Evidence for a backward peak in the gamma+d->pi^0+d cross section near the eta threshold

Details Evidence for a backward peak in the gamma+d->pi^0+d cross section near the eta threshold Evidence for a backward peak in the gamma+d->pi^0+d cross section near the eta threshold

2007-03-05

arxiv.org/abs/nucl-ex/0703006v2

Eur.Phys.J.A43:261-267,2010

Physics

Nuclear Physics

Nuclear Experiment

slightly modified title, additional paragraph and a table (Table 2) added on p. 5; to be submitted to EPJA, 6 pages, 3 figures

Scientific paper

10.1140/epja/i2010-10918-x

High-quality cross sections for the reaction gamma+d->pi^0+d have been measured using the CLAS at Jefferson Lab over a wide energy range near and above the eta-meson photoproduction threshold. At backward c.m. angles for the outgoing pions, we observe a resonance-like structure near E_gamma=700 MeV. Our model analysis shows that it can be explained by eta excitation in the intermediate state. The effect is the result of the contribution of the N(1535)S_11 resonance to the amplitudes of the subprocesses occurring between the two nucleons and of a two-step process in which the excitation of an intermediate eta meson dominates.

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