Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5494992 | Physics Letters B | 2017 | 6 Pages |
Abstract
ηNNN and ηNNNN bound states are explored in stochastic variational method (SVM) calculations within a pionless effective field theory (EFT) approach at leading order. The theoretical input consists of regulated NN and NNN contact terms, and a regulated energy dependent ηN contact term derived from coupled-channel models of the Nâ(1535) nucleon resonance. A self consistency procedure is applied to deal with the energy dependence of the ηN subthreshold input, resulting in a weak dependence of the calculated η-nuclear binding energies on the EFT regulator. It is found, in terms of the ηN scattering length aηN, that the onset of binding ηâ3He requires a minimal value of ReaηN close to 1 fm, yielding then a few MeV η binding in ηâ4He. The onset of binding ηâ4He requires a lower value of ReaηN, but exceeding 0.7 fm.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
N. Barnea, B. Bazak, E. Friedman, A. Gal,