Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/10878
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | Soft-core hyperon-nucleon potentials |
Author: | Rijken, Th. A. Stoks, V. G. J. Yamamoto, Y. |
Citation: | Physical Review C, 1999; 59(1):21-40 |
Publisher: | American Physical Society |
Issue Date: | 1999 |
ISSN: | 0556-2813 |
School/Discipline: | School of Chemistry and Physics : Physics and Mathematical Physics |
Statement of Responsibility: | Th. A. Rijken; V. G. J. Stoks; Y. Yamamoto |
Abstract: | A new Nijmegen soft-core OBE potential model is presented for the low-energy YN interactions. Besides the results for the fit to the scattering data, which largely defines the model, we also present some applications to hypernuclear systems using the G-matrix method. The potentials are generated by the exchange of nonets of pseudoscalar, vector, and scalar mesons. As is standard in the Nijmegen soft-core models, we also include the J=0 contributions from the tensor f2,f2′,a2, and pomeron Regge trajectories, and use Gaussian form factors to guarantee that the potentials have a soft behavior near the origin. An important innovation with respect to the original soft-core potential is the assignment of the cutoff masses for the baryon-baryon-meson (BBM) vertices in accordance with broken SU(3)F, which serves to connect the NN and the YN channels. As a novel feature, we allow for medium strong breaking of the coupling constants, using the 3P0 model with a Gell-Mann–Okubo hypercharge breaking for the BBM coupling. Charge-symmetry breaking in the Λp and Λn channels is included as well. We present six hyperon-nucleon potentials which describe the available YN cross section data equally well, but which exhibit some differences on a more detailed level. The differences are constructed such that the models encompass a range of scattering lengths in the ΣN and ΛN channels. In all cases, we obtained χ2/Ndata≈0.55 for 35 YN data. In particular, we were able to fit the precise experimental datum rR=0.468±0.010 for the inelastic capture ratio at rest. For the scalar-meson mixing angle we obtained values θS=37°–40°, which points to almost ideal mixing angles for the scalar qq̅ states. The G-matrix results indicate that the remarkably different spin-spin terms of the six potentials appear specifically in the energy spectra of Λ hypernuclei. |
Rights: | © 1999 The American Physical Society |
DOI: | 10.1103/PhysRevC.59.21 |
Appears in Collections: | Special Research Centre for the Subatomic Structure of Matter publications |
Files in This Item:
File | Size | Format | |
---|---|---|---|
hdl_10878.pdf | 270.76 kB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.