Abstract
In this written version of my lectures, which are in a way a continuation of my lectures at Erice in 1977, I shall not repeat the general description of the situation of “quarkonia”, the J/ψ family, or the Υ family. Figure 1 summarizes the present knowledge of the J/ψ spectrum. The most noticeable improvement is the disappearance of the state at 2.83 GeV, decaying mostly into 2γ, and its replacement by a state X at 2.97 GeV, observed in ψ′ → γ + X and J/ψ → γ + X, decaying mostly into hadrons. For theorists this is a relief, because it was difficult to understand the large energy gap between 2.83 and the J/ψ, the too low transition rate observed, and the dominance of the γγ decay mode. On the other hand, as I said during my lectures, it would have been a catastrophe if a candidate for the 0−+ brother of the J/ψ had not been observed.
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References
H. Grosse and A. Martin, Preprint CERN TH. 2674 (1979), to appear in Phys. Reports.
A. Martin, “Ettore Majorana” International School of Subnuclear Physics, 15th Course: The Whys of Subnuclear Physics (ed. A. Zichichi) (Plenum Press, New York and London, 1979), p. 395.
C. Quigg and J. Rosner, Phys. Reports 56, 167 (1979).
C. Quigg and J. Rosner, communication to the EPS Int. Conf. on High-Energy Physics, Geneva, 1979.
H. Schopper, “Ettore Majorana” International School of Subnuclear Physics, 15th Course: The Whys of Subnuclear Physics (ed. A. Zichichi) (Plenum Press, New York and London, 1979), p. 203.
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© 1982 Plenum Press, New York
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Martin, A. (1982). Exact Results in the Theory of New Particles. In: Zichichi, A. (eds) Pointlike Structures Inside and Outside Hadrons. The Subnuclear Series, vol 17. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-1065-5_5
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DOI: https://doi.org/10.1007/978-1-4684-1065-5_5
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