Beam asymmetry $\Sigma$ measurements on the $\pi^-$ photoproduction off neutrons
G. Mandaglio, F. Mammoliti, M. Manganaro, V. Bellini, J. P. Bocquet,, L. Casano, A. D'Angelo, R. Di Salvo, A. Fantini, D. Franco, G. Gervino, F., Ghio, G. Giardina, B. Girolami, A. Giusa, A. Ignatov, A. Lapik, P. Levi, Sandri, A. Lleres, D. Moricciani, A. N. Mushkarenkov
TL;DR
This paper reports measurements of the beam asymmetry Sigma in negative pion photoproduction off neutrons, providing new experimental data in the 700-1500 MeV energy range to inform theoretical models.
Contribution
It presents the first measurement of Sigma asymmetry on neutrons in this energy range using polarized photons, filling a gap in experimental data.
Findings
Measured Sigma asymmetry across a wide angular range
Compared results with recent partial wave analyses
Provides data to improve theoretical models of pion photoproduction
Abstract
The beam asymmetry in the photoproduction of negative pions from quasi-free neutrons in a deuterium target was measured at Graal in the energy interval 700 - 1500 MeV and a wide angular range, using polarized and tagged photons. The results are compared with recent partial wave analyses.
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