Month: 2025-09 – Key feature delivered: Dielectron production modeling in OO collisions with Pythia integrated into the O2DPG framework. The feature adds a new parameter for dielectron production in OO collisions using Pythia, updates decay tables, and includes a dedicated INI configuration file for the event generator cocktail, along with a validation test to ensure setup correctness. Implemented to support more accurate dielectron decay simulations in OO events.

August 2025 focused on delivering end-to-end improvements to MC prediction workflows and multi-energy MC configuration across O2Physics and O2DPG. In O2Physics, we added a new Particle Prediction Task to generate meson-spectra predictions from offline simulations, complete with a CMake-based workflow and histogram processing for pi0, eta, eta', rho, omega, and phi, plus primary-particle filtering and rapidity-based MC coordinates. A bug fix adjusted initialization to InitContext& and corrected eta-based filtering to ensure consistent predictions. In O2DPG, we introduced configurable Pythia8 setups to run MC events at 5.02, 5.36, and 7.0 TeV, with dedicated beam properties, energies, and decay limits to accelerate cross-energy analyses. These changes collectively improve prediction accuracy, reproducibility, and research throughput, enabling faster validation of physics analyses and detector performance.