message: Use pion mass as a const.
diff: // author: Bong-Hwi Lim (bong-hwi.lim@cern.ch)
  // , Beomkyu KIM (kimb@cern.ch)
  //
  -// Last Modified Date: 2019/06/30
  +// Last Modified Date: 2019/07/06
  //
  ////////////////////////////////////////////////////////////////////////////
  @@ -1389,7 +1389,7 @@ void AliAnalysisTaskXi1530::FillTracks() {
  continue;
  temp2.SetXYZM(track1->Px(), track1->Py(), track1->Pz(),
  - track1->M());
  + pionmass);
  vecsum = temp1 + temp2; // temp1 = cascade, temp2=pion
  // Y cut
  @@ -1681,7 +1681,7 @@ void AliAnalysisTaskXi1530::FillTracks() {
  track1->GetID() == bTrackXi->GetID())
  continue;
  temp2.SetXYZM(track1->Px(), track1->Py(), track1->Pz(),
  - track1->M());
  + pionmass);
  vecsum = temp1 + temp2; // two pion vector sum
  if ((Xicandidate->Charge() == -1 && track1->Charge() == -1) ||
  @@ -1994,7 +1994,7 @@ void AliAnalysisTaskXi1530::FillTracksAOD() {
  }
  */
  temp2.SetXYZM(track1->Px(), track1->Py(), track1->Pz(),
  - track1->M());
  + pionmass);
  vecsum = temp1 + temp2; // temp1 = cascade, temp2=pion
  // Y cut
  @@ -2283,7 +2283,7 @@ void AliAnalysisTaskXi1530::FillTracksAOD() {
  track1->GetID() == bTrackXi->GetID())
  continue;
  temp2.SetXYZM(track1->Px(), track1->Py(), track1->Pz(),
  - track1->M());
  + pionmass);
  vecsum = temp1 + temp2; // two pion vector sum
  if ((Xicandidate->ChargeXi() == -1 && track1->Charge() == -1) ||
  