Tile and crystal calorimeter for KLOE-2 experiment

TL;DR

This paper discusses the design and implementation of specialized tile and crystal calorimeters for the KLOE-2 experiment to enhance photon detection and event reconstruction near the quadrupoles, improving experimental capabilities.

Contribution

It introduces a new tile calorimeter with high granularity and a dense crystal calorimeter with high time resolution for the KLOE-2 experiment upgrade.

Findings

Design of a tile calorimeter with 2500 SiPMs for low energy photon detection

Proposal of a dense crystal calorimeter using LYSO or PbWO4 crystals

Enhanced acceptance for multiphoton events in KLOE-2

Abstract

The upgrade of the DA$\Phi$NE machine layout requires a modification of the size and position of the inner focusing quadrupoles of KLOE$^2$ thus asking for the realization of two new calorimeters covering the quadrupoles area. To improve the reconstruction of $K_L\to 2\pi^0$ events with photons hitting the quadrupoles, a tile calorimeter, QCALT, with high efficiency to low energy photons (20-300 MeV), time resolution of less than 1 ns and space resolution of few cm, is needed. We propose a tile calorimeter with a high granularity readout corresponding to about 2500 silicon photomultipliers (SiPM) of $1\times 1$ mm$^2$ area. Moreover, the low polar angle regions need the realization of a dense crystal calorimeter with very high time resolution performances to extend the acceptance for multiphotons events. Best candidates for this calorimeter are LYSO crystals with APD readout or PbWO$_4$ crystals with large area SIPM readout.