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Mechanism of near-threshold production of the eta meson
R Czyzykiewicz1, P Moskal, H-H Adam
1Institute of Physics, Jagellonian University, 30-059 Cracow, Poland.
Abstract:
Measurements of the analyzing power for the pp-->pp eta reaction have been performed at excess energies of Q=10 and 36 MeV. The determined analyzing power is essentially consistent with zero, implying dominance of the s wave at both excess energies. The angular dependence of the analyzing power, combined with the isospin dependence of the total cross section for the eta meson production in nucleon-nucleon collisions, reveal that the excitation of the nucleon to the S11(1535) resonance is predominantly due to the exchange of the pi meson between the colliding nucleons.
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