# Measurement of $\Sigma$ beam asymmetry in $\pi^{0}$ photoproduction off the neutron in the second and third resonances region

Abstract : The $\Sigma$ beam asymmetry in the photoproduction of neutral pions from quasi-free nucleons in a deuteron target was measured for the first time between 0.60 and 1.50GeV, with the GRAAL polarized and tagged photon beam. The asymmetry values from the quasi-free proton were found equal to the ones extracted from a pure proton target. The asymmetries from quasi-free proton and quasi-free neutron were found equal up to 0.82GeV and substantially different at higher energies. The results are compared with recent partial-wave analyses.
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Journal articles
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http://hal.in2p3.fr/in2p3-00435376
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Submitted on : Tuesday, November 24, 2009 - 2:06:28 PM
Last modification on : Thursday, November 19, 2020 - 12:58:47 PM

### Citation

R. Di Salvo, A. Fantini, G. Mandaglio, F. Mammoliti, O. Bartalini, et al.. Measurement of $\Sigma$ beam asymmetry in $\pi^{0}$ photoproduction off the neutron in the second and third resonances region. European Physical Journal A, EDP Sciences, 2009, 42, pp.151-157. ⟨10.1140/epja/i2009-10870-x⟩. ⟨in2p3-00435376⟩

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