# First Measurement of the $\Sigma$ Beam Asymmetry in $\eta^{\prime}$ Photoproduction off the Proton near Threshold

Abstract : The $\Sigma$ beam asymmetry in $\eta^{\prime}$ photoproduction off the proton was measured at the GrAAL polarized photon beam with incoming photon energies of 1.461 and 1.480 GeV. For both energies the asymmetry as a function of the meson emission angle shows a clear structure, more pronounced at the lowest one, with a change of sign around 90$^o$. The results are compared to the existing theories that fail to account for the data.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-01053892
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Submitted on : Monday, August 4, 2014 - 9:20:45 AM
Last modification on : Thursday, November 19, 2020 - 12:59:12 PM

### Citation

P. Levi Sandri, G. Mandaglio, V. de Leo, O. Bartalini, V. Bellini, et al.. First Measurement of the $\Sigma$ Beam Asymmetry in $\eta^{\prime}$ Photoproduction off the Proton near Threshold. European Physical Journal A, EDP Sciences, 2015, pp.51:77. ⟨10.1140/epja/i2015-15077-0⟩. ⟨in2p3-01053892⟩

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