Pions in the light-cone nucleon and electromagnetic form factors

  • N. N. Nikolaev
  • A. Szczurek
  • J. Speth
  • V. R. Zoller
Hadron Physics

Abstract

The light-cone Fock-state decomposition of the nucleon involves pion-quark core (π′N′ andπ′Δ′) components. The size of the quark core is at present of special importance for the analysis of the onset of colour transparency in the A(e,e′p) reactions. With the light-coneNπ′N′ andNπ′Δ′ vertex functions deduced from experimental data on high-energy proton fragmentation into nucleons and isobars, we evaluate the effect of the pionic cloud on the electromagnetic form factors of nucleons. We find the quark core radius to be about 10% smaller than the nucleon's radius. Analysis of the renormalization of the total nucleon-nucleon cross section for the presence of the pionic cloud suggests a similar core radius.

PACS

12.40.Aa 13.40.Fn 

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References

  1. 1.
    Amaudruz, P. et al.: Phys. Rev. Lett.66, 2712 (1991)Google Scholar
  2. 2.
    Henley, E.M., Miller, G.A.: Phys. Lett. B251, 453 (1990)Google Scholar
  3. 3.
    Kumano, S.: Phys. Rev. D43, 59 (1991)Google Scholar
  4. 4.
    Signal, A., Schreiber, A.W., Thomas, A.W.: Mod. Phys. Lett. A6, 271(1991)Google Scholar
  5. 5.
    Hwang, W-Y.P., Speth, J., Brown, G.E.: Z. Phys. A339, 383 (1991)Google Scholar
  6. 6.
    Zoller, V.R.: Z. Phys. C53, 443 (1992)Google Scholar
  7. 7.
    Szczurek, A., Speth, J.: Nucl. Phys. A555, 249 (1993)Google Scholar
  8. 8.
    Szczurek, A., Speth, J., Garvey, G.T.: Jülich Preprint KFAIKP(TH)-13 (1993) Nucl. Phys. A (in print)Google Scholar
  9. 9.
    Nikolaev, N.N., Szczurek, A., Speth, J., Wambach, J., Zakharov, B.G., Zoller, V.R.: (in preparation)Google Scholar
  10. 10.
    Umezawa, H., Takahashi, Y., Kamefuchi, S.: Phys. Rev.85, 505 (1952); Sachs, R.G.: Phys. Rev.87, 1100 (1952); Fried, B.D.: Phys. Rev.88, 1142 (1952); Friedman, M.H.: Phys. Rev.97, 1123 (1955); Miyazawa, H.: Phys. Rev.101, 1564 (1956)Google Scholar
  11. 11.
    Dziembowski, Z., Mankiewicz, L.: Phys. Rev. D36, 1556 (1987)Google Scholar
  12. 12.
    Holtmann, H., Szczurek, A., Speth, J.: (in preparation)Google Scholar
  13. 13.
    Boreskov, K.G., Arakelyan, G.G.: Sov. J. Nucl. Phys.31, 1578 (1980); Arakelyan, G.G., Grigoryan, A.A.: Sov. J. Nucl. Phys.34, 745(1981)Google Scholar
  14. 14.
    Thomas, A.W., Théberge, S., Miller, G.A.: Phys. Rev. D24, 216 (1981); Théberge, S., Miller, G.A., Thomas, A.W.: Can. J. Phys.60, 59 (1982)Google Scholar
  15. 15.
    Zoller, V.R.: Z. Phys. C60, 141 (1993)Google Scholar
  16. 16.
    Drell, S.D., Yan, T.-M.: Phys. Rev. Lett.24, 181 (1970)Google Scholar
  17. 17.
    Drell, S.D., Levy, D.J., Yan, T.-M.: Phys. Rev. D1, 1035 (1970)Google Scholar
  18. 18.
    Terent'ev, M.V.: Sov. J. Nucl. Phys.24, 106 (1976); Berestetskii, V.B., Terent'ev, M.V.: ibid.24, 547 (1976);25, 347 (1977)Google Scholar
  19. 19.
    Stoler, P.: Phys. Rev. Lett.66, 1003 (1991); Stoler, P.: Phys. Rev. D44,73(1991)Google Scholar
  20. 20.
    Gari, M., Krümpelmann, W.: Z. Phys. A322, 689 (1985)Google Scholar

Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • N. N. Nikolaev
    • 1
    • 2
  • A. Szczurek
    • 1
    • 3
  • J. Speth
    • 1
  • V. R. Zoller
    • 4
  1. 1.IKP (Theorie)Forschungszentrum Jülich GmbHJülichGermany
  2. 2.L.D. Landau Institute for Theoretical Physcis, GSP-1MoscowRussia
  3. 3.Institute of Nuclear PhysicsKrakowPoland
  4. 4.Institute for Theoretical and Experimental PhysicsMoscowRussia

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