Pion photoproduction in the [Formula Presented] resonance region

Physical Review C - Nuclear Physics

Volumn 56, Issue 1, 1997, Pages 577-578

  Arndt, R A ^a   Strakovsky, I I ^a   Workman, R L ^a  

^a VIRGINIA POLYTECHNIC INSTITUTE AND STATE UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0039330081     PISSN: 05562813     EISSN: 1089490X     Source Type: Journal    
DOI: 10.1103/PhysRevC.56.577     Document Type: Article

References (15)

1. R.A. Arndt, I.I. Strakovsky, and R.L. Workman, Phys. Rev. C 53, 430 (1996)
2. M. MacCormick et al., Phys. Rev. C 53, 41 (1996)
3. J. Peise et al., Phys. Lett. B 384, 37 (1996)
4. R.L. Crawford and W.T. Morton, Nucl. Phys. B211, 1 (1983)
5. R.M. Davidson, N.C. Mukhopadhyay, and R.S. Wittman, Phys. Rev. D 43, 71 (1991)
6. These solutions can be viewed using SAID with a TELNET call to clsaid.phys.vt.edu with userid: said, or through our WWW site at http://clsaid.phys.vt.edu.
7. R.L. Workman, R.A. Arndt, and Z. Li, Phys. Rev. C 46, 1546 (1992)
8. R.M. Barnett et al., Phys. Rev. D 54, 1 (1996)
9. M. Khandaker and A.M. Sandorfi, Phys. Rev. D 51, 3966 (1995)
10. A.M. Sandorfi (private communications).
11. R. Beck et al., Phys. Rev. Lett. 78, 606 (1997). There appears to be a typographical error in Eq. (4) of this paper. The signs of the (Formula presented) and (Formula presented) multipoles should be reversed
12. O. Hanstein, D. Drechsel, and L. Tiator, Phys. Lett. B 385, 45 (1996)
13. A number of our earlier solutions predict the Mainz data 11 with a (Formula presented)/data near unity. The solution SM95 6 actually gives a (Formula presented)/data of 168/182 for this data set. This explains why our result for the (Formula presented) ratio was not greatly influenced by the Mainz experiment.
14. We expect the ratio of pole residues to be less model dependent than the individual residues for (Formula presented) and (Formula presented). If one assumes a factorizable pole [see, for example, R.A. Arndt et al., Phys. Rev. C 42, 1864 (1990)], the pion-nucleon residue cancels in the ratio. In a representative fit with the ratio (modulus, phase) of (0.065, (Formula presented), we found (1.33, (Formula presented) and (20.5, (Formula presented) for the (Formula presented) and (Formula presented) residues, in the units (10(Formula presented)/m(Formula presented) of Ref. 12
15. L. Tiator has claimed a value of (Formula presented) for the (Formula presented) ratio at the resonance energy, using the amplitudes of Ref. 12. A comparison of the resonant and pole values from several sources was given during the N(Formula presented) meeting at INT, Seattle, 1996, edited by T.-S.H. Lee and W. Roberts (World Scientific, Singapore, in press).