Experimental Determination of the Kobayashi-Maskawa Matrix Elements

  • K. R. Schubert
Conference paper

Abstract

In the standard elektroweak theory, the charged current is given by
$$ {J_{\lambda }} = \left( {{{\bar{\nu }}_e}\,{{\bar{\nu }}_{\mu }}\,{{\bar{\nu }}_r}} \right){\gamma_{\lambda }}\left( {1 - {\gamma_s}} \right)1\left( {\begin{array}{*{20}{c}} e \\ \mu \\ \tau \\ \end{array} } \right) + \left( {\bar{u}\,\bar{c}\,\bar{t}} \right){\gamma_{\lambda }}\left( {1 - {\gamma_s}} \right)v\left( {\begin{array}{*{20}{c}} d \\ s \\ b \\ \end{array} } \right) + h.c. $$
and describes the couplings of the charged vector bosons W ± to the lefthanded leptons and quarks. The unit matrix 1 in the lepton part reflects our present knowledge that emission of a W - by an electron always leads to an electron neutrino, never to a μ or τ neutrino, and that muons and τ-leptons obey the corresponding rule. In the quark sector the rules are different, emission of a W - by a d quark may may result in any of the three charge 2/3 quarks u, c, or t, and the same holds for the s and the b quark. The coupling strengths are however strictly connected to each other, the standard theory requires V to be a unitary matrix.

Keywords

Half Life 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    M.Kobayashi and T.Maskawa, Progr.Theor.Phys. 49(1973)652Google Scholar
  2. 2.
    S.W.Herb et al, Phys.Rev.Lett. 39(1977)252MathSciNetADSCrossRefGoogle Scholar
  3. 3.
    I.S.Towner and J.C.Hardy, Proc. 7th Int. Conf. on Atomic Masses and Fundamental Constants, Darmstadt 1984, ed. by O. Klepper, p.564, and references thereinGoogle Scholar
  4. 4.
    Review of Particle Properties by the Particle Data Group, Phys.Lett. 170B(1986)1, and original references thereinGoogle Scholar
  5. 5.
    W.J.Marciano and A.Sirlin, Phys.Rev.Lett. 56(1986)22ADSCrossRefGoogle Scholar
  6. 6.
    W.K.MacFarlane et al, Phys.Rev. D32(1985)547ADSGoogle Scholar
  7. 7.
    M.Bourquin et al (WA2), Z.Physik C21(1983)27ADSGoogle Scholar
  8. 8.
    H.Leutwyler and M.Roos, Z.Physik C25(1984)91ADSGoogle Scholar
  9. 9.
    H.Abramovicz et al (CDHS), Z.Physik C15(1982)19ADSGoogle Scholar
  10. 10.
    following a procedure given by K. Kleinknecht and B. Renk in “A New Analysis of Weak Mixing Angles between three or four Quark Generations”, Proc.Int.Symp. on Production and Decay of Heavy Hadrons, Heidelberg 1986Google Scholar
  11. 11.
    N.Ushida et al (E531), Phys.Rev.Lett. 56(1986) 1767 and 1771ADSCrossRefGoogle Scholar
  12. 12.
    D.Hitlin (MARK-III), presented at the Int. Symposium on Production and Decay of Heavy Hadrons, Heidelberg 1986Google Scholar
  13. 13.
    M.Witherell (E691, TPS), presented at the Int. Symposium on Production and Decay of Heavy Hadrons, Heidelberg 1986Google Scholar
  14. 14.
    V.Lüth, presented at the Int. Symposium on Production and Decay of Heavy Hadrons, Heidelberg 1986Google Scholar
  15. 15.
    T.M.Aliev et al, Yad.Fiz. 40(1984)823.Google Scholar
  16. 15a.
    T.M.Aliev et al, Sov.J.Nucl.Phys. 40(1984)527Google Scholar
  17. 16.
    M.Wirbel, B.Stech, and M.Bauer, Z.Physik C29(1985)637ADSGoogle Scholar
  18. 17.
    A.Chen et al (CLEO), Phys.Rev.Lett. 52(1984)1084ADSCrossRefGoogle Scholar
  19. 17a.
    C.Klopfenstein et al (CUSB), Phys.Lett. 130B(1983)444ADSGoogle Scholar
  20. 17b.
    G.Levman et al (CUSB), Phys.Lett. 141B(1984)271ADSGoogle Scholar
  21. 17c.
    S.Weseler (ARGUS), presented at the Int. Symposium on Production and Decay of Heavy Hadrons, Heidelberg 1986Google Scholar
  22. 18.
    J.P.Albanese et al (WA75), Phys.Lett. 158B(1985)186ADSGoogle Scholar
  23. 19.
    Unpublished. I thank my colleagues in the ARGUS collaboration, especially S.Weseler, for their permission to present this result.Google Scholar
  24. 20.
    C.Klopfenstein et al (CUSB), Phys.Lett. 130B(1983)444ADSGoogle Scholar
  25. 20a.
    A.Chen et al (CLEO), Phys.Rev.Lett. 52(1984)1084ADSCrossRefGoogle Scholar
  26. 21.
    B.Stech, Proc. Europhysics Topical Conference on Flavor Mixing in Weak Interactions, Erice 1984, ed. by L.-L. Chau, p.735Google Scholar
  27. 22.
    L.-L.Chau and W.-Y.Keung, Phys.Rev.Lett. 53(1984)1802ADSCrossRefGoogle Scholar
  28. 23.
    L.Maiani, Proc.Int.Symp. on Lepton and Photon Interactions at High Energies, Hamburg 1977, p.867Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1986

Authors and Affiliations

  • K. R. Schubert
    • 1
  1. 1.Institut für HochenergiephysikUniversität HeidelbergHeidelbergF. R. Germany

Personalised recommendations