https://doi.org/10.1051/epjconf/201613003010
Determination of the analysing power for the 
→ ppη reaction using the WASA-at-COSY detector system
Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University in Kraków, 30-348, Kraków, Poland
Published online: 29 November 2016
High statistics measurements of the analyzing power for the
→ ppη reaction were performed with the WASA-at-COSY detector at the Cooler Synchrotron COSY. The η meson was produced at two excess energies: Q = 15 MeV and Q = 72 MeV, and it was registered using the missing and invariant mass techniques. The determined analyzing power is consistent with zero for Q = 15 MeV implying the dominance of s wave and an insignificant contribution of the S d partial wave. However, at Q = 72 MeV the angular distribution of the analyzing power reveals a strong interference of Ps and Pp partial waves. Moreover, the available theoretical predictions for the angular dependence of the analyzing power strongly deviate from our experimental results.
© The Authors, published by EDP Sciences, 2016
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
