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 "AliESDEvent.h"
  28 #include "AliESDv0.h"
  29 #include "AliLog.h"
  30 #include <TFolder.h>
  31 #include <TPDGCode.h>
  32 #include <TMath.h>
  33
  34
  35 ClassImp(AliMonitorV0s)
  36
  37
  38 //_____________________________________________________________________________
  39 AliMonitorV0s::AliMonitorV0s():
  40   AliMonitor(),
  41   fRadius(NULL),
  42   fMassK0(NULL),
  43   fMassLambda(NULL),
  44   fMassAntiLambda(NULL)
  45 {
  46 // create a monitor object for V0s
  47
  48 }
  49
  50 //_____________________________________________________________________________
  51 void AliMonitorV0s::CreateHistos(TFolder* folder)
  52 {
  53 // create the V0s monitor histograms
  54
  55   fFolder = folder->AddFolder("V0s", "V0s");
  56
  57   fRadius = CreateHisto1("Radius", "radius of V0 vertices",
  58                          90, 0., 3., "r_{xy} [cm]",
  59                          "#Delta N/N", AliMonitorHisto::kNormEvents);
  60
  61   fMassK0 = CreateHisto1("MassK0", "invariant mass of K^{0} candidates",
  62                          50, 0.4, 0.6, "m_{#pi^{+}#pi^{-}} [GeV/c^{2}]",
  63                          "#Delta N/N", AliMonitorHisto::kNormEvents);
  64
  65   fMassLambda = CreateHisto1("MassLambda",
  66                              "invariant mass of #Lambda candidates",
  67                              50, 1.0, 1.2, "m_{p#pi^{-}} [GeV/c^{2}]",
  68                              "#Delta N/N", AliMonitorHisto::kNormEvents);
  69
  70   fMassAntiLambda = CreateHisto1("MassAntiLambda",
  71                                  "invariant mass of #bar{#Lambda} candidates",
  72                                  50, 1.0, 1.2,
  73                                  "m_{#bar{p}#pi^{+}} [GeV/c^{2}]",
  74                                  "#Delta N/N", AliMonitorHisto::kNormEvents);
  75 }
  76
  77
  78 //_____________________________________________________________________________
  79 void AliMonitorV0s::FillHistos(AliRunLoader* /*runLoader*/,
  80                                AliRawReader*, AliESDEvent* esd)
  81 {
  82 // fill the V0s monitor histogrms
  83
  84   for (Int_t i = 0; i < esd->GetNumberOfV0s(); i++) {
  85     AliESDv0* v0 = esd->GetV0(i);
  86     if (!v0) continue;
  87     Double_t x, y, z;
  88     v0->GetXYZ(x, y, z);
  89     fRadius->Fill(TMath::Sqrt(x*x + y*y));
  90     v0->ChangeMassHypothesis(kK0Short);
  91     fMassK0->Fill(v0->GetEffMass());
  92     v0->ChangeMassHypothesis(kLambda0);
  93     fMassLambda->Fill(v0->GetEffMass());
  94     v0->ChangeMassHypothesis(kLambda0Bar);
  95     fMassAntiLambda->Fill(v0->GetEffMass());
  96   }
  97 }