Particle Flow with a Hybrid Segmented Crystal and Fiber Dual-Readout Calorimeter

TL;DR

This paper presents a novel particle flow algorithm tailored for a hybrid dual-readout calorimeter, demonstrating improved jet energy resolution for future e+e- collider experiments by leveraging the calorimeter's excellent energy resolution and linearity.

Contribution

The paper introduces the dual-readout particle flow algorithm (DR-PFA) for hybrid segmented crystal and fiber calorimeters, showing its potential to enhance jet reconstruction performance.

Findings

Jet energy resolution improved from 6.0% to 4.5% for 45 GeV jets.

Calorimeter achieves 3%/√E energy resolution for photons.

Calorimeter achieves 26%/√E energy resolution for neutral hadrons.

Abstract

In the reconstruction of physics events at future e$^+$e$^-$ colliders the calorimeter design has a crucial role in the overall detector performance. The reconstruction of events with many jets in their final state sets stringent requirements on the jet energy and angular resolutions. The energy resolution for jets with energy of about 45 GeV is required to be at the 4-5\% level to enable an efficient separation of the W and Z boson invariant masses. We demonstrate in this paper how such a performance can be achieved by exploiting a particle flow algorithm tailored for a hybrid dual-readout calorimeter made of segmented crystals and fibers. The excellent energy resolution and linearity of such calorimeter for both photons and neutral hadrons ($3\%/\sqrt{E}$ and $26\%/\sqrt{E}$, respectively), inherent to the homogeneous crystals and dual-readout technological choices, provides a powerful handle for the development of a new approach for particle identification and jet reconstruction. While the dual-readout particle flow algorithm (DR-PFA) presented in this paper is at its early stage of development, it already demonstrates the potential of a hybrid dual-readout calorimeter for jet reconstruction by improving the jet energy resolution with respect to a calorimeter-only reconstruction from 6.0\% to about 4.5\% for 45 GeV jets.