Performance of a liquid argon preshower detector integrated with an Accordion calorimeter

Abstract A prototype liquid argonpreshower detector with a strip granularity of 2.5 mm has been tested at the CERN SPS in front of a liquid argon Accordion calorimeter. For charged tracks a signal-to- noise ratioof 9.4 and a space resolution of 340 μm were measured; the rejection power against overlapping photons produced in the decay of 50 GeV π 0 's is larger than 3; the precision on