Abstract.
The \( \Sigma\) beam asymmetry in \( \eta^{\prime}\) photoproduction off the proton was measured at the GrAAL polarised photon beam with incoming photon energies of 1.461 and 1.480 GeV. For both energies the asymmetry as a function of the meson production angle shows a clear structure, more pronounced at the lowest one, with a change of sign around \( 90^{\circ}\). The observed behaviour is compatible with P-wave D-wave (or S-wave F-wave) interference, the closer to threshold the stronger. The results are compared to the existing state-of-the-art calculations that fail to account for the data.
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Levi Sandri, P., Mandaglio, G., De Leo, V. et al. First measurement of the \(\Sigma\) beam asymmetry in \(\eta^{\prime}\) photoproduction off the proton near threshold. Eur. Phys. J. A 51, 77 (2015). https://doi.org/10.1140/epja/i2015-15077-0
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DOI: https://doi.org/10.1140/epja/i2015-15077-0