Semi-Leptonic Interactions of Hadrons

  • Walter Greiner
  • Berndt Müller


All strongly interacting particles are called hadrons. One distinguishes baryons baryon number B = ±1, which are fermions and carry spin \(\tfrac{1}{2},\tfrac{3}{2}\),..., and mesons baryon number B = 0, which always have integer spin. The lightest hadrons, with equal spin (and equal parity), can be arranged in simple multiplets, where two further quantum numbers serve as order criteria: the isospin I, and its third component I3, and the strangeness S, or alternatively the so-called strong hypercharge Y = B + S. These quantum numbers are characterized by the fact that they are exactly conserved under strong interactions. Conservation of strangeness is broken by weak interactions, which leads to decays of, for example, the particle. The most important multiplets1 are depicted in Figs. 6.1–4.


Weak Interaction Neutrino Oscillation Neutral Current Pion Decay Electron Neutrino 
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Biographical Notes

  1. GELL-MANN, Murray, physicist, *15.9.1929 in New York, professor at the California Institute of Technology in Pasadena. He worked on the theory of elementary particles, especially on form factors, symmetry groups and Regge poles. At the same time as Y. Ne’eman, G.-M. developed the eight-fold way model of baryons and mesons. For this work he received the Nobel Prize in 1969.Google Scholar
  2. CABIBBO, Nicola, theroretical physicist, *30.4.1935 in Rome, since 1965 professor of Theoretical Physics at the University of Rome in Italy, president of the Institutio Nazionale di Fisica Nucleare. He mainly worked in theoretical elementary particle physics. In 1963 he was the first to formulate the universality of the weak interaction in terms of the mixing between strangeness-changing and strangeness-preserving processes (the Cabibbo mixing-angle).Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1993

Authors and Affiliations

  • Walter Greiner
    • 1
    • 2
  • Berndt Müller
    • 3
  1. 1.Institut für Theoretische PhysikJohann Wolfgang Geothe-Universität FrankfurtFrankfurt am MainGermany
  2. 2.Frankfurt am MainGermany
  3. 3.Physics DepartmentDuke UniversityDurhamUSA

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