A Catalogue of All Detected and Simulated Events in the ATLAS Experiment at CERN Compiled
An important achievement of the ATLAS team at JINR was the publication of the results of the EventIndex project being performed with an active participation of our colleagues from MLIT under the guidance of I. Alexandrov and headed on behalf of JINR by a senior DLNP researcher F. Prokoshin. The ATLAS EventIndex system is a catalogue of all events collected, processed or generated by the ATLAS experiment at the CERN LHC accelerator and comprises all associated software tools to collect, store and query this information. Every year of operation, ATLAS records several billions of particle interactions, processes them for the further analysis and generates even larger simulated data samples. A global catalogue is needed to keep track of the location of each event record and be able to search for and retrieve specific events during in-depth investigations. Also, it allows monitoring integrity and consistency of data samples, selecting events according to trigger solutions and examining their correlations. Each EventIndex record includes summary information on the event itself and the pointers to the files containing the full event. Most components of the EventIndex system are implemented using BigData free and open-source software. It is worth noting that JINR scientists have made a significant contribution to the development of this system and at present, the obtained experience is being implemented in the NICA project.
Global architecture of the EventIndex system implemented at the end of LHC Run 2
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