-AliPhysicsSelectionTask* AddTaskPhysicsSelection(Bool_t mCAnalysisFlag = kFALSE, Bool_t withBckgndRejection = kTRUE)
+AliPhysicsSelectionTask* AddTaskPhysicsSelection(Bool_t mCAnalysisFlag = kFALSE, Bool_t withBckgndRejection = kTRUE, Bool_t computeBG = kFALSE)
{
AliAnalysisManager *mgr = AliAnalysisManager::GetAnalysisManager();
if (!mgr) {
physSel->AddBackgroundIdentification(new AliBackgroundSelection());
if (mCAnalysisFlag)
physSel->SetAnalyzeMC();
+ if (computeBG)
+ physSel->SetComputeBG();
AliAnalysisDataContainer *cinput0 = mgr->GetCommonInputContainer();
AliAnalysisDataContainer *coutput1 = mgr->CreateContainer("cstatsout",