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[u/mrichter/AliRoot.git] / PWG2 / FORWARD / analysis2 / AddTaskFMDELoss.C

/**
 * @file   AddTaskFMDELoss.C
 * @author Christian Holm Christensen <cholm@dalsgaard.hehi.nbi.dk>
 * @date   Wed Mar 23 12:14:03 2011
 * 
 * @brief  
 * 
 * 
 * @ingroup pwg2_forward_scripts_tasks
 */
/**
 * @defgroup pwg2_forward_eloss Energy Loss Fits
 * @ingroup pwg2_forward_topical
 */

/**
 * This is the macro to include the FMD energy fitter in a train.  
 * 
 * @ingroup pwg2_forward_eloss
 */
AliAnalysisTask*
AddTaskFMDELoss(Bool_t mc, Bool_t useCent)
{
  gSystem->Load("libPWG2forward2");

  AliAnalysisManager *mgr = AliAnalysisManager::GetAnalysisManager();
  if (!mgr) {
    Error("AddTaskFMDELoss", "No analysis manager to connect to.");
    return NULL;
  }   
  
  // --- Make the task and add it to the manager ---------------------
  AliFMDEnergyFitterTask* task = new AliFMDEnergyFitterTask("fmdEnergyFitter");
  // task->SetBLow(blow);
  // task->SetBLow(bhigh);
  mgr->AddTask(task);
  
  // --- Set parameters on the algorithms ----------------------------
  // Set the number of SPD tracklets for which we consider the event a
  // low flux event
  task->GetEventInspector().SetLowFluxCut(1000); 
  // Set the maximum error on v_z [cm]
  task->GetEventInspector().SetMaxVzErr(0.2);
  // Set the eta axis to use - note, this overrides whatever is used
  // by the rest of the algorithms - but only for the energy fitter
  // algorithm. 
  task->GetEnergyFitter().SetEtaAxis(200, -4, 6);
  // Set maximum energy loss to consider 
  task->GetEnergyFitter().SetMaxE(15); 
  // Set number of energy loss bins 
  task->GetEnergyFitter().SetNEbins(100);
  // Set whether to use increasing bin sizes 
  task->GetEnergyFitter().SetUseIncreasingBins(true);
  // Set whether to do fit the energy distributions 
  task->GetEnergyFitter().SetDoFits(kTRUE);
  // Set whether to make the correction object 
  task->GetEnergyFitter().SetDoMakeObject(kTRUE);
  // Set the low cut used for energy
  task->GetEnergyFitter().SetLowCut(0.4);
  // Set the number of bins to subtract from maximum of distributions
  // to get the lower bound of the fit range
  task->GetEnergyFitter().SetFitRangeBinWidth(4);
  // Set the maximum number of landaus to try to fit (max 5)
  task->GetEnergyFitter().SetNParticles(5);
  // Set the minimum number of entries in the distribution before
  // trying to fit to the data
  task->GetEnergyFitter().SetMinEntries(1000);
  // --- Set limits on fits the energy -------------------------------
  // Maximum relative error on parameters 
  AliFMDCorrELossFit::ELossFit::fgMaxRelError = .12;
  // Least weight to use 
  AliFMDCorrELossFit::ELossFit::fgLeastWeight = 1e-5;
  // Maximum value of reduced chi^2 
  AliFMDCorrELossFit::ELossFit::fgMaxChi2nu   = 10;
    
  // --- Make the output container and connect it --------------------
  TString outputfile = AliAnalysisManager::GetCommonFileName();
  // outputfile += ":PWG2forwardDnDeta"; 
  // Form(":%s",pars->GetDndetaAnalysisName());
  AliAnalysisDataContainer* histOut = 
    mgr->CreateContainer("Forward", TList::Class(), 
			 AliAnalysisManager::kOutputContainer,outputfile);
  mgr->ConnectInput(task, 0, mgr->GetCommonInputContainer());
  mgr->ConnectOutput(task, 1, histOut);

  return task;
}