Higher Partial Waves in p+p->p+p+eta near Threshold

Details Higher Partial Waves in p+p->p+p+eta near Threshold Higher Partial Waves in p+p->p+p+eta near Threshold

1998-11-05

arxiv.org/abs/nucl-ex/9811003v2

Phys.Lett.B458:190-196,1999

Physics

Nuclear Physics

Nuclear Experiment

16 pages, LaTeX2e, 3 EPS Figures, Updated version, Accepted for publication in Phys. Lett. B

Scientific paper

10.1016/S0370-2693(99)00613-9

Exclusive measurements of the production of eta mesons in the p+p->p+p+eta reaction have been carried out at excess energies of 16 and 37 MeV above threshold. The deviations from phase space are dominated by the proton-proton final state interaction and this influences particularly the energy distribution of the eta meson. However, evidence is also presented at the higher energy for the existence of an anisotropy in the angular distributions of the eta meson and also of the final proton-proton pair, probably to be associated with D-waves in this system interfering with the dominant S-wave term. The sign of the eta angular anisotropy suggests that rho-exchange is important for this reaction.

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