%0 Journal Article
%T eta '-Nucleus optical potential and possible eta ' bound states
%A Nagahiro, H.
%A Hirenzaki, S.
%A Oset, E.
%A Ramos, A.
%J Physics Letters B
%D 2012
%V 709
%N 1-2
%I Elsevier Science Bv
%@ 0370-2693
%G English
%F Nagahiro_etal2012
%O WOS:000302111200013
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=979), last updated on Tue, 08 May 2012 20:13:43 +0000
%X Starting from a recent model of the eta'N interaction, we evaluate the eta'-nucleus optical potential, including the contribution of lowest order in density, t rho/2m(eta'), together with the second-order terms accounting for eta' absorption by two nucleons. We also calculate the formation cross section of the eta' bound states from (pi(+), p) reactions on nuclei. The eta'-nucleus potential suffers from uncertainties tied to the poorly known eta'N interaction, which can be partially constrained by the experimental modulus of the eta'N scattering length and/or the recently measured transparency ratios in eta' nuclear photoproduction. Assuming an attractive interaction and taking the claimed experimental value vertical bar a(eta'N)vertical bar = 0.1 fm, we obtain an eta' optical potential in nuclear matter at saturation density of V eta' = -(8.7 + 1.8i) MeV, not attractive enough to produce eta' bound states in light nuclei. Larger values of the scattering length give rise to deeper optical potentials, with moderate enough imaginary parts. For a value vertical bar a(eta'N)vertical bar = 0.3 fm, which can still be considered to lie within the uncertainties of the experimental constraints, the spectra of light and medium nuclei show clear structures associated to eta'-nuclear bound states and to threshold enhancements in the unbound region.
%R 10.1016/j.physletb.2012.01.061
%U http://arxiv.org/abs/1111.5706
%U https://doi.org/10.1016/j.physletb.2012.01.061
%P 87-92