The clusters of energy reconstructed in the LAr calorimeter are input to the reconstruction and identification of electrons, photons and jets.  In ATLAS, this is the responsibility of the Combined Performance Groups which report to Physics Coordination.

Due to its commitment in the LAr calorimeter and in the Higgs searches in channels involving photons and electrons, the group had from the beginning a long and strong involvement in the E/gamma working group .

The group contributes also to the Jet/Etmiss working group which studies the performance of the jets and the missing transverse momentum.