Higher Partial Waves in p+p->p+p+eta near Threshold
Abstract
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.
Keywords
Cite
@article{arxiv.nucl-ex/9811003,
title = {Higher Partial Waves in p+p->p+p+eta near Threshold},
author = {H. Calen and J. Dyring and G. Faldt and K. Fransson and L. Gustafsson and S. Haggstrom and B. Hoistad and J. Johanson and A. Johansson and T. Johansson and S. Kullander and A. Mortsell and R. Ruber and J. Zlomanczuk and C. Ekstrom and K. Kilian and W. Oelert and T. Sefzick and R. Bilger and W. Brodowski and H. Clement and G. J. Wagner and A. Bondar and A. Kuzmin and B. Shwartz and V. Sidorov and A. Sukhanov and V. Dunin and B. Morosov and A. Povtorejko and A. Sukhanov and A. Zernov and A. Kupsc and P. Marciniewski and J. Stepaniak and J. Zabierowski and A. Turowiecki and Z. Wilhelmi and C. Wilkin},
journal= {arXiv preprint arXiv:nucl-ex/9811003},
year = {2008}
}
Comments
16 pages, LaTeX2e, 3 EPS Figures, Updated version, Accepted for publication in Phys. Lett. B