Simulation study of BESIII with stitched CMOS pixel detector using ACTS

TL;DR

This paper evaluates the potential enhancement of BESIII's charged particle tracking by integrating a stitched CMOS pixel detector, using ACTS software to simulate and analyze the performance improvements.

Contribution

It introduces a novel detector upgrade proposal for BESIII and demonstrates its potential benefits through simulation with ACTS software.

Findings

Significant improvement in tracking accuracy with the added pixel detector.

Feasibility of integrating stitched CMOS sensors in BESIII.

Enhanced reconstruction efficiency demonstrated in simulations.

Abstract

Reconstruction of tracks of charged particles with high precision is very crucial for HEP experiments to achieve their physics goals. As the tracking detector of BESIII experiment, the BESIII drift chamber has suffered from aging effects resulting in degraded tracking performance after operation for about 15 years. To preserve and enhance the tracking performance of BESIII, one of the proposals is to add one layer of thin CMOS pixel sensor in cylindrical shape based on the state-of-the-art stitching technology, between the beam pipe and the drift chamber. The improvement of tracking performance of BESIII with such an additional pixel detector compared to that with only the existing drift chamber is studied using the modern common tracking software ACTS, which provides a set of detector-agnostic and highly performant tracking algorithms that have demonstrated promising performance for a few high energy physics and nuclear physics experiments.