Fill vertexing chi2PCA for triplets

Author: sigurdnese

PWGDQ/Core/VarManager.h

@@ -3803,6 +3803,7 @@ void VarManager::FillTripletVertexing(C const& collision, T const& t1, T const&
     values[VarManager::kVertexingProcCode] = procCode;
     if (procCode == 0) {
       // TODO: set the other variables to appropriate values and return
+      values[kVertexingChi2PCA] = -999.;
       values[kVertexingLxy] = -999.;
       values[kVertexingLxyz] = -999.;
       values[kVertexingLz] = -999.;
@@ -3837,6 +3838,10 @@ void VarManager::FillTripletVertexing(C const& collision, T const& t1, T const&
       o2::dataformats::VertexBase primaryVertex = {std::move(vtxXYZ), std::move(vtxCov)};
       auto covMatrixPV = primaryVertex.getCov();
 
+      auto chi2PCA = fgFitterThreeProngBarrel.getChi2AtPCACandidate();
+      if (fgUsedVars[kVertexingChi2PCA])
+        values[VarManager::kVertexingChi2PCA] = chi2PCA;
+
       double phi = std::atan2(secondaryVertex[1] - collision.posY(), secondaryVertex[0] - collision.posX());
       double theta = std::atan2(secondaryVertex[2] - collision.posZ(),
                                 std::sqrt((secondaryVertex[0] - collision.posX()) * (secondaryVertex[0] - collision.posX()) +