The new cluster-track matching program first identify electrons and muons with external particle-ID devices. Then EM-cluster--track matching is performed which is followed by HD-cluster-hadron-track matching. The cluster-track matching proceeds as follows. We first form global calorimetric clusters, which are contiguous calorimeter blocks with nonzero energy deposites (see Fig.1.1).
When such a global cluster contains no matched charged track, the cluster is recognized as a pure neutral particle and we assign a 4-momentum:
On the other hand, when the energy of the global cluster EG is consistent with the energy of the corresponding charged tracks EC:
When the above matching condition is not satisfied: