Consequences of the Heavy Quark Symmetry for Semileptonic Decays of Heavy Baryons

  • P. Kroll


The properties of QCD in the infinite quark mass limit are currently the subject of intense study. It has been shown (Isgur and Wise, 1989, 1990, 1991) that in the formal limit of infinitely large momenta and masses of the heavy quarks, where the momentum-mass ratios, i.e. the velocities, are kept fixed, a new spin-flavour symmetry emerges. In fact it is a SU(2) S SU(2) F symmetry if we restrict ourselves to c and b quarks. This symmetry is termed the heavy quark symmetry (HQS). Like the usual SU(3) flavour symmetry of the three light quarks the HQS has a lot of phenomenological consequences. For example, it leads to relations between the form factors of weak decay processes such as or determines ratios of heavy hadron cross sections. It has also been realized that the HQS leads to a precise determination of the Kobayashi-Maskawa matrix element V bc . No crucial experimental test of the heavy quark symmetry exists as yet. In the near future, however, sufficient data will have been accumulated (ARGUS, CLEO, LEP) in order to examine the symmetry propositions.


Form Factor Heavy Quark Asymmetry Parameter Transition Form Factor Heavy Baryon 
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  1. ALEPH collaboration, Decamp, D. et al., 1992, Phys. Lett. B278:209.Google Scholar
  2. ARGUS collaboration, Albrecht, H. et al., 1991, DESY preprint DESY 91–091.Google Scholar
  3. ARGUS collaboration, Albrecht, H. et al., 1992, Phys. Lett. B274:239.Google Scholar
  4. Boyd, C.G. and Brahm, D.E., 1991, Phys. Lett. B254: 468.Google Scholar
  5. Avery, P. et al., 1990, Phys. Rev. Lett. 65: 2842.ADSCrossRefGoogle Scholar
  6. Eichten, E. and Hill, B., 1990, Phys. Lett. B234: 511.Google Scholar
  7. Falk, A., Georgi, H., Grinstein, B. and Wise, M.B., 1990, Nucl. Phys. B343: 1.ADSCrossRefGoogle Scholar
  8. Georgi, H., 1990, Phys. Lett. B240: 447.Google Scholar
  9. Georgi, H., Grinstein, B. and Wise, M.B., 1990, Phys. Lett. B252: 456.Google Scholar
  10. Grinstein, B., 1990, Nucl. Phys. B339: 253.MathSciNetADSCrossRefGoogle Scholar
  11. Guo, X.-H. and Kroll, P., 1992, Wuppertal preprint WU B 92–07.Google Scholar
  12. Hussain, F., Körner, J.G., Schilcher, K., Thompson, G. and Wu, Y.L., 1990, Phys. Lett. B249: 295.Google Scholar
  13. Isgur, N., 1991, Phys. Rev. D43: 810.ADSGoogle Scholar
  14. Isgur, N. and Wise, M., 1989, Phys. Lett. B232: 113.Google Scholar
  15. Isgur, N. and Wise, M., 1990, Phys. Lett. B237: 527.Google Scholar
  16. Isgur, N. and Wise, M., 1991, Nucl. Phys. B348: 276.ADSCrossRefGoogle Scholar
  17. König, B., Körner, J.G., Krämer, M. and Kroll, P., 1992, Mainz preprint MZ-TH/92–41Google Scholar
  18. Körner, J.G. and Krämer, M., 1992, Phys. Lett. B275: 495.Google Scholar
  19. Körner, J.G. and Kroll, P., 1992, Preprint DESY 92–019, to be published in Z. Phys. C. Phys. Lett. B293: 201.Google Scholar
  20. Körner, J.G. and Thompson, G., 1991, Phys. Lett. B264: 185.Google Scholar
  21. Kroll, P., 1991, Acta Phys. Pol. B22: 1079.Google Scholar
  22. Lepage, G.P. and Brodsky, S.J., 1980, Phys. Rev. D22: 2157.ADSGoogle Scholar
  23. Luke, M.E., 1990, Phys. Lett. B252: 447.Google Scholar
  24. Manuel, T., Roberts, W. and Ryzak, Z., 1991, Nucl. Phys. B355: 38ADSCrossRefGoogle Scholar
  25. Neubert, M., 1991, Phys. Lett. B264: 455.Google Scholar
  26. Neubert, M., 1992, Nucl. Phys. B317: 149.ADSCrossRefGoogle Scholar
  27. Neubert, M. and Rieckert, V., 1992, Nucl. Phys. B382: 97.ADSCrossRefGoogle Scholar
  28. Radyuskin, A.V., 1991, Phys. Lett. B271: 218.Google Scholar
  29. Roberts, W., 1992, Phys. Lett. B282: 453Google Scholar
  30. Sawicki, M., 1992, Phys. Rev. D46: 474.ADSGoogle Scholar
  31. Wirbel, M., Stech, B. and Bauer, M., 1985, Z.Phys. C29: 637.Google Scholar

Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • P. Kroll
    • 1
  1. 1.Fachbereich PhysikUniversität WuppertalWuppertal 1Germany

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