Simulation study of BESIII with stitched CMOS pixel detector using acts

The reconstruction of the tracks of charged particles with high precision is crucial for HEP experiments to achieve their physics goals. The BESIII drift chamber, which is used as the tracking detector of the BESIII experiment, has suffered from aging effects resulting in degraded tracking performance after operation for approximately 15 years. To preserve and enhance the tracking performance of BESIII, one of the proposals is to add one layer of a thin cylindrical CMOS pixel sensor based on state-of-the-art stitching technology between the beam pipe and the drift chamber. The improvement in the tracking performance of BESIII with such an additional pixel detector compared to that with only the existing drift chamber was 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.