rho/tut_ana_comb.C

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class RhoCandList;
class RhoCandidate;
class PndAnaPidSelector;
class PndAnaPidCombiner;
class PndAnalysis;


void tut_ana_comb(int nevts = 0, TString prefix = "signal")
{
        // *** some variables
        int i=0,j=0, k=0, l=0;
        gStyle->SetOptFit(1011);
        
        // *** the output file for FairRunAna
        TString OutFile="out_dummy.root";  
                                        
        // *** the files coming from the simulation
        TString inPidFile  = prefix+"_pid.root";    // this file contains the PndPidCandidates and McTruth
        TString inParFile  = prefix+"_par.root";
        
        // *** PID table with selection thresholds; can be modified by the user
        TString pidParFile = TString(gSystem->Getenv("VMCWORKDIR"))+"/macro/params/all.par";    
        
        // *** initialization
        FairLogger::GetLogger()->SetLogToFile(kFALSE);
        FairRunAna* fRun = new FairRunAna();
        FairRuntimeDb* rtdb = fRun->GetRuntimeDb();
        fRun->SetSource(new FairFileSource(inPidFile));
        fRun->SetUseFairLinks(kTRUE);
        
        // *** setup parameter database         
        FairParRootFileIo* parIO = new FairParRootFileIo();
        parIO->open(inParFile);
        FairParAsciiFileIo* parIOPid = new FairParAsciiFileIo();
        parIOPid->open(pidParFile.Data(),"in");
        
        rtdb->setFirstInput(parIO);
        rtdb->setSecondInput(parIOPid);
        rtdb->setOutput(parIO);  
        
        fRun->SetOutputFile(OutFile);
        fRun->Init(); 
        
        // *** create an output file for all histograms
        TFile *out = TFile::Open(prefix+"_ana_comb.root","RECREATE");
        
        // *** create some histograms
        TH1F *hjpsim_all = new TH1F("hjpsim_all","J/#psi mass (all)",200,0,4.5);
        TH1F *hpsim_all  = new TH1F("hpsim_all","#psi(2S) mass (all)",200,0,5);
        
        TH1F *hjpsim_pcut = new TH1F("hjpsim_pcut","J/#psi mass (comb. by hand with p cut)",200,0,4.5);
        TH1F *hpsim_pcut  = new TH1F("hpsim_pcut","#psi(2S) mass (comb. by hand with p cut))",200,0,5);
        
        //
        // Now the analysis stuff comes...
        //
        
        
        // *** the data reader object
        PndAnalysis* theAnalysis = new PndAnalysis();
        if (nevts==0) nevts= theAnalysis->GetEntries();
        
        // *** RhoCandLists for the analysis
        RhoCandList muplus, muminus, piplus, piminus, jpsi, psi2s;
        
        // *** Mass selector for the jpsi cands
        RhoMassParticleSelector *jpsiMassSel=new RhoMassParticleSelector("jpsi",3.096,1.0);
        
        // ***
        // the event loop
        // ***
        while (theAnalysis->GetEvent() && i++<nevts)
        {
                if ((i%100)==0) cout<<"evt " << i << endl;
                                
                // *** Select with no PID info ('All'); type and mass are set           
                theAnalysis->FillList(muplus,  "MuonAllPlus");
                theAnalysis->FillList(muminus, "MuonAllMinus");
                theAnalysis->FillList(piplus,  "PionAllPlus");
                theAnalysis->FillList(piminus, "PionAllMinus");
                
                std::cout << "MuPlus:" << std::endl;
                for (int k = 0; k < muplus.GetLength(); k++){
                        std::cout << k << " : ";
                        ((FairMultiLinkedData_Interface*)muplus[k])->Print();
                        std::cout << std::endl;
                }

                std::cout << "MuMinus:" << std::endl;
                for (int k = 0; k < muminus.GetLength(); k++){
                        std::cout << k << " : ";
                        ((FairMultiLinkedData_Interface*)muminus[k])->Print();
                        std::cout << std::endl;
                }

                // ***
                // *** SIMPLE COMBINATORICS for J/psi -> mu+ mu-
                // ***
                jpsi.Combine(muplus, muminus);
                for (j=0;j<jpsi.GetLength();++j) hjpsim_all->Fill( jpsi[j]->M() );

                std::cout << "JPsi:" << std::endl;
                for (int k = 0; k < jpsi.GetLength(); k++){
                        std::cout << k << " : ";
                        ((FairMultiLinkedData_Interface*)jpsi[k])->Print();
                        std::cout << std::endl;
                }


                // *** some rough mass selection
                jpsi.Select(jpsiMassSel);
                
                // ***
                // *** SIMPLE COMBINATORICS for psi(2S) -> J/psi pi+ pi-
                // ***
                psi2s.Combine(jpsi, piplus, piminus);
                for (j=0;j<psi2s.GetLength();++j) hpsim_all->Fill( psi2s[j]->M() );
                
                // ***
                // *** COMBINATORICS BY HAND for J/psi -> mu+ mu- with extra p cut
                // ***
                
                // clean jpsi list and fill it with mu+ mu- combinations
                jpsi.Cleanup();
                
                for (j=0;j<muplus.GetLength();++j)
                {
                        if (muplus[j]->P()<0.3) continue;       // apply momentum selection (can be done easier
                                                                // with a momentum selector, just for demonstration here)
                        for (k=0;k<muminus.GetLength();++k)
                        {
                                if (muminus[k]->P()<0.3) continue;
                                
                                RhoCandidate *combCand = muplus[j]->Combine(muminus[k]);
                                jpsi.Append(combCand);
                        }
                }
                
                for (j=0;j<jpsi.GetLength();++j) hjpsim_pcut->Fill( jpsi[j]->M() );
                
                // *** some rough mass selection
                jpsi.Select(jpsiMassSel);
                
                // ***
                // *** COMBINATORICS BY HAND for psi(2S) -> J/psi pi+ pi- with extra p cut
                // ***
                
                // clean psi(2S) list and fill it with J/psi pi+ mpi- combinations
                psi2s.Cleanup();
                
                for (j=0;j<jpsi.GetLength();++j)
                {
                        for (k=0;k<piplus.GetLength();++k)
                        {
                                // momentum selection and check clash with J/psi
                                if ( piplus[k]->P()<0.2 || piplus[k]->Overlaps(jpsi[j]) ) continue;
                                
                                for (l=0;l<piminus.GetLength();++l)
                                {
                                        // momentum selection and check clash with J/psi
                                        if ( piminus[l]->P()<0.2 || piminus[l]->Overlaps(jpsi[j]) ) continue;
                                        
                                        RhoCandidate *combCand = jpsi[j]->Combine(piplus[k], piminus[l]);
                                        psi2s.Append(combCand);
                                }
                        }
                }
                
                for (j=0;j<psi2s.GetLength();++j) hpsim_pcut->Fill( psi2s[j]->M() );
                
                
                
        }
        
        // *** write out all the histos
        out->cd();
        
        hjpsim_all->Write();
        hpsim_all->Write();

        hjpsim_pcut->Write();
        hpsim_pcut->Write();

        out->Save();
        
}