Construction and Response of a Highly Granular Scintillator-based Electromagnetic Calorimeter

TL;DR

This paper reports on the development and testing of a highly granular scintillator-based electromagnetic calorimeter prototype designed for future lepton collider experiments, demonstrating excellent linearity and energy resolution in beam tests.

Contribution

The paper introduces a novel highly granular scintillator calorimeter prototype with detailed performance evaluation using test beam data.

Findings

Deviations from linear response less than 1.1%

Intrinsic energy resolution approximately 12.5%/√E plus 1.2%

Prototype successfully tested with electrons from 2 to 32 GeV

Abstract

A highly granular electromagnetic calorimeter with scintillator strip readout is being developed for future lepton collider experiments. A prototype of 21.5 $X_0$ depth and $180 \times 180 $mm$^2$ transverse dimensions was constructed, consisting of 2160 individually read out $10 \times 45 \times 3$ mm$^3$ scintillator strips. This prototype was tested using electrons of 2--32 GeV at the Fermilab Test Beam Facility in 2009. Deviations from linear energy response were less than 1.1\%, and the intrinsic energy resolution was determined to be $(12.5 \pm 0.1 (\mathrm{stat.}) \pm0.4 (\mathrm{syst.}))\%/\sqrt{E[\mathrm{GeV}]}\oplus (1.2 \pm 0.1(\mathrm{stat.})^{+0.6}_{-0.7}(\mathrm{syst.}))\%$, where the uncertainties correspond to statistical and systematic sources, respectively.