MomSampler Node1 MomSampler + m_val + m_mass + MomSampler() + ~MomSampler() + shoot() Node2 NullMomSampler + ~NullMomSampler() + NullMomSampler() + shoot() Node1->Node2 Node3 PtEtaMPhiSampler - m_pt - m_eta - m_phi + ~PtEtaMPhiSampler() + PtEtaMPhiSampler() + shoot() Node1->Node3