Improving the spatial resolution of NICA/MPD ECAL with new reconstruction methods

A Shashlyk-type electromagnetic calorimeter(ECal) will be used in the Multi-purpose Detector at Nuclotron-based Ion Collider facility to study the properties of nuclear matter. In this experiment, the ECal detector is responsible for measuring the energy and position of the incident particles, and identifying them with the information obtained from itself and other detectors. This paper analyzes the position resolution of the Tsinghua ECal modules using the data from a beam test in DESY. Several reconstruction methods are studied in detail. With a deep learning based algorithm, the position resolution of the prototypes achieves less than 3.8 mm for 1.6 GeV electron beam, which is improved by about 30% compared to that of traditional charge center of gravity method.