{eta} photoproduction of nucleons and the structure of the resonance {ital S}{sub 11}(1535) in the quark model

Journal Article · Wed Nov 01 04:00:00 EST 1995 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.52.4961· OSTI ID:118538

Li, Z ^[1]

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1. Physics Department, Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213-3890 (United States)

In this paper, we present our study on {eta} photoproduction based on the chiral quark model. We find that the quark model provides a very good description of {eta} production with far fewer parameters, and the threshold region is not a reliable source to determine the {eta}{ital NN} coupling constant due to its strong dependence on the properties of the resonance {ital S}{sub 11}(1535). We suggest that the systematic data in {ital E}{sub lab}=1.2--1.4 GeV region may help us to determine the {eta}{ital NN} coupling constant more precisely. The structure of the resonance {ital S}{sub 11}(1535) is discussed; we find that the recent data from Mainz group bring the helicity amplitude much closer to the quark model prediction. However, more studies need to be done to understand the large {eta}{ital N} branching ratio of the resonance {ital S}{sub 11}(1535). Our results show that the quark model is a very good approach to studying the underlying structure of baryon resonances from the meson photoproduction data.

• OSTI ID: 118538
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 9 Vol. 52; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BRANCHING RATIO
CHIRAL SYMMETRY
COUPLING CONSTANTS
ETA MESONS
N-1535 BARYONS
PHOTON-NUCLEON INTERACTIONS
PHOTOPRODUCTION
QUARK MODEL
RESONANCE