Event Metadata System for the BM@N Experiment: First Use with Experimental Data

The Event Metadata System (EMS) of the BM@N experiment is an important part of its software ecosystem. The latest version of the EMS ensuring necessary core functions has been recently deployed in the JINR infrastructure. The Event Catalogue of the EMS has been filled with nearly 700M events collected by BM@N during its first physics run completed in February, 2023. In the paper the recent improvements of the EMS, its use for experiment data processing, and its integration with other software, including the BmnRoot software package, condition database of the experiment, and event visualization tool, are discussed.