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DSelector_pippimpmiss.C
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DSelector_pippimpmiss.C
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#include "DSelector_pippimpmiss.h"
void DSelector_pippimpmiss::Init(TTree *locTree)
{
// USERS: IN THIS FUNCTION, ONLY MODIFY SECTIONS WITH A "USER" OR "EXAMPLE" LABEL. LEAVE THE REST ALONE.
// The Init() function is called when the selector needs to initialize a new tree or chain.
// Typically here the branch addresses and branch pointers of the tree will be set.
// Init() will be called many times when running on PROOF (once per file to be processed).
//USERS: SET OUTPUT FILE NAME //can be overriden by user in PROOF
dOutputFileName = "pippimpmiss.root"; //"" for none
dOutputTreeFileName = ""; //"" for none
dFlatTreeFileName = ""; //output flat tree (one combo per tree entry), "" for none
dFlatTreeName = ""; //if blank, default name will be chosen
//dSaveDefaultFlatBranches = true; // False: don't save default branches, reduce disk footprint.
//dSaveTLorentzVectorsAsFundamentaFlatTree = false; // Default (or false): save particles as TLorentzVector objects. True: save as four doubles instead.
cout << "output file name = '" << dOutputFileName << "'" << endl
<< "accidental subtraction = " << dSidebandSubtractAcc << endl;
//Because this function gets called for each TTree in the TChain, we must be careful:
//We need to re-initialize the tree interface & branch wrappers, but don't want to recreate histograms
bool locInitializedPriorFlag = dInitializedFlag; //save whether have been initialized previously
DSelector::Init(locTree); //This must be called to initialize wrappers for each new TTree
//gDirectory now points to the output file with name dOutputFileName (if any)
if(locInitializedPriorFlag)
return; //have already created histograms, etc. below: exit
Get_ComboWrappers();
dPreviousRunNumber = 0;
/*********************************** EXAMPLE USER INITIALIZATION: ANALYSIS ACTIONS **********************************/
// EXAMPLE: Create deque for histogramming particle masses:
// // For histogramming the phi mass in phi -> K+ K-
// // Be sure to change this and dAnalyzeCutActions to match reaction
std::deque<Particle_t> MyPhi;
MyPhi.push_back(KPlus); MyPhi.push_back(KMinus);
//ANALYSIS ACTIONS: //Executed in order if added to dAnalysisActions
//false/true below: use measured/kinfit data
//PID
dAnalysisActions.push_back(new DHistogramAction_ParticleID(dComboWrapper, false));
//below: value: +/- N ns, Unknown: All PIDs, SYS_NULL: all timing systems
//dAnalysisActions.push_back(new DCutAction_PIDDeltaT(dComboWrapper, false, 0.5, KPlus, SYS_BCAL));
//PIDFOM (for charged tracks)
dAnalysisActions.push_back(new DHistogramAction_PIDFOM(dComboWrapper));
//dAnalysisActions.push_back(new DCutAction_PIDFOM(dComboWrapper, KPlus, 0.1));
//dAnalysisActions.push_back(new DCutAction_EachPIDFOM(dComboWrapper, 0.1));
//MASSES
dAnalysisActions.push_back(new DHistogramAction_InvariantMass(dComboWrapper, false, 0, {PiPlus, PiMinus}, 1000, 0, 2, "TwoPi"));
dAnalysisActions.push_back(new DHistogramAction_MissingMass (dComboWrapper, false, 5000, -0.5, 4.5));
dAnalysisActions.push_back(new DHistogramAction_MissingMassSquared(dComboWrapper, false, 5000, -0.5, 4.5));
dAnalysisActions.push_back(new DHistogramAction_MissingP4(dComboWrapper, false, ""));
//KINFIT RESULTS
dAnalysisActions.push_back(new DHistogramAction_KinFitResults(dComboWrapper));
//CUT MISSING MASS
//dAnalysisActions.push_back(new DCutAction_MissingMassSquared(dComboWrapper, false, -0.03, 0.02));
//CUT ON SHOWER QUALITY
//dAnalysisActions.push_back(new DCutAction_ShowerQuality(dComboWrapper, SYS_FCAL, 0.5));
//BEAM ENERGY
dAnalysisActions.push_back(new DHistogramAction_BeamEnergy(dComboWrapper, false));
//dAnalysisActions.push_back(new DCutAction_BeamEnergy(dComboWrapper, false, 8.2, 8.8)); // Coherent peak for runs in the range 30000-59999
//KINEMATICS
dAnalysisActions.push_back(new DHistogramAction_ParticleComboKinematics(dComboWrapper, false));
// ANALYZE CUT ACTIONS
// Change MyPhi to match reaction; code crashes if commented out
dAnalyzeCutActions = new DHistogramAction_AnalyzeCutActions(dAnalysisActions, dComboWrapper, false, 0, MyPhi, 1000, 0.9, 2.4, "CutActionEffect");
//INITIALIZE ACTIONS
//If you create any actions that you want to run manually (i.e. don't add to dAnalysisActions), be sure to initialize them here as well
Initialize_Actions();
dAnalyzeCutActions->Initialize(); // manual action, must call Initialize()
/******************************** EXAMPLE USER INITIALIZATION: STAND-ALONE HISTOGRAMS *******************************/
//EXAMPLE MANUAL HISTOGRAMS:
dHist_RFWeight = new TH1D("RFWeight", ";RF Weight", 1000, -2, 2);
dHist_MissingMass = new TH1D("MissingMass", ";Missing Mass (GeV/c^{2})", 5000, -0.5, 4.5);
dHist_MissingMassSideband = new TH1D("MissingMassSideband", ";Missing Mass (GeV/c^{2})", 5000, -0.5, 4.5);
dHist_MissingMassSquared = new TH1D("MissingMassSquared", ";Missing Mass Squared (GeV/c^{2})^{2}", 5000, -0.5, 4.5);
dHist_MissingMassSquaredSideband = new TH1D("MissingMassSquaredSideband", ";Missing Mass Squared (GeV/c^{2})^{2}", 5000, -0.5, 4.5);
dHist_BeamEnergy = new TH1D("BeamEnergy", ";Beam Energy (GeV)", 1000, 2, 12);
dHist_MissingParticle_MomVsTheta = new TH2D("MissingParticleMomVsTheta", ";Missing #theta (deg);Missing p (GeV/c)", 360, 0, 180, 400, 0, 9);
dHist_MissingParticle_PhiVsTheta = new TH2D("MissingParticlePhiVsTheta", ";Missing #theta (deg);Missing #phi (deg)", 360, 0, 180, 360, -180, 180);
/************************** EXAMPLE USER INITIALIZATION: CUSTOM OUTPUT BRANCHES - MAIN TREE *************************/
//EXAMPLE MAIN TREE CUSTOM BRANCHES (OUTPUT ROOT FILE NAME MUST FIRST BE GIVEN!!!! (ABOVE: TOP)):
//The type for the branch must be included in the brackets
//1st function argument is the name of the branch
//2nd function argument is the name of the branch that contains the size of the array (for fundamentals only)
/*
dTreeInterface->Create_Branch_Fundamental<Int_t>("my_int"); //fundamental = char, int, float, double, etc.
dTreeInterface->Create_Branch_FundamentalArray<Int_t>("my_int_array", "my_int");
dTreeInterface->Create_Branch_FundamentalArray<Float_t>("my_combo_array", "NumCombos");
dTreeInterface->Create_Branch_NoSplitTObject<TLorentzVector>("my_p4");
dTreeInterface->Create_Branch_ClonesArray<TLorentzVector>("my_p4_array");
*/
/************************** EXAMPLE USER INITIALIZATION: CUSTOM OUTPUT BRANCHES - FLAT TREE *************************/
// RECOMMENDED: CREATE ACCIDENTAL WEIGHT BRANCH
// dFlatTreeInterface->Create_Branch_Fundamental<Double_t>("accidweight");
//EXAMPLE FLAT TREE CUSTOM BRANCHES (OUTPUT ROOT FILE NAME MUST FIRST BE GIVEN!!!! (ABOVE: TOP)):
//The type for the branch must be included in the brackets
//1st function argument is the name of the branch
//2nd function argument is the name of the branch that contains the size of the array (for fundamentals only)
/*
dFlatTreeInterface->Create_Branch_Fundamental<Int_t>("flat_my_int"); //fundamental = char, int, float, double, etc.
dFlatTreeInterface->Create_Branch_FundamentalArray<Int_t>("flat_my_int_array", "flat_my_int");
dFlatTreeInterface->Create_Branch_NoSplitTObject<TLorentzVector>("flat_my_p4");
dFlatTreeInterface->Create_Branch_ClonesArray<TLorentzVector>("flat_my_p4_array");
*/
/************************************* ADVANCED EXAMPLE: CHOOSE BRANCHES TO READ ************************************/
//TO SAVE PROCESSING TIME
//If you know you don't need all of the branches/data, but just a subset of it, you can speed things up
//By default, for each event, the data is retrieved for all branches
//If you know you only need data for some branches, you can skip grabbing data from the branches you don't need
//Do this by doing something similar to the commented code below
//dTreeInterface->Clear_GetEntryBranches(); //now get none
//dTreeInterface->Register_GetEntryBranch("Proton__P4"); //manually set the branches you want
/************************************** DETERMINE IF ANALYZING SIMULATED DATA *************************************/
dIsMC = (dTreeInterface->Get_Branch("MCWeight") != NULL);
}
Bool_t DSelector_pippimpmiss::Process(Long64_t locEntry)
{
// The Process() function is called for each entry in the tree. The entry argument
// specifies which entry in the currently loaded tree is to be processed.
//
// This function should contain the "body" of the analysis. It can contain
// simple or elaborate selection criteria, run algorithms on the data
// of the event and typically fill histograms.
//
// The processing can be stopped by calling Abort().
// Use fStatus to set the return value of TTree::Process().
// The return value is currently not used.
if (locEntry % 100000 == 0)
cout << "Event: " << locEntry << endl;
//CALL THIS FIRST
DSelector::Process(locEntry); //Gets the data from the tree for the entry
//cout << "RUN " << Get_RunNumber() << ", EVENT " << Get_EventNumber() << endl;
//TLorentzVector locProductionX4 = Get_X4_Production();
/******************************************** GET POLARIZATION ORIENTATION ******************************************/
//Only if the run number changes
//RCDB environment must be setup in order for this to work! (Will return false otherwise)
UInt_t locRunNumber = Get_RunNumber();
if(locRunNumber != dPreviousRunNumber)
{
dIsPolarizedFlag = dAnalysisUtilities.Get_IsPolarizedBeam(locRunNumber, dIsPARAFlag);
dPreviousRunNumber = locRunNumber;
}
/********************************************* SETUP UNIQUENESS TRACKING ********************************************/
//ANALYSIS ACTIONS: Reset uniqueness tracking for each action
//For any actions that you are executing manually, be sure to call Reset_NewEvent() on them here
Reset_Actions_NewEvent();
dAnalyzeCutActions->Reset_NewEvent(); // manual action, must call Reset_NewEvent()
//PREVENT-DOUBLE COUNTING WHEN HISTOGRAMMING
//Sometimes, some content is the exact same between one combo and the next
//e.g. maybe two combos have different beam particles, but the same data for the final-state
//When histogramming, you don't want to double-count when this happens: artificially inflates your signal (or background)
//So, for each quantity you histogram, keep track of what particles you used (for a given combo)
//Then for each combo, just compare to what you used before, and make sure it's unique
//EXAMPLE 1: Particle-specific info:
set<Int_t> locUsedSoFar_BeamEnergy; //Int_t: Unique ID for beam particles. set: easy to use, fast to search
//EXAMPLE 2: Combo-specific info:
//In general: Could have multiple particles with the same PID: Use a set of Int_t's
//In general: Multiple PIDs, so multiple sets: Contain within a map
//Multiple combos: Contain maps within a set (easier, faster to search)
set<map<Particle_t, set<Int_t> > > locUsedSoFar_MissingMass;
//INSERT USER ANALYSIS UNIQUENESS TRACKING HERE
/**************************************** EXAMPLE: FILL CUSTOM OUTPUT BRANCHES **************************************/
/*
Int_t locMyInt = 7;
dTreeInterface->Fill_Fundamental<Int_t>("my_int", locMyInt);
TLorentzVector locMyP4(4.0, 3.0, 2.0, 1.0);
dTreeInterface->Fill_TObject<TLorentzVector>("my_p4", locMyP4);
for(int loc_i = 0; loc_i < locMyInt; ++loc_i)
dTreeInterface->Fill_Fundamental<Int_t>("my_int_array", 3*loc_i, loc_i); //2nd argument = value, 3rd = array index
*/
/************************************************* LOOP OVER COMBOS *************************************************/
//Loop over combos
for(UInt_t loc_i = 0; loc_i < Get_NumCombos(); ++loc_i)
{
//Set branch array indices for combo and all combo particles
dComboWrapper->Set_ComboIndex(loc_i);
// Is used to indicate when combos have been cut
if(dComboWrapper->Get_IsComboCut()) // Is false when tree originally created
continue; // Combo has been cut previously
/********************************************** GET PARTICLE INDICES *********************************************/
//Used for tracking uniqueness when filling histograms, and for determining unused particles
//Step 0
Int_t locBeamID = dComboBeamWrapper->Get_BeamID();
Int_t locPiPlusTrackID = dPiPlusWrapper->Get_TrackID();
Int_t locPiMinusTrackID = dPiMinusWrapper->Get_TrackID();
/*********************************************** GET FOUR-MOMENTUM **********************************************/
// Get P4's: //is kinfit if kinfit performed, else is measured
//dTargetP4 is target p4
//Step 0
TLorentzVector locBeamP4 = dComboBeamWrapper->Get_P4();
TLorentzVector locPiPlusP4 = dPiPlusWrapper->Get_P4();
TLorentzVector locPiMinusP4 = dPiMinusWrapper->Get_P4();
TLorentzVector locMissingProtonP4 = dMissingProtonWrapper->Get_P4();
// Get Measured P4's:
//Step 0
TLorentzVector locBeamP4_Measured = dComboBeamWrapper->Get_P4_Measured();
TLorentzVector locPiPlusP4_Measured = dPiPlusWrapper->Get_P4_Measured();
TLorentzVector locPiMinusP4_Measured = dPiMinusWrapper->Get_P4_Measured();
/********************************************* GET COMBO RF TIMING INFO *****************************************/
TLorentzVector locBeamX4_Measured = dComboBeamWrapper->Get_X4_Measured();
// Double_t locBunchPeriod = dAnalysisUtilities.Get_BeamBunchPeriod(Get_RunNumber());
// Double_t locDeltaT_RF = dAnalysisUtilities.Get_DeltaT_RF(Get_RunNumber(), locBeamX4_Measured, dComboWrapper);
Int_t locRelBeamBucket = dAnalysisUtilities.Get_RelativeBeamBucket(Get_RunNumber(), locBeamX4_Measured, dComboWrapper); // 0 for in-time events, non-zero integer for out-of-time photons
Int_t locNumOutOfTimeBunchesInTree = 1; // YOU need to specify this number
// Number of out-of-time beam bunches in tree (on a single side, so that total number out-of-time bunches accepted is 2 times this number for left + right bunches)
Bool_t locSkipNearestOutOfTimeBunch = false; // True: skip events from nearest out-of-time bunch on either side (recommended).
if (locSkipNearestOutOfTimeBunch and abs(locRelBeamBucket) == 1) { // Skip nearest out-of-time bunch: tails of in-time distribution also leak in
dComboWrapper->Set_IsComboCut(true);
continue;
}
Int_t locNumOutOfTimeBunchesToUse = (locSkipNearestOutOfTimeBunch) ? locNumOutOfTimeBunchesInTree - 1 : locNumOutOfTimeBunchesInTree;
Double_t locAccidentalScalingFactor = dAnalysisUtilities.Get_AccidentalScalingFactor(Get_RunNumber(), locBeamP4.E(), dIsMC); // Ideal value would be 1, but deviations require added factor, which is different for data and MC.
// Double_t locAccidentalScalingFactorError = dAnalysisUtilities.Get_AccidentalScalingFactorError(Get_RunNumber(), locBeamP4.E()); // Ideal value would be 1, but deviations observed, need added factor.
Double_t locHistAccidWeightFactor = (dSidebandSubtractAcc) ? ((locRelBeamBucket == 0) ? 1 : -locAccidentalScalingFactor / (2 * locNumOutOfTimeBunchesToUse)) : 1; // Weight by 1 for in-time events, ScalingFactor*(1/NBunches) for out-of-time
/********************************************* COMBINE FOUR-MOMENTUM ********************************************/
// DO YOUR STUFF HERE
// Combine 4-vectors
TLorentzVector locMissingP4_Measured = locBeamP4_Measured + dTargetP4;
locMissingP4_Measured -= locPiPlusP4_Measured + locPiMinusP4_Measured;
/******************************************** EXECUTE ANALYSIS ACTIONS *******************************************/
// Loop through the analysis actions, executing them in order for the active particle combo
dAnalyzeCutActions->Perform_Action(); // Must be executed before Execute_Actions()
if(!Execute_Actions()) //if the active combo fails a cut, IsComboCutFlag automatically set
continue;
//if you manually execute any actions, and it fails a cut, be sure to call:
//dComboWrapper->Set_IsComboCut(true);
/**************************************** EXAMPLE: FILL CUSTOM OUTPUT BRANCHES **************************************/
/*
TLorentzVector locMyComboP4(8.0, 7.0, 6.0, 5.0);
//for arrays below: 2nd argument is value, 3rd is array index
//NOTE: By filling here, AFTER the cuts above, some indices won't be updated (and will be whatever they were from the last event)
//So, when you draw the branch, be sure to cut on "IsComboCut" to avoid these.
dTreeInterface->Fill_Fundamental<Float_t>("my_combo_array", -2*loc_i, loc_i);
dTreeInterface->Fill_TObject<TLorentzVector>("my_p4_array", locMyComboP4, loc_i);
*/
/**************************************** EXAMPLE: HISTOGRAM BEAM ENERGY *****************************************/
//Histogram beam energy (if haven't already)
if(locUsedSoFar_BeamEnergy.find(locBeamID) == locUsedSoFar_BeamEnergy.end())
{
// dHist_BeamEnergy->Fill(locBeamP4.E()); // Fills in-time and out-of-time beam photon combos
dHist_BeamEnergy->Fill(locBeamP4.E(), locHistAccidWeightFactor); // Alternate version with accidental subtraction
locUsedSoFar_BeamEnergy.insert(locBeamID);
}
/************************************ EXAMPLE: HISTOGRAM MISSING MASS SQUARED ************************************/
//Missing Mass Squared
double locMissingMassSquared = locMissingP4_Measured.M2();
//Uniqueness tracking: Build the map of particles used for the missing mass
//For beam: Don't want to group with final-state photons. Instead use "Unknown" PID (not ideal, but it's easy).
map<Particle_t, set<Int_t> > locUsedThisCombo_MissingMass;
locUsedThisCombo_MissingMass[Unknown].insert(locBeamID); //beam
locUsedThisCombo_MissingMass[PiPlus].insert(locPiPlusTrackID);
locUsedThisCombo_MissingMass[PiMinus].insert(locPiMinusTrackID);
//compare to what's been used so far
if(locUsedSoFar_MissingMass.find(locUsedThisCombo_MissingMass) == locUsedSoFar_MissingMass.end())
{
//unique missing mass combo: histogram it, and register this combo of particles
dHist_RFWeight->Fill(locHistAccidWeightFactor);
// dHist_MissingMass->Fill(sqrt(locMissingMassSquared)); // Fills in-time and out-of-time beam photon combos
dHist_MissingMass->Fill (sqrt(locMissingMassSquared), locHistAccidWeightFactor); // Alternate version with accidental subtraction
dHist_MissingMassSideband->Fill(sqrt(locMissingMassSquared), 1 - locHistAccidWeightFactor); // fill subtracted RF sidebands
// dHist_MissingMassSquared->Fill(locMissingMassSquared); // Fills in-time and out-of-time beam photon combos
dHist_MissingMassSquared->Fill (locMissingMassSquared, locHistAccidWeightFactor); // Alternate version with accidental subtraction
dHist_MissingMassSquaredSideband->Fill(locMissingMassSquared, 1 - locHistAccidWeightFactor); // fill subtracted RF sidebands
const TVector3 locMissingProtonMom = locMissingProtonP4.Vect();
dHist_MissingParticle_MomVsTheta->Fill(locMissingProtonMom.Theta() * TMath::RadToDeg(), locMissingProtonMom.Mag(), locHistAccidWeightFactor);
dHist_MissingParticle_PhiVsTheta->Fill(locMissingProtonMom.Theta() * TMath::RadToDeg(), locMissingProtonMom.Phi() * TMath::RadToDeg(), locHistAccidWeightFactor);
locUsedSoFar_MissingMass.insert(locUsedThisCombo_MissingMass);
}
//E.g. Cut
//if((locMissingMassSquared < -0.04) || (locMissingMassSquared > 0.04))
//{
// dComboWrapper->Set_IsComboCut(true);
// continue;
//}
/****************************************** FILL FLAT TREE (IF DESIRED) ******************************************/
// RECOMMENDED: FILL ACCIDENTAL WEIGHT
// dFlatTreeInterface->Fill_Fundamental<Double_t>("accidweight",locHistAccidWeightFactor);
/*
//FILL ANY CUSTOM BRANCHES FIRST!!
Int_t locMyInt_Flat = 7;
dFlatTreeInterface->Fill_Fundamental<Int_t>("flat_my_int", locMyInt_Flat);
TLorentzVector locMyP4_Flat(4.0, 3.0, 2.0, 1.0);
dFlatTreeInterface->Fill_TObject<TLorentzVector>("flat_my_p4", locMyP4_Flat);
for(int loc_j = 0; loc_j < locMyInt_Flat; ++loc_j)
{
dFlatTreeInterface->Fill_Fundamental<Int_t>("flat_my_int_array", 3*loc_j, loc_j); //2nd argument = value, 3rd = array index
TLorentzVector locMyComboP4_Flat(8.0, 7.0, 6.0, 5.0);
dFlatTreeInterface->Fill_TObject<TLorentzVector>("flat_my_p4_array", locMyComboP4_Flat, loc_j);
}
*/
//FILL FLAT TREE
//Fill_FlatTree(); //for the active combo
} // end of combo loop
//FILL HISTOGRAMS: Num combos / events surviving actions
Fill_NumCombosSurvivedHists();
/******************************************* LOOP OVER THROWN DATA (OPTIONAL) ***************************************/
/*
//Thrown beam: just use directly
if(dThrownBeam != NULL)
double locEnergy = dThrownBeam->Get_P4().E();
//Loop over throwns
for(UInt_t loc_i = 0; loc_i < Get_NumThrown(); ++loc_i)
{
//Set branch array indices corresponding to this particle
dThrownWrapper->Set_ArrayIndex(loc_i);
//Do stuff with the wrapper here ...
}
*/
/****************************************** LOOP OVER OTHER ARRAYS (OPTIONAL) ***************************************/
/*
//Loop over beam particles (note, only those appearing in combos are present)
for(UInt_t loc_i = 0; loc_i < Get_NumBeam(); ++loc_i)
{
//Set branch array indices corresponding to this particle
dBeamWrapper->Set_ArrayIndex(loc_i);
//Do stuff with the wrapper here ...
}
//Loop over charged track hypotheses
for(UInt_t loc_i = 0; loc_i < Get_NumChargedHypos(); ++loc_i)
{
//Set branch array indices corresponding to this particle
dChargedHypoWrapper->Set_ArrayIndex(loc_i);
//Do stuff with the wrapper here ...
}
//Loop over neutral particle hypotheses
for(UInt_t loc_i = 0; loc_i < Get_NumNeutralHypos(); ++loc_i)
{
//Set branch array indices corresponding to this particle
dNeutralHypoWrapper->Set_ArrayIndex(loc_i);
//Do stuff with the wrapper here ...
}
*/
/************************************ EXAMPLE: FILL CLONE OF TTREE HERE WITH CUTS APPLIED ************************************/
/*
Bool_t locIsEventCut = true;
for(UInt_t loc_i = 0; loc_i < Get_NumCombos(); ++loc_i) {
//Set branch array indices for combo and all combo particles
dComboWrapper->Set_ComboIndex(loc_i);
// Is used to indicate when combos have been cut
if(dComboWrapper->Get_IsComboCut())
continue;
locIsEventCut = false; // At least one combo succeeded
break;
}
if(!locIsEventCut && dOutputTreeFileName != "")
Fill_OutputTree();
*/
return kTRUE;
}
void DSelector_pippimpmiss::Finalize(void)
{
//Save anything to output here that you do not want to be in the default DSelector output ROOT file.
//Otherwise, don't do anything else (especially if you are using PROOF).
//If you are using PROOF, this function is called on each thread,
//so anything you do will not have the combined information from the various threads.
//Besides, it is best-practice to do post-processing (e.g. fitting) separately, in case there is a problem.
//DO YOUR STUFF HERE
//CALL THIS LAST
DSelector::Finalize(); //Saves results to the output file
}