Weak Decays and the Bound State Structure of Hadrons

  • Harald Fritzsch
Part of the NATO Advanced Study Institutes Series book series (NSSB, volume 70)


During the last ten years we have witnessed the impressive success of the SU(2) × U(1) theory of the electromagnetic and weak interactions, or shortly the electroweak interactions. However at the same time it became clear that many of the unsolved problems in the physics of elementary particles will not find their solution within this theory. For example, it was thought years ago that within a well-defined theory of the electroweak interactions one will be able to calculate the mass spectrum of the leptons and quarks. Meanwhile we know that this is not the case. Instead we are confronted with a rather strange situation. The leptons and quarks turned out to come in families, which seem to be essentially copies of each other. All stable matter in the universe consists of the fermions contained in the first lepton- quark family:
$$\left( \begin{matrix} {{\nu }_{e}} u \\ {{e}^{-}} d \\ \end{matrix} \right)$$
. The second family, including the fermions
$$\left( \begin{matrix} {{v}_{\mu }} c \\ {{\mu }^{-}} s \\ \end{matrix} \right)$$
consists of objects which decay weakly into the fermions of the first generation (with the possible exception of v u).


Decay Mode Constituent Quark Lepton Pair Weak Decay Semileptonic Decay 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. 2.1
    For a recent review see: G. Trilling, in: Proceedings of the Int. Conf. on High Energy Physics, Madison, Wisconsin (1980).Google Scholar
  2. 2.2
    N. Cabibbo, G. Corbo and L. Maiani, Nucl. Phys. B155 (1979) 93;CrossRefGoogle Scholar
  3. A. Ali and E. Pietarinen, Nucl. Phys. B154 (1979) 519.CrossRefGoogle Scholar
  4. 2.3
    See e.g.: B. Wiik and G. Wolf, Springer Tracts in Modern Physics, Vol. 86 (1979).Google Scholar
  5. 2.4
    H. Fritzsch and P. Minkowski, Phys. Lett. 90B (1980) 455.CrossRefGoogle Scholar
  6. 2.5
    H. Fritzsch and P. Minkowski, Nucl. Phys. B171(1980) 413.CrossRefGoogle Scholar
  7. 2.6
    G. Altarelli and L. Maiani, Phys. Lett. 52B1974) 35;Google Scholar
  8. M.K. Gaillard and B.W. Lee, Phys. Rev. Lett. 33(1974) 108.CrossRefGoogle Scholar
  9. 2.7
    N. Cabibbo and L. Maiani, Phys. Lett. 52B(1974) 351.CrossRefGoogle Scholar
  10. 2.8
    M. Bander, D. Silverman and A. Soni, Phys. Rev. Lett. 44(1979) 7.CrossRefGoogle Scholar
  11. 2.9
    W. Bernreuther, O. Nachtmann and B. Stech, Z. f. Physik 44(1980) 257.Google Scholar
  12. 2.10
    V. Barger, J.P. Leveille and P.M. Stevenson, Phys. Rev. Lett. 44(1980) 226.CrossRefGoogle Scholar
  13. 3.1
    H. Fritzsch and P. Minkowski, Nuovo Cim. 30A (1975) 393.CrossRefGoogle Scholar
  14. 3.
    See e.g.: G. Farrar, Caltech preprint CALT-68–7o8 (1979), unpublished.Google Scholar
  15. 3.3
    G.S. Abrams et al., Phys. Rev. Lett. 431979) 812.CrossRefGoogle Scholar
  16. 4.1
    See e.g.: B. Wiik, Proceedings of the Ìnt. Conf. on High Energy Physics, Madison, Wisconsin (1980).Google Scholar
  17. 4.2
    D. Cutts et al., Phys. Rev. Lett. 41 (1978) 363;CrossRefGoogle Scholar
  18. R. Vidal et al., Phys. Lett. 77B (1978) 344.CrossRefGoogle Scholar
  19. 4.3
    M. Kobayashi and K. Maskawa, Progr. Theor. Phys. 49 (1973) 652.CrossRefGoogle Scholar
  20. 4.4
    M. Gaillard and B.W. Lee, Phys. Rev. D10 (1974) 897.Google Scholar
  21. 4.5
    R. Shrock, S. Treiman and L. Wang, Phys. Rev. Lett. 42 (1979) 1589.Google Scholar
  22. 4.6
    H. Fritzsch, Phys. Lett. 86B (1979) 164;CrossRefGoogle Scholar
  23. M.B. Wise, Phys. Lett. 89B (1980) 229;CrossRefGoogle Scholar
  24. J. Kühn et al., Z. f. Physik 5 (1980) 117;Google Scholar
  25. T. de Grand and T. Toussaint, Phys. Lett. 89B (1980) 256.CrossRefGoogle Scholar
  26. 4.
    V. Barger, J. Leveille, P. Stevenson, and R. Phillips, University of Wisconsin preprint COO - 881–129, unpublished.Google Scholar
  27. 4.8
    See e.g.: A. A.i et al., Z. f. Physik C1 (1979) 203.Google Scholar
  28. 4.9
    A. Ali, Z. f. Physik C1 (1979) 25;Google Scholar
  29. N. Cabibbo and L. Maiani, CERN preprint TH 2726 (1979), unpublished.Google Scholar

Copyright information

© Plenum Press, New York 1981

Authors and Affiliations

  • Harald Fritzsch
    • 1
  1. 1.Department of Physics University of MunichMax-Planck-Institute of PhysicsMunichGermany

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