The KLOE detector is designed primarily for the study of direct CP violation in K⁰ decays. The electromagnetic calorimeter, EmC, is a most demanding element of the detector. Two prototypes of the EmC (one for the barrel and one for the end-cap region) have been built at Frascati and tested at PSI (Switzerland) using beams of electrons, muons and pions of 40 to 290 MeV/c momentum, and at the Frascati LADON facility using photons of 20 to 80 MeV. We observe excellent linearity from 20 to 290 MeV. The energy resolution is σ (E) /E ≈4. 4% √ (EGeV) and the time resolution is ≈34ps/√ (EGeV). We found little dipendence on incidence angle and entry position. We also determined that some π/μ identification is possible.
A. et al. (Thu,) studied this question.