Seminar

Seminar program:

1. Evgeny Alexandrov

   The Event Picking Service

   Abstract:

   The ATLAS EventIndex is a complete catalog of all real and simulated ATLAS events, containing links to all persistent files containing a given event at any stage of processing. The primary use case for the ATLAS EventIndex is searching for one or more events among the billions of events generated by the ATLAS experiment, stored in several million files. The Event Picking Service (EPS), part of the ATLAS EventIndex, was designed to automate the mass collection of user-selected events from the ATLAS dataset and reprocess them using advanced algorithms or storing additional parameters that can assist subsequent analysis steps. The first version of the service was launched in 2021. Its flexible structure allows for modernization by adding and modifying the workflow in response to user feedback and new requirements from external system experts. The service's results have been used by several physics groups, and its user base is growing.

2. Khmelev Alexander

   Modeling of bound states in non-local QCD at finite temperature and density

   Abstract:

   We study the meson properties in the framework of an effective quark model. Starting from the Bethe-Salpeter equation we explore the interaction kernel in the nonlocal form with the Gaussian meson vertex function, characterized by a meson size parameter ΛH. We demonstrate the model’s predictive power by applying it to both light and heavy systems. We show that calculations of the π⁰→γγ decay width and the pion transition form factor F_πγ(Q²) reproduce experimental data from the low to high Q². We further predict the electromagnetic properties of heavy quarkonia, obtaining the two-photon decay widths of η_c and η_b and the radiative decay widths of the heavy bound states J/ψ and Υ, which consistency with available experimental data and other theoretical approaches. The model provides a computationally efficient and unified framework for describing mesons from the light to thr heavy quark sectors. A generalization is considered for the case of J/ψ production in a reaction gg→ J/ψg.

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