Export citation

Export citation

Choose format for download:

Download Citation
  • Access by Xinjiang University

"Recoil Effects" in a Model of Higher Baryon Couplings. I. Photoproduction

Rashmi Mehrotra and A. N. Mitra

  • Department of Physics and Astrophysics, University of Delhi, Delhi-7, India

Phys. Rev. D 4, 1409 – Published 1 September, 1971

DOI: https://doi.org/10.1103/PhysRevD.4.1409

Abstract

A recently proposed model (MM) of higher baryon couplings for P and V mesons is reformulated by reviewing the fuller possibilities of the "recoil term" in the primitive quark-meson interaction. While this introduces no basic change in the P-meson coupling structures, it yields an entirely new (L1)-wave coupling of V mesons to J=L+12 baryons, which is capable of generating helicity-flip amplitudes. The advantage of this new coupling structure over the earlier one is demonstrated through the excellent reproduction of (i) the E1 angular distribution in Y*Λγ decay and (ii) the appreciable magnitudes as well as energy variations of the asymmetry parameter Σ(θ) in pion photoproduction. In addition to a comparison of the two coupling structures (old and new), the present paper is also designed to study the role of still another parametric structure for the form factor - one which exhibits better convergence properties at higher energies than those discussed in MM. The additional processes studied in this connection are (i) η and X0 photoproduction at intermediate energies (> 2 GeV), (ii) polarization of the recoil proton in η and π photoproduction, and (iii) π0 photoproduction at high energies (∼ 6 GeV), in accordance with our earlier scheme of s-channel resonances. In connection with η photoproduction the roles of some pertinent I=12 resonances such as S11, P11, and G17 are discussed, especially in relation to supermultiplet assignments.

References (58)

  1. A. N. Mitra, Nuovo Cimento 61A, 344 (1969) ibid.64A, 603 (1969)
  2. A. N. Mitra, in Lectures in High-Energy Theoretical Physics, edited by H. H. Aly (Gordon and Breach, London, 1970)
  3. A. N. Mitra, Nuovo Cimento 56A, 1164 (1968)
  4. A. N. Mitra, Ann. Phys. (N.Y.) (to be published)
  5. D. K. Choudhury, D. L. Katyal, and A. N. Mitra, Lett. Nuovo Cimento (to be published)
  6. J. Schwinger, Phys. Rev. Letters 18, 923 (1967) R. Dashen, Phys. Rev. 183, 1245 (1969)
  7. R. Mehrotra and A. N. Mitra, Phys. Rev. D (to be published)
  8. K. Sen Gupta and V. K. Gupta, Phys. Rev. D (to be published)
  9. T. S. Mast, M. Alston-Garnjost, R. O. Bangerter, A. Barbaro-Galtieri, L. K. Gershwin, F. T. Solmitz, and R. D. Tripp, Phys. Rev. Letters 21, 1715 (1968)
  10. A. N. Mitra and M. H. Ross, Phys. Rev. 158, 1630 (1967)
  11. F. N. Dikmen, Phys. Rev. Letters 18, 798 (1967)
  12. V. Barger and D. Cline, Phys. Rev. 155, 1792 (1967)
  13. P. W. Coulter, Ernest S. Ma, and G. L. Shaw, Phys. Rev. Letters 23, 106 (1969)
  14. R. Dolen, D. Horn, and C. Schmid, Phys. Rev. 166, 1768 (1968) C. Schmid, Phys. Rev. Letters 20, 628 (1968)
  15. D. L. Katyal and A. N. Mitra, Phys. Rev. D 1, 338 (1970)
  16. D. K. Choudhury and A. N. Mitra, Phys. Letters 32B, 619 (1970)
  17. J. J. Sakurai, Ann. Phys. (N.Y.) 11, 1 (1960)
  18. L. A. Copley, G. Karl, and E. Obryk, Nucl. Phys. B13, 303 (1969)
  19. Aachen-Berlin-Bonn-Hamburg-Heidelberg-München Collaboration, DESY Report No. 68/8 (unpublished)
  20. B. Delcourt, J. Lefranscois, J. P. Perez-Y-Jorba, G. Sauvage, and G. Mennessier, Phys. Letters 29B, 75 (1969)
  21. C. Bacci, R-Baldino-Celio, C. Mencuccini, A. Reale, M. Spinetti, and A. Zallo, Phys. Rev. Letters 20, 571 (1968)
  22. E. D. Bloom, C. A. Heusch, C. Y. Prescott, and L. S. Rochester, Phys. Rev. Letters 21, 1100 (1968)
  23. C. A. Heusch, C. Y. Prescott, E. D. Bloom, and L. S. Rochester, Phys. Rev. Letters 17, 573 (1966)
  24. P. S. L. Booth, M. F. Butler, L. J. Caroll, J. R. Holt, J. N. Jackson, W. H. Range, N. R. S. Tait, E. G. H. Williams, and J. R. Wormald, Lett. Nuovo Cimento 2, 66 (1969)
  25. R. Prepost, D. Lundquist, and D. Quinn, Phys. Rev. Letters 18, 82 (1967)
  26. C. Bacci, G. Penso, G. Salvini, C. Mencuccini, and V. Silvestrini, Nuovo Cimento 45A, 938 (1966) Phys. Rev. Letters 16, 157 (1966) ibid.16, 384(E) (1966)
  27. C. A. Heusch, C. Y. Prescott, L. S. Rochester, and B. D. Winstein, Phys. Rev. Letters 25, 1381 (1970)
  28. R. H. Dalitz and D. G. Sutherland, Nuovo Cimento 37, 1777 (1965) J. J. J. Kokkedee, in The Quark Model (Benjamin, New York, 1969)
  29. Particle Data Group, Rev. Mod. Phys. 42, 87 (1970)
  30. D. Faiman and A. W. Hendry, Phys. Rev. 180, 1572 (1969)
  31. R. G. Moorhouse, Phys. Rev. Letters 16, 772 (1966)
  32. C. A. Heusch and F. Ravndal, Phys. Rev. Letters 25, 253 (1970)
  33. O. W. Greenberg, Rapporteur's talk in Proceedings of the Lund International Conference on Elementary Particles, edited by G. von Dardel (Berlingska Lund, Sweden, 1970)
  34. R. P. Feynman, S. Pakvasa, and S. F. Tuan, Phys. Rev. D 2, 1267 (1970)
  35. [15]
  36. R. H. Dalitz, in Proceedings of the Irvine Conference on πN Scattering, Irvine, California, 1967 (unpublished)
  37. D. E. Lundquist, R. L. Anderson, J. V. Allaby, and D. M. Ritson, Phys. Rev. 168, 1527 (1968)
  38. K. H. Althoff, D. Finken, N. Minatti, H. Piel, D. Trines, and M. Unger, in Proceedings of the Third International Symposium on Electron and Photon Interactions at High Energies, Stanford Linear Accelerator Center, Stanford, California, 1967 (Clearing House of Federal Scientific and Technical Information, Washington, D. C., 1968), p. 593
  39. R. Querzoli, G. Salvini, and A. Silverman, Nuovo Cimento 19, 53 (1961)
  40. L. Bertanza, P. Franzini, I. Mannelli, and G. V. Silvestrini, Nuovo Cimento 19, 953 (1961)
  41. J. O. Maloy, G. A. Salandin, A. Manfredini, V. Z. Peterson, J. I. Friedman, and H. Kendall, Phys. Rev. 122, 1338 (1961)
  42. P. C. Stein, Phys. Rev. Letters 2, 473 (1959)
  43. E. Bloom, C. Heusch, C. Prescott, and L. Rochester, Phys. Rev. Letters 19, 671 (1967)
  44. R. L. Walker, Phys. Rev. 182, 1729 (1969)
  45. F. F. Liu and S. Vitale, Phys. Rev. 144, 1093 (1966)
  46. R. C. Smith and R. F. Mozley, Phys. Rev. 130, 2429 (1963)
  47. P. Gorenstein, M. Grilli, F. Soso, P. Skillantini, M. Nigro, E. Schiavuta, and V. Valente, Phys. Letters 23, 394 (1966)
  48. R. E. Taylor and R. F. Mozley, Phys. Rev. 117, 835 (1960)
  49. D. J. Drickey and Robert F. Mozley, Phys. Rev. 136, B543 (1964) Phys. Rev. Letters 8, 291 (1962)
  50. G. Barbiellini, G. Bologana, G. Capon, G. DeZorzi, F. L. Fabbri, G. P. Murtas, G. Diambrini, G. Sette, and J. DeWire, Phys. Rev. 184, 1402 (1969)
  51. G. Buschhorn, P. Heide, V. Kotz, R. A. Lewis, P. Schmuser, and H. J. Skronn, Phys. Rev. Letters 20, 230 (1968)
  52. M. Croissiaux, E. B. Dally, R. Morand, J. P. Pahin, and W. Schmidt, Phys. Rev. 164, 1623 (1967)
  53. [R. Blankenbecler and R. L. Sugar, Phys. Rev. 168, 1597 (1968)]
  54. R. P. Bajpai and A. Donnachie, Nucl. Phys. B12, 274 (1969)
  55. S. R. Deans and W. G. Holladay, Phys. Rev. 161, 1466 (1967) ibid.165, 1886 (1968)
  56. S. K. Srinavasan, P. Achutan, and R. N. Sakrar, Nuovo Cimento 59A, 171 (1969)
  57. Y. C. Chau, N. Dombey, and R. G. Moorhouse, Phys. Rev. 163, 1632 (1967)
  58. S. A. S. Ahmed, Delhi University report (unpublished)

Outline

Information

Sign In to Your Journals Account

Filter

Filter

Article Lookup

Enter a citation