Measurement of shower development and its $\textit{Moli\`ere radius}$ with a four-plane LumiCal test set-up

TL;DR

This paper reports on beam tests of a prototype luminometer designed for future electron-positron colliders, focusing on electromagnetic shower development, comparison with simulations, and measurement of the Molière radius.

Contribution

It presents the first multi-plane operation test of a LumiCal prototype and measures its Molière radius, validating simulation models.

Findings

Successful demonstration of multi-plane operation

Agreement between measured and simulated shower development

Measured Molière radius for the prototype

Abstract

A prototype of a luminometer, designed for a future $e^{+}e^{-}$ collider detector, and consisting at present of a four-plane module, was tested in the CERN PS accelerator T9 beam. The objective of this beam test was to demonstrate a multi-plane operation, to study the development of the electromagnetic shower and to compare it with MC simulations. In addition, the effective $\textit{Moli\`ere radius}$ of this configuration is extracted.