Skip to main content
SpringerLink
Log in

A crisis in the parton model: where, oh where is the proton's spin?

  • Published:
Zeitschrift für Physik C Particles and Fields

Abstract

A careful re-analysis of the recent EMC polarized target experiment is carried out in the hope of avoiding the startling conclusion that only 1/8 of the proton's spin is due to the spin of its valence quards. Inconsistencies in the original analysis are corrected and the role ofg 2(x) and of possible vector diquark constituents is examined. A new result forg 2(x) in the parton model is presented.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. J. Ashman et al.: Phys. Lett. B206 (1988) 364; J.J. Aubert et al.: Nucl. Phys. B259 (1985) 189

    Google Scholar 

  2. J.D. Bjorken: Phys. Rev. 148 (1966) 1467; Phys. Rev. D1 (1971) 1376

    Google Scholar 

  3. J. Babcock, E. Monsay, D. Sivers: Phys. Rev. D19 (1979) 1483

    Google Scholar 

  4. A. Breakstone et al.: Z. Phys. C—Particles and Fields 28 (1985) 335

    Google Scholar 

  5. See for example: E. Leader, E. Predazzi: An introduction to gauge theories and the ‘new physics’: Chap. 12, Cambridge: Cambridge University Press 1985

    Google Scholar 

  6. M.J. Alguard et al.: Phys. Rev. Lett. 37 (1976) 1258

    Google Scholar 

  7. R.L. Heimann: Nucl. Phys. B64 (1973) 429

    Google Scholar 

  8. J. Ellis, R.L. Jaffe: Phys. Rev. D9 (1974) 1444, Erratum D10 (1974) 1669

    Google Scholar 

  9. R.P. Feynman: Photon-hadron interactions, Sect. 33. Reading, Mass.: Benjamin 1972

    Google Scholar 

  10. P.B. Renton: Proceedings of the X Workshop on High Energy Physics and Fields Theory, Protvino, USSR (1987)

  11. G. Altarelli, G. Parisi: Nucl. Phys. B126 (1977) 298

    Google Scholar 

  12. J. Kodaira: Nucl. Phys. B165 (1980) 129

    Google Scholar 

  13. In our normalization 〈P′∣P〉=(2π)32P 0δ3(P−P′)

  14. See, for example, —

    Google Scholar 

  15. M. Bourquin et al.: Z. Phys. C—Particles and Fields 21 (1983) 27

    Google Scholar 

  16. J. Ellis, R. Flores, S. Ritz: Phys. Lett. 198B (1987) 393; J. Ellis, R. Flores: CERN preprint TH.4911/87 (1987); M. Gluck, E. Reya: Dortmund preprint DO-TH 88/4 (1988)

    Google Scholar 

  17. J.P. Guillet: Marseille preprint CPT-87/P. 2037

  18. L. Galfi, J. Kuti, A. Patkos: Phys. Lett. 31B (1970) 465

    Google Scholar 

  19. A.J.G. Hey, J.E. Mandula: Phys. Rev. D5 (1972) 2610

    Google Scholar 

  20. See Ref. 9, — p. 157

    Google Scholar 

  21. For the general form of 246-2 see e.g. [5, Sect. 12.6] —

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Birkbeck College, University of London, London, UK

    E. Leader

  2. Dipartimento di Fisica Teorica, Università di Torino, I-10125, Torino, Italy

    M. Anselmino

Authors
  1. E. Leader
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. M. Anselmino
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Leader, E., Anselmino, M. A crisis in the parton model: where, oh where is the proton's spin?. Z. Phys. C - Particles and Fields 41, 239–246 (1988). https://doi.org/10.1007/BF01566922

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF01566922

Keywords

Search

Navigation