Performance of prototypes for the ALICE electromagnetic calorimeter

TL;DR

This study evaluates the performance of prototypes for the ALICE electromagnetic calorimeter, demonstrating promising energy resolution, uniformity, linearity, and particle identification capabilities in test beam experiments.

Contribution

It provides the first comprehensive test beam performance results of the final design modules for the ALICE electromagnetic calorimeter.

Findings

Energy resolution of about 11%/√E + 1.7%

Uniform response to electrons within 1%

Hadron rejection factor >600 at 90% electron ID efficiency

Abstract

The performance of prototypes for the ALICE electromagnetic sampling calorimeter has been studied in test beam measurements at FNAL and CERN. A $4\times4$ array of final design modules showed an energy resolution of about 11% /$\sqrt{E(\mathrm{GeV})}$ $\oplus$ 1.7 % with a uniformity of the response to electrons of 1% and a good linearity in the energy range from 10 to 100 GeV. The electromagnetic shower position resolution was found to be described by 1.5 mm $\oplus$ 5.3 mm /$\sqrt{E \mathrm{(GeV)}}$. For an electron identification efficiency of 90% a hadron rejection factor of $>600$ was obtained.