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First commit

PeterParfenov 11 months ago
commit
a7835df836
2 changed files with 1376 additions and 0 deletions
  1. 65 0
      refMultReader.C
  2. 1311 0
      refMultReader.h

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refMultReader.C

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+#define refMultReader_cxx
+#include "refMultReader.h"
+#include <TH2.h>
+#include <TStyle.h>
+#include <TFile.h>
+#include <TCanvas.h>
+
+#include <iostream>
+
+void refMultReader::Loop(const char* outfile)
+{
+//   In a ROOT session, you can do:
+//      root> .L refMultReader.C
+//      root> refMultReader t
+//      root> t.GetEntry(12); // Fill t data members with entry number 12
+//      root> t.Show();       // Show values of entry 12
+//      root> t.Show(16);     // Read and show values of entry 16
+//      root> t.Loop();       // Loop on all entries
+//
+
+//     This is the loop skeleton where:
+//    jentry is the global entry number in the chain
+//    ientry is the entry number in the current Tree
+//  Note that the argument to GetEntry must be:
+//    jentry for TChain::GetEntry
+//    ientry for TTree::GetEntry and TBranch::GetEntry
+//
+//       To read only selected branches, Insert statements like:
+// METHOD1:
+//    fChain->SetBranchStatus("*",0);  // disable all branches
+//    fChain->SetBranchStatus("branchname",1);  // activate branchname
+// METHOD2: replace line
+//    fChain->GetEntry(jentry);       //read all branches
+//by  b_branchname->GetEntry(ientry); //read only this branch
+   if (fChain == 0) return;
+
+   TH1F *hMult = new TH1F("hRefMult","refMult (|#eta|<0.5, p_{T}>0.15 GeV/c)",2500,0.,2500.);
+
+   // Long64_t nentries = fChain->GetEntriesFast();
+   Long64_t nentries = 500e3;
+
+   Long64_t nbytes = 0, nb = 0;
+   Int_t refMult;
+   for (Long64_t jentry=0; jentry<nentries;jentry++) {
+      Long64_t ientry = LoadTree(jentry);
+      if (ientry < 0) break;
+      nb = fChain->GetEntry(jentry);   nbytes += nb;
+      // if (Cut(ientry) < 0) continue;
+      if (jentry%1000==0) std::cout << "Event [" << jentry << "/"
+				<< nentries << "]" << std::endl;
+      refMult = 0;
+      for (int iTr=0; iTr<n_tracks_mpd; iTr++)
+      {
+        if (TMath::Abs(signed_pt_mpd[iTr]) < 0.15) continue;
+        if (TMath::Abs(eta_mpd[iTr]) > 0.5) continue;
+        if (n_hits_mpd[iTr] < 32) continue;
+        refMult++;
+      }
+      hMult->Fill(refMult);
+   }
+   TFile *fo = new TFile(outfile,"recreate");
+   fo->cd();
+   hMult->Write();
+   fo->Close();
+}

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refMultReader.h