Performance of the PrimEx Electromagnetic Calorimeter

Abstract

We report the design and performance of the hybrid electromagnetic calorimeter consisting of 1152 $PbW{O}_4$ crystals and 576 lead glass blocks for the PrimEx experiment at the Jefferson Laboratory. The detector was built for high precision measurement of the neutral pion lifetime via the Primakoff effect. Calorimeter installation and commissioning was completed with the first physics run in fall of 2004. We present the energy and position resolution of the calorimeter. Obtained ${\pi }^0$ mass resolution of $1.3MeV/{\mathrm{c}}^2$ and its production angle resolution of $0.34\mathrm{mrad}$ demonstrate the ability of the experiment to extract the ${\pi }^0$ lifetime on one percent level.

8 pages, 7 figures, talk on the CALOR06 Conference, Chicago

Cited by in corpus (4)

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• Chiral expansions of the pi0 lifetime
• First study of radiation hardness of lead tungstate crystals at low temperatures
• Scintillating crystals for the Neutral Particle Spectrometer in Hall C at JLab