ILD SiW ECAL and sDHCAL dimension-performance optimisation

TL;DR

This paper investigates the impact of dimension optimization of the ILD detector's calorimeters on performance and cost, showing that smaller dimensions slightly degrade jet energy resolution but can halve costs, with comparable performance between different calorimeter types.

Contribution

It presents a detailed simulation-based analysis of how reducing ILD dimensions affects calorimeter performance and cost, highlighting optimal configurations for future collider detectors.

Findings

Reducing ILD size by ~1.3 times degrades jet energy resolution by 8-19%.

Cost of ILD scales roughly quadratically with size, potentially halving with dimension reduction.

Performance between sDHCAL and AHCAL is comparable at an inner ECAL radius of about 1.4 m.

Abstract

The ILD, International Large Detector, is one of the detector concepts for a future linear collider. Its performance is investigated using Monte-Carlo full simulation and PandoraPFA. Among several options, a combination of the silicon-tungsten electromagnetic calorimeter (SiW ECAL) and the semi-digital hadronic calorimeter (sDHCAL) presenting the highest granularity calorimeters, is here investigated. It is shown that by reducing the radius and length of the entire detector by a factor of $\sim1.3$ with respect to the baseline dimensions, the jet energy resolution is degraded by 8 to 19% in the range of 45 and 250 GeV. The price of ILD which scales roughly quadratically with the ILD dimensions may be reduced by a factor of nearly two. A similar study made with the SiW ECAL and the analog hadronic calorimeter (AHCAL) shows that for an inner radius of ECAL of about~1.4 m, the performance is comparable between sDHCAL and AHCAL.