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 "AliRunLoader.h"
  30 #include <TFolder.h>
  31 #include <TTree.h>
  32 #include <TPDGCode.h>
  33
  34
  35 ClassImp(AliMonitorV0s)
  36
  37
  38 //_____________________________________________________________________________
  39 AliMonitorV0s::AliMonitorV0s()
  40 {
  41 // create a monitor object for V0s
  42
  43 }
  44
  45 //_____________________________________________________________________________
  46 AliMonitorV0s::AliMonitorV0s(const AliMonitorV0s& monitor) :
  47   AliMonitor(monitor)
  48 {
  49   Fatal("AliMonitorV0s", "copy constructor not implemented");
  50 }
  51
  52 //_____________________________________________________________________________
  53 AliMonitorV0s& AliMonitorV0s::operator = (const AliMonitorV0s& /*monitor*/)
  54 {
  55   Fatal("operator =", "assignment operator not implemented");
  56   return *this;
  57 }
  58
  59
  60 //_____________________________________________________________________________
  61 void AliMonitorV0s::CreateHistos(TFolder* folder)
  62 {
  63 // create the V0s monitor histograms
  64
  65   fFolder = folder->AddFolder("V0s", "V0s");
  66
  67   fRadius = CreateHisto1("Radius", "radius of V0 vertices",
  68                          90, 0., 3., "r_{xy} [cm]",
  69                          "#Delta N/N", AliMonitorHisto::kNormEvents);
  70
  71   fMassK0 = CreateHisto1("MassK0", "invariant mass of K^{0} candidates",
  72                          50, 0.4, 0.6, "m_{#pi^{+}#pi^{-}} [GeV/c^{2}]",
  73                          "#Delta N/N", AliMonitorHisto::kNormEvents);
  74
  75   fMassLambda = CreateHisto1("MassLambda",
  76                              "invariant mass of #Lambda candidates",
  77                              50, 1.0, 1.2, "m_{p#pi^{-}} [GeV/c^{2}]",
  78                              "#Delta N/N", AliMonitorHisto::kNormEvents);
  79
  80   fMassAntiLambda = CreateHisto1("MassAntiLambda",
  81                                  "invariant mass of #bar{#Lambda} candidates",
  82                                  50, 1.0, 1.2,
  83                                  "m_{#bar{p}#pi^{+}} [GeV/c^{2}]",
  84                                  "#Delta N/N", AliMonitorHisto::kNormEvents);
  85 }
  86
  87
  88 //_____________________________________________________________________________
  89 void AliMonitorV0s::FillHistos(AliRunLoader* runLoader,
  90                                AliRawReader*)
  91 {
  92 // fill the TPC-ITS correlation monitor histogrms
  93
  94   AliITSLoader* itsLoader = (AliITSLoader*) runLoader->GetLoader("ITSLoader");
  95   if (!itsLoader) return;
  96
  97   itsLoader->LoadV0s();
  98   TTree* v0s = itsLoader->TreeV0();
  99   if (!v0s) return;
 100   AliV0vertex* vertex = new AliV0vertex;
 101   v0s->SetBranchAddress("vertices", &vertex);
 102
 103   for (Int_t i = 0; i < v0s->GetEntries(); i++) {
 104     v0s->GetEntry(i);
 105     Double_t x, y, z;
 106     vertex->GetXYZ(x, y, z);
 107     fRadius->Fill(TMath::Sqrt(x*x + y*y));
 108     vertex->ChangeMassHypothesis(kK0Short);
 109     fMassK0->Fill(vertex->GetEffMass());
 110     vertex->ChangeMassHypothesis(kLambda0);
 111     fMassLambda->Fill(vertex->GetEffMass());
 112     vertex->ChangeMassHypothesis(kLambda0Bar);
 113     fMassAntiLambda->Fill(vertex->GetEffMass());
 114   }
 115
 116   delete vertex;
 117   itsLoader->UnloadV0s();
 118 }