Speaker
Description
With the latest ROOT version (6.36), the RNTuple API is stable as well as its on-disk format: data written today will be readable with the future versions of ROOT. RNTuple is the successor of the TTree format, bringing many advantages such as faster read / write, type safety, use of modern smart pointers, suitability for parallelized hardware and asynchronous operations. SND@HL-LHC will be an upgraded version of the current SND@LHC experiment that will operate during the High Luminosity phase of LHC. As for other Run 4 experiments, using RNTuple seems like the most sound option.
The first step for SND@HL-LHC is dropping the usage of TClonesArray within its software in favor of an event data model based on STL containers, optimised for IO rate. Then, tuning the SND@HL-LHC software stack in order to work with RNTuple.