Export citation

Export citation

Choose format for download:

Download Citation
  • Access by Xinjiang University

Unconfined quarks and gluons

A. De Rújula

R. C. Giles and R. L. Jaffe

  • The Physics Laboratories, Harvard University, Cambridge, Massachusetts 02138

  • Center for Theoretical Physics, Department of Physics and Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

Phys. Rev. D 17, 285 – Published 1 January, 1978

DOI: https://doi.org/10.1103/PhysRevD.17.285

Abstract

We explore the possibility that fractionally charged colored quarks and electrically neutral colored gluons may exist as real particles. Our framework is a renormalizable, spontaneously broken version of color dynamics [quantum chromodynamics (QCD)], in which the gluons are given a common mass μ in the Lagrangian. Color SU(3) remains an exact global symmetry, and for small μ our understanding of color-singlet hadrons in QCD is unaltered. For small μ the masses of physical quarks and gluons are large: O((2παμ)1) with α the slope of Regge trajectories. There is at least one stable hadron for every representation of color SU(3). In the unbroken QCD limit (μ0) the conventional picture of color confinement is recovered. To implement quasiconfinement in detail we use the MIT bag model. For μ=0 this model describes confinement. For μ0 it describes quasiconfinement with no further modification. Production cross sections for quarks and gluons turn out to be very small. Quark-nucleon and gluon-nucleon cross sections, on the other hand, are very large. Quarks and gluons have a large nuclear appetite: Sequential absorption of nucleons by a free quark is exothermic up to large values of total baryon number. If quarks are very heavy, primordial quarks left over from the big bang will be found in superheavy quark-nucleon complexes with large nonintegral charge and baryon number. Primordial gluons will have the appearance of integrally charged superheavy nucleon complexes.

Comments & Replies

Comment on unconfined quarks and gluons

Howard Georgi
Phys. Rev. D 22, 225 (1980)

References (27)

  1. L. W. Jones, Rev. Mod. Phys. 49, 717 (1977) G. Morpurgo, Physics (N.Y.) 2, 95 (1965)
  2. G. S. LaRue, W. M. Fairbank, and A. F. Hebard, Phys. Rev. Lett. 38, 1011 (1977)
  3. A. Salam, report presented at the XVIII International Conference on High Energy Physics, Tbilisi, USSR, 1976 (unpublished)
  4. A. Chodos, R. L. Jaffe, K. Johnson, C. B. Thorn, and V. F. Weisskopf, Phys. Rev. D 9, 3471 (1974)
  5. W. A. Bardeen, M. Chanowitz, S. D. Drell, M. Weinstein, and T.-M. Yan, Phys. Rev. D 11, 1094 (1975)
  6. T. DeGrand, R. L. Jaffe, K. Johnson, and J. Kiskis, Phys. Rev. D 12, 2060 (1975)
  7. A. De Rújula, H. Georgi, and S. L. Glashow, Phys. Rev. D 12, 147 (1975)
  8. L. Susskind, Loeb Lectures at Harvard University, 1977 (unpublished)
  9. Omitted endnote

  10. K. Bardacki and M. B. Halpern, Phys. Rev. D 6, 696 (1972) R. Mohapatra, J. Pati, and A. Salam, ibid. 12, 1733 (1976)
  11. S. Coleman and E. Weinberg, Phys. Rev. D 7, 1888 (1973)
  12. H. D. Politzer, Phys. Rev. Lett. 30, 1346 (1973) D. J. Gross and F. Wilczek, ibid. 30, 1343 (1976)
  13. A. De Rújula, H. Georgi, and H. D. Politzer, Ann. Phys. (N.Y.) 103, 315 (1977)
  14. H. D. Politzer and G. G. Ross, Nucl. Phys. B75, 269 (1974)
  15. T. W. Appelquist and J. Carrazone, Phys. Rev. D 11, 2865 (1975)
  16. N. P. Chang, Phys. Rev. D 10, 2706 (1974)
  17. A. Chodos, R. L. Jaffe, K. Johnson, and C. B. Thorn, Phys. Rev. D 10, 2599 (1974)
  18. K. Johnson and C. B. Thorn, Phys. Rev. D 13, 1934 (1976)
  19. A. Nir, Phys. Rev. Lett. 19, 336 (1967) H. J. Lipkin, in the Proceedings of the 1967 Heidelberg Conference on High Energy Physics (unpublished) M. J. Longo, Univ. of Michigan Report No. UM HE 77-3, 1977 (unpublished)
  20. Omitted endnote

  21. B. A. Freedman and L. D. McLerran, MIT Reports Nos. MIT-CTP-541, 547, 576, 582, and 602 (unpublished) V. Baluni, MIT Report No. 591 (unpublished)
  22. [6]
  23. S. J. Brodsky and G. R. Farrar, Phys. Rev. Lett. 31, 1153 (1973) V. Matveev, R. Muradyan, and A. Tavkhelidze, Lett. Nuovo Cimento 7, 719 (1973)
  24. S. D. Drell and T.-M. Yan, Phys. Rev. Lett. 25, 316 (1970)
  25. T. Nash, T. Yamagouchi, D. Nease, and J. Sculli, Phys. Rev. Lett. 32, 858 (1974)
  26. D. M. Schramm and R. V. Wagoner, Annu. Rev. Nucl. Sci. (to be published)
  27. Omitted endnote

Outline

Information

Sign In to Your Journals Account

Filter

Filter

Article Lookup

Enter a citation