SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 68: Hadron Structure and Spectroscopy IX
HK 68.1: Gruppenbericht
Donnerstag, 23. März 2023, 15:45–16:15, SCH/A419
Exclusive Hyperon Reconstruction in pp Data at HADES — •Jenny Regina1 and Waleed Esmail2 — 1GSI, Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany — 2FZ Jülich
Hyperons are expected to play an important role in describing the dynamics of high-dense baryonic matter such as present in the interior of neutron stars. HADES (High Acceptance Di-Electron Spectrometer) offers excellent opportunities for studying hyperon production in pp and heavy ion collisions. In February 2022 HADES collected high statistics data of the reaction p(4.5 GeV)p. With this data set, the production and decay of single and double strange hyperons in inclusive and exclusive channels will be possible. In particular rare dielectron Dalitz decays of Σ0 and Λ hyperons will investigated for the first time.
For this purpose, HADES was upgraded with straw tube trackers, which are a FAIR-Phase0 contribution from PANDA, and a timing detector, both of which cover polar angles below 7 degrees; a region where many hyperon decay products are emitted. As a result, they increase the efficiency of the hyperon reconstruction. A kinematic fitting library has been developed to improve the overall resolution. It is based on Lagrange multipliers and utilizes kinematic and geometric constraints.
This talk will address the exclusive hyperon reconstruction, for example of pp→ pK+Λ, in the recent data, focusing on the new hyperon reconstruction tools; the straw tube tracker, the kinematic fitting, and how these are used in the analyses.