Export citation

Export citation

Choose format for download:

Download Citation
  • Access by Xinjiang University

Pion photoproduction in the Δ(1232) region and chiral bag models

G. Kälbermann and J. M. Eisenberg

  • Department of Physics and Astronomy, Tel Aviv University, 69978 Tel Aviv, Israel

Phys. Rev. D 28, 71 – Published 1 July, 1983

DOI: https://doi.org/10.1103/PhysRevD.28.71

Abstract

We calculate pion photoproduction near the Δ(1232) resonance using a version of the chiral bag model based on an effective Lagrangian that reproduces correct pion-nucleon phenomenology through third order in the pion field. The pionic corrections to the M1 (or M1+) amplitude are common to a broad class of chiral bag models and substantially improve agreement with experiment. We treat also the E2 (or E1+) multipole which is accessible in our approach since the effective Lagrangian induces quark-quark tensor coupling through pion exchange; this in turn permits the admixture of baryon components involving quark excitation to d states. The resulting E2 admixture is consistent with the rather loose bounds set by the present experimental information on this quantity. The present work neglects the tensor force and d state arising from gluon exchange between quarks.

References (26)

  1. A. Chodos, R. L. Jaffe, K. Johnson, C. B. Thorn, and V. F. Weisskopf, Phys. Rev. D 9, 3471 (1974)
  2. T. A. De Grand, R. L. Jaffe, K. Johnson, and J. Kiskis, Phys. Rev. D 12, 2060 (1975)
  3. A. Chodos and C. B. Thorn, Phys. Rev. D 12, 2733 (1975)
  4. R. L. Jaffe, in Pointlike Structure Inside and Outside Hadrons, proceedings of the 17th International School of Subnuclear Physics, Erice, 1979, edited by A. Zichichi (Plenum, New York, 1982)
  5. S. Théberge, A. W. Thomas, and G. A. Miller, Phys. Rev. D 22, 2838 (1980) ibid.23, 2106 (1981) A. W. Thomas, J. Phys. G 7, L283 (1981) Adv. Nucl. Phys. (to be published)
  6. C. E. De Tar, Phys. Rev. D 24, 752 (1981) ibid.24, 762 (1981)
  7. V. M. Vento, M. Rho, E. M. Nyman, J. H. Jun, and G. E. Brown, Nucl. Phys. A345, 413 (1980)
  8. G. Kälbermann and J. M. Eisenberg, preceding paper, Phys. Rev. D 28, 66 (1983)
  9. S. Weinberg, Phys. Rev. Lett. 18, 188 (1967)
  10. M. Gell-Mann and M. Levy, Nuovo Cimento 16, 705 (1960)
  11. V. Vento, G. Baym, and A. D. Jackson, Phys. Lett. 102B, 97 (1981)
  12. I. Hulthage, F. Myhrer, and Z. Xu, Nucl. Phys. A364, 322 (1981)
  13. S. A. Chin, Phys. Lett. 109B, 161 (1982)
  14. W. Pfeil and D. Schwela, Nucl. Phys. B45, 379 (1972)
  15. Yu. M. Alexandrov, V. F. Grushin, E. M. Leiken, and A. Ya. Rotvain, Nucl. Phys. B25, 589 (1972)
  16. P. Feller et al., Nucl. Phys. B104, 219 (1976)
  17. W. J. Metcalf and R. L. Walker, Nucl. Phys. B76, 253 (1974)
  18. F. A. Berends and A. Donnachie, Nucl. Phys. B136, 1317 (1978)
  19. F. A. Berends, A. Donnachie, and D. L. Weaver, Nucl. Phys. B4, 1 (1967) ibid.B4, 54 (1967)
  20. G. F. Chew, M. L. Goldberger, F. E. Low, and Y. Nambu, Phys. Rev. 106, 1345 (1957)
  21. A. Donnachie and G. Shaw, Nucl. Phys. 87, 556 (1967)
  22. P. Finkler, Phys. Rev. 159, 1377 (1968)
  23. D. Schwela and R. Weizel, Z. Phys. 221, 106 (1969)
  24. R. L. Crawford, Nucl. Phys. B28, 573 (1971)
  25. J. F. Donoghue, E. Golowich, and B. Holstein, Phys. Rev. D 12, 2875 (1975)
  26. Particle Data Group, Rev. Mod. Phys. 52, S1 (1980)

Outline

Information

Sign In to Your Journals Account

Filter

Filter

Article Lookup

Enter a citation