CosmicMuonGenerator.cc

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// modified by P. Biallass 29.03.2006 to implement new cosmic generator (CMSCGEN.cc) and new normalization of flux (CMSCGENnorm.cc)
// 04.12.2008 sonne: replaced Min/MaxE by Min/MaxP to get cos_sf/ug scripts working again
// 20.04.2009 sonne: Implemented mechanism to read in multi muon events and propagate each muon
#define sim_cxx
 
#include "GeneratorInterface/CosmicMuonGenerator/interface/CosmicMuonGenerator.h"
 
void CosmicMuonGenerator::runCMG() {
  initialize();
  for (unsigned int iGen = 0; iGen < NumberOfEvents; ++iGen) {
    nextEvent();
  }
  terminate();
}
 
void CosmicMuonGenerator::setRandomEngine(CLHEP::HepRandomEngine* v) {
  if (delRanGen)
    delete RanGen;
  RanGen = v;
  delRanGen = false;
  Cosmics->setRandomEngine(v);
}
 
void CosmicMuonGenerator::initialize(CLHEP::HepRandomEngine* rng) {
  if (delRanGen)
    delete RanGen;
  if (!rng) {
    RanGen = new CLHEP::HepJamesRandom;
    RanGen->setSeed(RanSeed, 0);  //set seed for Random Generator (seed can be controled by config-file)
    delRanGen = true;
  } else {
    RanGen = rng;
    delRanGen = false;
  }
  checkIn();
  if (NumberOfEvents > 0) {
    // set up "surface geometry" dimensions
    double RadiusTargetEff = RadiusOfTarget;  //get this from cfg-file
    double Z_DistTargetEff = ZDistOfTarget;   //get this from cfg-file
    //double Z_CentrTargetEff = ZCentrOfTarget;  //get this from cfg-file
    if (TrackerOnly == true) {
      RadiusTargetEff = RadiusTracker;
      Z_DistTargetEff = Z_DistTracker;
    }
    Target3dRadius = sqrt(RadiusTargetEff * RadiusTargetEff + Z_DistTargetEff * Z_DistTargetEff) + MinStepSize;
    if (Debug)
      std::cout << "  radius of sphere  around  target = " << Target3dRadius << " mm" << std::endl;
 
    if (MinTheta > 90. * Deg2Rad)  //upgoing muons from neutrinos
      SurfaceRadius = (RadiusCMS) * (-tan(MinTheta)) + MinStepSize;
    else
      SurfaceRadius = (SurfaceOfEarth + PlugWidth + RadiusTargetEff) * tan(MaxTheta) + Target3dRadius;
    if (Debug)
      std::cout << "  starting point radius at Surface + PlugWidth = " << SurfaceRadius << " mm" << std::endl;
 
    OneMuoEvt.PlugVx = PlugVx;
    OneMuoEvt.PlugVz = PlugVz;
    OneMuoEvt.RhoAir = RhoAir;
    OneMuoEvt.RhoWall = RhoWall;
    OneMuoEvt.RhoRock = RhoRock;
    OneMuoEvt.RhoClay = RhoClay;
    OneMuoEvt.RhoPlug = RhoPlug;
    //set energy and angle limits for CMSCGEN, give same seed as above
    if (MinTheta >= 90. * Deg2Rad)  //upgoing muons from neutrinos
      Cosmics->initializeNuMu(MinP, MaxP, MinTheta, MaxTheta, MinEnu, MaxEnu, MinPhi, MaxPhi, NuProdAlt, RanGen);
    else
      Cosmics->initialize(MinP, MaxP, MinTheta, MaxTheta, RanGen, TIFOnly_constant, TIFOnly_linear);
 
#if ROOT_INTERACTIVE
    // book histos
    TH1D* ene = new TH1D("ene", "generated energy", 210, 0., 1050.);
    TH1D* the = new TH1D("the", "generated theta", 90, 0., 90.);
    TH1D* phi = new TH1D("phi", "generated phi", 120, 0., 360.);
    TH3F* ver = new TH3F("ver", "Z-X-Y coordinates", 100, -25., 25., 20, -10., 10., 40, -10., 10.);
#endif
    if (EventDisplay)
      initEvDis();
    std::cout << std::endl;
 
    if (MultiMuon) {
      MultiIn = nullptr;
 
      std::cout << "MultiMuonFileName.c_str()=" << MultiMuonFileName.c_str() << std::endl;
      MultiIn = new TFile(MultiMuonFileName.c_str());
 
      if (!MultiIn)
        std::cout << "MultiMuon=True: MultiMuonFileName='" << MultiMuonFileName.c_str() << "' does not exist"
                  << std::endl;
      else
        std::cout << "MultiMuonFile: " << MultiMuonFileName.c_str() << " opened!" << std::endl;
      //MultiTree = (TTree*) gDirectory->Get("sim");
      MultiTree = (TTree*)MultiIn->Get("sim");
      SimTree = new sim(MultiTree);
      SimTree->Init(MultiTree);
      SimTreeEntries = SimTree->fChain->GetEntriesFast();
      std::cout << "SimTreeEntries=" << SimTreeEntries << std::endl;
 
      if (MultiMuonFileFirstEvent <= 0)
        SimTree_jentry = 0;
      else
        SimTree_jentry = MultiMuonFileFirstEvent - 1;  //1=1st evt (SimTree_jentry=0)
 
      NcloseMultiMuonEvents = 0;
      NskippedMultiMuonEvents = 0;
    }
 
    if (!MultiMuon || (MultiMuon && MultiIn))
      NotInitialized = false;
  }
}
 
void CosmicMuonGenerator::nextEvent() {
  double E = 0.;
  double Theta = 0.;
  double Phi = 0.;
  double RxzV = 0.;
  double PhiV = 0.;
  if (int(Nsel) % 100 == 0)
    std::cout << "    generated " << int(Nsel) << " events" << std::endl;
  // generate cosmic (E,theta,phi)
  bool notSelected = true;
  while (notSelected) {
    bool badMomentumGenerated = true;
    while (badMomentumGenerated) {
      if (MinTheta > 90. * Deg2Rad)  //upgoing muons from neutrinos
        Cosmics->generateNuMu();
      else
        Cosmics->generate();  //dice one event now
 
      E = sqrt(Cosmics->momentum_times_charge() * Cosmics->momentum_times_charge() + MuonMass * MuonMass);
      Theta = TMath::ACos(Cosmics->cos_theta());  //angle has to be in RAD here
      Ngen += 1.;  //count number of initial cosmic events (in surface area), vertices will be added later
      badMomentumGenerated = false;
      Phi = RanGen->flat() * (MaxPhi - MinPhi) + MinPhi;
    }
    Norm->events_n100cos(E, Theta);  //test if this muon is in normalization range
    Ndiced += 1;                     //one more cosmic is diced
 
    // generate vertex
    double Nver = 0.;
    bool badVertexGenerated = true;
    while (badVertexGenerated) {
      RxzV = sqrt(RanGen->flat()) * SurfaceRadius;
      PhiV = RanGen->flat() * TwoPi;
      // check phi range (for a sphere with Target3dRadius around the target)
      double dPhi = Pi;
      if (RxzV > Target3dRadius)
        dPhi = asin(Target3dRadius / RxzV);
      double rotPhi = PhiV + Pi;
      if (rotPhi > TwoPi)
        rotPhi -= TwoPi;
      double disPhi = std::fabs(rotPhi - Phi);
      if (disPhi > Pi)
        disPhi = TwoPi - disPhi;
      if (disPhi < dPhi || AcptAllMu)
        badVertexGenerated = false;
      Nver += 1.;
    }
    Ngen += (Nver - 1.);  //add number of generated vertices to initial cosmic events
 
    // complete event at surface
    int id = 13;  // mu-
    if (Cosmics->momentum_times_charge() > 0.)
      id = -13;  // mu+
    double absMom = sqrt(E * E - MuonMass * MuonMass);
    double verMom = absMom * cos(Theta);
    double horMom = absMom * sin(Theta);
    double Px = horMom * sin(Phi);  // [GeV/c]
    double Py = -verMom;            // [GeV/c]
    double Pz = horMom * cos(Phi);  // [GeV/c]
    double Vx = RxzV * sin(PhiV);   // [mm]
 
    double Vy;
    if (MinTheta > 90. * Deg2Rad)  //upgoing muons from neutrinos
      Vy = -RadiusCMS;
    else
      Vy = SurfaceOfEarth + PlugWidth;  // [mm]
 
    double Vz = RxzV * cos(PhiV);                                           // [mm]
    double T0 = (RanGen->flat() * (MaxT0 - MinT0) + MinT0) * SpeedOfLight;  // [mm/c];
 
    Id_at = id;
    Px_at = Px;
    Py_at = Py;
    Pz_at = Pz;
    E_at = E;  //M_at = MuonMass;
    Vx_at = Vx;
    Vy_at = Vy;
    Vz_at = Vz;
    T0_at = T0;
 
    OneMuoEvt.create(id, Px, Py, Pz, E, MuonMass, Vx, Vy, Vz, T0);
    // if angles are ok, propagate to target
    if (goodOrientation()) {
      if (MinTheta > 90. * Deg2Rad)  //upgoing muons from neutrinos
        OneMuoEvt.propagate(0., RadiusOfTarget, ZDistOfTarget, ZCentrOfTarget, TrackerOnly, MTCCHalf);
      else
        OneMuoEvt.propagate(ElossScaleFactor, RadiusOfTarget, ZDistOfTarget, ZCentrOfTarget, TrackerOnly, MTCCHalf);
    }
 
    if ((OneMuoEvt.hitTarget() && sqrt(OneMuoEvt.e() * OneMuoEvt.e() - MuonMass * MuonMass) > MinP_CMS) ||
        AcptAllMu == true) {
      Nsel += 1.;  //count number of generated and accepted events
      notSelected = false;
    }
  }
 
  EventWeight = 1.;
 
  //just one outgoing particle at SurFace
  Id_sf.resize(1);
  Px_sf.resize(1);
  Py_sf.resize(1);
  Pz_sf.resize(1);
  E_sf.resize(1);
  //M_sf.resize(1);
  Vx_sf.resize(1);
  Vy_sf.resize(1);
  Vz_sf.resize(1);
  T0_sf.resize(1);
 
  Id_sf[0] = Id_at;
  Px_sf[0] = Px_at;
  Py_sf[0] = Py_at;
  Pz_sf[0] = Pz_at;
  E_sf[0] = E_at;  //M_fs[0] = MuonMass;
  Vx_sf[0] = Vx_at;
  Vy_sf[0] = Vy_at;
  Vz_sf[0] = Vz_at;
  T0_sf[0] = T0_at;
 
  //just one particle at UnderGround
  Id_ug.resize(1);
  Px_ug.resize(1);
  Py_ug.resize(1);
  Pz_ug.resize(1);
  E_ug.resize(1);
  //M_ug.resize(1);
  Vx_ug.resize(1);
  Vy_ug.resize(1);
  Vz_ug.resize(1);
  T0_ug.resize(1);
 
  Id_ug[0] = OneMuoEvt.id();
  Px_ug[0] = OneMuoEvt.px();
  Py_ug[0] = OneMuoEvt.py();
  Pz_ug[0] = OneMuoEvt.pz();
  E_ug[0] = OneMuoEvt.e();
  //M_ug[0] = OneMuoEvt.m();
  Vx_ug[0] = OneMuoEvt.vx();
  Vy_ug[0] = OneMuoEvt.vy();
  Vz_ug[0] = OneMuoEvt.vz();
  T0_ug[0] = OneMuoEvt.t0();
 
  // plot variables of selected events
#if ROOT_INTERACTIVE
  ene->Fill(OneMuoEvt.e());
  the->Fill((OneMuoEvt.theta() * Rad2Deg));
  phi->Fill((OneMuoEvt.phi() * Rad2Deg));
  ver->Fill((OneMuoEvt.vz() / 1000.), (OneMuoEvt.vx() / 1000.), (OneMuoEvt.vy() / 1000.));
#endif
  if (Debug) {
    std::cout << "new event" << std::endl;
    std::cout << "  Px,Py,Pz,E,m = " << OneMuoEvt.px() << ", " << OneMuoEvt.py() << ", " << OneMuoEvt.pz() << ", "
              << OneMuoEvt.e() << ", " << OneMuoEvt.m() << " GeV" << std::endl;
    std::cout << "  Vx,Vy,Vz,t0  = " << OneMuoEvt.vx() << ", " << OneMuoEvt.vy() << ", " << OneMuoEvt.vz() << ", "
              << OneMuoEvt.t0() << " mm" << std::endl;
  }
  if (EventDisplay)
    displayEv();
}
 
bool CosmicMuonGenerator::nextMultiEvent() {
  if (Debug)
    std::cout << "\nEntered CosmicMuonGenerator::nextMultiEvent()" << std::endl;
  bool EvtRejected = true;
  bool MuInMaxDist = false;
  double MinDist;  //[mm]
 
  while (EvtRejected) {
    //read in event from SimTree
    //ULong64_t ientry = SimTree->LoadTree(SimTree_jentry);
    Long64_t ientry = SimTree->GetEntry(SimTree_jentry);
    std::cout << "CosmicMuonGenerator::nextMultiEvent(): SimTree_jentry="
              << SimTree_jentry
              //<< " ientry=" << ientry
              << " SimTreeEntries=" << SimTreeEntries << std::endl;
    if (ientry < 0)
      return false;  //stop run
    if (SimTree_jentry < SimTreeEntries) {
      SimTree_jentry++;
    } else {
      std::cout << "CosmicMuonGenerator.cc::nextMultiEvent: No more events in file!" << std::endl;
      return false;  //stop run
    }
 
    int nmuons = SimTree->shower_nParticlesWritten;
    if (nmuons < MultiMuonNmin) {
      std::cout << "CosmicMuonGenerator.cc: Warning!  Less than " << MultiMuonNmin << " muons in event!" << std::endl;
      std::cout << "trying next event from file" << std::endl;
      NskippedMultiMuonEvents++;
      continue;  //EvtRejected while loop: get next event from file
    }
 
    Px_mu.resize(nmuons);
    Py_mu.resize(nmuons);
    Pz_mu.resize(nmuons);
    P_mu.resize(nmuons);
 
    MinDist = 99999.e9;  //[mm]
    double MuMuDist;
    MuInMaxDist = false;
    //check if at least one muon pair closer than 30m at surface
    int NmuPmin = 0;
    for (int imu = 0; imu < nmuons; ++imu) {
      Px_mu[imu] =
          -SimTree->particle__Px[imu] * sin(NorthCMSzDeltaPhi) + SimTree->particle__Py[imu] * cos(NorthCMSzDeltaPhi);
      Pz_mu[imu] =
          SimTree->particle__Px[imu] * cos(NorthCMSzDeltaPhi) + SimTree->particle__Py[imu] * sin(NorthCMSzDeltaPhi);
      Py_mu[imu] = -SimTree->particle__Pz[imu];  //Corsika down going particles defined in -z direction!
      P_mu[imu] = sqrt(Px_mu[imu] * Px_mu[imu] + Py_mu[imu] * Py_mu[imu] + Pz_mu[imu] * Pz_mu[imu]);
 
      if (P_mu[imu] < MinP_CMS && AcptAllMu == false)
        continue;
      else if (SimTree->particle__ParticleID[imu] != 5 && SimTree->particle__ParticleID[imu] != 6)
        continue;
      else
        NmuPmin++;
 
      for (int jmu = 0; jmu < imu; ++jmu) {
        if (P_mu[jmu] < MinP_CMS && AcptAllMu == false)
          continue;
        if (SimTree->particle__ParticleID[imu] != 5 && SimTree->particle__ParticleID[imu] != 6)
          continue;
        MuMuDist = sqrt((SimTree->particle__x[imu] - SimTree->particle__x[jmu]) *
                            (SimTree->particle__x[imu] - SimTree->particle__x[jmu]) +
                        (SimTree->particle__y[imu] - SimTree->particle__y[jmu]) *
                            (SimTree->particle__y[imu] - SimTree->particle__y[jmu])) *
                   10.;  //CORSIKA [cm] to CMSCGEN [mm]
        if (MuMuDist < MinDist)
          MinDist = MuMuDist;
        if (MuMuDist < 2. * Target3dRadius)
          MuInMaxDist = true;
      }
    }
    if (MultiMuonNmin >= 2) {
      if (MuInMaxDist) {
        NcloseMultiMuonEvents++;
      } else {
        std::cout << "CosmicMuonGenerator.cc: Warning! No muon pair closer than " << 2. * Target3dRadius / 1000.
                  << "m   MinDist=" << MinDist / 1000. << "m at surface" << std::endl;
        std::cout << "Fraction of too wide opening angle multi muon events: "
                  << 1 - double(NcloseMultiMuonEvents) / SimTree_jentry << std::endl;
        std::cout << "NcloseMultiMuonEvents=" << NcloseMultiMuonEvents << std::endl;
        std::cout << "trying next event from file" << std::endl;
        NskippedMultiMuonEvents++;
        continue;  //EvtRejected while loop: get next event from file
      }
    }
 
    if (NmuPmin < MultiMuonNmin && AcptAllMu == false) {  //take single muon events consistently into account
      NskippedMultiMuonEvents++;
      continue;  //EvtRejected while loop: get next event from file
    }
 
    if (Debug)
      if (MultiMuonNmin >= 2)
        std::cout << "start trial do loop: MuMuDist=" << MinDist / 1000. << "[m]   Nmuons=" << nmuons
                  << "  NcloseMultiMuonEvents=" << NcloseMultiMuonEvents
                  << "  NskippedMultiMuonEvents=" << NskippedMultiMuonEvents << std::endl;
 
    //int primary_id = SimTree->run_ParticleID;
    Id_at = SimTree->shower_EventID;
 
    double M_at = 0.;
    //if (Id_at == 13) {
    Id_at = 2212;       //convert from Corsika to HepPDT
    M_at = 938.272e-3;  //[GeV] mass
    //}
 
    E_at = SimTree->shower_Energy;
    Theta_at = SimTree->shower_Theta;
    double phi_at = SimTree->shower_Phi - NorthCMSzDeltaPhi;  //rotate by almost 90 degrees
    if (phi_at < -Pi)
      phi_at += TwoPi;  //bring into interval (-Pi,Pi]
    else if (phi_at > Pi)
      phi_at -= TwoPi;
    double P_at = sqrt(E_at * E_at - M_at * M_at);
    //need to rotate about 90degrees around x->N axis => y<=>z,
    //then rotate new x-z-plane from x->North to x->LHC centre
    Px_at = P_at * sin(Theta_at) * sin(phi_at);
    Py_at = -P_at * cos(Theta_at);
    Pz_at = P_at * sin(Theta_at) * cos(phi_at);
 
    //compute maximal theta of secondary muons
    double theta_mu_max = Theta_at;
    double theta_mu_min = Theta_at;
 
    double phi_rel_min = 0.;  //phi_mu_min - phi_at
    double phi_rel_max = 0.;  //phi_mu_max - phi_at
 
    //std::cout << "SimTree->shower_Energy=" << SimTree->shower_Energy <<std::endl;
 
    Theta_mu.resize(nmuons);
    for (int imu = 0; imu < nmuons; ++imu) {
      Theta_mu[imu] = acos(-Py_mu[imu] / P_mu[imu]);
      if (Theta_mu[imu] > theta_mu_max)
        theta_mu_max = Theta_mu[imu];
      if (Theta_mu[imu] < theta_mu_min)
        theta_mu_min = Theta_mu[imu];
 
      double phi_mu = atan2(Px_mu[imu], Pz_mu[imu]);  // in (-Pi,Pi]
      double phi_rel = phi_mu - phi_at;
      if (phi_rel < -Pi)
        phi_rel += TwoPi;  //bring into interval (-Pi,Pi]
      else if (phi_rel > Pi)
        phi_rel -= TwoPi;
      if (phi_rel < phi_rel_min)
        phi_rel_min = phi_rel;
      else if (phi_rel > phi_rel_max)
        phi_rel_max = phi_rel;
    }
 
    double h_sf = SurfaceOfEarth + PlugWidth;  //[mm]
 
    double R_at = h_sf * tan(Theta_at);
 
    double JdRxzV_dR_trans = 1.;
    double JdPhiV_dPhi_trans = 1.;
    double JdR_trans_sqrt = 1.;
 
    //chose random vertex Phi and Rxz weighted to speed up and smoothen
    double R_mu_max = (h_sf + Target3dRadius) * tan(theta_mu_max);
    double R_max = std::min(SurfaceRadius, R_mu_max);
    double R_mu_min = (h_sf - Target3dRadius) * tan(theta_mu_min);
    double R_min = std::max(0., R_mu_min);
 
    if (R_at > SurfaceRadius) {
      std::cout << "CosmicMuonGenerator.cc: Warning! R_at=" << R_at << " > SurfaceRadius=" << SurfaceRadius
                << std::endl;
    }
 
    //do phase space transformation for horizontal radius R
 
    //determine first phase space limits
 
    double psR1min = R_min + 0.25 * (R_max - R_min);
    double psR1max = std::min(SurfaceRadius, R_max - 0.25 * (R_max - R_min));  //no R's beyond R_max
    double psR1 = psR1max - psR1min;
 
    double psR2min = R_min;
    double psR2max = R_max;
    double psR2 = psR2max - psR2min;
 
    double psR3min = 0.;
    double psR3max = SurfaceRadius;
    double psR3 = psR3max - psR3min;
 
    //double psall = psR1+psR2+psR3;
    double psRall = psR3;
 
    double fR1 = psR1 / psRall, fR2 = psR2 / psRall, fR3 = psR3 / psRall;  //f1+f2+f3=130%
    double pR1 = 0.25, pR2 = 0.7, pR3 = 0.05;
 
    //do phase space transformation for azimuthal angle phi
    double psPh1 = 0.5 * (phi_rel_max - phi_rel_min);
    double psPh2 = phi_rel_max - phi_rel_min;
    double psPh3 = TwoPi;
    double psPhall = psPh3;
 
    double fPh1 = psPh1 / psPhall, fPh2 = psPh2 / psPhall,
           fPh3 = psPh3 / psPhall;  //(f1+f2+f3=TwoPi+f1+f2)/(TwoPi+f1+f2)
 
    double pPh1 = 0.25, pPh2 = 0.7, pPh3 = 0.05;
 
    Trials = 0;          //global int trials
    double trials = 0.;  //local weighted trials
    Vx_mu.resize(nmuons);
    Vy_mu.resize(nmuons);
    Vz_mu.resize(nmuons);
    int NmuHitTarget = 0;
    while (NmuHitTarget < MultiMuonNmin) {
      NmuHitTarget = 0;  //re-initialize every loop iteration
      double Nver = 0.;
 
      //chose phase space class
      double RxzV;
      double which_R_class = RanGen->flat();
      if (which_R_class < pR1) {  //pR1% in psR1
        RxzV = psR1min + psR1 * RanGen->flat();
        JdRxzV_dR_trans = fR1 / pR1 * SurfaceRadius / psR1;
      } else if (which_R_class < pR1 + pR2) {  //further pR2% in psR2
        RxzV = psR2min + psR2 * RanGen->flat();
        JdRxzV_dR_trans = fR2 / pR2 * SurfaceRadius / psR2;
      } else {  //remaining pR3% in psR3=[0., R_max]
        RxzV = psR3min + psR3 * RanGen->flat();
        JdRxzV_dR_trans = fR3 / pR3 * SurfaceRadius / psR3;
      }
 
      JdR_trans_sqrt = 2. * RxzV / SurfaceRadius;  //flat in sqrt(r) space
 
      //chose phase space class
      double PhiV;
      double which_phi_class = RanGen->flat();
      if (which_phi_class < pPh1) {  //pPh1% in psPh1
        PhiV = phi_at + phi_rel_min + psPh1 * RanGen->flat();
        JdPhiV_dPhi_trans = fPh1 / pPh1 * TwoPi / psPh1;
      } else if (which_phi_class < pPh1 + pPh2) {  //further pPh2% in psPh2
        PhiV = phi_at + phi_rel_min + psPh2 * RanGen->flat();
        JdPhiV_dPhi_trans = fPh2 / pPh2 * TwoPi / psPh2;
      } else {  //remaining pPh3% in psPh3=[-Pi,Pi]
        PhiV = phi_at + phi_rel_min + psPh3 * RanGen->flat();
        JdPhiV_dPhi_trans = fPh3 / pPh3 * TwoPi / psPh3;
      }
 
      //shuffle PhiV into [-Pi,+Pi] interval
      if (PhiV < -Pi)
        PhiV += TwoPi;
      else if (PhiV > Pi)
        PhiV -= TwoPi;
 
      Nver++;
      trials += JdR_trans_sqrt * JdRxzV_dR_trans * JdPhiV_dPhi_trans;
      Trials++;
      if (trials > max_Trials)
        break;              //while (Id_sf.size() < 2) loop
      Ngen += (Nver - 1.);  //add number of generated vertices to initial cosmic events
 
      Vx_at = RxzV * sin(PhiV);  // [mm]
 
      Vy_at = h_sf;  // [mm] (SurfaceOfEarth + PlugWidth; Determine primary particle height below)
      //Vy_at = SimTree->shower_StartingAltitude*10. + h_sf; // [mm]
      //std::cout << "SimTree->shower_StartingAltitude*10=" << SimTree->shower_StartingAltitude*10 <<std::endl;
      Vz_at = RxzV * cos(PhiV);  // [mm]
 
      int NmuHitTargetSphere = 0;
      for (int imu = 0; imu < nmuons; ++imu) {
        Vx_mu[imu] = Vx_at + (-SimTree->particle__x[imu] * sin(NorthCMSzDeltaPhi) +
                              SimTree->particle__y[imu] * cos(NorthCMSzDeltaPhi)) *
                                 10;  //[mm] (Corsika cm to CMSCGEN mm)
        Vy_mu[imu] = h_sf;            //[mm] fixed at surface + PlugWidth
        Vz_mu[imu] = Vz_at + (SimTree->particle__x[imu] * cos(NorthCMSzDeltaPhi) +
                              SimTree->particle__y[imu] * sin(NorthCMSzDeltaPhi)) *
                                 10;  //[mm] (Corsika cm to CMSCGEN mm)
 
        //add atmospheric height to primary particle (default SimTree->shower_StartingAltitude = 0.)
        double pt_sec = sqrt(Px_mu[imu] * Px_mu[imu] + Pz_mu[imu] * Pz_mu[imu]);
        double theta_sec = atan2(std::fabs(Py_mu[imu]), pt_sec);
        double r_sec = sqrt((Vx_mu[imu] - Vx_at) * (Vx_mu[imu] - Vx_at) + (Vz_mu[imu] - Vz_at) * (Vz_mu[imu] - Vz_at));
        double h_prod = r_sec * tan(theta_sec);
        if (h_prod + h_sf > Vy_at)
          Vy_at = h_prod + h_sf;
 
        //only muons
        if (SimTree->particle__ParticleID[imu] != 5 && SimTree->particle__ParticleID[imu] != 6)
          continue;
 
        if (P_mu[imu] < MinP_CMS && AcptAllMu == false)
          continue;
 
        //check here if at least 2 muons make it to the target sphere
        double Vxz_mu = sqrt(Vx_mu[imu] * Vx_mu[imu] + Vz_mu[imu] * Vz_mu[imu]);
        theta_mu_max = atan((Vxz_mu + Target3dRadius) / (h_sf - Target3dRadius));
        theta_mu_min = atan((Vxz_mu - Target3dRadius) / (h_sf + Target3dRadius));
        if (Theta_mu[imu] > theta_mu_min && Theta_mu[imu] < theta_mu_max) {
          // check phi range (for a sphere with Target3dRadius around the target)
          double dPhi = Pi;
          if (Vxz_mu > Target3dRadius)
            dPhi = asin(Target3dRadius / Vxz_mu);
          double PhiPmu = atan2(Px_mu[imu], Pz_mu[imu]);  //muon phi
          double PhiVmu = atan2(Vx_mu[imu], Vz_mu[imu]);  //muon phi
          double rotPhi = PhiVmu + Pi;
          if (rotPhi > Pi)
            rotPhi -= TwoPi;
          double disPhi = std::fabs(rotPhi - PhiPmu);
          if (disPhi > Pi)
            disPhi = TwoPi - disPhi;
          if (disPhi < dPhi) {
            NmuHitTargetSphere++;
          }
        }
 
      }  //end imu for loop
 
      if (NmuHitTargetSphere < MultiMuonNmin)
        continue;  //while (Id_sf.size() < 2) loop
 
      //nmuons outgoing particle at SurFace
      Id_sf.clear();
      Px_sf.clear();
      Py_sf.clear();
      Pz_sf.clear();
      E_sf.clear();
      //M_sf_out.clear();
      Vx_sf.clear();
      Vy_sf.clear();
      Vz_sf.clear();
      T0_sf.clear();
 
      //nmuons particles at UnderGround
      Id_ug.clear();
      Px_ug.clear();
      Py_ug.clear();
      Pz_ug.clear();
      E_ug.clear();
      //M_ug.clear();
      Vx_ug.clear();
      Vy_ug.clear();
      Vz_ug.clear();
      T0_ug.clear();
 
      int Id_sf_this = 0;
      double Px_sf_this = 0., Py_sf_this = 0., Pz_sf_this = 0.;
      double E_sf_this = 0.;
      //double M_sf_this=0.;
      double Vx_sf_this = 0., Vy_sf_this = 0., Vz_sf_this = 0.;
      double T0_sf_this = 0.;
 
      T0_at = SimTree->shower_GH_t0 * SpeedOfLight;  // [mm]
 
      for (int imu = 0; imu < nmuons; ++imu) {
        if (P_mu[imu] < MinP_CMS && AcptAllMu == false)
          continue;
        //for the time being only muons
        if (SimTree->particle__ParticleID[imu] != 5 && SimTree->particle__ParticleID[imu] != 6)
          continue;
 
        Id_sf_this = SimTree->particle__ParticleID[imu];
        if (Id_sf_this == 5)
          Id_sf_this = -13;  //mu+
        else if (Id_sf_this == 6)
          Id_sf_this = 13;  //mu-
 
        else if (Id_sf_this == 1)
          Id_sf_this = 22;  //gamma
        else if (Id_sf_this == 2)
          Id_sf_this = -11;  //e+
        else if (Id_sf_this == 3)
          Id_sf_this = 11;  //e-
        else if (Id_sf_this == 7)
          Id_sf_this = 111;  //pi0
        else if (Id_sf_this == 8)
          Id_sf_this = 211;  //pi+
        else if (Id_sf_this == 9)
          Id_sf_this = -211;  //pi-
        else if (Id_sf_this == 10)
          Id_sf_this = 130;  //KL0
        else if (Id_sf_this == 11)
          Id_sf_this = 321;  //K+
        else if (Id_sf_this == 12)
          Id_sf_this = -321;  //K-
        else if (Id_sf_this == 13)
          Id_sf_this = 2112;  //n
        else if (Id_sf_this == 14)
          Id_sf_this = 2212;  //p
        else if (Id_sf_this == 15)
          Id_sf_this = -2212;  //pbar
        else if (Id_sf_this == 16)
          Id_sf_this = 310;  //Ks0
        else if (Id_sf_this == 17)
          Id_sf_this = 221;  //eta
        else if (Id_sf_this == 18)
          Id_sf_this = 3122;  //Lambda
 
        else {
          std::cout << "CosmicMuonGenerator.cc: Warning! Muon Id=" << Id_sf_this << " from file read in" << std::endl;
          Id_sf_this = 99999;  //trouble
        }
 
        T0_sf_this = SimTree->particle__Time[imu] * SpeedOfLight;  //in [mm]
 
        Px_sf_this = Px_mu[imu];
        Py_sf_this = Py_mu[imu];  //Corsika down going particles defined in -z direction!
        Pz_sf_this = Pz_mu[imu];
        E_sf_this = sqrt(P_mu[imu] * P_mu[imu] + MuonMass * MuonMass);
        Vx_sf_this = Vx_mu[imu];
        Vy_sf_this = Vy_mu[imu];  //[mm] fixed at surface + PlugWidth
        Vz_sf_this = Vz_mu[imu];
 
        OneMuoEvt.create(Id_sf_this,
                         Px_sf_this,
                         Py_sf_this,
                         Pz_sf_this,
                         E_sf_this,
                         MuonMass,
                         Vx_sf_this,
                         Vy_sf_this,
                         Vz_sf_this,
                         T0_sf_this);
        // if angles are ok, propagate to target
        if (goodOrientation()) {
          OneMuoEvt.propagate(ElossScaleFactor, RadiusOfTarget, ZDistOfTarget, ZCentrOfTarget, TrackerOnly, MTCCHalf);
        }
 
        if ((OneMuoEvt.hitTarget() && sqrt(OneMuoEvt.e() * OneMuoEvt.e() - MuonMass * MuonMass) > MinP_CMS) ||
            AcptAllMu == true) {
          Id_sf.push_back(Id_sf_this);
          Px_sf.push_back(Px_sf_this);
          Py_sf.push_back(Py_sf_this);
          Pz_sf.push_back(Pz_sf_this);
          E_sf.push_back(E_sf_this);
          //M_sf.push_back(M_sf_this);
          Vx_sf.push_back(Vx_sf_this);
          Vy_sf.push_back(Vy_sf_this);
          Vz_sf.push_back(Vz_sf_this);
          T0_sf.push_back(T0_sf_this);
          //T0_sf.push_back(0.); //synchronised arrival for 100% efficient full simulation tests
 
          Id_ug.push_back(OneMuoEvt.id());
          Px_ug.push_back(OneMuoEvt.px());
          Py_ug.push_back(OneMuoEvt.py());
          Pz_ug.push_back(OneMuoEvt.pz());
          E_ug.push_back(OneMuoEvt.e());
          //M_sf.push_back(OneMuoEvt.m());
          Vx_ug.push_back(OneMuoEvt.vx());
          Vy_ug.push_back(OneMuoEvt.vy());
          Vz_ug.push_back(OneMuoEvt.vz());
          T0_ug.push_back(OneMuoEvt.t0());
 
          NmuHitTarget++;
        }
      }
 
    }  // while (Id_sf.size() < 2); //end of do loop
 
    if (trials > max_Trials) {
      std::cout << "CosmicMuonGenerator.cc: Warning! trials reach max_trials=" << max_Trials
                << " without accepting event!" << std::endl;
      if (Debug) {
        std::cout << " N(mu)=" << Id_ug.size();
        if (!Id_ug.empty())
          std::cout << " E[0]=" << E_ug[0] << " theta="
                    << acos(-Py_ug[0] / sqrt(Px_ug[0] * Px_ug[0] + Py_ug[0] * Py_ug[0] + Pz_ug[0] * Pz_ug[0]))
                    << " R_xz=" << sqrt(Vx_sf[0] * Vx_sf[0] + Vy_sf[0] * Vy_sf[0]);
        std::cout << " Theta_at=" << Theta_at << std::endl;
      }
      std::cout << "Unweighted int num of Trials = " << Trials << std::endl;
      std::cout << "trying next event (" << SimTree_jentry << ") from file" << std::endl;
      NskippedMultiMuonEvents++;
      continue;  //EvtRejected while loop: get next event from file
    } else {
      if (NmuHitTarget < MultiMuonNmin) {
        std::cout << "CosmicMuonGenerator.cc: Warning! less than " << MultiMuonNmin << " muons hit target: N(mu=)"
                  << NmuHitTarget << std::endl;
        std::cout << "trying next event (" << SimTree_jentry << ") from file" << std::endl;
        NskippedMultiMuonEvents++;
        continue;  //EvtRejected while loop: get next event from file
      } else {     //if (MuInMaxDist) {
 
        //re-adjust T0's of surviving muons shifted to trigger time box
        //(possible T0 increase due to propagation (loss of energy/speed + travelled distance))
        double T0_ug_min, T0_ug_max;
        T0_ug_min = T0_ug_max = T0_ug[0];
        double Tbox = (MaxT0 - MinT0) * SpeedOfLight;  // [mm]
        double minDeltaT0 = 2 * Tbox;
        for (unsigned int imu = 0; imu < Id_ug.size(); ++imu) {
          double T0_this = T0_ug[imu];
          if (T0_this < T0_ug_min)
            T0_ug_min = T0_this;
          if (T0_this > T0_ug_max)
            T0_ug_max = T0_this;
          if (Debug)
            std::cout << "imu=" << imu << " T0_this=" << T0_this
                      << " P=" << sqrt(pow(Px_ug[imu], 2) + pow(Py_ug[imu], 2) + pow(Pz_ug[imu], 2)) << std::endl;
          for (unsigned int jmu = 0; jmu < imu; ++jmu) {
            if (std::fabs(T0_ug[imu] - T0_ug[jmu]) < minDeltaT0)
              minDeltaT0 = std::fabs(T0_ug[imu] - T0_ug[jmu]);
          }
        }
 
        if (int(Id_ug.size()) >= MultiMuonNmin && MultiMuonNmin >= 2 && minDeltaT0 > Tbox)
          continue;  //EvtRejected while loop: get next event from file
 
        double T0_min = T0_ug_min + MinT0 * SpeedOfLight;  //-12.5ns * c [mm]
        double T0_max = T0_ug_max + MaxT0 * SpeedOfLight;  //+12.5ns * c [mm]
 
        //ckeck if >= NmuMin in time box, else throw new random number + augment evt weight
        int TboxTrials = 0;
        int NmuInTbox;
        double T0_offset, T0diff;
        for (int tboxtrial = 0; tboxtrial < 1000; ++tboxtrial) {  //max 1000 trials
          T0_offset = RanGen->flat() * (T0_max - T0_min);         // [mm]
          TboxTrials++;
          T0diff = T0_offset - T0_max;  // [mm]
          NmuInTbox = 0;
          for (unsigned int imu = 0; imu < Id_ug.size(); ++imu) {
            if (T0_ug[imu] + T0diff > MinT0 * SpeedOfLight && T0_ug[imu] + T0diff < MaxT0 * SpeedOfLight)
              NmuInTbox++;
          }
          if (NmuInTbox >= MultiMuonNmin)
            break;
        }
        if (NmuInTbox < MultiMuonNmin)
          continue;  //EvtRejected while loop: get next event from file
 
        if (Debug)
          std::cout << "initial T0_at=" << T0_at << " T0_min=" << T0_min << " T0_max=" << T0_max
                    << " T0_offset=" << T0_offset;
        T0_at += T0diff;  //[mm]
        if (Debug)
          std::cout << " T0diff=" << T0diff << std::endl;
        for (unsigned int imu = 0; imu < Id_ug.size(); ++imu) {  //adjust @ surface + underground
          if (Debug)
            std::cout << "before: T0_sf[" << imu << "]=" << T0_sf[imu] << "  T0_ug=" << T0_ug[imu];
          T0_sf[imu] += T0diff;
          T0_ug[imu] += T0diff;
          if (Debug)
            std::cout << "   after: T0_sf[" << imu << "]=" << T0_sf[imu] << "  T0_ug=" << T0_ug[imu] << std::endl;
        }
        if (Debug)
          std::cout << "T0diff=" << T0diff << " T0_at=" << T0_at << std::endl;
 
        Nsel += 1;
        EventWeight = JdR_trans_sqrt * JdRxzV_dR_trans * JdPhiV_dPhi_trans / (trials * TboxTrials);
        EvtRejected = false;
        if (Debug)
          std::cout << "CosmicMuonGenerator.cc: Theta_at=" << Theta_at << " phi_at=" << phi_at << " Px_at=" << Px_at
                    << " Py_at=" << Py_at << " Pz_at=" << Pz_at << " T0_at=" << T0_at << " Vx_at=" << Vx_at
                    << " Vy_at=" << Vy_at << " Vz_at=" << Vz_at << " EventWeight=" << EventWeight
                    << " Nmuons=" << Id_sf.size() << std::endl;
      }
    }
 
  }  //while loop EvtRejected
 
  return true;  //write event to HepMC;
}
 
void CosmicMuonGenerator::terminate() {
  if (NumberOfEvents > 0) {
    std::cout << std::endl;
    std::cout << "*********************************************************" << std::endl;
    std::cout << "*********************************************************" << std::endl;
    std::cout << "***                                                   ***" << std::endl;
    std::cout << "***    C O S M I C   M U O N   S T A T I S T I C S    ***" << std::endl;
    std::cout << "***                                                   ***" << std::endl;
    std::cout << "*********************************************************" << std::endl;
    std::cout << "*********************************************************" << std::endl;
    std::cout << std::endl;
    std::cout << "       number of initial cosmic events:  " << int(Ngen) << std::endl;
    std::cout << "       number of actually diced events:  " << int(Ndiced) << std::endl;
    std::cout << "       number of generated and accepted events:  " << int(Nsel) << std::endl;
    double selEff = Nsel / Ngen;  // selection efficiency
    std::cout << "       event selection efficiency:  " << selEff * 100. << "%" << std::endl;
    int n100cos =
        Norm->events_n100cos(0., 0.);  //get final amount of cosmics in defined range for normalisation of flux
    std::cout << "       events with ~100 GeV and 1 - cos(theta) < 1/2pi: " << n100cos << std::endl;
    std::cout << std::endl;
    std::cout << "       momentum range: " << MinP << " ... " << MaxP << " GeV" << std::endl;
    std::cout << "       theta  range:   " << MinTheta * Rad2Deg << " ... " << MaxTheta * Rad2Deg << " deg"
              << std::endl;
    std::cout << "       phi    range:   " << MinPhi * Rad2Deg << " ... " << MaxPhi * Rad2Deg << " deg" << std::endl;
    std::cout << "       time   range:   " << MinT0 << " ... " << MaxT0 << " ns" << std::endl;
    std::cout << "       energy  loss:   " << ElossScaleFactor * 100. << "%" << std::endl;
    std::cout << std::endl;
    double area = 1.e-6 * Pi * SurfaceRadius * SurfaceRadius;  // area on surface [m^2]
    if (MinTheta > 90. * Deg2Rad)                              //upgoing muons from neutrinos)
      std::cout << "       area of initial cosmics at CMS detector bottom surface:   " << area << " m^2" << std::endl;
    else
      std::cout << "       area of initial cosmics on Surface + PlugWidth:   " << area << " m^2" << std::endl;
    std::cout << "       depth of CMS detector (from Surface):   " << SurfaceOfEarth / 1000 << " m" << std::endl;
 
    //at least 100 evts., and
    //downgoing inside theta parametersisation range
    //or upgoing neutrino muons
    if ((n100cos > 0 && MaxTheta < 84.26 * Deg2Rad) || MinTheta > 90. * Deg2Rad) {
      // rate: corrected for area and selection-Eff. and normalized to known flux, integration over solid angle (dOmega) is implicit
      // flux is normalised with respect to known flux of vertical 100GeV muons in area at suface level
      // rate seen by detector is lower than rate at surface area, so has to be corrected for selection-Eff.
      // normalisation factor has unit [1/s/m^2]
      // rate = N/time --> normalization factor gives 1/runtime/area
      // normalization with respect to number of actually diced events (Ndiced)
 
      if (MinTheta > 90. * Deg2Rad) {  //upgoing muons from neutrinos)
        double Omega = (cos(MinTheta) - cos(MaxTheta)) * (MaxPhi - MinPhi);
        //EventRate = (Ndiced * 3.e-13) * Omega * area*1.e4 * selEff;//area in cm, flux=3.e-13cm^-2s^-1sr^-1
        EventRate = (Ndiced * 3.e-13) * Omega * 4. * RadiusOfTarget * ZDistOfTarget * 1.e-2 *
                    selEff;                               //area in cm, flux=3.e-13cm^-2s^-1sr^-1
        rateErr_stat = EventRate / sqrt((double)Ndiced);  // stat. rate error
        rateErr_syst = EventRate / 3.e-13 * 1.0e-13;      // syst. rate error, from error of known flux
      } else {
        EventRate = (Ndiced * Norm->norm(n100cos)) * area * selEff;
        rateErr_stat = EventRate / sqrt((double)n100cos);  // stat. rate error
        rateErr_syst = EventRate / 2.63e-3 * 0.06e-3;      // syst. rate error, from error of known flux
      }
 
      // normalisation in region 1.-cos(theta) < 1./(2.*Pi), if MaxTheta even lower correct for this
      if (MaxTheta < 0.572) {
        double spacean = 2. * Pi * (1. - cos(MaxTheta));
        EventRate = (Ndiced * Norm->norm(n100cos)) * area * selEff * spacean;
        rateErr_stat = EventRate / sqrt((double)n100cos);  // rate error
        rateErr_syst = EventRate / 2.63e-3 * 0.06e-3;      // syst. rate error, from error of known flux
      }
 
    } else {
      EventRate = Nsel;  //no info as no muons at 100 GeV
      rateErr_stat = Nsel;
      rateErr_syst = Nsel;
      std::cout << std::endl;
      if (MinP > 100.)
        std::cout << " !!! MinP > 100 GeV. Cannot apply normalisation!" << std::endl;
      else if (MaxTheta > 84.26 * Deg2Rad)
        std::cout << " !!! Note: generated cosmics exceed parameterisation. No flux calculated!" << std::endl;
 
      else
        std::cout << " !!! Not enough statistics to apply normalisation (rate=1 +- 1) !!!" << std::endl;
    }
 
    std::cout << "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!" << std::endl;
    std::cout << "       rate is " << EventRate << " +-" << rateErr_stat << " (stat) "
              << "+-" << rateErr_syst << " (syst) "
              << " muons per second" << std::endl;
    if (EventRate != 0)
      std::cout << "       number of events corresponds to " << Nsel / EventRate << " s"
                << std::endl;  //runtime at CMS = Nsel/rate
    std::cout << "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!" << std::endl;
    std::cout << std::endl;
    std::cout << "*********************************************************" << std::endl;
    std::cout << "*********************************************************" << std::endl;
  }
}
 
void CosmicMuonGenerator::checkIn() {
  if (MinP < 0.) {
    NumberOfEvents = 0;
    std::cout << "  CMG-ERR: min.energy is out of range (0 GeV ... inf]" << std::endl << std::endl;
  }
  if (MaxP < 0.) {
    NumberOfEvents = 0;
    std::cout << "  CMG-ERR: max.energy is out of range (0 GeV ... inf]" << std::endl << std::endl;
  }
  if (MaxP <= MinP) {
    NumberOfEvents = 0;
    std::cout << "  CMG-ERR: max.energy is not greater than min.energy" << std::endl << std::endl;
  }
  if (MinTheta < 0.) {
    NumberOfEvents = 0;
    std::cout << "  CMG-ERR: min.theta is out of range [0 deg ... 90 deg)" << std::endl << std::endl;
  }
  if (MaxTheta < 0.) {
    NumberOfEvents = 0;
    std::cout << "  CMG-ERR: max.theta is out of range [0 deg ... 90 deg)" << std::endl << std::endl;
  }
  if (MaxTheta <= MinTheta) {
    NumberOfEvents = 0;
    std::cout << "  CMG-ERR: max.theta is not greater than min.theta" << std::endl << std::endl;
  }
  if (MinPhi < 0.) {
    NumberOfEvents = 0;
    std::cout << "  CMG-ERR: min.phi is out of range [0 deg ... 360 deg]" << std::endl << std::endl;
  }
  if (MaxPhi < 0.) {
    NumberOfEvents = 0;
    std::cout << "  CMG-ERR: max.phi is out of range [0 deg ... 360 deg]" << std::endl << std::endl;
  }
  if (MaxPhi <= MinPhi) {
    NumberOfEvents = 0;
    std::cout << "  CMG-ERR: max.phi is not greater than min.phi" << std::endl << std::endl;
  }
  if (MaxT0 <= MinT0) {
    NumberOfEvents = 0;
    std::cout << "  CMG-ERR: max.t0 is not greater than min.t0" << std::endl << std::endl;
  }
  if (ElossScaleFactor < 0.) {
    NumberOfEvents = 0;
    std::cout << "  CMG-ERR: E-loss scale factor is out of range [0 ... inf)" << std::endl << std::endl;
  }
  if (MinEnu < 0.) {
    NumberOfEvents = 0;
    std::cout << "  CMG-ERR: min.Enu is out of range [0 GeV ... inf]" << std::endl << std::endl;
  }
  if (MaxEnu < 0.) {
    NumberOfEvents = 0;
    std::cout << "  CMG-ERR: max.Enu is out of range [0 GeV ... inf]" << std::endl << std::endl;
  }
  if (MaxEnu <= MinEnu) {
    NumberOfEvents = 0;
    std::cout << "  CMG-ERR: max.Enu is not greater than min.Enu" << std::endl << std::endl;
  }
}
 
bool CosmicMuonGenerator::goodOrientation() {
  // check angular range (for a sphere with Target3dRadius around the target)
  bool goodAngles = false;
  bool phiaccepted = false;
  bool thetaaccepted = false;
  double RxzV = sqrt(OneMuoEvt.vx() * OneMuoEvt.vx() + OneMuoEvt.vz() * OneMuoEvt.vz());
 
  double rVY;
  if (MinTheta > 90. * Deg2Rad)  //upgoing muons from neutrinos
    rVY = -sqrt(RxzV * RxzV + RadiusCMS * RadiusCMS);
  else
    rVY = sqrt(RxzV * RxzV + (SurfaceOfEarth + PlugWidth) * (SurfaceOfEarth + PlugWidth));
 
  double Phi = OneMuoEvt.phi();
  double PhiV = atan2(OneMuoEvt.vx(), OneMuoEvt.vz()) + Pi;
  if (PhiV > TwoPi)
    PhiV -= TwoPi;
  double disPhi = std::fabs(PhiV - Phi);
  if (disPhi > Pi)
    disPhi = TwoPi - disPhi;
  double dPhi = Pi;
  if (RxzV > Target3dRadius)
    dPhi = asin(Target3dRadius / RxzV);
  if (disPhi < dPhi)
    phiaccepted = true;
  double Theta = OneMuoEvt.theta();
  double ThetaV = asin(RxzV / rVY);
  double dTheta = Pi;
  if (std::fabs(rVY) > Target3dRadius)
    dTheta = asin(Target3dRadius / std::fabs(rVY));
  //std::cout << "    dPhi = " <<   dPhi << "  (" <<   Phi << " <p|V> " <<   PhiV << ")" << std::endl;
  //std::cout << "  dTheta = " << dTheta << "  (" << Theta << " <p|V> " << ThetaV << ")" << std::endl;
 
  if (!phiaccepted && RxzV < Target3dRadius)
    //if (RxzV < Target3dRadius)
    std::cout << "Rejected phi=" << Phi << "  PhiV=" << PhiV << "  dPhi=" << dPhi << "  disPhi=" << disPhi
              << "  RxzV=" << RxzV << "  Target3dRadius=" << Target3dRadius << "  Theta=" << Theta << std::endl;
 
  if (std::fabs(Theta - ThetaV) < dTheta)
    thetaaccepted = true;
  if (phiaccepted && thetaaccepted)
    goodAngles = true;
  return goodAngles;
}
 
void CosmicMuonGenerator::initEvDis() {
#if ROOT_INTERACTIVE
  float rCMS = RadiusCMS / 1000.;
  float zCMS = Z_DistCMS / 1000.;
  if (TrackerOnly == true) {
    rCMS = RadiusTracker / 1000.;
    zCMS = Z_DistTracker / 1000.;
  }
  TH2F* disXY = new TH2F("disXY", "X-Y view", 160, -rCMS, rCMS, 160, -rCMS, rCMS);
  TH2F* disZY = new TH2F("disZY", "Z-Y view", 150, -zCMS, zCMS, 160, -rCMS, rCMS);
  gStyle->SetPalette(1, 0);
  gStyle->SetMarkerColor(1);
  gStyle->SetMarkerSize(1.5);
  TCanvas* disC = new TCanvas("disC", "Cosmic Muon Event Display", 0, 0, 800, 410);
  disC->Divide(2, 1);
  disC->cd(1);
  gPad->SetTicks(1, 1);
  disXY->SetMinimum(log10(MinP));
  disXY->SetMaximum(log10(MaxP));
  disXY->GetXaxis()->SetLabelSize(0.05);
  disXY->GetXaxis()->SetTitleSize(0.05);
  disXY->GetXaxis()->SetTitleOffset(1.0);
  disXY->GetXaxis()->SetTitle("X [m]");
  disXY->GetYaxis()->SetLabelSize(0.05);
  disXY->GetYaxis()->SetTitleSize(0.05);
  disXY->GetYaxis()->SetTitleOffset(0.8);
  disXY->GetYaxis()->SetTitle("Y [m]");
  disC->cd(2);
  gPad->SetGrid(1, 1);
  gPad->SetTicks(1, 1);
  disZY->SetMinimum(log10(MinP));
  disZY->SetMaximum(log10(MaxP));
  disZY->GetXaxis()->SetLabelSize(0.05);
  disZY->GetXaxis()->SetTitleSize(0.05);
  disZY->GetXaxis()->SetTitleOffset(1.0);
  disZY->GetXaxis()->SetTitle("Z [m]");
  disZY->GetYaxis()->SetLabelSize(0.05);
  disZY->GetYaxis()->SetTitleSize(0.05);
  disZY->GetYaxis()->SetTitleOffset(0.8);
  disZY->GetYaxis()->SetTitle("Y [m]");
#endif
}
 
void CosmicMuonGenerator::displayEv() {
#if ROOT_INTERACTIVE
  double RadiusDet = RadiusCMS;
  double Z_DistDet = Z_DistCMS;
  if (TrackerOnly == true) {
    RadiusDet = RadiusTracker;
    Z_DistDet = Z_DistTracker;
  }
  disXY->Reset();
  disZY->Reset();
  TMarker* InteractionPoint = new TMarker(0., 0., 2);
  TArc* r8m = new TArc(0., 0., (RadiusDet / 1000.));
  TLatex* logEaxis = new TLatex();
  logEaxis->SetTextSize(0.05);
  float energy = float(OneMuoEvt.e());
  float verX = float(OneMuoEvt.vx() / 1000.);  // [m]
  float verY = float(OneMuoEvt.vy() / 1000.);  // [m]
  float verZ = float(OneMuoEvt.vz() / 1000.);  // [m]
  float dirX = float(OneMuoEvt.px()) / std::fabs(OneMuoEvt.py());
  float dirY = float(OneMuoEvt.py()) / std::fabs(OneMuoEvt.py());
  float dirZ = float(OneMuoEvt.pz()) / std::fabs(OneMuoEvt.py());
  float yStep = disXY->GetYaxis()->GetBinWidth(1);
  int NbinY = disXY->GetYaxis()->GetNbins();
  for (int iy = 0; iy < NbinY; ++iy) {
    verX += dirX * yStep;
    verY += dirY * yStep;
    verZ += dirZ * yStep;
    float rXY = sqrt(verX * verX + verY * verY) * 1000.;  // [mm]
    float absZ = std::fabs(verZ) * 1000.;                 // [mm]
    if (rXY < RadiusDet && absZ < Z_DistDet) {
      disXY->Fill(verX, verY, log10(energy));
      disZY->Fill(verZ, verY, log10(energy));
      disC->cd(1);
      disXY->Draw("COLZ");
      InteractionPoint->Draw("SAME");
      r8m->Draw("SAME");
      logEaxis->DrawLatex((0.65 * RadiusDet / 1000.), (1.08 * RadiusDet / 1000.), "log_{10}E(#mu^{#pm})");
      disC->cd(2);
      disZY->Draw("COL");
      InteractionPoint->Draw("SAME");
      gPad->Update();
    }
  }
#endif
}
 
void CosmicMuonGenerator::setNumberOfEvents(unsigned int N) {
  if (NotInitialized)
    NumberOfEvents = N;
}
 
void CosmicMuonGenerator::setRanSeed(int N) {
  if (NotInitialized)
    RanSeed = N;
}
 
void CosmicMuonGenerator::setMinP(double P) {
  if (NotInitialized)
    MinP = P;
}
 
void CosmicMuonGenerator::setMinP_CMS(double P) {
  if (NotInitialized)
    MinP_CMS = P;
}
 
void CosmicMuonGenerator::setMaxP(double P) {
  if (NotInitialized)
    MaxP = P;
}
 
void CosmicMuonGenerator::setMinTheta(double Theta) {
  if (NotInitialized)
    MinTheta = Theta * Deg2Rad;
}
 
void CosmicMuonGenerator::setMaxTheta(double Theta) {
  if (NotInitialized)
    MaxTheta = Theta * Deg2Rad;
}
 
void CosmicMuonGenerator::setMinPhi(double Phi) {
  if (NotInitialized)
    MinPhi = Phi * Deg2Rad;
}
 
void CosmicMuonGenerator::setMaxPhi(double Phi) {
  if (NotInitialized)
    MaxPhi = Phi * Deg2Rad;
}
 
void CosmicMuonGenerator::setMinT0(double T0) {
  if (NotInitialized)
    MinT0 = T0;
}
 
void CosmicMuonGenerator::setMaxT0(double T0) {
  if (NotInitialized)
    MaxT0 = T0;
}
 
void CosmicMuonGenerator::setElossScaleFactor(double ElossScaleFact) {
  if (NotInitialized)
    ElossScaleFactor = ElossScaleFact;
}
 
void CosmicMuonGenerator::setRadiusOfTarget(double R) {
  if (NotInitialized)
    RadiusOfTarget = R;
}
 
void CosmicMuonGenerator::setZDistOfTarget(double Z) {
  if (NotInitialized)
    ZDistOfTarget = Z;
}
 
void CosmicMuonGenerator::setZCentrOfTarget(double Z) {
  if (NotInitialized)
    ZCentrOfTarget = Z;
}
 
void CosmicMuonGenerator::setTrackerOnly(bool Tracker) {
  if (NotInitialized)
    TrackerOnly = Tracker;
}
 
void CosmicMuonGenerator::setMultiMuon(bool MultiMu) {
  if (NotInitialized)
    MultiMuon = MultiMu;
}
void CosmicMuonGenerator::setMultiMuonFileName(std::string MultiMuFile) {
  if (NotInitialized)
    MultiMuonFileName = MultiMuFile;
}
void CosmicMuonGenerator::setMultiMuonFileFirstEvent(int MultiMuFile1stEvt) {
  if (NotInitialized)
    MultiMuonFileFirstEvent = MultiMuFile1stEvt;
}
void CosmicMuonGenerator::setMultiMuonNmin(int MultiMuNmin) {
  if (NotInitialized)
    MultiMuonNmin = MultiMuNmin;
}
 
void CosmicMuonGenerator::setTIFOnly_constant(bool TIF) {
  if (NotInitialized)
    TIFOnly_constant = TIF;
}
 
void CosmicMuonGenerator::setTIFOnly_linear(bool TIF) {
  if (NotInitialized)
    TIFOnly_linear = TIF;
}
void CosmicMuonGenerator::setMTCCHalf(bool MTCC) {
  if (NotInitialized)
    MTCCHalf = MTCC;
}
 
void CosmicMuonGenerator::setPlugVx(double PlugVtx) {
  if (NotInitialized)
    PlugVx = PlugVtx;
}
void CosmicMuonGenerator::setPlugVz(double PlugVtz) {
  if (NotInitialized)
    PlugVz = PlugVtz;
}
void CosmicMuonGenerator::setRhoAir(double VarRhoAir) {
  if (NotInitialized)
    RhoAir = VarRhoAir;
}
void CosmicMuonGenerator::setRhoWall(double VarRhoWall) {
  if (NotInitialized)
    RhoWall = VarRhoWall;
}
void CosmicMuonGenerator::setRhoRock(double VarRhoRock) {
  if (NotInitialized)
    RhoRock = VarRhoRock;
}
void CosmicMuonGenerator::setRhoClay(double VarRhoClay) {
  if (NotInitialized)
    RhoClay = VarRhoClay;
}
void CosmicMuonGenerator::setRhoPlug(double VarRhoPlug) {
  if (NotInitialized)
    RhoPlug = VarRhoPlug;
}
void CosmicMuonGenerator::setClayWidth(double ClayLayerWidth) {
  if (NotInitialized)
    ClayWidth = ClayLayerWidth;
}
 
void CosmicMuonGenerator::setMinEnu(double MinEn) {
  if (NotInitialized)
    MinEnu = MinEn;
}
void CosmicMuonGenerator::setMaxEnu(double MaxEn) {
  if (NotInitialized)
    MaxEnu = MaxEn;
}
void CosmicMuonGenerator::setNuProdAlt(double NuPrdAlt) {
  if (NotInitialized)
    NuProdAlt = NuPrdAlt;
}
 
double CosmicMuonGenerator::getRate() { return EventRate; }
 
void CosmicMuonGenerator::setAcptAllMu(bool AllMu) {
  if (NotInitialized)
    AcptAllMu = AllMu;
}