bool
convertEvtToTree(const string& evtFileName = "testEvents.evt",
const string& outFileName = "testEvents.root",
const long int maxNmbEvents = -1,
const string& outTreeName = "rootPwaEvtTree",
const string& prodKinPartNamesObjName = "prodKinParticles",
const string& prodKinMomentaLeafName = "prodKinMomenta",
const string& decayKinPartNamesObjName = "decayKinParticles",
const string& decayKinMomentaLeafName = "decayKinMomenta",
const bool debug = false)
{
// open input file
printInfo << "opening input file '" << evtFileName << "'" << endl;
ifstream evtFile(evtFileName.c_str());
if (not evtFile or not evtFile.good()) {
printWarn << "cannot open input file '" << evtFileName << "'" << endl;
return false;
}
// create output file
printInfo << "creating output file '" << outFileName << "'" << endl;
TFile* outFile = TFile::Open(outFileName.c_str(), "RECREATE");
if (not outFile) {
printErr << "cannot open output file '" << outFileName << "'" << endl;
return false;
}
// create tree
TTree* tree = new TTree(outTreeName.c_str(), outTreeName.c_str());
if (not tree) {
printErr << "problems creating tree '" << outTreeName << "' "
<< "in file '" << outFileName << "'" << endl;
return false;
}
// doit
TClonesArray* prodKinPartNames = new TClonesArray("TObjString");
TClonesArray* decayKinPartNames = new TClonesArray("TObjString");
const bool success = fillTreeFromEvt(evtFile, *tree,
*prodKinPartNames, *decayKinPartNames,
maxNmbEvents,
prodKinMomentaLeafName, decayKinMomentaLeafName,
debug);
tree->Write();
prodKinPartNames->Write (prodKinPartNamesObjName.c_str (), TObject::kSingleKey);
decayKinPartNames->Write(decayKinPartNamesObjName.c_str(), TObject::kSingleKey);
outFile->Close();
if (success)
printSucc << "wrote events to file '" << outFileName << "'" << endl;
else
printWarn << "problems processing events" << endl;
return success;
}
void
fillUdstDataIntoMassBins_example(const string& inFileNamePattern = "fillUdstDataIntoMassBins_example.root",
const string& dirName = "./test",
const long int maxNmbEvents = -1,
const unsigned int nmbMassBins = 50,
const double massBinWidth = 40, // [MeV/c^2]
const double massRangeMin = 500, // [MeV/c^2]
const string& uDstTreeName = "pwaDataTree",
const string& pwaTreeName = "rootPwaEvtTree",
const long int treeCacheSize = 25000000, // 25 MByte ROOT tree read cache
const bool debug = false)
{
const string prodKinPartNamesObjName = "prodKinParticles";
const string prodKinMomentaLeafName = "prodKinMomenta";
const string decayKinPartNamesObjName = "decayKinParticles";
const string decayKinMomentaLeafName = "decayKinMomenta";
TStopwatch timer;
timer.Start();
printInfo << "reading uDST file(s) '" << inFileNamePattern << "'" << endl
<< " writing " << nmbMassBins << " mass bins in mass interval "
<< "[" << massRangeMin << ", " << massRangeMin + nmbMassBins * massBinWidth << "] "
<< "MeV/c^2 to '" << dirName << "'" << endl
<< " reading uDST data from tree '" << uDstTreeName << "'" << endl
<< " writing PWA data to tree '" << pwaTreeName << "'" << endl;
// create chain and connect tree leaf variables to branches
TChain uDstChain(uDstTreeName.c_str());
if (uDstChain.Add(inFileNamePattern.c_str()) < 1)
printWarn << "no events in uDST input file(s) '" << inFileNamePattern << "'" << endl;
const long int nmbEventsUdstChain = uDstChain.GetEntries();
uDstChain.GetListOfFiles()->ls();
// !!! <channel-dependent part> !!!
// connect tree leafs
TLorentzVector* photons[4] = {0, 0, 0, 0};
TLorentzVector* piMinus = 0;
TLorentzVector* beam = 0;
TLorentzVector* recoil = 0;
uDstChain.SetBranchAddress("gamma1", &(photons[0]));
uDstChain.SetBranchAddress("gamma2", &(photons[1]));
uDstChain.SetBranchAddress("gamma3", &(photons[2]));
uDstChain.SetBranchAddress("gamma4", &(photons[3]));
uDstChain.SetBranchAddress("pi_out", &piMinus);
uDstChain.SetBranchAddress("pi_in", &beam);
uDstChain.SetBranchAddress("proton", &recoil);
uDstChain.SetCacheSize(treeCacheSize);
uDstChain.AddBranchToCache("gamma1", true);
uDstChain.AddBranchToCache("gamma2", true);
uDstChain.AddBranchToCache("gamma3", true);
uDstChain.AddBranchToCache("gamma4", true);
uDstChain.AddBranchToCache("pi_out", true);
uDstChain.AddBranchToCache("pi_in", true);
uDstChain.AddBranchToCache("proton", true);
uDstChain.StopCacheLearningPhase();
// !!! </channel-dependent part> !!!
// create directories and .root files
vector<TFile*> pwaDataFiles;
vector<TTree*> pwaDataTrees;
if (not createMassBinFiles(pwaDataFiles, pwaDataTrees, dirName, nmbMassBins, massBinWidth,
massRangeMin, pwaTreeName)) {
printErr << "there were problems creating the mass bin directories/files. aborting." << endl;
return;
}
printSucc << "created " << pwaDataFiles.size() << " directories/files" << endl;
// write arrays with production and decay particle names to root files
{
TClonesArray prodKinPartNames ("TObjString", 1);
TClonesArray decayKinPartNames("TObjString", 3);
// !!! <channel-dependent part> !!!
new (prodKinPartNames [0]) TObjString("pi-"); // beam particle
new (decayKinPartNames[0]) TObjString("pi0");
new (decayKinPartNames[1]) TObjString("pi0");
new (decayKinPartNames[2]) TObjString("pi-");
// !!! </channel-dependent part> !!!
for (unsigned int i = 0; i < pwaDataFiles.size(); ++i) {
pwaDataFiles[i]->cd();
prodKinPartNames.Write (prodKinPartNamesObjName.c_str (), TObject::kSingleKey);
decayKinPartNames.Write(decayKinPartNamesObjName.c_str(), TObject::kSingleKey);
}
printSucc << "wrote particle name arrays to all files. "
<< "beam = 'pi-', decay = {'pi0', 'pi0', 'pi-'}." << endl;
}
// create tree leafs
{
TClonesArray* prodKinMomenta = new TClonesArray("TVector3");
TClonesArray* decayKinMomenta = new TClonesArray("TVector3");
const int splitLevel = 99;
const int bufSize = 256000;
for (unsigned int i = 0; i < pwaDataTrees.size(); ++i) {
pwaDataTrees[i]->Branch(prodKinMomentaLeafName.c_str(), "TClonesArray", &prodKinMomenta,
bufSize, splitLevel);
pwaDataTrees[i]->Branch(decayKinMomentaLeafName.c_str(), "TClonesArray", &decayKinMomenta,
bufSize, splitLevel);
}
printSucc << "created branches for all trees" << endl;
}
// loop over events
const long int nmbEvents = ((maxNmbEvents > 0) ? maxNmbEvents : nmbEventsUdstChain);
printInfo << "writing events into mass bin files" << endl
<< " looping over " << nmbEvents << " tree entries" << endl;
unsigned long int countEvWritten = 0;
progress_display progressIndicator(nmbEvents, cout, "");
for (long int eventIndex = 0; eventIndex < nmbEvents; ++eventIndex) {
++progressIndicator;
if ((uDstChain.LoadTree(eventIndex) < 0) or (uDstChain.GetEntry(eventIndex) == 0)) {
printWarn << "error reading event " << eventIndex << " from tree. skipping." << endl;
continue;
}
// !!! <channel-dependent part> !!!
// now just make some minor calculations before
// construct two pi0s
const TLorentzVector piZeros[2] = {*(photons[0]) + *(photons[1]), *(photons[2]) + *(photons[3])};
// construct intermediate state X
const TLorentzVector X = piZeros[0] + piZeros[1] + *piMinus;
// calculate t'
const double t = (*beam - X) * (*beam - X);
const double tPrime = fabs(t) - fabs((X.M() * X.M() - beam->M() * beam->M())*(X.M() * X.M() - beam->M() * beam->M())
/ (4 * (beam->Vect() * beam->Vect())));
// cut on t'
if ((tPrime < 0.1) or (tPrime > 1.0))
continue;
// write out PWA data
const double fsEnergy = X.E() + recoil->E() - recoil->M(); // measured total energy of final state
const double scaleFactor = fsEnergy / beam->E();
const TLorentzVector beamScaled(beam->Vect() * scaleFactor, fsEnergy);
if (writeEvent(pwaDataTrees, beamScaled, piZeros[0], piZeros[1], *piMinus,
X.M(), nmbMassBins, massBinWidth, massRangeMin,
prodKinMomentaLeafName, decayKinMomentaLeafName, debug))
++countEvWritten;
// !!! </channel-dependent part> !!!
}
// write trees
long unsigned int countTreeEvents = 0;
for (unsigned int i = 0; i < nmbMassBins; ++i) {
pwaDataTrees[i]->GetCurrentFile()->Write();
long unsigned int nmbEvents = pwaDataTrees[i]->GetEntries();
printSucc << "written " << setw(10) << nmbEvents << " events to file " << "'"
<< pwaDataTrees[i]->GetCurrentFile()->GetName() << "'" << endl;
countTreeEvents += nmbEvents;
pwaDataTrees[i]->GetCurrentFile()->Close();
}
pwaDataFiles.clear();
pwaDataTrees.clear();
printInfo << "wrote " << min(countEvWritten, countTreeEvents)
<< " out of " << nmbEvents << " events" <<endl;
timer.Stop();
printInfo << "this job consumed: ";
timer.Print();
}
