Abstract
Among the many different ideas that were proposed to explain the narrow width of the high-mass states ψ(3095) and ψ′(3684) the simplest and most popular one is based on the quark model: In addition to the three “old” light quarks, u, d, s (collectively denoted as q) there is a “new” heavy quark Q carrying a new quantum number, that is to be conserved in strong and electromagnetic interactions. Consequently one expects three types of mesons,
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a.
Ordinary (qq̄) states,
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b.
High-mass (QQ̄) states,
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c.
New (qQ̄) and (q̄Q) states.
Work supported by the Energy Research and Development Administration.
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© 1977 Friedr. Vieweg & Sohn Verlagsgesellschaft mbH, Braunschweig
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Lüth, V. (1977). Observation of New Particles in e+e- Annihilation at SPEAR. In: Faissner, H., Reithler, H., Zerwas, P. (eds) Proceedings of the International Neutrino Conference Aachen 1976. Vieweg+Teubner Verlag. https://doi.org/10.1007/978-3-322-90614-4_21
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DOI: https://doi.org/10.1007/978-3-322-90614-4_21
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