The {pi}{sup -}p{yields}{eta}n reaction at low energies in a chiral constituent quark model
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)
- Laboratoire de recherche sur les lois fondamentales de l'Univers, DAPNIA/SPhN, CEA/Saclay, F-91191 Gif-sur-Yvette (France)
A chiral quark-model approach is extended to the study of the {pi}N scattering at low energies. The process of {pi}{sup -}p{yields}{eta}n near threshold is investigated. The model is successful in describing the differential cross sections and total cross section near the {eta} production threshold. The roles of the resonances in n{<=}2 shells are clarified. Near threshold, the S{sub 11}(1535) dominates the reactions, whereas the interferences from the S{sub 11}(1650) turn out to be destructive around W < or approx. 1.6 GeV. The D{sub 13}(1520) is crucial to give correct shapes of the differential cross sections. The nucleon pole term contributions are significant. The P{sub 11}(1710) plays an important role around the center-of-mass energy W=1.7 GeV, it is crucial to produce an enhancement in the region of W>1.6 GeV as suggested by the data for total cross section. The t-channel is negligible in the reactions.
- OSTI ID:
- 21068003
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 76, Issue 6; Other Information: DOI: 10.1103/PhysRevC.76.065205; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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