E2/M1 ratio of the {Delta}{leftrightarrow}{gamma}N transition within the chiral constituent quark model
- Institute of High Energy Physics, Academia Sinica, Beijing 100039 (China)
- China Center of Advanced Science and Technology (World Laboratory), Beijing 100080 (China)
- Institute of Theoretical Physics, Academia Sinica, Beijing 100080 (China)
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843 (United States)
The chiral constituent quark model is applied to predict the magnetic M1 and electric E2 amplitudes of the {Delta}{leftrightarrow}{gamma}N transition. It is found that the one-meson-exchange quark-quark potential due to the chiral fields enhances the E2/M1 ratio by a factor of about 2. The predicted M{sub 1{sup +}} amplitude and the E2/M1 ratio {approx_equal}{minus}1.0{percent} are within the range determined from a recent analysis of the data of pion photoproduction. {copyright} {ital 1997} {ital The American Physical Society}
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 543582
- Journal Information:
- Physical Review, C, Vol. 55, Issue 4; Other Information: PBD: Apr 1997
- Country of Publication:
- United States
- Language:
- English
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