y, 21, 1, 1);
      book(_h_PHODIS_z, 22, 1, 1);
      book(_h_PHODIS_Etj1, 23, 1, 1);

      isPHO  = false;
      nVeto1 = 0;
      nVeto2 = 0;
      nVeto3 = 0;
      nVeto4 = 0;
      nVeto5 = 0;
      nVeto6 = 0;
      nPHO   = 0;
      nDIS   = 0;
    }

    // Do the analysis
    void analyze(const Event& event) {

      // Event weight
      isPHO  = false;

      // Projections - special handling of events where no proton found:
      const RapidityGap&    rg = apply<RapidityGap>(event, "RapidityGap");
      const DISKinematics& kin = apply<DISKinematics>(event, "Kinematics");
      const BoostedXSystem& disfsXcm = apply<BoostedXSystem>( event, "BoostedXFS");
      Particle hadronOut;
      Particle hadronIn;
      try {
        const DISDiffHadron& diffhadr = apply<DISDiffHadron>(event, "Hadron");
        hadronOut = diffhadr.out();
        hadronIn  = diffhadr.in();
      } catch (const Error& e){
        vetoEvent;
      }

      // Determine kinematics: H1 has +z = proton direction
      int dir   = kin.orientation();
      double y  = kin.y();
      double Q2 = kin.Q2();

      // Separate into DIS and PHO regimes else veto
      if (Q2 < 2.*GeV2 && inRange(y, 0.2, 0.70)) {
        isPHO = true;
        ++nPHO;
      } else if (inRange(Q2, 4.0*GeV2, 80.*GeV2) && inRange(y, 0.2, 0.7)) {
        isPHO = false;
        ++nDIS;
      } else vetoEvent;
      ++nVeto1;

      // Find diffractive variables as defined in paper.
      // Note tagged protons in VFPS => smaller allowed xPom range
      // xPom = 1 - E'/E, M2X from hadrons, t = (P-P')^2
      const double M2X  = rg.M2X();
      const double abst = abs(rg.t());
      const double xPom = 1. - hadronOut.energy() / hadronIn.energy();

      //cout << "\nhadout=" << hadronOut.energy() << ", hadin=" << hadronIn.energy() << endl;
      //cout << "xPomH1=" << (Q2+M2X) / (y * sqr(sqrtS())) << endl;
      //cout << "|t|=" << abst << ", xPom=" << xPom << endl;
      // Veto if outside allowed region
      if (abst > 0.6 * GeV2)              vetoEvent;
      ++nVeto2;
      if (!inRange(xPom, 0.010, 0.024)) vetoEvent;
      ++nVeto3;

      // Jet selection. Note jets are found in XCM frame, but
      // eta cut is applied in lab frame!
      Cut jetcuts = Cuts::Et > 4.* GeV;
      Jets jets   = apply<FastJets>(event, "DISFSJets").jets(jetcuts, cmpMomByEt);
      // Veto if not dijets and if Et_j1 < 5.5
      if (jets.size() < 2)          vetoEvent;
      if (jets[0].Et() < 5.5 * GeV) vetoEvent;
      ++nVeto4;
      // Find Et_jet1 in XCM frame
      double EtJet1 = jets[0].Et() * GeV;

      //cout << "gamma*p frame:" << endl;
      //cout << "Et1=" << jets[0].Et() << ", E1=" << jets[0].E() << ", pz1=" << jets[0].pz()  << ", m1=" << jets[0].mass() << endl;
      //cout << "Et2=" << jets[1].Et() << ", E2=" << jets[1].E() << ", pz2=" << jets[1].pz()  << ", m2=" << jets[1].mass() << endl;

      // Transform from XCM to HCM
      const LorentzTransform xcmboost = disfsXcm.boost();
      for (int i = 0; i < 2; ++i) jets[i].transformBy(xcmboost.inverse());

      // Find mass of jets and EpPz, EmPz of jets in HCM frame.
      FourMomentum momJets = jets[0].momentum() + jets[1].momentum();
      double M2jets        = momJets.mass2();
      double EpPzJets      = 0.;
      double EmPzJets      = 0.;
      // Note sign change wrt. H1 because photon is in +z direction
      for (int i = 0; i < 2; ++i){
        EpPzJets += jets[i].E() - jets[i].pz(); // Sign: + => -
        EmPzJets += jets[i].E() + jets[i].pz(); // Sign: - => +
      }

      // Transform the jets from HCM to LAB frame where eta cut is
      // applied for photoproduction.
      const LorentzTransform hcmboost = kin.boostHCM();
      for (int i = 0; i < 2; ++i) jets[i].transformBy(hcmboost.inverse());
      double etaLabJet1 = dir * jets[0].eta();
      double etaLabJet2 = dir * jets[1].eta();
      if (!inRange(etaLabJet1, -1., 2.5)) vetoEvent;
      if (!inRange(etaLabJet2, -1., 2.5)) vetoEvent;
      ++nVeto5;

      // Pseudorapidity distributions are examined in lab frame:
      double deltaEtaJets = abs(dir * jets[0].eta() - dir * jets[1].eta());
      double avgEtaJets   = 0.5 * (dir * jets[0].eta() + dir * jets[1].eta());

      // Evaluate observables
      double zPomJets, xGamJets = 0.;
      if (isPHO){
        zPomJets = EpPzJets / rg.EpPzX(RapidityGap::HCM);
        xGamJets = EmPzJets / rg.EmPzX(RapidityGap::HCM);
        //cout << "xGamJets=" << xGamJets << endl;
      } else {
        zPomJets = (Q2 + M2jets) / (Q2 + M2X);
      }

      //cout << "lab frame:" << endl;
      //cout << "Et1=" << jets[0].Et() << ", E1=" << jets[0].E() << ", pz1=" << jets[0].pz() << ", m1=" << jets[0].mass() <<  endl;
      //cout << "Et2=" << jets[1].Et() << ", E2=" << jets[1].E() << ", pz2=" << jets[1].pz() << ", m2=" << jets[1].mass() <<  endl;
      //cout << "EpPzJets=" << EpPzJets << ", EmPzJets=" << EmPzJets << endl;
      //cout << "Et*exp(eta)=" << jets[0].Et()*exp(etaLabJet1) + jets[1].Et()*exp(etaLabJet2) << endl;
      //cout << "Et*exp(-eta)=" << jets[0].Et()*exp(-etaLabJet1) + jets[1].Et()*exp(-etaLabJet2) << endl;
      //cout << "EpPz=" << rg.EpPzX(RapidityGap::HCM) << ", EmPz=" << rg.EmPzX(RapidityGap::HCM) << endl;
      //cout << "2 xPom Ep=" << 2. * xPom * kin.beamHadron().E() << ", 2 y Ee=" << 2. * y * kin.beamLepton().E() << endl;
      //cout << "xGam=" << xGamJets << ", zPom=" << zPomJets << endl;
      //cout << "M12=" << M2jets << ", deltaEta=" << deltaEtaJets << ", avgEta=" << avgEtaJets << endl;

      // Veto events with zPom > 0.8
      if (zPomJets > 0.8) vetoEvent;
      ++nVeto6;

      // Now fill histograms
      if (isPHO){
        _h_PHO_sig_sqrts     ->fill(sqrtS()/GeV);
        _h_PHO_dsigdz        ->fill(zPomJets);
        _h_PHO_dsigdxPom     ->fill(xPom);
        _h_PHO_dsigdy        ->fill(y);
        _h_PHO_dsigdxGam     ->fill(xGamJets);
        _h_PHO_dsigdEtj1     ->fill(EtJet1);
        _h_PHO_dsigdMX       ->fill(sqrt(M2X)/GeV);
        _h_PHO_dsigdDeltaEta ->fill(deltaEtaJets);
        _h_PHO_dsigdAvgEta   ->fill(avgEtaJets);
      } else {
        _h_DIS_sig_sqrts     ->fill(sqrtS()/GeV);
        _h_DIS_dsigdz        ->fill(zPomJets);
        _h_DIS_dsigdxPom     ->fill(xPom);
        _h_DIS_dsigdy        ->fill(y);
        _h_DIS_dsigdQ2       ->fill(Q2);
        _h_DIS_dsigdEtj1     ->fill(EtJet1);
        _h_DIS_dsigdMX       ->fill(sqrt(M2X)/GeV);
        _h_DIS_dsigdDeltaEta ->fill(deltaEtaJets);
        _h_DIS_dsigdAvgEta   ->fill(avgEtaJets);
      }

    }

    // Finalize
    void finalize() {
      // Normalise to cross section
      // Remember to manually scale the cross section afterwards with
      // the number of rejected events.
      const double norm = crossSection()/picobarn/sumOfWeights();

      scale(_h_PHO_sig_sqrts,     norm);
      scale(_h_PHO_dsigdz,        norm);
      scale(_h_PHO_dsigdxPom,     norm);
      scale(_h_PHO_dsigdy,        norm);
      scale(_h_PHO_dsigdxGam,     norm);
      scale(_h_PHO_dsigdEtj1,     norm);
      scale(_h_PHO_dsigdMX,       norm);
      scale(_h_PHO_dsigdDeltaEta, norm);
      scale(_h_PHO_dsigdAvgEta,   norm);

      scale(_h_DIS_sig_sqrts,     norm);
      scale(_h_DIS_dsigdz,        norm);
      scale(_h_DIS_dsigdxPom,     norm);
      scale(_h_DIS_dsigdy,        norm);
      scale(_h_DIS_dsigdQ2,       norm);
      scale(_h_DIS_dsigdEtj1,     norm);
      scale(_h_DIS_dsigdMX,       norm);
      scale(_h_DIS_dsigdDeltaEta, norm);
      scale(_h_DIS_dsigdAvgEta,   norm);

      if (_h_DIS_sig_sqrts->numEntries() != 0)
        divide(_h_PHO_sig_sqrts, _h_DIS_sig_sqrts, _h_PHODIS_sqrts);
      if (_h_DIS_dsigdDeltaEta->numEntries() != 0)
        divide(_h_PHO_dsigdDeltaEta, _h_DIS_dsigdDeltaEta, _h_PHODIS_deltaEta);
      if (_h_DIS_dsigdy->numEntries() != 0)
        divide(_h_PHO_dsigdy, _h_DIS_dsigdy, _h_PHODIS_y);
      if (_h_DIS_dsigdz->numEntries() != 0)
        divide(_h_PHO_dsigdz, _h_DIS_dsigdz, _h_PHODIS_z);
      if (_h_DIS_dsigdEtj1->numEntries() != 0)
        divide(_h_PHO_dsigdEtj1, _h_DIS_dsigdEtj1, _h_PHODIS_Etj1);

      const double dPHO = nPHO;
      MSG_INFO("H1_2015_I1343110");
      MSG_INFO("Cross section = " << crossSection()/picobarn << " pb");
      MSG_INFO("Number of events = " << numEvents() << ", sumW = " << sumOfWeights());
      MSG_INFO("Number of PHO = " << nPHO << ", number of DIS = " << nDIS);
      MSG_INFO("Events passing electron veto   = " << nVeto1 << " (" << nVeto1/dPHO * 100. << "%)" );
      MSG_INFO("Events passing t veto          = " << nVeto2 << " (" << nVeto2/dPHO * 100. << "%)" );
      MSG_INFO("Events passing xPom            = " << nVeto3 << " (" << nVeto3/dPHO * 100. << "%)" );
      MSG_INFO("Events passing jet Et   veto   = " << nVeto4 << " (" << nVeto4/dPHO * 100. << "%)" );
      MSG_INFO("Events passing jet eta veto    = " << nVeto5 << " (" << nVeto5/dPHO * 100. << "%)" );
      MSG_INFO("Events passing zPom veto       = " << nVeto6 << " (" << nVeto6/dPHO * 100. << "%)" );

    }

    //@}


  private:

    /// @name Histograms
    //@{
    // Book histograms from REF data
    Histo1DPtr _h_PHO_sig_sqrts;
    Histo1DPtr _h_DIS_sig_sqrts;
    Scatter2DPtr _h_PHODIS_sqrts;

    Histo1DPtr _h_DIS_dsigdz;
    Histo1DPtr _h_DIS_dsigdxPom;
    Histo1DPtr _h_DIS_dsigdy;
    Histo1DPtr _h_DIS_dsigdQ2;
    Histo1DPtr _h_DIS_dsigdEtj1;
    Histo1DPtr _h_DIS_dsigdMX;
    Histo1DPtr _h_DIS_dsigdDeltaEta;
    Histo1DPtr _h_DIS_dsigdAvgEta;

    Histo1DPtr _h_PHO_dsigdz;
    Histo1DPtr _h_PHO_dsigdxPom;
    Histo1DPtr _h_PHO_dsigdy;
    Histo1DPtr _h_PHO_dsigdxGam;
    Histo1DPtr _h_PHO_dsigdEtj1;
    Histo1DPtr _h_PHO_dsigdMX;
    Histo1DPtr _h_PHO_dsigdDeltaEta;
    Histo1DPtr _h_PHO_dsigdAvgEta;

    Scatter2DPtr _h_PHODIS_deltaEta;
    Scatter2DPtr _h_PHODIS_y;
    Scatter2DPtr _h_PHODIS_z;
    Scatter2DPtr _h_PHODIS_Etj1;
    //@}

    bool isPHO;
    int  nVeto1, nVeto2, nVeto3, nVeto4, nVeto5, nVeto6;
    int  nPHO, nDIS;
  };

  RIVET_DECLARE_PLUGIN(H1_2015_I1343110);

}