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pi N --> eta N and eta N --> eta N partial wave T-matrices in a coupled, three channel model | | Mijo Batinic
; Ivo Slaus
; Alfred Svarc
; B.M.K. Nefkens
; | | Date: |
16 Dec 1994 | | Journal: | Phys.Rev. C51 (1995) 2310-2325; Erratum-ibid. C57 (1998) 1004-1005 | | Subject: | nucl-th hep-ph | | Abstract: | The pi N --> eta N and eta N --> eta N partial wave T-matrices for the eight lowest partial waves have been obtained in a three coupled channel model with unitarity manifestly imposed. The two physical channels are pi_N and eta_N, and the third channel, pi_pi_N is an effective, but unphysical two body channel which represents all remaining processes. The pi_N elastic phase shifts and the weighted data base of the pi- p --> eta n total and differential cross sections are chosen as the input for the fitting procedure. A model containing a single resonance in each of the three partial waves that dominates the eta production at lower energies is compared with previous analyses, based on similar assumptions. A multiresonance coupled channel model is introduced which significantly improves the agreement with all input data. Our results are compared with a complementary multiresonance coupled channel analysis that is constrained with elastic and continuum production channels. The inclusion of the fourth P11 resonance in the 1440 - 2200 MeV region further improves the agreement between the analysis and the data. | | Source: | arXiv, nucl-th/9501011 | | Services: | Forum | Review | PDF | Favorites | |
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