The KLOE electromagnetic calorimeter

The KLOE detector was designed primarily For the study of CP violation in neutral kaon decays at DAPhiNE, the Frascati Phi-factory. The detector consists of a tracker and an electromagnetic calorimeter. A lead-scintillating-fiber sampling calorimeter satisfies best the requirements of the experiment. providing adequate energy resolution and superior timing accuracy. We describe in the following the construction of the calorimeter, its calibration and how the calorimeter information is used to obtain energy, point of entry and time of the arrival of photons, electrons and charged particles. With e(+)e(-) collision data at DAPhiNE for an integrated luminosity of some 2 pb(-1) we find for electromagnetic showers, an energy resolution of 5.7%/rootE(GeV) and a time resolution of 54/rootE(GeV) ps. We also present a measurement of efficiency for low energy photons. (C) 2002 Elsevier Science B.V. All rights reserved.