23-27 May 2022
Hotel & Spa Mediterranean Village, Paralia (Pieria, Greece)
Europe/Athens timezone

Production and decays of hyperons in p+p reactions measured with HADES

24 May 2022, 16:00
20m
Hotel & Spa Mediterranean Village, Paralia (Pieria, Greece)

Hotel & Spa Mediterranean Village, Paralia (Pieria, Greece)

Speaker

Konrad Sumara (Jagiellonian University)

Description

The exact structure and inner workings of nucleons are debated, since the existence of quarks was postulated. Since then, a lot of experimental evidence has been gathered, indicating that nucleons and their excited states are not simple static quark states but are significantly influenced by the dynamics of baryon-meson interactions. In this context it is interesting to extend studies to hyperons where one light quark in a nucleon is replaced by a heavier strange quark, e.g. Σ-(1385) or excited Λ(1520), Λ(1405) states. Many models controversially describe the internal structure of these hyperons, including those based on the dynamical state generation. In order to determine which of the models are close to nature, it is helpful to measure radiative decays (with emission of a photon or e+e- pairs) and hadronic decays, e.g. Λ (1520)->Σ-(1385) π+ , Λ(1405)->Σ π. These decays are largely unexplored at present and are the motivation for the project presented in this talk. The goal of this project is to study the production of Sigma Σ- (1385) and Lambda Λ (1520), Λ(1405) hyperons produced in proton-proton at beam energies ranging from 3.5 GeV to 4.5 GeV with HADES detector at FAIR [1]. The analysis performed on data obtained from p + p at 3.5 GeV and first look into newly collected data from measurements in February 2022 will be presented. [1] J. Adamczewski-Musch et. al. (HADES Collaboration); Production and electromagnetic decay of hyperons: a feasibility study with HADES as a phase-0 experiment at FAIR; Eur. Phys. J. A (2021) 57: 138

Presentation Materials