Angular Reconstruction of a Lead Scintillating-Fiber Sandwiched Electromagnetic Calorimeter

TL;DR

This paper introduces the NCDER method for precise angular reconstruction in a 3D electromagnetic calorimeter, demonstrating significantly improved resolution over traditional methods and potential applicability to various calorimeter types.

Contribution

The paper presents a novel NCDER method for angular reconstruction that outperforms the standard COG method and can be applied to different fine grain sampling calorimeters.

Findings

Achieved an angular resolution of 7.36 degrees at 1 GeV.

NCDER outperforms the COG method in resolution.

Applicable to various electromagnetic calorimeters.

Abstract

A new method called Neighbor Cell Deposited Energy Ratio (NCDER) is proposed to reconstruct incidence position in a single layer for a 3-dimensional imaging electromagnetic calorimeter (ECAL).This method was applied to reconstruct the ECAL test beam data for the Alpha Magnetic Spectrometer-02 (AMS-02). The results show that this method can achieve an angular resolution of 7.36\pm 0.08 / \sqrt(E) \oplus 0.28 \pm 0.02 degree in the determination of the photons direction, which is much more precise than that obtained with the commonly-adopted Center of Gravity(COG) method (8.4 \pm 0.1 /sqrt(E) \oplus 0.8\pm0.3 degree). Furthermore, since it uses only the properties of electromagnetic showers, this new method could also be used for other type of fine grain sampling calorimeters.