München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 25: Hadron Structure and Spectroscopy IV
HK 25.6: Talk
Tuesday, March 19, 2019, 18:00–18:15, HS 13
Status of the analysis for the search of polarization in the antiproton production process — •Dominika Alfs, Dieter Grzonka, and James Ritman — Institut für Kernphysik, Forschungszentrum Jülich, Germany
The goal of the P-349 experiment is to measure the polarization of antiprotons produced in pA collisions. Experimentally this is done by the measurement of the left-right asymmetry of elastic antiproton scattering on a liquid hydrogen target in the Coulomb-nuclear interference region.
According to preliminary calculations, the maximum of the analyzing power Ay, equal to about -4.5%, is reached for a four-momentum transfer | t | ≃ 0.003 GeV/c which corresponds to a scattering angle in the laboratory frame in the range of 10 - 20 mrad. Therefore, the required track reconstruction precision expected to be sufficient for the asymmetry determination is equal to about 1 mrad.
The experiment was performed in the PS test beam East Area at CERN in 2014, 2015 and in 2018 with an improved detector setup. The data analysis is ongoing. Currently, the main goals are reaching the desired track reconstruction precision and elimination of the dominant pionic background.
In this contribution the current status of the analysis will be presented with a focus on track identification and reconstruction and Monte Carlo supported particle identification with DIRC.