Polarisation observables constitute a powerful tool for establishing the production mechanism of the η meson and for infering the presence of higher partial waves in the final system. Measurements of the proton analysing power for the p⃗p → ppη reaction have been performed by the COSY‐11 group at three different excess energies: Q=10, 37 and 40 MeV. Data at Q=40 MeV indicate that the η meson is probably produced in partial waves higher than s wave.
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© 2004 American Institute of Physics.
2004
American Institute of Physics
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