MONITOR/AliMonitorV0s.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
   5  * Contributors are mentioned in the code where appropriate.              *
   6  *                                                                        *
   7  * Permission to use, copy, modify and distribute this software and its   *
   8  * documentation strictly for non-commercial purposes is hereby granted   *
   9  * without fee, provided that the above copyright notice appears in all   *
  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 /* $Id$ */
  17
  18 ///////////////////////////////////////////////////////////////////////////////
  19 //                                                                           //
  20 //  This class creates and fills the monitor histograms for V0s              //
  21 //                                                                           //
  22 ///////////////////////////////////////////////////////////////////////////////
  23
  24
  25 #include "AliMonitorV0s.h"
  26 #include "AliMonitorHisto.h"
  27 #include "AliITSLoader.h"
  28 #include "AliV0vertex.h"
  29 #include <TPDGCode.h>
  30
  31
  32 ClassImp(AliMonitorV0s)
  33
  34
  35 //_____________________________________________________________________________
  36 AliMonitorV0s::AliMonitorV0s()
  37 {
  38 // create a monitor object for V0s
  39
  40 }
  41
  42
  43 //_____________________________________________________________________________
  44 void AliMonitorV0s::CreateHistos(TFolder* folder)
  45 {
  46 // create the V0s monitor histograms
  47
  48   fFolder = folder->AddFolder("V0s", "V0s");
  49
  50   fRadius = CreateHisto1("Radius", "radius of V0 vertices",
  51                          90, 0., 3., "r_{xy} [cm]",
  52                          "#Delta N/N", AliMonitorHisto::kNormEvents);
  53
  54   fMassK0 = CreateHisto1("MassK0", "invariant mass of K^{0} candidates",
  55                          50, 0.4, 0.6, "m_{#pi^{+}#pi^{-}} [GeV/c^{2}]",
  56                          "#Delta N/N", AliMonitorHisto::kNormEvents);
  57
  58   fMassLambda = CreateHisto1("MassLambda",
  59                              "invariant mass of #Lambda candidates",
  60                              50, 1.0, 1.2, "m_{p#pi^{-}} [GeV/c^{2}]",
  61                              "#Delta N/N", AliMonitorHisto::kNormEvents);
  62
  63   fMassAntiLambda = CreateHisto1("MassAntiLambda",
  64                                  "invariant mass of #bar{#Lambda} candidates",
  65                                  50, 1.0, 1.2,
  66                                  "m_{#bar{p}#pi^{+}} [GeV/c^{2}]",
  67                                  "#Delta N/N", AliMonitorHisto::kNormEvents);
  68 }
  69
  70
  71 //_____________________________________________________________________________
  72 void AliMonitorV0s::FillHistos(AliRunLoader* runLoader,
  73                                AliRawReader*)
  74 {
  75 // fill the TPC-ITS correlation monitor histogrms
  76
  77   AliITSLoader* itsLoader = (AliITSLoader*) runLoader->GetLoader("ITSLoader");
  78   if (!itsLoader) return;
  79
  80   itsLoader->LoadV0s();
  81   TTree* v0s = itsLoader->TreeV0();
  82   if (!v0s) return;
  83   AliV0vertex* vertex = new AliV0vertex;
  84   v0s->SetBranchAddress("vertices", &vertex);
  85
  86   for (Int_t i = 0; i < v0s->GetEntries(); i++) {
  87     v0s->GetEntry(i);
  88     Double_t x, y, z;
  89     vertex->GetXYZ(x, y, z);
  90     fRadius->Fill(TMath::Sqrt(x*x + y*y));
  91     vertex->ChangeMassHypothesis(kK0Short);
  92     fMassK0->Fill(vertex->GetEffMass());
  93     vertex->ChangeMassHypothesis(kLambda0);
  94     fMassLambda->Fill(vertex->GetEffMass());
  95     vertex->ChangeMassHypothesis(kLambda0Bar);
  96     fMassAntiLambda->Fill(vertex->GetEffMass());
  97   }
  98
  99   delete vertex;
 100   itsLoader->UnloadV0s();
 101 }