Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2000-11-30
Phys.Lett.B528:215-220,2002
Physics
High Energy Physics
High Energy Physics - Experiment
10 pages, 5 figures, submitted to Phys. Letters B. Typos corrected. Some more information on the S11(1535) parameters
Scientific paper
10.1016/S0370-2693(02)01196-6
The differential cross section for the reaction p(gamma, eta p) has been measured from threshold to 1100 MeV photon laboratory energy. For the first time, the region of the S11(1535) resonance is fully covered in a photoproduction experiment and allows a precise extraction of its parameters at the photon point. Above 1000 MeV, S-wave dominance vanishes while a P-wave contribution is observed whose nature will have to be clarified. These high precision data together with the already measured beam asymmetry data will provide stringent constraints on the extraction of new couplings of baryon resonances to the eta meson.
Anghinolfi Marco
Bartalini O.
Bellini Valerio
Bocquet J.-P.
Capogni M.
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