tut_ana_d0_qahelper.C

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class FairRunAna;

// Check if file exists and readable
bool checkfile(TString fn)
{
        bool fileok=true;
        TFile fff(fn, "READ");
        if (fff.IsZombie()) fileok=false;
        TTree *t=(TTree*)fff.Get("pndsim");
        if (t==0x0) fileok=false;

        if (!fileok) cout <<"Skipping broken file '"<<fn<<"'"<<endl;
        fff.Close();

        return fileok;
}

// Add many input files to FairRunAna
void attachFiles(FairRunAna* fRun, TString pref, int min, int max)
{
        bool firstfile=true;
        for (int i=min;i<=max;++i) {
                TString fname = TString::Format("%s_%d_pid.root",pref.Data(),i);

                if (checkfile(fname) ) {
                        if (firstfile) fRun->SetInputFile(fname);
                        else fRun->AddFile(fname);
                        firstfile=false;
                }
        }
}

void tut_ana_d0_qahelper(TString pref="pid_complete.root", int min=-1, int max=1, int nevts=0)
{
        TString OutFile, inParFile;

        double pbarmom = 9.808065;
        double mp=0.938272;
        TLorentzVector ini(0,0,pbarmom, sqrt(pbarmom*pbarmom+mp*mp)+mp);

        // *** add input files
        FairRunAna *fRun= new FairRunAna();

        // *** just open one file
        if (min<0)
        {
                // *** set input file, output file and par file
                OutFile   = "ana.root";
                inParFile = "simparams.root";

                fRun->SetInputFile(pref);
        }
        // *** attach many input files
        else {
                // *** set output file and par file
                OutFile   = TString::Format("%s_ana_%d_%d.root",pref.Data(), min, max);
                inParFile =     TString::Format("%s_%d_par.root",pref.Data(), min);

                attachFiles(fRun, pref, min, max);
        }

        // *** 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);
        FairRuntimeDb* rtdb = fRun->GetRuntimeDb();

        // *** 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("dummyout.root");
        fRun->Init();

        // *** create an output file for all histograms
        TFile *out = TFile::Open(OutFile,"RECREATE");

        // *** the data reader object
        PndAnalysis* theAnalysis = new PndAnalysis();
        if (nevts==0) nevts= theAnalysis->GetEntries();

        int i=0;

        RhoCandList kp, km, pip, pim, d0, d0b, all;
        TString pidsel = "PidAlgoEmcBayes;PidAlgoDrc;PidAlgoDisc;PidAlgoStt;PidAlgoMdtHardCuts";

        RhoMassParticleSelector *fD0Sel = new RhoMassParticleSelector("D0Sel",   1.864, 1.0);
        RhoVtxPoca fVtxPoca;

        RhoTuple *nd0 = new RhoTuple("nd0","my D0 tuple");

        // *** practical helper class to dump stuff to ntuple
        PndRhoTupleQA qa(theAnalysis,pbarmom);

        // *** the event loop
        while (theAnalysis->GetEvent() && i++<nevts)
        {
                if ((i%100)==0) cout<<"evt " << i << endl;

                // ***
                // *** HERE YOUR ANALYSIS CODE GOES!
                // ***
                theAnalysis->FillList( all, "All",          pidsel); // only needed for PndEventShape object
                theAnalysis->FillList( kp,  "KaonAllPlus",  pidsel);
                theAnalysis->FillList( km,  "KaonAllMinus", pidsel);
                theAnalysis->FillList( pip, "PionAllPlus",  pidsel);
                theAnalysis->FillList( pim, "PionAllMinus", pidsel);

                PndEventShape evsh(all,ini,0.03,0.1);

                d0.Combine(km, pip);
                d0.SetType(421);
                d0b.Combine(kp, pim);
                d0b.SetType(-421);
                d0.Append(d0b);

                // *** do some preselection
                d0.Select(fD0Sel);

                // *** store all kinf of information to RhoTuple
                for (int j=0;j<d0.GetLength();++j)
                {
                        nd0->Column("ev",               (Float_t) i);
                        nd0->Column("cand",             (Float_t) j);
                        nd0->Column("d0miss",   (Float_t) (ini-(d0[j]->P4())).M());

                        qa.qaComp("d0", d0[j], nd0);

                        qa.qaP4("beam", ini, nd0);
                        qa.qaEventShapeShort("es",&evsh,nd0);

                        nd0->DumpData();
                }


        }

        // *** write out all the histos
        out->cd();
        nd0->GetInternalTree()->Write();
        out->Save();
        out->Close();

}