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HK: Fachverband Physik der Hadronen und Kerne
HK 47: Hadron Structure and Spectroscopy VI
HK 47.4: Talk
Wednesday, March 13, 2024, 16:45–17:00, HBR 62: EG 19
Luminosity Determination and Proton-Proton Elastic Scattering Analysis with the Upgraded HADES Spectrometer — •Gabriela Perez-Andrade1, James Ritman1,2,3, and Peter Wintz3 for the HADES collaboration — 1Ruhr Universität Bochum — 2GSI Helmholtzzentrum für Schwerionenforschung — 3Forschungszentrum Jülich
In 2022, an experiment focused on hyperon production was carried out with the upgraded HADES spectrometer. The upgrade includes a new Forward Detector system (FD), which consists of two PANDA-type Straw Tracking Stations and an RPC. The measurements were performed with a proton beam of T = 4.5 GeV impinging onto a LH2 target.
Proton-proton elastic scattering events with low 4-momentum transfer were selected by demanding that one proton was detected in the FD (θFD < 6∘), and the other proton was measured in the main HADES acceptance (70∘<θH<79∘). The event selection based on kinematic observables will be explained in this talk. The number of elastic events, corrected for acceptance and reconstruction efficiency, is used to determine the time-integrated luminosity recorded during this experiment. The measured differential cross-section dσ as a function of the square of the 4-momentum transfer t is well described by a function of the form dσ/dt = Ae−B|t|, from which the optical point A = dσ/dt|t=0 and the nuclear slope parameter B are obtained. Preliminary results of A and B are compared with existing data from other experiments.
Keywords: HADES Experiment; Hyperon; Luminosity; Cross-section