Pion-exchange currents in photoproduction of baryon resonances
โ Scribed by D. Robson
- Book ID
- 107983705
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 525 KB
- Volume
- 560
- Category
- Article
- ISSN
- 0375-9474
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๐ SIMILAR VOLUMES
Photocouplings for the nucleon resonances most relevant to total photoabsorption are calculated in a constituent quark model including gluon and pion exchange. The sensitivity of the results to the different ingredients of the model is discussed.
Within a quark model the process yp ~ rip, for E~ ab < 1.2 GeV, is investigated. We find that the recent data from GRAAL on the polarized beam asymmetry require significant contributions from the resonances Di3(1520), Fj5(1680), and to a lesser extent from P~3(1720) in addition to those from the dom
A self-consistent analysis of pion scattering and pion photoproduction within a coupled channels dynamical model is presented. In the case of pion photoproduction, we obtain background contributions to the imaginary part of the S-wave multipole which differ considerably from the result based on the