MultiEMShowers_module.cc

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// Class:       MultiEMShowers
// Module Type: analyzer
// File:        MultiEMShowers_module.cc
// Author: dorota.stefan@cern.ch robert.sulej@cern.ch

#include "art/Framework/Core/EDAnalyzer.h"
#include "art/Framework/Core/ModuleMacros.h"
#include "art/Framework/Principal/Event.h"
#include "art/Framework/Principal/Handle.h"
#include "art/Framework/Services/Registry/ServiceHandle.h"
#include "art_root_io/TFileService.h"
#include "canvas/Persistency/Common/FindManyP.h"
#include "canvas/Utilities/InputTag.h"
#include "fhiclcpp/ParameterSet.h"
#include "messagefacility/MessageLogger/MessageLogger.h"

#include "larcore/Geometry/Geometry.h"
#include "lardata/DetectorInfoServices/DetectorPropertiesService.h"
#include "lardataobj/RecoBase/Cluster.h"
#include "lardataobj/RecoBase/Hit.h"
#include "lardataobj/RecoBase/Shower.h"
#include "lardataobj/RecoBase/Track.h"
#include "lardataobj/RecoBase/Vertex.h"
#include "larreco/RecoAlg/PMAlg/Utilities.h"
#include "larsim/MCCheater/ParticleInventoryService.h"

#include <algorithm>
#include <limits>
#include <memory>

// ROOT includes
#include "TLorentzVector.h"
#include "TTree.h"

namespace ems {
  class MCinfo;
  class MultiEMShowers;
}

class ems::MCinfo {
public:
  MCinfo();
  void Info();
  void Findtpcborders();

  int GetNgammas() const { return fNgammas; }

  double GetMompi0() const { return fMompi0; }
  double GetMomGamma1() const { return fGammamom1; }
  double GetMomGamma2() const { return fGammamom2; }

  double GetCosine() { return fCosine; }

  TVector3 const& GetPrimary() const { return fPrimary; }
  TVector3 const& GetPospi0() const { return fPi0pos; }
  TVector3 const& GetPosgamma1() const { return fConvgamma1; }
  TVector3 const& GetPosgamma2() const { return fConvgamma2; }

  TVector3 const& GetDirgamma1() const { return fDirgamma1; }
  TVector3 const& GetDirgamma2() const { return fDirgamma2; }

  bool IsInside1() const { return fInside1; }
  bool IsInside2() const { return fInside2; }

  bool IsCompton() const { return fCompton; }

private:
  bool insideFidVol(const TLorentzVector& pvtx) const;
  double fMinx{std::numeric_limits<double>::max()};
  double fMaxx{std::numeric_limits<double>::min()};
  double fMiny{std::numeric_limits<double>::max()};
  double fMaxy{std::numeric_limits<double>::min()};
  double fMinz{std::numeric_limits<double>::max()};
  double fMaxz{std::numeric_limits<double>::min()};

  double fFidVolCut;

  int fNgammas;

  double fMompi0;
  double fGammamom1;
  bool fInside1;
  double fGammamom2;
  bool fInside2;

  double fCosine;

  bool fCompton;

  TVector3 fPrimary;
  TVector3 fPi0pos;
  TVector3 fConvgamma1;
  TVector3 fConvgamma2;
  TVector3 fDirgamma1;
  TVector3 fDirgamma2;
};

ems::MCinfo::MCinfo() : fFidVolCut(2.0)
{
  Info();
  Findtpcborders();
}

void ems::MCinfo::Findtpcborders()
{
  art::ServiceHandle<geo::Geometry const> geom;
  for (const geo::TPCGeo& tpcg : geom->Iterate<geo::TPCGeo>()) {
    fMinx = std::min(fMinx, tpcg.MinX());
    fMaxx = std::max(fMaxx, tpcg.MaxX());
    fMiny = std::min(fMiny, tpcg.MinY());
    fMaxy = std::max(fMaxy, tpcg.MaxY());
    fMinz = std::min(fMinz, tpcg.MinZ());
    fMaxz = std::max(fMaxz, tpcg.MaxZ());
  }
}

void ems::MCinfo::Info()
{
  fMompi0 = 0.0;
  fPi0pos.SetXYZ(0, 0, 0);
  fNgammas = 0;
  fCosine = 0.0;
  fInside1 = false;
  fInside2 = false;
  fCompton = false;

  fGammamom1 = 0.0;
  fGammamom2 = 0.0;
  fConvgamma1.SetXYZ(0, 0, 0);
  fConvgamma2.SetXYZ(0, 0, 0);
  fDirgamma1.SetXYZ(0, 0, 0);
  fDirgamma2.SetXYZ(0, 0, 0);

  art::ServiceHandle<cheat::ParticleInventoryService const> pi_serv;
  const sim::ParticleList& plist = pi_serv->ParticleList();
  for (sim::ParticleList::const_iterator ipar = plist.begin(); ipar != plist.end(); ++ipar) {
    const simb::MCParticle* particle = ipar->second;

    if (particle->Process() != "primary") continue;

    TLorentzVector posvec = particle->Position();
    TVector3 pose(posvec.X(), posvec.Y(), posvec.Z());
    fPrimary = pose;

    if (particle->PdgCode() == 111) {
      fMompi0 = particle->P();

      TLorentzVector posvec3 = particle->Position();
      TVector3 pospi0(posvec3.X(), posvec3.Y(), posvec3.Z());
      fPi0pos = pospi0;

      if (particle->NumberDaughters() != 2) continue;

      const simb::MCParticle* daughter1 = pi_serv->TrackIdToParticle_P(particle->Daughter(0));
      if (daughter1->PdgCode() != 22) continue;

      const simb::MCParticle* daughter2 = pi_serv->TrackIdToParticle_P(particle->Daughter(1));
      if (daughter2->PdgCode() != 22) continue;

      fNgammas = particle->NumberDaughters();
      TLorentzVector mom1 = pi_serv->TrackIdToParticle_P(particle->Daughter(0))->Momentum();
      TLorentzVector mom2 = pi_serv->TrackIdToParticle_P(particle->Daughter(1))->Momentum();

      // compton process
      if (daughter1->EndProcess() == "phot") fCompton = true;
      if (daughter2->EndProcess() == "phot") fCompton = true;

      TVector3 mom1vec3(mom1.Px(), mom1.Py(), mom1.Pz());
      fGammamom1 = pi_serv->TrackIdToParticle_P(particle->Daughter(0))->P();
      TVector3 mom2vec3(mom2.Px(), mom2.Py(), mom2.Pz());
      fGammamom2 = pi_serv->TrackIdToParticle_P(particle->Daughter(1))->P();

      TLorentzVector pos1 = pi_serv->TrackIdToParticle_P(particle->Daughter(0))->EndPosition();
      TLorentzVector pos2 = pi_serv->TrackIdToParticle_P(particle->Daughter(1))->EndPosition();

      if (insideFidVol(pos1)) fInside1 = true;
      if (insideFidVol(pos2)) fInside2 = true;

      fConvgamma1.SetXYZ(pos1.X(), pos1.Y(), pos1.Z());
      fConvgamma2.SetXYZ(pos2.X(), pos2.Y(), pos2.Z());

      TVector3 vecnorm1 = mom1vec3.Unit();
      fDirgamma1 = vecnorm1;
      TVector3 vecnorm2 = mom2vec3.Unit();
      fDirgamma2 = vecnorm2;

      fCosine = fDirgamma1 * fDirgamma2;
    }
    else {
      fNgammas = particle->NumberDaughters();
    }
  }
}

bool ems::MCinfo::insideFidVol(const TLorentzVector& pvtx) const
{

  bool inside = false;
  //x
  double dista = fabs(fMinx - pvtx.X());
  double distb = fabs(pvtx.X() - fMaxx);
  if ((pvtx.X() > fMinx) && (pvtx.X() < fMaxx) && (dista > fFidVolCut) && (distb > fFidVolCut))
    inside = true;
  //y
  dista = fabs(fMaxy - pvtx.Y());
  distb = fabs(pvtx.Y() - fMiny);
  if (inside && (pvtx.Y() > fMiny) && (pvtx.Y() < fMaxy) && (dista > fFidVolCut) &&
      (distb > fFidVolCut))
    inside = true;
  else
    inside = false;

  //z
  dista = fabs(fMaxz - pvtx.Z());
  distb = fabs(pvtx.Z() - fMinz);
  if (inside && (pvtx.Z() > fMinz) && (pvtx.Z() < fMaxz) && (dista > fFidVolCut) &&
      (distb > fFidVolCut))
    inside = true;
  else
    inside = false;

  return inside;
}

class ems::MultiEMShowers : public art::EDAnalyzer {
public:
  explicit MultiEMShowers(fhicl::ParameterSet const& p);

  MultiEMShowers(MultiEMShowers const&) = delete;
  MultiEMShowers(MultiEMShowers&&) = delete;
  MultiEMShowers& operator=(MultiEMShowers const&) = delete;
  MultiEMShowers& operator=(MultiEMShowers&&) = delete;

private:
  void beginJob() override;
  void endJob() override;

  void analyze(art::Event const& e) override;

  bool convCluster(art::Event const& evt);
  double getMinDist(detinfo::DetectorPropertiesData const& detProp,
                    std::vector<art::Ptr<recob::Hit>> const& v,
                    TVector3 const& convmc,
                    size_t view,
                    size_t tpc,
                    size_t cryo);
  int fConvGood;
  int fConvWrong;
  int fConvBothGood;
  int fGammasInside;

  // ROOT
  TTree* fEvTree;
  int fEvNumber;
  int fNGroups;

  // mc
  double fPi0mom;
  double fGmom1;
  double fGmom2;
  double fMcth;
  int fNgammas;
  int fEvFidVol;
  int fEvComp;
  int fEvGMomCut;
  int fEvInput;
  TVector3 fGdir1;
  TVector3 fGdir2;
  TVector3 fPrimary;

  //reco
  int fEvReco;
  int fEv2Groups;
  int fEv2Good;
  int fCountph;
  int fCountreco;

  TTree* fShTree;
  TTree* fRecoTree;
  double fStartX;
  double fStartY;
  double fStartZ;
  double fDedxZ;
  double fDedxV;
  double fDedxU;
  double fMCrecovtx;
  double fMCrecoTh;
  double fMCrecovtxgood;
  double fMCrecoThgood;
  double fRecth;
  double fRecthgood;
  double fDistConvrecomc1;
  double fDistConvrecomc2;
  double fGdirmcreco1;
  double fGdirmcreco2;
  double fGdirmcreco1good;
  double fGdirmcreco2good;

  art::InputTag fHitsModuleLabel;
  art::InputTag fCluModuleLabel;
  art::InputTag fTrk3DModuleLabel;
  art::InputTag fVtxModuleLabel;
  art::InputTag fShsModuleLabel;
};

ems::MultiEMShowers::MultiEMShowers(fhicl::ParameterSet const& p) : EDAnalyzer(p)
{
  fConvGood = 0;
  fConvWrong = 0;
  fConvBothGood = 0;
  fEvFidVol = 0;
  fEvComp = 0;
  fEvGMomCut = 0;
  fEvReco = 0;
  fEvInput = 0;
  fEv2Groups = 0;
  fEv2Good = 0;
  fHitsModuleLabel = p.get<art::InputTag>("HitsModuleLabel");
  fCluModuleLabel = p.get<art::InputTag>("ClustersModuleLabel");
  fTrk3DModuleLabel = p.get<art::InputTag>("Trk3DModuleLabel");
  fVtxModuleLabel = p.get<art::InputTag>("VtxModuleLabel");
  fShsModuleLabel = p.get<art::InputTag>("ShsModuleLabel");
}

void ems::MultiEMShowers::beginJob()
{
  art::ServiceHandle<art::TFileService const> tfs;

  fEvTree = tfs->make<TTree>("MultiShowers", "showers3d");
  fEvTree->Branch("fEvNumber", &fEvNumber, "fEvNumber/I");
  fEvTree->Branch("fNGroups", &fNGroups, "fNGroups/I");
  fEvTree->Branch("fPi0mom", &fPi0mom, "fPi0mom/D");
  fEvTree->Branch("fNgammas", &fNgammas, "fNgammas/I");
  fEvTree->Branch("fGmom1", &fGmom1, "fGmom1/D");
  fEvTree->Branch("fGmom2", &fGmom2, "fGmom2/D");
  fEvTree->Branch("fMcth", &fMcth, "fMcth/D");
  fEvTree->Branch("fRecth", &fRecth, "fRecth/D");
  fEvTree->Branch("fMCrecovtx", &fMCrecovtx, "fMCrecovtx/D");
  fEvTree->Branch("fMCrecoTh", &fMCrecoTh, "fMCrecoTh/D");
  fEvTree->Branch("fConvGood", &fConvGood, "fConvGood/I");
  fEvTree->Branch("fConvWrong", &fConvWrong, "fConvWrong/I");
  fEvTree->Branch("fConvBothGood", &fConvBothGood, "fConvBothGood/I");
  fEvTree->Branch("fGammasInside", &fGammasInside, "fGammasInside/I");
  fEvTree->Branch("fCountph", &fCountph, "fCountph/I");
  fEvTree->Branch("fCountreco", &fCountreco, "fCountreco/I");

  fRecoTree = tfs->make<TTree>("Cascades", "conv points");
  fRecoTree->Branch("fRecth", &fRecth, "fRecth/D");
  fRecoTree->Branch("fMCrecovtx", &fMCrecovtx, "fMCrecovtx/D");
  fRecoTree->Branch("fMCrecoTh", &fMCrecoTh, "fMCrecoTh/D");
  fRecoTree->Branch("fRecthgood", &fRecthgood, "fRecthgood/D");
  fRecoTree->Branch("fMCrecovtxgood", &fMCrecovtxgood, "fMCrecovtxgood/D");
  fRecoTree->Branch("fMCrecoThgood", &fMCrecoThgood, "fMCrecoThgood/D");
  fRecoTree->Branch("fGdirmcreco1", &fGdirmcreco1, "fGdirmcreco1/D");
  fRecoTree->Branch("fGdirmcreco2", &fGdirmcreco2, "fGdirmcreco2/D");
  fRecoTree->Branch("fGdirmcreco1good", &fGdirmcreco1good, "fGdirmcreco1good/D");
  fRecoTree->Branch("fGdirmcreco2good", &fGdirmcreco2good, "fGdirmcreco2good/D");

  fShTree = tfs->make<TTree>("Shower", "conv point");

  fShTree->Branch("fStartX", &fStartX, "fStartX/D");
  fShTree->Branch("fStartY", &fStartY, "fStartY/D");
  fShTree->Branch("fStartZ", &fStartZ, "fStartZ/D");
  fShTree->Branch("fDedxZ", &fDedxZ, "fDedxZ/D");
  fShTree->Branch("fDedxV", &fDedxV, "fDedxV/D");
  fShTree->Branch("fDedxU", &fDedxU, "fDedxU/D");
}

void ems::MultiEMShowers::endJob()
{
  mf::LogInfo log("MultiEMShower");
  log << "******************** fEvFidVol =  " << fEvFidVol << "\n";
  log << "******************** fEvGMomCut = " << fEvGMomCut << "\n";
  log << "******************** fEvComp =    " << fEvComp << "\n";
  log << "******************** fEvReco =    " << fEvReco << "\n";
  log << "******************** fEvInput =   " << fEvInput << "\n";
  log << "******************** fEv2Groups = " << fEv2Groups << "\n";
  log << "******************** fEv2Good =   " << fEv2Good << "\n";
  if (fEvInput)
    log << "******************** reco %  =    " << double(fEvReco) / double(fEvInput) << "\n";
}

void ems::MultiEMShowers::analyze(art::Event const& e)
{
  fEvNumber = e.id().event();
  fNGroups = 0;
  fStartX = 0.0;
  fStartY = 0.0;
  fStartZ = 0.0;
  fPi0mom = 0.0;
  fNgammas = 0;
  fDistConvrecomc1 = 0.0;
  fDistConvrecomc2 = 0.0;
  fMCrecovtx = -400.0;
  fMCrecovtxgood = -400.0;
  fRecth = -400.0;
  fRecthgood = -400.0;
  fMCrecoTh = -400.0;
  fMCrecoThgood = -400.0;
  fGammasInside = 0;
  fCountph = 0;
  fCountreco = 0;
  fGdirmcreco1 = 0.0;
  fGdirmcreco2 = 0.0;
  fGdirmcreco1good = 0.0;
  fGdirmcreco2good = 0.0;
  fDedxZ = 0.0;
  fDedxV = 0.0;
  fDedxU = 0.0;

  ems::MCinfo mc;
  fPrimary = mc.GetPrimary();
  fPi0mom = mc.GetMompi0();
  fGmom1 = mc.GetMomGamma1();
  fGmom2 = mc.GetMomGamma2();
  fGdir1 = mc.GetDirgamma1();
  fGdir2 = mc.GetDirgamma2();
  fNgammas = mc.GetNgammas();
  TVector3 pospi0 = mc.GetPospi0();

  double cosinemc = mc.GetCosine();
  fMcth = 180.0F * (std::acos(cosinemc)) / TMath::Pi();
  TVector3 convp[2];
  convp[0] = mc.GetPosgamma1();
  convp[1] = mc.GetPosgamma2();
  const double maxdist = 2.0; //cm

  // check whether two photons are inside fid vol
  if (mc.IsInside1() && mc.IsInside2()) {
    fGammasInside = 1;
    fEvFidVol++;
  }

  if ((fGmom1 > 0.1) && (fGmom2 > 0.1)) fEvGMomCut++;

  if (mc.IsCompton()) fEvComp++;

  art::Handle<std::vector<recob::Shower>> shsListHandle;
  art::Handle<std::vector<recob::Track>> trkListHandle;
  art::Handle<std::vector<recob::Vertex>> vtxListHandle;
  art::Handle<std::vector<recob::Cluster>> cluListHandle;
  art::Handle<std::vector<recob::Hit>> hitListHandle;
  if (e.getByLabel(fShsModuleLabel, shsListHandle) &&
      e.getByLabel(fTrk3DModuleLabel, trkListHandle) &&
      e.getByLabel(fVtxModuleLabel, vtxListHandle) &&
      e.getByLabel(fCluModuleLabel, cluListHandle) &&
      e.getByLabel(fHitsModuleLabel, hitListHandle)) {
    art::FindManyP<recob::Cluster> cluFromShs(shsListHandle, e, fShsModuleLabel);
    art::FindManyP<recob::Cluster> cluFromTrk(trkListHandle, e, fTrk3DModuleLabel);
    art::FindManyP<recob::Vertex> vtxFromTrk(trkListHandle, e, fVtxModuleLabel);
    art::FindManyP<recob::Hit> hitFromClu(cluListHandle, e, fCluModuleLabel);

    fNGroups = shsListHandle->size();

    fCountph = 0;
    if (fNgammas == 2) // pi0
    {
      int idph = -1;
      for (size_t s = 0; s < shsListHandle->size(); ++s) {
        const recob::Shower& sh = (*shsListHandle)[s];
        double mindist = maxdist;
        bool found = false;

        for (int i = 0; i < fNgammas; ++i) {
          double dist = sqrt(pma::Dist2(sh.ShowerStart(), convp[i]));
          if ((dist < mindist) && (idph != i)) {
            mindist = dist;
            idph = i;
            found = true;
          }
        }
        if (found) {
          fConvGood++;
          fCountph++;
        }
        else {
          fConvWrong++;
        }
      }
      if (fCountph == 2) fConvBothGood++;

      // plot a few variables if there are 2 showers
      if (fCountph == 2)
        for (size_t s = 0; s < shsListHandle->size(); ++s) {
          const recob::Shower& sh = (*shsListHandle)[s];
          TVector3 pos = sh.ShowerStart();
          fStartX = pos.X();
          fStartY = pos.Y();
          fStartZ = pos.Z();
          std::vector<double> const& vecdedx = sh.dEdx();

          if (vecdedx.size() == 3) {
            fDedxZ = vecdedx[0];
            fDedxV = vecdedx[1];
            fDedxU = vecdedx[2];
          }

          fShTree->Fill();
        }
    }
    else // other than pi0
    {
      for (size_t s = 0; s < shsListHandle->size(); ++s) {
        const recob::Shower& sh = (*shsListHandle)[s];
        double mindist = maxdist;

        double dist = sqrt(pma::Dist2(sh.ShowerStart(), fPrimary));
        if (dist < mindist) {
          TVector3 pos = sh.ShowerStart();
          fStartX = pos.X();
          fStartY = pos.Y();
          fStartZ = pos.Z();
          std::vector<double> vecdedx = sh.dEdx();
          if (vecdedx.size() == 3) {
            fDedxZ = vecdedx[0];
            fDedxV = vecdedx[1];
            fDedxU = vecdedx[2];
          }
        }

        fShTree->Fill();
      }
    }
    // compute the crossing point

    //cut from mc and clusters

    if (mc.IsInside1() && mc.IsInside2() && (fGmom1 > 0.1) && (fGmom2 > 0.1) && (!mc.IsCompton()) &&
        convCluster(e)) {
      fCountreco = 1;
      if (fNGroups == 2) fEv2Groups++;
      if ((fNGroups == 2) && (fCountph == 2)) fEv2Good++;
      // cut from reco
      //if (countph == 2)
      if (fNGroups == 2) {
        std::vector<std::pair<TVector3, TVector3>> lines;
        const recob::Shower& sh1 = (*shsListHandle)[0];
        const recob::Shower& sh2 = (*shsListHandle)[1];

        std::pair<TVector3, TVector3> frontback1(sh1.ShowerStart(),
                                                 sh1.ShowerStart() + sh1.Direction());
        std::pair<TVector3, TVector3> frontback2(sh2.ShowerStart(),
                                                 sh2.ShowerStart() + sh2.Direction());
        lines.push_back(frontback1);
        lines.push_back(frontback2);

        TVector3 result;
        pma::SolveLeastSquares3D(lines, result); // mse.

        double dist1_0 = pma::Dist2(result, sh1.ShowerStart());
        double dist2_0 = pma::Dist2(result, sh1.ShowerStart() + sh1.Direction());
        double dist1_1 = pma::Dist2(result, sh2.ShowerStart());
        double dist2_1 = pma::Dist2(result, sh2.ShowerStart() + sh2.Direction());
        if ((dist1_0 > dist2_0) || (dist1_1 > dist2_1)) {}
        else {
          fMCrecovtx = std::sqrt(pma::Dist2(pospi0, result));

          if (fCountph == 2) fMCrecovtxgood = fMCrecovtx;

          double cosine_reco = sh1.Direction() * sh2.Direction();
          fRecth = 180.0F * (std::acos(cosine_reco)) / TMath::Pi();

          fGdirmcreco1 = fGdir1 * sh1.Direction();
          fGdirmcreco2 = fGdir2 * sh2.Direction();
          if (fCountph == 2) {
            fGdirmcreco1good = fGdirmcreco1;
            fGdirmcreco2good = fGdirmcreco2;
          }

          if (fCountph == 2) fRecthgood = fRecth;

          fMCrecoTh = fRecth - fMcth;

          if (fCountph == 2) fMCrecoThgood = fMCrecoTh;

          fEvReco++;
          fRecoTree->Fill();
        }
      }
      fEvInput++;
      //fRecoTree->Fill();
    }
  }

  fEvTree->Fill();
}

// true if there are clusters corresponding to mc conversion points
bool ems::MultiEMShowers::convCluster(art::Event const& evt)
{
  ems::MCinfo mc;
  TVector3 const convp[2]{mc.GetPosgamma1(), mc.GetPosgamma2()};

  geo::Point_t const vtx{convp[0].X(), convp[0].Y(), convp[0].Z()};

  art::ServiceHandle<geo::Geometry const> geom;
  geo::TPCID idtpc = geom->FindTPCAtPosition(vtx);
  size_t cryoid = geom->PositionToCryostatID(vtx).Cryostat;

  art::Handle<std::vector<recob::Hit>> hitListHandle;
  art::Handle<std::vector<recob::Cluster>> cluListHandle;

  //map: conversion point, vec of id clusters in each view
  std::map<size_t, std::vector<size_t>> used;

  art::FindManyP<recob::Hit> fbc(cluListHandle, evt, fCluModuleLabel);

  auto const detProp = art::ServiceHandle<detinfo::DetectorPropertiesService const>()->DataFor(evt);
  double maxdist = 1.0; // 1 cm
  if (geom->HasTPC(idtpc)) {
    const geo::CryostatGeo& cryostat = geom->Cryostat(geo::CryostatID(cryoid));
    if (evt.getByLabel(fHitsModuleLabel, hitListHandle) &&
        evt.getByLabel(fCluModuleLabel, cluListHandle)) {
      size_t conv = 0;
      while (conv < 2) {
        for (size_t view = 0; view < cryostat.MaxPlanes(); view++) {

          double mindist = maxdist;
          int clid = 0;
          for (size_t c = 0; c < cluListHandle->size(); ++c) {

            bool exist = false;
            for (auto const& ids : used)
              for (auto i : ids.second)
                if (i == c) exist = true;
            if (exist) continue;

            std::vector<art::Ptr<recob::Hit>> hits = fbc.at(c);
            if (hits.size() < 20) continue;
            if (hits[0]->WireID().Plane != view) continue;

            double dist = getMinDist(detProp, hits, convp[conv], view, idtpc.TPC, cryoid);
            if (dist < mindist) {
              mindist = dist;
              clid = c;
            }
          }
          if (mindist < maxdist) used[conv].push_back(clid);
        }
        conv++;
      }
    }
  }
  bool result = false;

  if (used.size() > 1)
    for (auto const& ids : used) {
      if (ids.second.size() > 1)
        result = true;
      else {
        result = false;
        break;
      }
    }

  return result;
}

double ems::MultiEMShowers::getMinDist(detinfo::DetectorPropertiesData const& detProp,
                                       std::vector<art::Ptr<recob::Hit>> const& v,
                                       TVector3 const& convmc,
                                       size_t view,
                                       size_t tpc,
                                       size_t cryo)
{
  double mindist = 9999;
  // MC vertex projected to view
  TVector2 proj = pma::GetProjectionToPlane(convmc, view, tpc, cryo);

  // loop over hits to find the closest to MC 2d vtx
  for (size_t h = 0; h < v.size(); ++h) {
    if ((v[h]->WireID().Plane == view) && (v[h]->WireID().TPC == tpc)) {
      TVector2 hpoint =
        pma::WireDriftToCm(detProp, v[h]->WireID().Wire, v[h]->PeakTime(), view, tpc, cryo);

      double dist = pma::Dist2(proj, hpoint);
      if (dist < mindist) { mindist = dist; }
    }
  }

  return mindist;
}

DEFINE_ART_MODULE(ems::MultiEMShowers)