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The dynamics of $\eta$-meson production and the interaction of $\eta$-mesonswith nucleons can be studied using the $\vec{p}p\to pp\eta$ reaction viameasurements of the analyzing power $A_{y}$. To this end, we have performed ameasurement of the $\vec{p}p\to pp\eta$ reaction using the  WASA-at-COSY detector, which provides large acceptance and is$\varphi$-symmetric. The experiment was carried out for beam momenta of $2026$MeV/c and $2188$ MeV/c. In this article we present a method and results for thedetermination of the degree of the beam polarization.

Determination of the polarization in the $\vec{p}p\to pp$ reaction with WASA-at-COSY detector