Speaker
Mrs
Iryna Schätti-Ozerianska
(Jagiellonian Univ)
Description
The eta meson production process can be studied via measurements of the analyzing power, Ay,
which may be understood as a measure of the relative deviation between the dierential cross
section with and without polarized beam. Spin-dependent observables such as cross sections and
analyzing powers have been determined only for a small number of excess energies and with very
high statistical uncertainty. Therefore, measurements of the reaction ~pp ! pp was performed at
the WASA-at-COSY detector in a xed-target experiment with beam momenta of 2026 MeV/c
and 2188 MeV/c. These correspond to excess energies of 15 MeV and 72 MeV, respectively. The
meson was identied by the techniques of missing mass and invariant mass. The invariant
mass technique was mainly used to reduce background events, while the missing mass technique
provided accurate kinematics of the meson.
The experimental angular distribution of the analyzing power will be compared to the theoretical
predictions and they will be interpreted in view of the contribution of higher partial waves.
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Primary author
Mrs
Iryna Schätti-Ozerianska
(Jagiellonian Univ)
