Köln 2025 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 34: Hadron Structure and Spectroscopy IV
HK 34.5: Vortrag
Mittwoch, 12. März 2025, 18:30–18:45, HS 3 Physik
Investigating Proton-Proton Elastic Scattering 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
An experiment focused on hyperon production was carried out in 2022 with the upgraded HADES spectrometer. The upgrade includes a Forward Detector system (FD) consisting of two PANDA-type Straw Tracking Stations, and an RPC. The measurements were performed with a T = 4.5 GeV proton beam impinging onto a LH2 target.
Proton-proton elastic scattering events were selected based on kinematic observables, requiring that one proton was detected in the FD (θFD < 6∘) and the other proton within the main HADES acceptance (70∘<θH<79∘). These events, after corrections for acceptance and reconstruction efficiency, were used for the determination the time-integrated luminosity recorded during the experiment.
The measured differential cross-section dσ as a function of the square of the 4-momentum transfer t is well described by the function dσ/dt = dσ/dt|t=0· e−B|t|, enabling extraction of the optical point A=dσ/dt|t=0 and the nuclear slope parameter B. In this talk, the selection method for elastic scattering events will be explained in detail. Preliminary results for the integrated luminosity, as well as the parameters A and B, will be presented and compared to data from other experiments.
Keywords: HADES; pp Elastic Scattering; Luminosity; Cross-section; Forward Detector