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A Lead Tungstate crystal produced for the electromagnetic calorimeter of theCMS experiment at the LHC was cut into three equal-length sections. The centralone was irradiated with 290 MeV/c positive pions up to a fluence of (5.67 +-0.46)x10^13 /cm^2, while the other two were exposed to a 24 GeV/c protonfluence of (1.17 +- 0.11) x 10^13/ cm^2. The damage recovery in these crystals,stored in the dark at room temperature, has been followed over two years. Thecomparison of the radiation-induced changes in light transmission for thesecrystals shows that damage is proportional to the star densities produced bythe irradiation.

Comparison between high-energy proton and charged pion induced damage in Lead Tungstate calorimeter crystals