GENIEGen_module.cc

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//
//
// GENIE neutrino event generator
//
// brebel@fnal.gov
//

#include <cstdlib>
#include <iomanip>
#include <iostream>
#include <memory>
#include <string>

// ROOT includes
#include "TDatabasePDG.h"
#include "TH1.h"
#include "TH2.h"
#include "TStopwatch.h"

// Framework includes
#include "art/Framework/Core/EDProducer.h"
#include "art/Framework/Core/ModuleMacros.h"
#include "art/Framework/Principal/Event.h"
#include "art/Framework/Principal/SubRun.h"
#include "art/Framework/Services/Registry/ServiceHandle.h"
#include "art/Persistency/Common/PtrMaker.h"
#include "art_root_io/TFileService.h"
#include "canvas/Persistency/Common/Assns.h"
#include "fhiclcpp/ParameterSet.h"
#include "messagefacility/MessageLogger/MessageLogger.h"

// art extensions
#include "nurandom/RandomUtils/NuRandomService.h"

// LArSoft includes
#include "larcore/Geometry/Geometry.h"
#include "larcoreobj/SummaryData/POTSummary.h"
#include "larcoreobj/SummaryData/RunData.h"
#include "lardata/Utilities/AssociationUtil.h"
#include "lardataalg/MCDumpers/MCDumpers.h" // sim::dump namespace
#include "lardataobj/Simulation/BeamGateInfo.h"
#include "nugen/EventGeneratorBase/GENIE/GENIEHelper.h"
#include "nusimdata/SimulationBase/GTruth.h"
#include "nusimdata/SimulationBase/MCFlux.h"
#include "nusimdata/SimulationBase/MCTruth.h"

// dk2nu extensions
#include "dk2nu/genie/GDk2NuFlux.h"
#include "dk2nu/tree/NuChoice.h"
#include "dk2nu/tree/dk2nu.h"

#include "GENIE/Framework/EventGen/EventRecord.h"
#include "nugen/EventGeneratorBase/GENIE/EVGBAssociationUtil.h"
#include "nugen/EventGeneratorBase/evgenbase.h"

namespace evgen {
  class GENIEGen : public art::EDProducer {
  public:
    explicit GENIEGen(fhicl::ParameterSet const& pset);
    virtual ~GENIEGen();

    void produce(art::Event& evt);
    void beginJob();
    void beginRun(art::Run& run);
    void beginSubRun(art::SubRun& sr);
    void endSubRun(art::SubRun& sr);

  private:
    std::string ParticleStatus(int StatusCode);
    std::string ReactionChannel(int ccnc, int mode);

    void FillHistograms(simb::MCTruth mc);

    evgb::GENIEHelper* fGENIEHelp; 
    bool
      fDefinedVtxHistRange; 
    std::vector<double> fVtxPosHistRange;

    int fPassEmptySpills;  
    TStopwatch fStopwatch; 

    double fGlobalTimeOffset;    
    double fRandomTimeOffset;    
    ::sim::BeamType_t fBeamType; 

    double fPrevTotPOT;     
    double fPrevTotGoodPOT; 

    TH1F* fGenerated[6]; 

    TH1F* fVertexX; 
    TH1F* fVertexY; 
    TH1F* fVertexZ; 

    TH2F* fVertexXY; 
    TH2F* fVertexXZ; 
    TH2F* fVertexYZ; 

    TH1F* fDCosX; 
    TH1F* fDCosY; 
    TH1F* fDCosZ; 

    TH1F* fMuMomentum; 
    TH1F* fMuDCosX;    
    TH1F* fMuDCosY;    
    TH1F* fMuDCosZ;    

    TH1F* fEMomentum; 
    TH1F* fEDCosX;    
    TH1F* fEDCosY;    
    TH1F* fEDCosZ;    

    TH1F* fCCMode; 
    TH1F* fNCMode; 

    TH1F* fDeltaE; 
    TH1F* fECons;  
  };
}

namespace evgen {

  //____________________________________________________________________________
  GENIEGen::GENIEGen(fhicl::ParameterSet const& pset)
    : EDProducer{pset}
    , fGENIEHelp(0)
    , fDefinedVtxHistRange(pset.get<bool>("DefinedVtxHistRange"))
    , fVtxPosHistRange(pset.get<std::vector<double>>("VtxPosHistRange"))
    , fPassEmptySpills(pset.get<bool>("PassEmptySpills"))
    , fGlobalTimeOffset(pset.get<double>("GlobalTimeOffset", 0))
    , fRandomTimeOffset(pset.get<double>("RandomTimeOffset", 1600.)) // BNB default value
    , fBeamType(::sim::kBNB)
  {
    fStopwatch.Start();

    produces<std::vector<simb::MCTruth>>();
    produces<std::vector<simb::MCFlux>>();
    produces<std::vector<simb::GTruth>>();
    produces<sumdata::RunData, art::InRun>();
    produces<sumdata::POTSummary, art::InSubRun>();
    produces<art::Assns<simb::MCTruth, simb::MCFlux>>();
    produces<art::Assns<simb::MCTruth, simb::GTruth>>();
    produces<std::vector<sim::BeamGateInfo>>();

    // dk2nu additions
    if (pset.get<std::string>("FluxType").find("dk2nu") != std::string::npos) {
      produces<std::vector<bsim::Dk2Nu>>();
      produces<std::vector<bsim::NuChoice>>();
      produces<art::Assns<simb::MCTruth, bsim::Dk2Nu>>();
      produces<art::Assns<simb::MCTruth, bsim::NuChoice>>();
    }

    std::string beam_type_name = pset.get<std::string>("BeamName");

    if (beam_type_name == "numi")

      fBeamType = ::sim::kNuMI;

    else if (beam_type_name == "booster")

      fBeamType = ::sim::kBNB;

    else

      fBeamType = ::sim::kUnknown;

    art::ServiceHandle<geo::Geometry const> geo;

    signed int temp_seed; // the seed read by GENIEHelper is a signed integer...
    fhicl::ParameterSet GENIEconfig(pset);
    if (!GENIEconfig.get_if_present("RandomSeed",
                                    temp_seed)) { // TODO use has_key() when it becomes available
      // no RandomSeed specified; check for the LArSoft-style "Seed" instead:
      // obtain the random seed from a service,
      // unless overridden in configuration with key "Seed"
      unsigned int seed;
      if (!GENIEconfig.get_if_present("Seed", seed))
        seed = art::ServiceHandle<rndm::NuRandomService>()->getSeed();

      // The seed is not passed to RandomNumberGenerator,
      // since GENIE uses a TRandom generator that is owned by the GENIEHelper.
      // Instead, we explicitly configure the random seed for GENIEHelper:
      GENIEconfig.put("RandomSeed", seed);
    } // if no RandomSeed present

    double detectorMass = 0;
    // detectorMass is _only_ needed by GENIEHelper in the case of
    // histogram flux and non-fixed # of event/spill (ie. POTPerSpill non-zero)
    if (pset.get<std::string>("FluxType").find("histogram") == 0 &&
        pset.get<double>("EventsPerSpill") == 0.0 && pset.get<double>("POTPerSpill") > 0.0) {
      TStopwatch timer;
      timer.Start();
      detectorMass = geo->TotalMass(pset.get<std::string>("TopVolume").c_str());
      timer.Stop();
      mf::LogInfo("GENIEProductionTime")
        << "real time to calculate TotalMass: " << timer.RealTime() << " sec";
    }

    fGENIEHelp =
      new evgb::GENIEHelper(GENIEconfig, geo->ROOTGeoManager(), geo->ROOTFile(), detectorMass);
  }

  //____________________________________________________________________________
  GENIEGen::~GENIEGen()
  {
    if (fGENIEHelp) delete fGENIEHelp;
    fStopwatch.Stop();
    mf::LogInfo("GENIEProductionTime") << "real time to produce file: " << fStopwatch.RealTime();
  }

  //____________________________________________________________________________
  void GENIEGen::beginJob()
  {
    fGENIEHelp->Initialize();

    fPrevTotPOT = 0.;
    fPrevTotGoodPOT = 0.;

    // Get access to the TFile service.
    art::ServiceHandle<art::TFileService const> tfs;

    fGenerated[0] = tfs->make<TH1F>("fGenerated_necc", "", 100, 0.0, 20.0);
    fGenerated[1] = tfs->make<TH1F>("fGenerated_nebcc", "", 100, 0.0, 20.0);
    fGenerated[2] = tfs->make<TH1F>("fGenerated_nmcc", "", 100, 0.0, 20.0);
    fGenerated[3] = tfs->make<TH1F>("fGenerated_nmbcc", "", 100, 0.0, 20.0);
    fGenerated[4] = tfs->make<TH1F>("fGenerated_nnc", "", 100, 0.0, 20.0);
    fGenerated[5] = tfs->make<TH1F>("fGenerated_nbnc", "", 100, 0.0, 20.0);

    fDCosX = tfs->make<TH1F>("fDCosX", ";dx/ds", 200, -1., 1.);
    fDCosY = tfs->make<TH1F>("fDCosY", ";dy/ds", 200, -1., 1.);
    fDCosZ = tfs->make<TH1F>("fDCosZ", ";dz/ds", 200, -1., 1.);

    fMuMomentum = tfs->make<TH1F>("fMuMomentum", ";p_{#mu} (GeV/c)", 500, 0., 50.);
    fMuDCosX = tfs->make<TH1F>("fMuDCosX", ";dx/ds;", 200, -1., 1.);
    fMuDCosY = tfs->make<TH1F>("fMuDCosY", ";dy/ds;", 200, -1., 1.);
    fMuDCosZ = tfs->make<TH1F>("fMuDCosZ", ";dz/ds;", 200, -1., 1.);

    fEMomentum = tfs->make<TH1F>("fEMomentum", ";p_{e} (GeV/c)", 500, 0., 50.);
    fEDCosX = tfs->make<TH1F>("fEDCosX", ";dx/ds;", 200, -1., 1.);
    fEDCosY = tfs->make<TH1F>("fEDCosY", ";dy/ds;", 200, -1., 1.);
    fEDCosZ = tfs->make<TH1F>("fEDCosZ", ";dz/ds;", 200, -1., 1.);

    fCCMode = tfs->make<TH1F>("fCCMode", ";CC Interaction Mode;", 4, 0., 4.);
    fCCMode->GetXaxis()->SetBinLabel(1, "QE");
    fCCMode->GetXaxis()->SetBinLabel(2, "Res");
    fCCMode->GetXaxis()->SetBinLabel(3, "DIS");
    fCCMode->GetXaxis()->SetBinLabel(4, "Coh");
    fCCMode->GetXaxis()->CenterLabels();

    fNCMode = tfs->make<TH1F>("fNCMode", ";NC Interaction Mode;", 4, 0., 4.);
    fNCMode->GetXaxis()->SetBinLabel(1, "QE");
    fNCMode->GetXaxis()->SetBinLabel(2, "Res");
    fNCMode->GetXaxis()->SetBinLabel(3, "DIS");
    fNCMode->GetXaxis()->SetBinLabel(4, "Coh");
    fNCMode->GetXaxis()->CenterLabels();

    fDeltaE = tfs->make<TH1F>("fDeltaE", ";#Delta E_{#nu} (GeV);", 200, -1., 1.);
    fECons = tfs->make<TH1F>("fECons", ";#Delta E(#nu,lepton);", 500, -5., 5.);

    if (fDefinedVtxHistRange == false) {
      art::ServiceHandle<geo::Geometry const> geo;
      double x = 2.1 * geo->DetHalfWidth();
      double y = 2.1 * geo->DetHalfHeight();
      double z = 2. * geo->DetLength();
      int xdiv = TMath::Nint(2 * x / 5.);
      int ydiv = TMath::Nint(2 * y / 5.);
      int zdiv = TMath::Nint(2 * z / 5.);

      fVertexX = tfs->make<TH1F>("fVertexX", ";x (cm)", xdiv, -0.1 * x, x);
      fVertexY = tfs->make<TH1F>("fVertexY", ";y (cm)", ydiv, -y, y);
      fVertexZ = tfs->make<TH1F>("fVertexZ", ";z (cm)", zdiv, -0.1 * z, z);

      fVertexXY = tfs->make<TH2F>("fVertexXY", ";x (cm);y (cm)", xdiv, -0.1 * x, x, ydiv, -y, y);
      fVertexXZ =
        tfs->make<TH2F>("fVertexXZ", ";z (cm);x (cm)", zdiv, -0.2 * z, z, xdiv, -0.1 * x, x);
      fVertexYZ = tfs->make<TH2F>("fVertexYZ", ";z (cm);y (cm)", zdiv, -0.2 * z, z, ydiv, -y, y);
    }
    else {
      int xdiv = TMath::Nint((fVtxPosHistRange[1] - fVtxPosHistRange[0]) / 5.);
      int ydiv = TMath::Nint((fVtxPosHistRange[3] - fVtxPosHistRange[2]) / 5.);
      int zdiv = TMath::Nint((fVtxPosHistRange[5] - fVtxPosHistRange[4]) / 5.);

      fVertexX =
        tfs->make<TH1F>("fVertexX", ";x (cm)", xdiv, fVtxPosHistRange[0], fVtxPosHistRange[1]);
      fVertexY =
        tfs->make<TH1F>("fVertexY", ";y (cm)", ydiv, fVtxPosHistRange[2], fVtxPosHistRange[3]);
      fVertexZ =
        tfs->make<TH1F>("fVertexZ", ";z (cm)", zdiv, fVtxPosHistRange[4], fVtxPosHistRange[5]);

      fVertexXY = tfs->make<TH2F>("fVertexXY",
                                  ";x (cm);y (cm)",
                                  xdiv,
                                  fVtxPosHistRange[0],
                                  fVtxPosHistRange[1],
                                  ydiv,
                                  fVtxPosHistRange[2],
                                  fVtxPosHistRange[3]);
      fVertexXZ = tfs->make<TH2F>("fVertexXZ",
                                  ";z (cm);x (cm)",
                                  zdiv,
                                  fVtxPosHistRange[4],
                                  fVtxPosHistRange[5],
                                  xdiv,
                                  fVtxPosHistRange[0],
                                  fVtxPosHistRange[1]);
      fVertexYZ = tfs->make<TH2F>("fVertexYZ",
                                  ";z (cm);y (cm)",
                                  zdiv,
                                  fVtxPosHistRange[4],
                                  fVtxPosHistRange[5],
                                  ydiv,
                                  fVtxPosHistRange[2],
                                  fVtxPosHistRange[3]);
    }
  }

  //____________________________________________________________________________
  void GENIEGen::beginRun(art::Run& run)
  {
    art::ServiceHandle<geo::Geometry const> geo;
    run.put(std::make_unique<sumdata::RunData>(geo->DetectorName()), art::fullRun());
  }

  //____________________________________________________________________________
  void GENIEGen::beginSubRun(art::SubRun& sr)
  {

    fPrevTotPOT = fGENIEHelp->TotalExposure();
    fPrevTotGoodPOT = fGENIEHelp->TotalExposure();

    return;
  }

  //____________________________________________________________________________
  void GENIEGen::endSubRun(art::SubRun& sr)
  {

    auto p = std::make_unique<sumdata::POTSummary>();

    p->totpot = fGENIEHelp->TotalExposure() - fPrevTotPOT;
    p->totgoodpot = fGENIEHelp->TotalExposure() - fPrevTotGoodPOT;

    sr.put(std::move(p), art::subRunFragment());

    return;
  }

  //____________________________________________________________________________
  void GENIEGen::produce(art::Event& evt)
  {
    std::unique_ptr<std::vector<simb::MCTruth>> truthcol(new std::vector<simb::MCTruth>);
    std::unique_ptr<std::vector<simb::MCFlux>> fluxcol(new std::vector<simb::MCFlux>);
    std::unique_ptr<std::vector<simb::GTruth>> gtruthcol(new std::vector<simb::GTruth>);
    std::unique_ptr<art::Assns<simb::MCTruth, simb::MCFlux>> tfassn(
      new art::Assns<simb::MCTruth, simb::MCFlux>);
    std::unique_ptr<art::Assns<simb::MCTruth, simb::GTruth>> tgtassn(
      new art::Assns<simb::MCTruth, simb::GTruth>);
    std::unique_ptr<std::vector<sim::BeamGateInfo>> gateCollection(
      new std::vector<sim::BeamGateInfo>);

    std::unique_ptr<std::vector<bsim::Dk2Nu>> dk2nucol(new std::vector<bsim::Dk2Nu>);
    std::unique_ptr<std::vector<bsim::NuChoice>> nuchoicecol(new std::vector<bsim::NuChoice>);
    std::unique_ptr<art::Assns<simb::MCTruth, bsim::Dk2Nu>> dk2nuassn(
      new art::Assns<simb::MCTruth, bsim::Dk2Nu>);
    std::unique_ptr<art::Assns<simb::MCTruth, bsim::NuChoice>> nuchoiceassn(
      new art::Assns<simb::MCTruth, bsim::NuChoice>);

    genie::flux::GDk2NuFlux* dk2nuDriver =
      dynamic_cast<genie::flux::GDk2NuFlux*>(fGENIEHelp->GetFluxDriver(true));
    while (truthcol->size() < 1) {
      while (!fGENIEHelp->Stop()) {

        simb::MCTruth truth;
        simb::MCFlux flux;
        simb::GTruth gTruth;

        // GENIEHelper returns a false in the sample method if
        // either no neutrino was generated, or the interaction
        // occurred beyond the detector's z extent - ie something we
        // would never see anyway.
        if (fGENIEHelp->Sample(truth, flux, gTruth)) {

          truthcol->push_back(truth);
          fluxcol->push_back(flux);
          gtruthcol->push_back(gTruth);
          auto const truthPtr = art::PtrMaker<simb::MCTruth>{evt}(truthcol->size() - 1);
          tfassn->addSingle(truthPtr, art::PtrMaker<simb::MCFlux>{evt}(fluxcol->size() - 1));
          tgtassn->addSingle(truthPtr, art::PtrMaker<simb::GTruth>{evt}(gtruthcol->size() - 1));

          FillHistograms(truth);

          if (dk2nuDriver) {
            const bsim::Dk2Nu& dk2nuObj = dk2nuDriver->GetDk2Nu();
            dk2nucol->push_back(dk2nuObj);
            const bsim::NuChoice& nuchoiceObj = dk2nuDriver->GetNuChoice();
            nuchoicecol->push_back(nuchoiceObj);
            util::CreateAssn(
              evt, *truthcol, *dk2nucol, *dk2nuassn, dk2nucol->size() - 1, dk2nucol->size());
            util::CreateAssn(evt,
                             *truthcol,
                             *nuchoicecol,
                             *nuchoiceassn,
                             nuchoicecol->size() - 1,
                             nuchoicecol->size());
          }

          // check that the process code is not unsupported by GENIE
          // (see issue #18025 for reference);
          // if it is, print all the information we can about this truth record
          if (truth.NeutrinoSet() &&
              (truth.GetNeutrino().InteractionType() == simb::kNuanceOffset)) {
            mf::LogWarning log("GENIEmissingProcessMapping");
            log << "Found an interaction that is not represented by the interaction type code in "
                   "GENIE:"
                   "\nMCTruth record:"
                   "\n";
            sim::dump::DumpMCTruth(log, truth, 2U); // 2 trajectory points per line
            log << "\nGENIE truth record:"
                   "\n";
            sim::dump::DumpGTruth(log, gTruth);
          } // if

        } // end if genie was able to make an event

      } // end event generation loop

      // check to see if we are to pass empty spills
      if (truthcol->size() < 1 && fPassEmptySpills) {
        MF_LOG_DEBUG("GENIEGen") << "no events made for this spill but "
                                 << "passing it on and ending the event anyway";
        break;
      }

    } // end loop while no interactions are made

    // Create a simulated "beam gate" for these neutrino events.
    // We're creating a vector of these because, in a
    // distant-but-possible future, we may be generating more than one
    // beam gate within a simulated time window.
    gateCollection->push_back(sim::BeamGateInfo(fGlobalTimeOffset, fRandomTimeOffset, fBeamType));

    // put the collections in the event
    evt.put(std::move(truthcol));
    evt.put(std::move(fluxcol));
    evt.put(std::move(gtruthcol));
    evt.put(std::move(tfassn));
    evt.put(std::move(tgtassn));
    evt.put(std::move(gateCollection));

    // dk2nu additions
    if (dk2nuDriver) {
      evt.put(std::move(dk2nucol));
      evt.put(std::move(nuchoicecol));
      evt.put(std::move(dk2nuassn));
      evt.put(std::move(nuchoiceassn));
    }

    return;
  }

  //......................................................................
  std::string GENIEGen::ParticleStatus(int StatusCode)
  {
    int code = StatusCode;
    std::string ParticleStatusName;

    switch (code) {
    case -1: ParticleStatusName = "kIStUndefined"; break;
    case 0: ParticleStatusName = "kIStInitialState"; break;
    case 1: ParticleStatusName = "kIStStableFinalState"; break;
    case 2: ParticleStatusName = "kIStIntermediateState"; break;
    case 3: ParticleStatusName = "kIStDecayedState"; break;
    case 11: ParticleStatusName = "kIStNucleonTarget"; break;
    case 12: ParticleStatusName = "kIStDISPreFragmHadronicState"; break;
    case 13: ParticleStatusName = "kIStPreDecayResonantState"; break;
    case 14: ParticleStatusName = "kIStHadronInTheNucleus"; break;
    case 15: ParticleStatusName = "kIStFinalStateNuclearRemnant"; break;
    case 16: ParticleStatusName = "kIStNucleonClusterTarget"; break;
    default: ParticleStatusName = "Status Unknown";
    }
    return ParticleStatusName;
  }

  //......................................................................
  std::string GENIEGen::ReactionChannel(int ccnc, int mode)
  {
    std::string ReactionChannelName = " ";

    if (ccnc == 0)
      ReactionChannelName = "kCC";
    else if (ccnc == 1)
      ReactionChannelName = "kNC";
    else
      std::cout << "Current mode unknown!! " << std::endl;

    if (mode == 0)
      ReactionChannelName += "_kQE";
    else if (mode == 1)
      ReactionChannelName += "_kRes";
    else if (mode == 2)
      ReactionChannelName += "_kDIS";
    else if (mode == 3)
      ReactionChannelName += "_kCoh";
    else
      std::cout << "interaction mode unknown!! " << std::endl;

    return ReactionChannelName;
  }

  //......................................................................
  void GENIEGen::FillHistograms(simb::MCTruth mc)
  {
    // Decide which histograms to put the spectrum in
    int id = -1;
    if (mc.GetNeutrino().CCNC() == simb::kCC) {
      fCCMode->Fill(mc.GetNeutrino().Mode());
      if (mc.GetNeutrino().Nu().PdgCode() == 12)
        id = 0;
      else if (mc.GetNeutrino().Nu().PdgCode() == -12)
        id = 1;
      else if (mc.GetNeutrino().Nu().PdgCode() == 14)
        id = 2;
      else if (mc.GetNeutrino().Nu().PdgCode() == -14)
        id = 3;
      else
        return;
    }
    else {
      fNCMode->Fill(mc.GetNeutrino().Mode());
      if (mc.GetNeutrino().Nu().PdgCode() > 0)
        id = 4;
      else
        id = 5;
    }
    if (id == -1) abort();

    // Fill the specta histograms
    fGenerated[id]->Fill(mc.GetNeutrino().Nu().E());

    simb::MCNeutrino mcnu = mc.GetNeutrino();
    const simb::MCParticle nu = mcnu.Nu();

    fVertexX->Fill(nu.Vx());
    fVertexY->Fill(nu.Vy());
    fVertexZ->Fill(nu.Vz());

    fVertexXY->Fill(nu.Vx(), nu.Vy());
    fVertexXZ->Fill(nu.Vz(), nu.Vx());
    fVertexYZ->Fill(nu.Vz(), nu.Vy());

    double mom = nu.P();
    if (std::abs(mom) > 0.) {
      fDCosX->Fill(nu.Px() / mom);
      fDCosY->Fill(nu.Py() / mom);
      fDCosZ->Fill(nu.Pz() / mom);
    }

    MF_LOG_DEBUG("GENIEInteractionInformation")
      << std::endl
      << "REACTION:  " << ReactionChannel(mc.GetNeutrino().CCNC(), mc.GetNeutrino().Mode())
      << std::endl
      << "-----------> Particles in the Stack = " << mc.NParticles() << std::endl
      << std::setiosflags(std::ios::left) << std::setw(20) << "PARTICLE"
      << std::setiosflags(std::ios::left) << std::setw(32) << "STATUS" << std::setw(18) << "E (GeV)"
      << std::setw(18) << "m (GeV/c2)" << std::setw(18) << "Ek (GeV)" << std::endl
      << std::endl;

    const TDatabasePDG* databasePDG = TDatabasePDG::Instance();

    // Loop over the particle stack for this event
    for (int i = 0; i < mc.NParticles(); ++i) {
      simb::MCParticle part(mc.GetParticle(i));
      std::string name = databasePDG->GetParticle(part.PdgCode())->GetName();
      int code = part.StatusCode();
      std::string status = ParticleStatus(code);
      double mass = part.Mass();
      double energy = part.E();
      double Ek = (energy - mass); // Kinetic Energy (GeV)
      if (status == "kIStStableFinalState" || status == "kIStHadronInTheNucleus")
        MF_LOG_DEBUG("GENIEFinalState")
          << std::setiosflags(std::ios::left) << std::setw(20) << name
          << std::setiosflags(std::ios::left) << std::setw(32) << status << std::setw(18) << energy
          << std::setw(18) << mass << std::setw(18) << Ek << std::endl;
      else
        MF_LOG_DEBUG("GENIEFinalState")
          << std::setiosflags(std::ios::left) << std::setw(20) << name
          << std::setiosflags(std::ios::left) << std::setw(32) << status << std::setw(18) << energy
          << std::setw(18) << mass << std::endl;
    }

    if (mc.GetNeutrino().CCNC() == simb::kCC) {

      for (int i = 0; i < mc.NParticles(); ++i) {
        simb::MCParticle part(mc.GetParticle(i));
        if (abs(part.PdgCode()) == 11) {
          fEMomentum->Fill(part.P());
          fEDCosX->Fill(part.Px() / part.P());
          fEDCosY->Fill(part.Py() / part.P());
          fEDCosZ->Fill(part.Pz() / part.P());
          fECons->Fill(nu.E() - part.E());
          break;
        }
        else if (abs(part.PdgCode()) == 13) {
          fMuMomentum->Fill(part.P());
          fMuDCosX->Fill(part.Px() / part.P());
          fMuDCosY->Fill(part.Py() / part.P());
          fMuDCosZ->Fill(part.Pz() / part.P());
          fECons->Fill(nu.E() - part.E());
          break;
        }
      } // end loop over particles
    }   //end if CC interaction

    return;
  }

}

namespace evgen {

  DEFINE_ART_MODULE(GENIEGen)

}