Response of the CALICE Si-W Electromagnetic Calorimeter Physics Prototype to Electrons

TL;DR

This paper reports on the testing of a silicon-tungsten electromagnetic calorimeter prototype at CERN, demonstrating its linear response, energy resolution, and stability for electron energies between 6 and 45 GeV.

Contribution

The study provides detailed characterization of a CALICE Si-W ECAL prototype's response to electrons, including energy resolution, linearity, and stability, during beam tests at CERN.

Findings

ECAL response is linear within 1%

Energy resolution follows (16.6/√E + 1.1)%

Stable spatial uniformity and time stability observed

Abstract

A prototype Silicon-Tungsten electromagnetic calorimeter (ECAL) for an International Linear Collider (ILC) detector was installed and tested during summer and autumn 2006 at CERN. The detector had 6480 silicon pads of dimension 1x1 cm^2. Data were collected with electron beams in the energy range 6 to 45 GeV. The analysis described in this paper focuses on electromagnetic shower reconstruction and characterises the ECAL response to electrons in terms of energy resolution and linearity. The detector is linear to within approximately the 1% level and has a relative energy resolution of (16.6 +- 0.1)/ \sqrt{E(GeV}) + 1.1 +- 0.1 (%). The spatial uniformity and the time stability of the ECAL are also addressed.