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
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