Py8toJetInput Class Reference

#include <Py8toJetInput.h>

Inheritance diagram for Py8toJetInput:

Public Types
typedef Pythia8::Event	Event
typedef Pythia8::Particle	Particle

Public Member Functions
virtual const std::vector < fastjet::PseudoJet >	fillJetAlgoInput (const Event &, const Event &, const lhef::LHEEvent *lhee=nullptr, const std::vector< int > *partonList=nullptr)
	Py8toJetInput ()
void	setJetEtaMax (double max)
virtual	~Py8toJetInput ()

Protected Types
enum	partonTypes { ID_TOP = 6, ID_GLUON = 21, ID_PHOTON = 22 }

Protected Member Functions
int	getAncestor (int, const Event &, const Event &)

Protected Attributes
double	fJetEtaMax
std::vector< fastjet::PseudoJet >	fJetInput

Detailed Description

Definition at line 13 of file Py8toJetInput.h.

Member Typedef Documentation

typedef Pythia8::Event Py8toJetInput::Event

Definition at line 15 of file Py8toJetInput.h.

typedef Pythia8::Particle Py8toJetInput::Particle

Definition at line 16 of file Py8toJetInput.h.

Member Enumeration Documentation

enum Py8toJetInput::partonTypes

protected

Enumerator
ID_TOP
ID_GLUON
ID_PHOTON

Definition at line 31 of file Py8toJetInput.h.

{ ID_TOP = 6, ID_GLUON = 21, ID_PHOTON = 22 };

Constructor & Destructor Documentation

Py8toJetInput::Py8toJetInput ( )

inline

Definition at line 18 of file Py8toJetInput.h.

: fJetEtaMax(10.) {}

virtual Py8toJetInput::~Py8toJetInput ( )

inlinevirtual

Definition at line 19 of file Py8toJetInput.h.

{}

Member Function Documentation

const std::vector< fastjet::PseudoJet > Py8toJetInput::fillJetAlgoInput ( const Event &  event, const Event &  workEvent, const lhef::LHEEvent *  lhee = nullptr, const std::vector< int > *  partonList = nullptr  )

virtual

Reimplemented in Py8toJetInputHEPEVT.

Definition at line 7 of file Py8toJetInput.cc.

References dataset::end, PVValHelper::eta, spr::find(), fJetEtaMax, fJetInput, lhef::LHEEvent::getHEPEUP(), mps_fire::i, ID_PHOTON, ID_TOP, dqmiolumiharvest::j, lhef::HEPEUP::MOTHUP, edm::shift, and mps_update::status.

Referenced by JetMatchingHook::doVetoPartonLevel().

                                                                                                     {
  fJetInput.clear();

  Event workEventJet = workEvent;

  const lhef::HEPEUP& hepeup = *lhee->getHEPEUP();

  std::set<int> typeSet[3];

  // FIXME !!!
  // This is not safe to assume it's 3 because we're passing in a pointer
  // and we do NOT know what the actuial size is. I'll have to improve it.
  //
  for (size_t i = 0; i < 3; i++) {
    typeSet[i].clear();
    for (size_t j = 0; j < typeIdx[i].size(); j++) {
      // HEPEUP and Py8 event record are shifted by 3
      // (system particle + 2 beam particles in Py8 event)
      // ... EXCEPT FOR THE DECAY PRODUCTS IF DONE AT THE ME LEVEL !!!!!
      // ... in such case, the decay productes get gutted out of the sequence
      // and get placed in Py8 Event later on...
      // so we need to figure out the shift
      int pos = typeIdx[i][j];
      int shift = 3;
      // skip the first 2 entrirs in HEPEUP - they're incoming partons
      for (int ip = 2; ip < pos; ip++) {
        // alternative can be: moth1 != 1 && moth2 !=2...
        // but moth1 == moth2 means pointer to the same mother t
        // that can only be a resonance, unless moth1==moth2==0
        //
        if (hepeup.MOTHUP[ip].first == hepeup.MOTHUP[ip].second) {
          shift--;
        }
      }
      pos += shift;
      // typeSet[i].insert( event[pos].daughter1() );
      typeSet[i].insert(pos);
    }
  }

  // int iTypeEnd = (typeIdx[1].empty()) ? 1 : 2;

  // --> FIXME !!!
  int iType = 0;     // only LIGHT jets for now
  int jetAllow = 0;  // hardcoded for now for the same value as is set in Steve's example
                     // at present, not even in use...
                     // int jetMatch = 0; // hardcoded for now for the same value as is set in Steve's example

  // Loop over particles and decide what to pass to the jet algorithm
  for (int i = 0; i < workEventJet.size(); ++i) {
    if (!workEventJet[i].isFinal())
      continue;

    // jetAllow option to disallow certain particle types
    if (jetAllow == 1) {
      // Original AG+Py6 algorithm explicitly excludes tops,
      // leptons and photons.
      int id = workEventJet[i].idAbs();
      if ((id >= 11 && id <= 16) || id == ID_TOP || id == ID_PHOTON) {
        workEventJet[i].statusNeg();
        continue;
      }
    }

    // Get the index of this particle in original event
    int idx = workEventJet[i].daughter1();

    // Start with particle idx, and afterwards track mothers
    while (true) {
      // Light jets
      if (iType == 0) {
        // Do not include if originates from heavy jet or 'other'
        if (typeSet[1].find(idx) != typeSet[1].end() || typeSet[2].find(idx) != typeSet[2].end()) {
          workEventJet[i].statusNeg();
          break;
        }

        // Made it to start of event record so done
        if (idx == 0) {
          break;
        }
        // Otherwise next mother and continue
        idx = event[idx].mother1();

        // Heavy jets
      } else if (iType == 1) {
        // Only include if originates from heavy jet
        if (typeSet[1].find(idx) != typeSet[1].end())
          break;

        // Made it to start of event record with no heavy jet mother,
        // so DO NOT include particle
        if (idx == 0) {
          workEventJet[i].statusNeg();
          break;
        }

        // Otherwise next mother and continue
        idx = event[idx].mother1();

      }  // if (iType)
    }    // while (true)
  }      // for (i)

  // For jetMatch = 2, insert ghost particles corresponding to
  // each hard parton in the original process
  /*
  if (jetMatch > 0) 
  {

    for (int i = 0; i < int(typeIdx[iType].size()); i++) 
    {
      // Get y/phi of the parton
      Vec4   pIn = eventProcess[typeIdx[iType][i]].p();
      double y   = Vec4y(pIn);
      double phi = pIn.phi();

      // Create a ghost particle and add to the workEventJet
      double e   = MG5_GHOSTENERGY;
      double e2y = exp(2. * y);
      double pz  = e * (e2y - 1.) / (e2y + 1.);
      double pt  = sqrt(e*e - pz*pz);
      double px  = pt * cos(phi);
      double py  = pt * sin(phi);
      workEventJet.append(Particle(ID_GLUON, 99, 0, 0, 0, 0, 0, 0,
                                px, py, pz, e, 0., 0, 9.));

    } // for (i)
  } // if (jetMatch == 2)
*/

  for (int i = 0; i < workEventJet.size(); i++) {
    // fisrt, weed out all entries marked with statusNeg();
    //
    if (workEventJet[i].status() < 0)
      continue;

    // now weed out all entries above etaMax
    // in principle, we can use etaJetMaxAlgo because it's set equal to etaJetMax
    // as for etaJetMax, it gets set to memain_.etaclmax
    //
    if (fabs(workEventJet[i].eta()) > fJetEtaMax)
      continue;

    // need to double check if native FastJet understands Py8 Event format
    // in general, PseudoJet gets formed from (px,py,pz,E)
    //
    fastjet::PseudoJet partTmp = workEventJet[i];
    fJetInput.push_back(partTmp);
  }

  return fJetInput;
}

int Py8toJetInput::getAncestor ( int  pos, const Event &  fullEvent, const Event &  workEvent  )

protected

Definition at line 164 of file Py8toJetInput.cc.

References funct::abs(), counter, and mps_update::status.

Referenced by Py8toJetInputHEPEVT::fillJetAlgoInput().

                                                                                      {
  int parentId = fullEvent[pos].mother1();
  int parentPrevId = 0;
  int counter = pos;

  while (parentId > 0) {
    if (parentId == fullEvent[counter].mother2())  // carbon copy, keep walking up
    {
      parentPrevId = parentId;
      counter = parentId;
      parentId = fullEvent[parentPrevId].mother1();
      continue;
    }

    // we get here if not a carbon copy

    // let's check if it's a normal process, etc.
    //
    if ((parentId < parentPrevId) || parentId < fullEvent[counter].mother2())  // normal process
    {
      // first of all, check if hard block
      if (abs(fullEvent[counter].status()) == 22 || abs(fullEvent[counter].status()) == 23) {
        // yes, it's the hard block
        // we got what we want, and can exit now !
        parentId = counter;
        break;
      } else {
        parentPrevId = parentId;
        parentId = fullEvent[parentPrevId].mother1();
      }
    } else if (parentId > parentPrevId ||
               parentId > pos)  // "circular"/"forward-pointing parent" - intermediate process
    {
      parentId = -1;
      break;
    }

    // additional checks... although we shouldn't be geeting here all that much...
    //
    if (abs(fullEvent[parentId].status()) == 22 || abs(fullEvent[parentId].status()) == 23)  // hard block
    {
      break;
    }
    if (abs(fullEvent[parentId].status()) < 22)  // incoming
    {
      parentId = -1;
      break;
    }
  }

  return parentId;
}

void Py8toJetInput::setJetEtaMax ( double  max )

inline

Definition at line 25 of file Py8toJetInput.h.

References fJetEtaMax, and SiStripPI::max.

Referenced by JetMatchingHook::init().

                                {
    fJetEtaMax = max;
    return;
  }

Member Data Documentation

double Py8toJetInput::fJetEtaMax

protected

Definition at line 32 of file Py8toJetInput.h.

Referenced by fillJetAlgoInput(), and setJetEtaMax().

std::vector<fastjet::PseudoJet> Py8toJetInput::fJetInput

protected

Definition at line 36 of file Py8toJetInput.h.

Referenced by fillJetAlgoInput(), and Py8toJetInputHEPEVT::fillJetAlgoInput().