message: Update GetImpactParameters function for nano
diff: @@ -780,17 +780,17 @@ Bool_t AliAnalysisTaskNanoCheck::GoodCascadeSelection(){
  DCADist_Xi_PV = TMath::Abs(
  Xicandidate->GetDcascade(lPosPV[0], lPosPV[1], lPosPV[2]));
  if (isXiMinus) { // Xi- has +proton, -pion
  - pTrackXi->GetImpactParameters(b, bCov);
  + GetImpactParam(pTrackXi, b, bCov);
  DCADist_LambdaProton_PV = b[0];
  - nTrackXi->GetImpactParameters(b, bCov);
  + GetImpactParam(nTrackXi, b, bCov);
  DCADist_LambdaPion_PV = b[0];
  } else {
  - nTrackXi->GetImpactParameters(b, bCov);
  + GetImpactParam(nTrackXi, b, bCov);
  DCADist_LambdaProton_PV = b[0];
  - pTrackXi->GetImpactParameters(b, bCov);
  + GetImpactParam(pTrackXi, b, bCov);
  DCADist_LambdaPion_PV = b[0];
  }
  - bTrackXi->GetImpactParameters(b, bCov);
  + GetImpactParam(bTrackXi, b, bCov);
  DCADist_BachelorPion_PV = b[0];
  fHistos->FillTH1("QA_Xi/hDCADist_lambda_to_PV",
  DCADist_Lambda_PV);
  @@ -936,17 +936,17 @@ Bool_t AliAnalysisTaskNanoCheck::GoodCascadeSelection(){
  DCADist_Xi_PV = TMath::Abs(Xicandidate_aod->DcaXiToPrimVertex(
  lPosPV[0], lPosPV[1], lPosPV[2]));
  if (isXiMinus) { // Xi- has +proton, -pion
  - pTrackXi->GetImpactParameters(b, bCov);
  + GetImpactParam(pTrackXi, b, bCov);
  DCADist_LambdaProton_PV = b[0];
  - nTrackXi->GetImpactParameters(b, bCov);
  + GetImpactParam(nTrackXi, b, bCov);
  DCADist_LambdaPion_PV = b[0];
  } else {
  - nTrackXi->GetImpactParameters(b, bCov);
  + GetImpactParam(nTrackXi, b, bCov);
  DCADist_LambdaProton_PV = b[0];
  - pTrackXi->GetImpactParameters(b, bCov);
  + GetImpactParam(pTrackXi, b, bCov);
  DCADist_LambdaPion_PV = b[0];
  }
  - bTrackXi->GetImpactParameters(b, bCov);
  + GetImpactParam(bTrackXi, b, bCov);
  DCADist_BachelorPion_PV = b[0];
  /*
  // typical AOD method
  