{pi}{ital N}{r_arrow}{eta}{ital N} and {eta}{ital N}{r_arrow}{eta}{ital N} partial-wave {ital T} matrices in a coupled, three-channel model
- Rudjer Boskovic Institute, 41001 Zagreb (Croatia)
- University of California Los Angeles, Los Angeles, California 90024 (United States)
The {pi}{ital N}{r_arrow}{eta}{ital N} and {eta}{ital N}{r_arrow}{eta}{ital N} partial-wave {ital 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}{ital N} and {eta}{ital N}, and the third channel, {pi}{pi}{ital N} is an effective, but unphysical two-body channel which represents all remaining processes. The {pi}{ital N} elastic phase shifts and the weighted data base of the {pi}{ital N}{r_arrow}{eta}{ital 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 {ital P}{sub 11} resonance in the 1440--2200 MeV region further improves the agreement between the analysis and the data.
- DOE Contract Number:
- FG03-88ER40420
- OSTI ID:
- 44669
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 5 Vol. 51; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
Similar Records
{eta}{ital N} {ital S}-wave scattering length in a three-coupled-channel, multiresonance, unitary model
Observation of the {eta}(1295) and {eta}(1440) produced in the reaction {pi}{sup {minus}}p{r_arrow}{eta}{pi}{sup +}{pi}{sup {minus}}n at 18 Gev/c