# Differential cross section measurement of $\eta$ photoproduction on the proton from threshold to 1100 MeV

Abstract : Measurement of the differential cross section for the reaction p(gamma, eta p) is presented from threshold to 1100 MeV photon laboratory energy. The experiment has been performed using the GRAAL facility in Grenoble. For the first time, the region of the S11(1535) is fully covered, allowing a precise extraction of its width. Above 900 MeV, s-wave dominance disappears while p and d-waves take over. A discussion about their origin is given, suggesting unexpected contribution from vector meson exchange or the need for "missing" resonances.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00010886
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Submitted on : Monday, March 4, 2002 - 4:17:39 PM
Last modification on : Thursday, November 19, 2020 - 12:58:35 PM

### Citation

F. Renard, M. Anghinolfi, O. Bartalini, V. Bellini, J.P. Bocquet, et al.. Differential cross section measurement of $\eta$ photoproduction on the proton from threshold to 1100 MeV. Physics Letters B, Elsevier, 2002, 528, pp.215-220. ⟨in2p3-00010886⟩

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