强子物理在线论坛 Hadron Physics Online Forum (HAPOF)
第四十九届HAPOF论坛，Effective field theories meet lattice: two- and three-particle scattering， Prof. Akaki Rusetsky, 2022年05月20日
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Asia/Shanghai
Description
报告人：Prof. Akaki Rusetsky (University of Bonn) 报告时间：2022年05月20日 15：00 - 16：30 (Beijing time) 摘要： Lattice calculations are carried out in the Euclidean space and in a finite volume. Hence, a direct calculation of the scattering observables (S-matrix elements) is not possible, as manifested in the Maiani-Testa no-go theorem. The effective field theories provide a systematic framework that allows one to circumvent the restrictions arising from this theorem. In particular, in the two-particle sector, the Lüscher equation emerges that has become a standard tool for the extraction of the scattering phase shift from the computed energy spectrum on the lattice. A similar effective field theory framework can be formulated in the three-particle sector, and a systematic procedure for the extraction of the observables can be set up. In my talk, I shall mainly focus on the latest results in the three-particle sector, namely, on a fully relativistic-invariant formulation of the three-particle quantization condition and the extraction of the three-particle decay amplitude from lattice data. 报告人简介： Akaki Rusetsky is a researcher at the Helmholtz Institute for the Radiation and Nuclear Physics, University of Bonn. Previously, he worked at the High Energy Physics Institute of Tbilisi State University (Georgia), Joint Institute for Nuclear Research in Dubna (Russia), the Institute of Theoretical Physics, University of Bern (Switzerland) and ECT*, Trento (Italy). Akaki Rusetsky's activities are heavily focused on the use of the effective field theory methods in different areas of particle physics, ranging from hadronic atoms to the applications in lattice QCD.